Merge branch 'master' into encrypted-export

20 files changed, 548 insertions, 627 deletions

diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/operations/KeybaseVerificationOperation.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/operations/KeybaseVerificationOperation.java
index aaff0a07c..f3ceac681 100644
--- a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/operations/KeybaseVerificationOperation.java
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/operations/KeybaseVerificationOperation.java
@@ -151,7 +151,6 @@ public class KeybaseVerificationOperation extends BaseOperation<KeybaseVerificat
             PgpDecryptVerifyOperation op = new PgpDecryptVerifyOperation(mContext, mProviderHelper, mProgressable);
 
             PgpDecryptVerifyInputParcel input = new PgpDecryptVerifyInputParcel(messageBytes)
-                    .setSignedLiteralData(true)
                     .setRequiredSignerFingerprint(requiredFingerprint);
 
             DecryptVerifyResult decryptVerifyResult = op.execute(input, new CryptoInputParcel());
diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/operations/results/OperationResult.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/operations/results/OperationResult.java
index fc72a9ac2..24d1215d4 100644
--- a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/operations/results/OperationResult.java
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/operations/results/OperationResult.java
@@ -514,7 +514,7 @@ public abstract class OperationResult implements Parcelable {
         MSG_CR_ERROR_NO_USER_ID (LogLevel.ERROR, R.string.msg_cr_error_no_user_id),
         MSG_CR_ERROR_NO_CERTIFY (LogLevel.ERROR, R.string.msg_cr_error_no_certify),
         MSG_CR_ERROR_NULL_EXPIRY(LogLevel.ERROR, R.string.msg_cr_error_null_expiry),
-        MSG_CR_ERROR_KEYSIZE_512 (LogLevel.ERROR, R.string.msg_cr_error_keysize_512),
+        MSG_CR_ERROR_KEYSIZE_2048(LogLevel.ERROR, R.string.msg_cr_error_keysize_2048),
         MSG_CR_ERROR_NO_KEYSIZE (LogLevel.ERROR, R.string.msg_cr_error_no_keysize),
         MSG_CR_ERROR_NO_CURVE (LogLevel.ERROR, R.string.msg_cr_error_no_curve),
         MSG_CR_ERROR_UNKNOWN_ALGO (LogLevel.ERROR, R.string.msg_cr_error_unknown_algo),
@@ -661,6 +661,7 @@ public abstract class OperationResult implements Parcelable {
         MSG_DC_ERROR_INPUT (LogLevel.ERROR, R.string.msg_dc_error_input),
         MSG_DC_ERROR_NO_DATA (LogLevel.ERROR, R.string.msg_dc_error_no_data),
         MSG_DC_ERROR_NO_KEY (LogLevel.ERROR, R.string.msg_dc_error_no_key),
+        MSG_DC_ERROR_NO_SIGNATURE (LogLevel.ERROR, R.string.msg_dc_error_no_signature),
         MSG_DC_ERROR_PGP_EXCEPTION (LogLevel.ERROR, R.string.msg_dc_error_pgp_exception),
         MSG_DC_INTEGRITY_CHECK_OK (LogLevel.INFO, R.string.msg_dc_integrity_check_ok),
         MSG_DC_OK_META_ONLY (LogLevel.OK, R.string.msg_dc_ok_meta_only),
@@ -687,6 +688,7 @@ public abstract class OperationResult implements Parcelable {
         MSG_VL_ERROR_MISSING_SIGLIST (LogLevel.ERROR, R.string.msg_vl_error_no_siglist),
         MSG_VL_ERROR_MISSING_LITERAL (LogLevel.ERROR, R.string.msg_vl_error_missing_literal),
         MSG_VL_ERROR_MISSING_KEY (LogLevel.ERROR, R.string.msg_vl_error_wrong_key),
+        MSG_VL_ERROR_NO_SIGNATURE (LogLevel.ERROR, R.string.msg_vl_error_no_signature),
         MSG_VL_CLEAR_SIGNATURE_CHECK (LogLevel.DEBUG, R.string.msg_vl_clear_signature_check),
         MSG_VL_ERROR_INTEGRITY_CHECK (LogLevel.ERROR, R.string.msg_vl_error_integrity_check),
         MSG_VL_OK (LogLevel.OK, R.string.msg_vl_ok),
@@ -703,7 +705,6 @@ public abstract class OperationResult implements Parcelable {
 
         // pgpsignencrypt
         MSG_PSE_ASYMMETRIC (LogLevel.INFO, R.string.msg_pse_asymmetric),
-        MSG_PSE_CLEARSIGN_ONLY (LogLevel.DEBUG, R.string.msg_pse_clearsign_only),
         MSG_PSE_COMPRESSING (LogLevel.DEBUG, R.string.msg_pse_compressing),
         MSG_PSE_ENCRYPTING (LogLevel.DEBUG, R.string.msg_pse_encrypting),
         MSG_PSE_ERROR_BAD_PASSPHRASE (LogLevel.ERROR, R.string.msg_pse_error_bad_passphrase),
diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/CanonicalizedKeyRing.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/CanonicalizedKeyRing.java
index 18a27dd96..6f1e78ce6 100644
--- a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/CanonicalizedKeyRing.java
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/CanonicalizedKeyRing.java
@@ -154,8 +154,13 @@ public abstract class CanonicalizedKeyRing extends KeyRing {
         return getRing().getEncoded();
     }
 
-    public boolean containsSubkey(String expectedFingerprint) {
+    /// Returns true iff the keyring contains a primary key or mutually bound subkey with the expected fingerprint
+    public boolean containsBoundSubkey(String expectedFingerprint) {
         for (CanonicalizedPublicKey key : publicKeyIterator()) {
+            boolean isMasterOrMutuallyBound = key.isMasterKey() || key.canSign();
+            if (!isMasterOrMutuallyBound) {
+                continue;
+            }
             if (KeyFormattingUtils.convertFingerprintToHex(
                     key.getFingerprint()).equalsIgnoreCase(expectedFingerprint)) {
                 return true;
diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/CanonicalizedPublicKey.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/CanonicalizedPublicKey.java
index 412468a48..476b4e59c 100644
--- a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/CanonicalizedPublicKey.java
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/CanonicalizedPublicKey.java
@@ -44,13 +44,17 @@ import java.util.Iterator;
 public class CanonicalizedPublicKey extends UncachedPublicKey {
 
     // this is the parent key ring
-    final KeyRing mRing;
+    final CanonicalizedKeyRing mRing;
 
-    CanonicalizedPublicKey(KeyRing ring, PGPPublicKey key) {
+    CanonicalizedPublicKey(CanonicalizedKeyRing ring, PGPPublicKey key) {
         super(key);
         mRing = ring;
     }
 
+    public CanonicalizedKeyRing getKeyRing() {
+        return mRing;
+    }
+
     public IterableIterator<String> getUserIds() {
         return new IterableIterator<String>(mPublicKey.getUserIDs());
     }
diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/OpenPgpSignatureResultBuilder.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/OpenPgpSignatureResultBuilder.java
index 9d059b58f..2dd1e2dde 100644
--- a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/OpenPgpSignatureResultBuilder.java
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/OpenPgpSignatureResultBuilder.java
@@ -91,11 +91,12 @@ public class OpenPgpSignatureResultBuilder {
         return mInsecure;
     }
 
-    public void initValid(CanonicalizedPublicKeyRing signingRing,
-                          CanonicalizedPublicKey signingKey) {
+    public void initValid(CanonicalizedPublicKey signingKey) {
         setSignatureAvailable(true);
         setKnownKey(true);
 
+        CanonicalizedKeyRing signingRing = signingKey.getKeyRing();
+
         // from RING
         setKeyId(signingRing.getMasterKeyId());
         try {
diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/PgpDecryptVerifyInputParcel.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/PgpDecryptVerifyInputParcel.java
index 3eef7759c..bc9b54cd6 100644
--- a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/PgpDecryptVerifyInputParcel.java
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/PgpDecryptVerifyInputParcel.java
@@ -18,7 +18,7 @@
 
 package org.sufficientlysecure.keychain.pgp;
 
-import java.io.InputStream;
+
 import java.util.HashSet;
 
 import android.net.Uri;
@@ -36,7 +36,6 @@ public class PgpDecryptVerifyInputParcel implements Parcelable {
     private boolean mDecryptMetadataOnly;
     private byte[] mDetachedSignature;
     private String mRequiredSignerFingerprint;
-    private boolean mSignedLiteralData;
 
     public PgpDecryptVerifyInputParcel() {
     }
@@ -61,7 +60,6 @@ public class PgpDecryptVerifyInputParcel implements Parcelable {
         mDecryptMetadataOnly = source.readInt() != 0;
         mDetachedSignature = source.createByteArray();
         mRequiredSignerFingerprint = source.readString();
-        mSignedLiteralData = source.readInt() != 0;
     }
 
     @Override
@@ -80,7 +78,6 @@ public class PgpDecryptVerifyInputParcel implements Parcelable {
         dest.writeInt(mDecryptMetadataOnly ? 1 : 0);
         dest.writeByteArray(mDetachedSignature);
         dest.writeString(mRequiredSignerFingerprint);
-        dest.writeInt(mSignedLiteralData ? 1 : 0);
     }
 
     byte[] getInputBytes() {
@@ -150,15 +147,6 @@ public class PgpDecryptVerifyInputParcel implements Parcelable {
         return this;
     }
 
-    boolean isSignedLiteralData() {
-        return mSignedLiteralData;
-    }
-
-    public PgpDecryptVerifyInputParcel setSignedLiteralData(boolean signedLiteralData) {
-        mSignedLiteralData = signedLiteralData;
-        return this;
-    }
-
     public static final Creator<PgpDecryptVerifyInputParcel> CREATOR = new Creator<PgpDecryptVerifyInputParcel>() {
         public PgpDecryptVerifyInputParcel createFromParcel(final Parcel source) {
             return new PgpDecryptVerifyInputParcel(source);
diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/PgpDecryptVerifyOperation.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/PgpDecryptVerifyOperation.java
index 055f84b4d..2d28f70e0 100644
--- a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/PgpDecryptVerifyOperation.java
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/PgpDecryptVerifyOperation.java
@@ -18,13 +18,23 @@
 
 package org.sufficientlysecure.keychain.pgp;
 
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.security.SignatureException;
+import java.util.Date;
+import java.util.Iterator;
+
 import android.content.Context;
 import android.support.annotation.NonNull;
 import android.webkit.MimeTypeMap;
 
 import org.openintents.openpgp.OpenPgpDecryptionResult;
 import org.openintents.openpgp.OpenPgpMetadata;
-import org.openintents.openpgp.OpenPgpSignatureResult;
 import org.spongycastle.bcpg.ArmoredInputStream;
 import org.spongycastle.openpgp.PGPCompressedData;
 import org.spongycastle.openpgp.PGPDataValidationException;
@@ -33,18 +43,14 @@ import org.spongycastle.openpgp.PGPEncryptedDataList;
 import org.spongycastle.openpgp.PGPException;
 import org.spongycastle.openpgp.PGPKeyValidationException;
 import org.spongycastle.openpgp.PGPLiteralData;
-import org.spongycastle.openpgp.PGPOnePassSignature;
-import org.spongycastle.openpgp.PGPOnePassSignatureList;
 import org.spongycastle.openpgp.PGPPBEEncryptedData;
 import org.spongycastle.openpgp.PGPPublicKeyEncryptedData;
-import org.spongycastle.openpgp.PGPSignature;
 import org.spongycastle.openpgp.PGPSignatureList;
 import org.spongycastle.openpgp.PGPUtil;
 import org.spongycastle.openpgp.jcajce.JcaPGPObjectFactory;
 import org.spongycastle.openpgp.operator.PBEDataDecryptorFactory;
 import org.spongycastle.openpgp.operator.PGPDigestCalculatorProvider;
 import org.spongycastle.openpgp.operator.jcajce.CachingDataDecryptorFactory;
-import org.spongycastle.openpgp.operator.jcajce.JcaPGPContentVerifierBuilderProvider;
 import org.spongycastle.openpgp.operator.jcajce.JcaPGPDigestCalculatorProviderBuilder;
 import org.spongycastle.openpgp.operator.jcajce.JcePBEDataDecryptorFactoryBuilder;
 import org.spongycastle.util.encoders.DecoderException;
@@ -68,17 +74,6 @@ import org.sufficientlysecure.keychain.util.Log;
 import org.sufficientlysecure.keychain.util.Passphrase;
 import org.sufficientlysecure.keychain.util.ProgressScaler;
 
-import java.io.BufferedInputStream;
-import java.io.ByteArrayInputStream;
-import java.io.ByteArrayOutputStream;
-import java.io.FileNotFoundException;
-import java.io.IOException;
-import java.io.InputStream;
-import java.io.OutputStream;
-import java.security.SignatureException;
-import java.util.Date;
-import java.util.Iterator;
-
 public class PgpDecryptVerifyOperation extends BaseOperation<PgpDecryptVerifyInputParcel> {
 
     public PgpDecryptVerifyOperation(Context context, ProviderHelper providerHelper, Progressable progressable) {
@@ -153,9 +148,7 @@ public class PgpDecryptVerifyOperation extends BaseOperation<PgpDecryptVerifyInp
                     // it is ascii armored
                     Log.d(Constants.TAG, "ASCII Armor Header Line: " + aIn.getArmorHeaderLine());
 
-                    if (input.isSignedLiteralData()) {
-                        return verifySignedLiteralData(input, aIn, outputStream, 0);
-                    } else if (aIn.isClearText()) {
+                    if (aIn.isClearText()) {
                         // a cleartext signature, verify it with the other method
                         return verifyCleartextSignature(aIn, outputStream, 0);
                     } else {
@@ -186,133 +179,6 @@ public class PgpDecryptVerifyOperation extends BaseOperation<PgpDecryptVerifyInp
         }
     }
 
-    /**Verify signed plaintext data (PGP/INLINE). */
-    @NonNull
-    private DecryptVerifyResult verifySignedLiteralData(
-            PgpDecryptVerifyInputParcel input, InputStream in, OutputStream out, int indent)
-            throws IOException, PGPException {
-        OperationLog log = new OperationLog();
-        log.add(LogType.MSG_VL, indent);
-
-        // thinking that the proof-fetching operation is going to take most of the time
-        updateProgress(R.string.progress_reading_data, 75, 100);
-
-        JcaPGPObjectFactory pgpF = new JcaPGPObjectFactory(in);
-        Object o = pgpF.nextObject();
-        if (o instanceof PGPCompressedData) {
-            log.add(LogType.MSG_DC_CLEAR_DECOMPRESS, indent + 1);
-
-            pgpF = new JcaPGPObjectFactory(((PGPCompressedData) o).getDataStream());
-            o = pgpF.nextObject();
-            updateProgress(R.string.progress_decompressing_data, 80, 100);
-        }
-
-        // all we want to see is a OnePassSignatureList followed by LiteralData
-        if (!(o instanceof PGPOnePassSignatureList)) {
-            log.add(LogType.MSG_VL_ERROR_MISSING_SIGLIST, indent);
-            return new DecryptVerifyResult(DecryptVerifyResult.RESULT_ERROR, log);
-        }
-        PGPOnePassSignatureList sigList = (PGPOnePassSignatureList) o;
-
-        // go through all signatures (should be just one), make sure we have
-        //  the key and it matches the one we’re looking for
-        CanonicalizedPublicKeyRing signingRing = null;
-        CanonicalizedPublicKey signingKey = null;
-        int signatureIndex = -1;
-        for (int i = 0; i < sigList.size(); ++i) {
-            try {
-                long sigKeyId = sigList.get(i).getKeyID();
-                signingRing = mProviderHelper.getCanonicalizedPublicKeyRing(
-                        KeyRings.buildUnifiedKeyRingsFindBySubkeyUri(sigKeyId)
-                );
-                signingKey = signingRing.getPublicKey(sigKeyId);
-                signatureIndex = i;
-            } catch (ProviderHelper.NotFoundException e) {
-                Log.d(Constants.TAG, "key not found, trying next signature...");
-            }
-        }
-
-        // there has to be a key, and it has to be the right one
-        if (signingKey == null) {
-            log.add(LogType.MSG_VL_ERROR_MISSING_KEY, indent);
-            Log.d(Constants.TAG, "Failed to find key in signed-literal message");
-            return new DecryptVerifyResult(DecryptVerifyResult.RESULT_ERROR, log);
-        }
-
-        String fingerprint = KeyFormattingUtils.convertFingerprintToHex(signingRing.getFingerprint());
-        if (!(input.getRequiredSignerFingerprint().equals(fingerprint))) {
-            log.add(LogType.MSG_VL_ERROR_MISSING_KEY, indent);
-            Log.d(Constants.TAG, "Fingerprint mismatch; wanted " + input.getRequiredSignerFingerprint() +
-                    " got " + fingerprint + "!");
-            return new DecryptVerifyResult(DecryptVerifyResult.RESULT_ERROR, log);
-        }
-
-        OpenPgpSignatureResultBuilder signatureResultBuilder = new OpenPgpSignatureResultBuilder();
-
-        PGPOnePassSignature signature = sigList.get(signatureIndex);
-        signatureResultBuilder.initValid(signingRing, signingKey);
-
-        JcaPGPContentVerifierBuilderProvider contentVerifierBuilderProvider =
-                new JcaPGPContentVerifierBuilderProvider()
-                        .setProvider(Constants.BOUNCY_CASTLE_PROVIDER_NAME);
-        signature.init(contentVerifierBuilderProvider, signingKey.getPublicKey());
-
-        o = pgpF.nextObject();
-
-        if (!(o instanceof PGPLiteralData)) {
-            log.add(LogType.MSG_VL_ERROR_MISSING_LITERAL, indent);
-            return new DecryptVerifyResult(DecryptVerifyResult.RESULT_ERROR, log);
-        }
-
-        PGPLiteralData literalData = (PGPLiteralData) o;
-
-        log.add(LogType.MSG_DC_CLEAR_DATA, indent + 1);
-        updateProgress(R.string.progress_decrypting, 85, 100);
-
-        InputStream dataIn = literalData.getInputStream();
-
-        int length;
-        byte[] buffer = new byte[1 << 16];
-        while ((length = dataIn.read(buffer)) > 0) {
-            out.write(buffer, 0, length);
-            signature.update(buffer, 0, length);
-        }
-
-        updateProgress(R.string.progress_verifying_signature, 95, 100);
-        log.add(LogType.MSG_VL_CLEAR_SIGNATURE_CHECK, indent + 1);
-
-        PGPSignatureList signatureList = (PGPSignatureList) pgpF.nextObject();
-        PGPSignature messageSignature = signatureList.get(signatureIndex);
-
-        // Verify signature and check binding signatures
-        boolean validSignature = signature.verify(messageSignature);
-        if (validSignature) {
-            log.add(LogType.MSG_DC_CLEAR_SIGNATURE_OK, indent + 1);
-        } else {
-            log.add(LogType.MSG_DC_CLEAR_SIGNATURE_BAD, indent + 1);
-        }
-        signatureResultBuilder.setValidSignature(validSignature);
-
-        OpenPgpSignatureResult signatureResult = signatureResultBuilder.build();
-
-        if (signatureResult.getResult() != OpenPgpSignatureResult.RESULT_VALID_CONFIRMED
-                && signatureResult.getResult() != OpenPgpSignatureResult.RESULT_VALID_UNCONFIRMED) {
-            log.add(LogType.MSG_VL_ERROR_INTEGRITY_CHECK, indent);
-            return new DecryptVerifyResult(DecryptVerifyResult.RESULT_ERROR, log);
-        }
-
-        updateProgress(R.string.progress_done, 100, 100);
-
-        log.add(LogType.MSG_VL_OK, indent);
-
-        // Return a positive result, with metadata and verification info
-        DecryptVerifyResult result = new DecryptVerifyResult(DecryptVerifyResult.RESULT_OK, log);
-        result.setSignatureResult(signatureResult);
-        result.setDecryptionResult(
-                new OpenPgpDecryptionResult(OpenPgpDecryptionResult.RESULT_NOT_ENCRYPTED));
-        return result;
-    }
-
     private static class EncryptStreamResult {
 
         // this is non-null iff an error occured, return directly
@@ -368,7 +234,6 @@ public class PgpDecryptVerifyOperation extends BaseOperation<PgpDecryptVerifyInp
             }
         }
 
-        OpenPgpSignatureResultBuilder signatureResultBuilder = new OpenPgpSignatureResultBuilder();
         OpenPgpDecryptionResultBuilder decryptionResultBuilder = new OpenPgpDecryptionResultBuilder();
 
         JcaPGPObjectFactory plainFact;
@@ -415,10 +280,6 @@ public class PgpDecryptVerifyOperation extends BaseOperation<PgpDecryptVerifyInp
 
         log.add(LogType.MSG_DC_PREP_STREAMS, indent);
 
-        int signatureIndex = -1;
-        CanonicalizedPublicKeyRing signingRing = null;
-        CanonicalizedPublicKey signingKey = null;
-
         log.add(LogType.MSG_DC_CLEAR, indent);
         indent += 1;
 
@@ -435,58 +296,8 @@ public class PgpDecryptVerifyOperation extends BaseOperation<PgpDecryptVerifyInp
             plainFact = fact;
         }
 
-        // resolve leading signature data
-        PGPOnePassSignature signature = null;
-        if (dataChunk instanceof PGPOnePassSignatureList) {
-            log.add(LogType.MSG_DC_CLEAR_SIGNATURE, indent + 1);
-            currentProgress += 2;
-            updateProgress(R.string.progress_processing_signature, currentProgress, 100);
-
-            PGPOnePassSignatureList sigList = (PGPOnePassSignatureList) dataChunk;
-
-            // NOTE: following code is similar to processSignature, but for PGPOnePassSignature
-
-            // go through all signatures
-            // and find out for which signature we have a key in our database
-            for (int i = 0; i < sigList.size(); ++i) {
-                try {
-                    long sigKeyId = sigList.get(i).getKeyID();
-                    signingRing = mProviderHelper.getCanonicalizedPublicKeyRing(
-                            KeyRings.buildUnifiedKeyRingsFindBySubkeyUri(sigKeyId)
-                    );
-                    signingKey = signingRing.getPublicKey(sigKeyId);
-                    signatureIndex = i;
-                } catch (ProviderHelper.NotFoundException e) {
-                    Log.d(Constants.TAG, "key not found, trying next signature...");
-                }
-            }
-
-            if (signingKey != null) {
-                // key found in our database!
-                signature = sigList.get(signatureIndex);
-
-                signatureResultBuilder.initValid(signingRing, signingKey);
-
-                JcaPGPContentVerifierBuilderProvider contentVerifierBuilderProvider =
-                        new JcaPGPContentVerifierBuilderProvider()
-                                .setProvider(Constants.BOUNCY_CASTLE_PROVIDER_NAME);
-                signature.init(contentVerifierBuilderProvider, signingKey.getPublicKey());
-            } else {
-                // no key in our database -> return "unknown pub key" status including the first key id
-                if (!sigList.isEmpty()) {
-                    signatureResultBuilder.setSignatureAvailable(true);
-                    signatureResultBuilder.setKnownKey(false);
-                    signatureResultBuilder.setKeyId(sigList.get(0).getKeyID());
-                }
-            }
-
-            // check for insecure signing key
-            // TODO: checks on signingRing ?
-            if (signingKey != null && ! PgpSecurityConstants.isSecureKey(signingKey)) {
-                log.add(LogType.MSG_DC_INSECURE_KEY, indent + 1);
-                signatureResultBuilder.setInsecure(true);
-            }
-
+        PgpSignatureChecker signatureChecker = new PgpSignatureChecker(mProviderHelper);
+        if (signatureChecker.initializeOnePassSignature(dataChunk, log, indent +1)) {
             dataChunk = plainFact.nextObject();
         }
 
@@ -567,16 +378,8 @@ public class PgpDecryptVerifyOperation extends BaseOperation<PgpDecryptVerifyInp
             return result;
         }
 
-        int endProgress;
-        if (signature != null) {
-            endProgress = 90;
-        } else if (esResult != null && esResult.encryptedData.isIntegrityProtected()) {
-            endProgress = 95;
-        } else {
-            endProgress = 100;
-        }
         ProgressScaler progressScaler =
-                new ProgressScaler(mProgressable, currentProgress, endProgress, 100);
+                new ProgressScaler(mProgressable, currentProgress, 95, 100);
 
         InputStream dataIn = literalData.getInputStream();
 
@@ -592,9 +395,7 @@ public class PgpDecryptVerifyOperation extends BaseOperation<PgpDecryptVerifyInp
             }
 
             // update signature buffer if signature is also present
-            if (signature != null) {
-                signature.update(buffer, 0, length);
-            }
+            signatureChecker.updateSignatureData(buffer, 0, length);
 
             // note down first couple of bytes for "magic bytes" file type detection
             if (alreadyWritten == 0) {
@@ -602,7 +403,7 @@ public class PgpDecryptVerifyOperation extends BaseOperation<PgpDecryptVerifyInp
             }
 
             alreadyWritten += length;
-
+            // noinspection ConstantConditions, TODO progress
             if (wholeSize > 0) {
                 long progress = 100 * alreadyWritten / wholeSize;
                 // stop at 100% for wrong file sizes...
@@ -611,7 +412,6 @@ public class PgpDecryptVerifyOperation extends BaseOperation<PgpDecryptVerifyInp
                 }
                 progressScaler.setProgress((int) progress, 100);
             }
-            // TODO: slow annealing to fake a progress?
         }
 
         // special treatment to detect pgp mime types
@@ -628,28 +428,15 @@ public class PgpDecryptVerifyOperation extends BaseOperation<PgpDecryptVerifyInp
         metadata = new OpenPgpMetadata(
                 originalFilename, mimeType, literalData.getModificationTime().getTime(), alreadyWritten, charset);
 
-        if (signature != null) {
-            updateProgress(R.string.progress_verifying_signature, 90, 100);
-            log.add(LogType.MSG_DC_CLEAR_SIGNATURE_CHECK, indent);
-
-            PGPSignatureList signatureList = (PGPSignatureList) plainFact.nextObject();
-            PGPSignature messageSignature = signatureList.get(signatureIndex);
+        if (signatureChecker.isInitialized()) {
 
-            // Verify signature
-            boolean validSignature = signature.verify(messageSignature);
-            if (validSignature) {
-                log.add(LogType.MSG_DC_CLEAR_SIGNATURE_OK, indent + 1);
-            } else {
-                log.add(LogType.MSG_DC_CLEAR_SIGNATURE_BAD, indent + 1);
-            }
+            Object o = plainFact.nextObject();
+            boolean signatureCheckOk = signatureChecker.verifySignatureOnePass(o, log, indent + 1);
 
-            // check for insecure hash algorithms
-            if (!PgpSecurityConstants.isSecureHashAlgorithm(signature.getHashAlgorithm())) {
-                log.add(LogType.MSG_DC_INSECURE_HASH_ALGO, indent + 1);
-                signatureResultBuilder.setInsecure(true);
+            if (!signatureCheckOk) {
+                return new DecryptVerifyResult(DecryptVerifyResult.RESULT_ERROR, log);
             }
 
-            signatureResultBuilder.setValidSignature(validSignature);
         }
 
         indent -= 1;
@@ -664,7 +451,7 @@ public class PgpDecryptVerifyOperation extends BaseOperation<PgpDecryptVerifyInp
                     log.add(LogType.MSG_DC_ERROR_INTEGRITY_CHECK, indent);
                     return new DecryptVerifyResult(DecryptVerifyResult.RESULT_ERROR, log);
                 }
-            } else if (signature == null) {
+            } else if ( ! signatureChecker.isInitialized() ) {
                 // If no signature is present, we *require* an MDC!
                 // Handle missing integrity protection like failed integrity protection!
                 // The MDC packet can be stripped by an attacker!
@@ -681,7 +468,7 @@ public class PgpDecryptVerifyOperation extends BaseOperation<PgpDecryptVerifyInp
         DecryptVerifyResult result = new DecryptVerifyResult(DecryptVerifyResult.RESULT_OK, log);
 
         result.setCachedCryptoInputParcel(cryptoInput);
-        result.setSignatureResult(signatureResultBuilder.build());
+        result.setSignatureResult(signatureChecker.getSignatureResult());
         result.setDecryptionResult(decryptionResultBuilder.build());
         result.setDecryptionMetadata(metadata);
 
@@ -692,13 +479,6 @@ public class PgpDecryptVerifyOperation extends BaseOperation<PgpDecryptVerifyInp
     private EncryptStreamResult handleEncryptedPacket(PgpDecryptVerifyInputParcel input, CryptoInputParcel cryptoInput,
             PGPEncryptedDataList enc, OperationLog log, int indent, int currentProgress) throws PGPException {
 
-        // TODO is this necessary?
-        /*
-        else if (obj instanceof PGPEncryptedDataList) {
-            enc = (PGPEncryptedDataList) pgpF.nextObject();
-        }
-        */
-
         EncryptStreamResult result = new EncryptStreamResult();
 
         boolean asymmetricPacketFound = false;
@@ -739,11 +519,6 @@ public class PgpDecryptVerifyOperation extends BaseOperation<PgpDecryptVerifyInp
                     log.add(LogType.MSG_DC_ASKIP_NO_KEY, indent + 1);
                     continue;
                 }
-                if (secretKeyRing == null) {
-                    // continue with the next packet in the while loop
-                    log.add(LogType.MSG_DC_ASKIP_NO_KEY, indent + 1);
-                    continue;
-                }
 
                 // allow only specific keys for decryption?
                 if (input.getAllowedKeyIds() != null) {
@@ -763,11 +538,6 @@ public class PgpDecryptVerifyOperation extends BaseOperation<PgpDecryptVerifyInp
 
                 // get subkey which has been used for this encryption packet
                 secretEncryptionKey = secretKeyRing.getSecretKey(subKeyId);
-                if (secretEncryptionKey == null) {
-                    // should actually never happen, so no need to be more specific.
-                    log.add(LogType.MSG_DC_ASKIP_NO_KEY, indent + 1);
-                    continue;
-                }
 
                 /* secret key exists in database and is allowed! */
                 asymmetricPacketFound = true;
@@ -969,30 +739,31 @@ public class PgpDecryptVerifyOperation extends BaseOperation<PgpDecryptVerifyInp
 
         OperationLog log = new OperationLog();
 
-        OpenPgpSignatureResultBuilder signatureResultBuilder = new OpenPgpSignatureResultBuilder();
-
-        ByteArrayOutputStream out = new ByteArrayOutputStream();
+        byte[] clearText;
+        { // read cleartext
+            ByteArrayOutputStream out = new ByteArrayOutputStream();
 
-        updateProgress(R.string.progress_reading_data, 0, 100);
+            updateProgress(R.string.progress_reading_data, 0, 100);
 
-        ByteArrayOutputStream lineOut = new ByteArrayOutputStream();
-        int lookAhead = readInputLine(lineOut, aIn);
-        byte[] lineSep = getLineSeparator();
+            ByteArrayOutputStream lineOut = new ByteArrayOutputStream();
+            int lookAhead = readInputLine(lineOut, aIn);
+            byte[] lineSep = getLineSeparator();
 
-        byte[] line = lineOut.toByteArray();
-        out.write(line, 0, getLengthWithoutSeparator(line));
-        out.write(lineSep);
-
-        while (lookAhead != -1 && aIn.isClearText()) {
-            lookAhead = readInputLine(lineOut, lookAhead, aIn);
-            line = lineOut.toByteArray();
+            byte[] line = lineOut.toByteArray();
             out.write(line, 0, getLengthWithoutSeparator(line));
             out.write(lineSep);
-        }
 
-        out.close();
+            while (lookAhead != -1 && aIn.isClearText()) {
+                lookAhead = readInputLine(lineOut, lookAhead, aIn);
+                line = lineOut.toByteArray();
+                out.write(line, 0, getLengthWithoutSeparator(line));
+                out.write(lineSep);
+            }
+
+            out.close();
+            clearText = out.toByteArray();
+        }
 
-        byte[] clearText = out.toByteArray();
         if (outputStream != null) {
             outputStream.write(clearText);
             outputStream.close();
@@ -1001,51 +772,20 @@ public class PgpDecryptVerifyOperation extends BaseOperation<PgpDecryptVerifyInp
         updateProgress(R.string.progress_processing_signature, 60, 100);
         JcaPGPObjectFactory pgpFact = new JcaPGPObjectFactory(aIn);
 
-        PGPSignatureList sigList = (PGPSignatureList) pgpFact.nextObject();
-        if (sigList == null) {
+        PgpSignatureChecker signatureChecker = new PgpSignatureChecker(mProviderHelper);
+
+        Object o = pgpFact.nextObject();
+        if (!signatureChecker.initializeSignature(o, log, indent+1)) {
             log.add(LogType.MSG_DC_ERROR_INVALID_DATA, 0);
             return new DecryptVerifyResult(DecryptVerifyResult.RESULT_ERROR, log);
         }
 
-        PGPSignature signature = processPGPSignatureList(sigList, signatureResultBuilder, log, indent);
-
-        if (signature != null) {
+        if (signatureChecker.isInitialized()) {
             try {
                 updateProgress(R.string.progress_verifying_signature, 90, 100);
-                log.add(LogType.MSG_DC_CLEAR_SIGNATURE_CHECK, indent);
-
-                InputStream sigIn = new BufferedInputStream(new ByteArrayInputStream(clearText));
-
-                lookAhead = readInputLine(lineOut, sigIn);
-
-                processLine(signature, lineOut.toByteArray());
 
-                if (lookAhead != -1) {
-                    do {
-                        lookAhead = readInputLine(lineOut, lookAhead, sigIn);
-
-                        signature.update((byte) '\r');
-                        signature.update((byte) '\n');
-
-                        processLine(signature, lineOut.toByteArray());
-                    } while (lookAhead != -1);
-                }
-
-                // Verify signature and check binding signatures
-                boolean validSignature = signature.verify();
-                if (validSignature) {
-                    log.add(LogType.MSG_DC_CLEAR_SIGNATURE_OK, indent + 1);
-                } else {
-                    log.add(LogType.MSG_DC_CLEAR_SIGNATURE_BAD, indent + 1);
-                }
-
-                // check for insecure hash algorithms
-                if (!PgpSecurityConstants.isSecureHashAlgorithm(signature.getHashAlgorithm())) {
-                    log.add(LogType.MSG_DC_INSECURE_HASH_ALGO, indent + 1);
-                    signatureResultBuilder.setInsecure(true);
-                }
-
-                signatureResultBuilder.setValidSignature(validSignature);
+                signatureChecker.updateSignatureWithCleartext(clearText);
+                signatureChecker.verifySignature(log, indent);
 
             } catch (SignatureException e) {
                 Log.d(Constants.TAG, "SignatureException", e);
@@ -1064,7 +804,7 @@ public class PgpDecryptVerifyOperation extends BaseOperation<PgpDecryptVerifyInp
                 clearText.length);
 
         DecryptVerifyResult result = new DecryptVerifyResult(DecryptVerifyResult.RESULT_OK, log);
-        result.setSignatureResult(signatureResultBuilder.build());
+        result.setSignatureResult(signatureChecker.getSignatureResult());
         result.setDecryptionResult(
                 new OpenPgpDecryptionResult(OpenPgpDecryptionResult.RESULT_NOT_ENCRYPTED));
         result.setDecryptionMetadata(metadata);
@@ -1078,30 +818,28 @@ public class PgpDecryptVerifyOperation extends BaseOperation<PgpDecryptVerifyInp
 
         OperationLog log = new OperationLog();
 
-        OpenPgpSignatureResultBuilder signatureResultBuilder = new OpenPgpSignatureResultBuilder();
-
         updateProgress(R.string.progress_processing_signature, 0, 100);
         InputStream detachedSigIn = new ByteArrayInputStream(input.getDetachedSignature());
         detachedSigIn = PGPUtil.getDecoderStream(detachedSigIn);
 
         JcaPGPObjectFactory pgpFact = new JcaPGPObjectFactory(detachedSigIn);
 
-        PGPSignatureList sigList;
         Object o = pgpFact.nextObject();
         if (o instanceof PGPCompressedData) {
             PGPCompressedData c1 = (PGPCompressedData) o;
             pgpFact = new JcaPGPObjectFactory(c1.getDataStream());
-            sigList = (PGPSignatureList) pgpFact.nextObject();
-        } else if (o instanceof PGPSignatureList) {
-            sigList = (PGPSignatureList) o;
-        } else {
+            o = pgpFact.nextObject();
+        }
+
+        PgpSignatureChecker signatureChecker = new PgpSignatureChecker(mProviderHelper);
+
+        if ( ! signatureChecker.initializeSignature(o, log, indent+1)) {
             log.add(LogType.MSG_DC_ERROR_INVALID_DATA, 0);
             return new DecryptVerifyResult(DecryptVerifyResult.RESULT_ERROR, log);
         }
 
-        PGPSignature signature = processPGPSignatureList(sigList, signatureResultBuilder, log, indent);
+        if (signatureChecker.isInitialized()) {
 
-        if (signature != null) {
             updateProgress(R.string.progress_reading_data, 60, 100);
 
             ProgressScaler progressScaler = new ProgressScaler(mProgressable, 60, 90, 100);
@@ -1116,7 +854,7 @@ public class PgpDecryptVerifyOperation extends BaseOperation<PgpDecryptVerifyInp
                 }
 
                 // update signature buffer if signature is also present
-                signature.update(buffer, 0, length);
+                signatureChecker.updateSignatureData(buffer, 0, length);
 
                 alreadyWritten += length;
                 if (wholeSize > 0) {
@@ -1127,105 +865,28 @@ public class PgpDecryptVerifyOperation extends BaseOperation<PgpDecryptVerifyInp
                     }
                     progressScaler.setProgress((int) progress, 100);
                 }
-                // TODO: slow annealing to fake a progress?
             }
 
             updateProgress(R.string.progress_verifying_signature, 90, 100);
             log.add(LogType.MSG_DC_CLEAR_SIGNATURE_CHECK, indent);
 
-            // Verify signature and check binding signatures
-            boolean validSignature = signature.verify();
-            if (validSignature) {
-                log.add(LogType.MSG_DC_CLEAR_SIGNATURE_OK, indent + 1);
-            } else {
-                log.add(LogType.MSG_DC_CLEAR_SIGNATURE_BAD, indent + 1);
-            }
-
-            // check for insecure hash algorithms
-            if (!PgpSecurityConstants.isSecureHashAlgorithm(signature.getHashAlgorithm())) {
-                log.add(LogType.MSG_DC_INSECURE_HASH_ALGO, indent + 1);
-                signatureResultBuilder.setInsecure(true);
-            }
+            signatureChecker.verifySignature(log, indent);
 
-            signatureResultBuilder.setValidSignature(validSignature);
         }
 
         updateProgress(R.string.progress_done, 100, 100);
 
         log.add(LogType.MSG_DC_OK, indent);
 
+        // TODO return metadata object?
+
         DecryptVerifyResult result = new DecryptVerifyResult(DecryptVerifyResult.RESULT_OK, log);
-        result.setSignatureResult(signatureResultBuilder.build());
+        result.setSignatureResult(signatureChecker.getSignatureResult());
         result.setDecryptionResult(
                 new OpenPgpDecryptionResult(OpenPgpDecryptionResult.RESULT_NOT_ENCRYPTED));
         return result;
     }
 
-    private PGPSignature processPGPSignatureList(
-            PGPSignatureList sigList, OpenPgpSignatureResultBuilder signatureResultBuilder,
-            OperationLog log, int indent)
-            throws PGPException {
-        CanonicalizedPublicKeyRing signingRing = null;
-        CanonicalizedPublicKey signingKey = null;
-        int signatureIndex = -1;
-
-        // go through all signatures
-        // and find out for which signature we have a key in our database
-        for (int i = 0; i < sigList.size(); ++i) {
-            try {
-                long sigKeyId = sigList.get(i).getKeyID();
-                signingRing = mProviderHelper.getCanonicalizedPublicKeyRing(
-                        KeyRings.buildUnifiedKeyRingsFindBySubkeyUri(sigKeyId)
-                );
-                signingKey = signingRing.getPublicKey(sigKeyId);
-                signatureIndex = i;
-            } catch (ProviderHelper.NotFoundException e) {
-                Log.d(Constants.TAG, "key not found, trying next signature...");
-            }
-        }
-
-        PGPSignature signature = null;
-
-        if (signingKey != null) {
-            // key found in our database!
-            signature = sigList.get(signatureIndex);
-
-            signatureResultBuilder.initValid(signingRing, signingKey);
-
-            JcaPGPContentVerifierBuilderProvider contentVerifierBuilderProvider =
-                    new JcaPGPContentVerifierBuilderProvider()
-                            .setProvider(Constants.BOUNCY_CASTLE_PROVIDER_NAME);
-            signature.init(contentVerifierBuilderProvider, signingKey.getPublicKey());
-        } else {
-            // no key in our database -> return "unknown pub key" status including the first key id
-            if (!sigList.isEmpty()) {
-                signatureResultBuilder.setSignatureAvailable(true);
-                signatureResultBuilder.setKnownKey(false);
-                signatureResultBuilder.setKeyId(sigList.get(0).getKeyID());
-            }
-        }
-
-        // check for insecure signing key
-        // TODO: checks on signingRing ?
-        if (signingKey != null && ! PgpSecurityConstants.isSecureKey(signingKey)) {
-            log.add(LogType.MSG_DC_INSECURE_KEY, indent + 1);
-            signatureResultBuilder.setInsecure(true);
-        }
-
-        return signature;
-    }
-
-    /**
-     * Mostly taken from ClearSignedFileProcessor in Bouncy Castle
-     */
-    private static void processLine(PGPSignature sig, byte[] line)
-            throws SignatureException {
-        int length = getLengthWithoutWhiteSpace(line);
-        if (length > 0) {
-            sig.update(line, 0, length);
-        }
-    }
-
     private static int readInputLine(ByteArrayOutputStream bOut, InputStream fIn)
             throws IOException {
         bOut.reset();
@@ -1291,20 +952,6 @@ public class PgpDecryptVerifyOperation extends BaseOperation<PgpDecryptVerifyInp
         return b == '\r' || b == '\n';
     }
 
-    private static int getLengthWithoutWhiteSpace(byte[] line) {
-        int end = line.length - 1;
-
-        while (end >= 0 && isWhiteSpace(line[end])) {
-            end--;
-        }
-
-        return end + 1;
-    }
-
-    private static boolean isWhiteSpace(byte b) {
-        return b == '\r' || b == '\n' || b == '\t' || b == ' ';
-    }
-
     private static byte[] getLineSeparator() {
         String nl = System.getProperty("line.separator");
         return nl.getBytes();
diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/PgpKeyOperation.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/PgpKeyOperation.java
index 6f156c201..59b840054 100644
--- a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/PgpKeyOperation.java
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/PgpKeyOperation.java
@@ -171,8 +171,8 @@ public class PgpKeyOperation {
                     log.add(LogType.MSG_CR_ERROR_NO_KEYSIZE, indent);
                     return null;
                 }
-                if (add.mKeySize < 512) {
-                    log.add(LogType.MSG_CR_ERROR_KEYSIZE_512, indent);
+                if (add.mKeySize < 2048) {
+                    log.add(LogType.MSG_CR_ERROR_KEYSIZE_2048, indent);
                     return null;
                 }
             }
diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/PgpSignEncryptOperation.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/PgpSignEncryptOperation.java
index 0879181a7..ecc190d97 100644
--- a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/PgpSignEncryptOperation.java
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/PgpSignEncryptOperation.java
@@ -492,9 +492,7 @@ public class PgpSignEncryptOperation extends BaseOperation {
 
                 literalGen.close();
             } else {
-                pOut = null;
-                // TODO: Is this log right?
-                log.add(LogType.MSG_PSE_CLEARSIGN_ONLY, indent);
+                throw new AssertionError("cannot clearsign in non-ascii armored text, this is a bug!");
             }
 
             if (enableSignature) {
diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/PgpSignatureChecker.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/PgpSignatureChecker.java
new file mode 100644
index 000000000..4067372a1
--- /dev/null
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/PgpSignatureChecker.java
@@ -0,0 +1,344 @@
+package org.sufficientlysecure.keychain.pgp;
+
+
+import java.io.BufferedInputStream;
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.security.SignatureException;
+
+import org.openintents.openpgp.OpenPgpSignatureResult;
+import org.spongycastle.openpgp.PGPException;
+import org.spongycastle.openpgp.PGPOnePassSignature;
+import org.spongycastle.openpgp.PGPOnePassSignatureList;
+import org.spongycastle.openpgp.PGPSignature;
+import org.spongycastle.openpgp.PGPSignatureList;
+import org.spongycastle.openpgp.operator.jcajce.JcaPGPContentVerifierBuilderProvider;
+import org.sufficientlysecure.keychain.Constants;
+import org.sufficientlysecure.keychain.operations.results.OperationResult.LogType;
+import org.sufficientlysecure.keychain.operations.results.OperationResult.OperationLog;
+import org.sufficientlysecure.keychain.provider.KeychainContract.KeyRings;
+import org.sufficientlysecure.keychain.provider.ProviderHelper;
+import org.sufficientlysecure.keychain.util.Log;
+
+
+/** This class is used to track the state of a single signature verification.
+ *
+ *
+ */
+class PgpSignatureChecker {
+
+    OpenPgpSignatureResultBuilder signatureResultBuilder = new OpenPgpSignatureResultBuilder();
+
+    private CanonicalizedPublicKey signingKey;
+
+    private int signatureIndex;
+    PGPOnePassSignature onePassSignature;
+    PGPSignature signature;
+
+    ProviderHelper mProviderHelper;
+
+    PgpSignatureChecker(ProviderHelper providerHelper) {
+        mProviderHelper = providerHelper;
+    }
+
+    boolean initializeSignature(Object dataChunk, OperationLog log, int indent) throws PGPException {
+
+        if (!(dataChunk instanceof PGPSignatureList)) {
+            return false;
+        }
+
+        PGPSignatureList sigList = (PGPSignatureList) dataChunk;
+        findAvailableSignature(sigList);
+
+        if (signingKey != null) {
+
+            // key found in our database!
+            signatureResultBuilder.initValid(signingKey);
+
+            JcaPGPContentVerifierBuilderProvider contentVerifierBuilderProvider =
+                    new JcaPGPContentVerifierBuilderProvider()
+                            .setProvider(Constants.BOUNCY_CASTLE_PROVIDER_NAME);
+            signature.init(contentVerifierBuilderProvider, signingKey.getPublicKey());
+            checkKeySecurity(log, indent);
+
+
+        } else if (!sigList.isEmpty()) {
+
+            signatureResultBuilder.setSignatureAvailable(true);
+            signatureResultBuilder.setKnownKey(false);
+            signatureResultBuilder.setKeyId(sigList.get(0).getKeyID());
+
+        }
+
+        return true;
+
+    }
+
+    boolean initializeOnePassSignature(Object dataChunk, OperationLog log, int indent) throws PGPException {
+
+        if (!(dataChunk instanceof PGPOnePassSignatureList)) {
+            return false;
+        }
+
+        log.add(LogType.MSG_DC_CLEAR_SIGNATURE, indent + 1);
+
+        PGPOnePassSignatureList sigList = (PGPOnePassSignatureList) dataChunk;
+        findAvailableSignature(sigList);
+
+        if (signingKey != null) {
+
+            // key found in our database!
+            signatureResultBuilder.initValid(signingKey);
+
+            JcaPGPContentVerifierBuilderProvider contentVerifierBuilderProvider =
+                    new JcaPGPContentVerifierBuilderProvider()
+                            .setProvider(Constants.BOUNCY_CASTLE_PROVIDER_NAME);
+            onePassSignature.init(contentVerifierBuilderProvider, signingKey.getPublicKey());
+
+            checkKeySecurity(log, indent);
+
+        } else if (!sigList.isEmpty()) {
+
+            signatureResultBuilder.setSignatureAvailable(true);
+            signatureResultBuilder.setKnownKey(false);
+            signatureResultBuilder.setKeyId(sigList.get(0).getKeyID());
+
+        }
+
+        return true;
+
+    }
+
+    private void checkKeySecurity(OperationLog log, int indent) {
+        // TODO: checks on signingRing ?
+        if (!PgpSecurityConstants.isSecureKey(signingKey)) {
+            log.add(LogType.MSG_DC_INSECURE_KEY, indent + 1);
+            signatureResultBuilder.setInsecure(true);
+        }
+    }
+
+    public boolean isInitialized() {
+        return signingKey != null;
+    }
+
+    private void findAvailableSignature(PGPOnePassSignatureList sigList) {
+        // go through all signatures (should be just one), make sure we have
+        //  the key and it matches the one we’re looking for
+        for (int i = 0; i < sigList.size(); ++i) {
+            try {
+                long sigKeyId = sigList.get(i).getKeyID();
+                CanonicalizedPublicKeyRing signingRing = mProviderHelper.getCanonicalizedPublicKeyRing(
+                        KeyRings.buildUnifiedKeyRingsFindBySubkeyUri(sigKeyId)
+                );
+                CanonicalizedPublicKey keyCandidate = signingRing.getPublicKey(sigKeyId);
+                if ( ! signingKey.canSign()) {
+                    continue;
+                }
+                signatureIndex = i;
+                signingKey = keyCandidate;
+                onePassSignature = sigList.get(i);
+                return;
+            } catch (ProviderHelper.NotFoundException e) {
+                Log.d(Constants.TAG, "key not found, trying next signature...");
+            }
+        }
+    }
+
+    public void findAvailableSignature(PGPSignatureList sigList) {
+        // go through all signatures (should be just one), make sure we have
+        //  the key and it matches the one we’re looking for
+        for (int i = 0; i < sigList.size(); ++i) {
+            try {
+                long sigKeyId = sigList.get(i).getKeyID();
+                CanonicalizedPublicKeyRing signingRing = mProviderHelper.getCanonicalizedPublicKeyRing(
+                        KeyRings.buildUnifiedKeyRingsFindBySubkeyUri(sigKeyId)
+                );
+                CanonicalizedPublicKey keyCandidate = signingRing.getPublicKey(sigKeyId);
+                if ( ! signingKey.canSign()) {
+                    continue;
+                }
+                signatureIndex = i;
+                signingKey = keyCandidate;
+                signature = sigList.get(i);
+                return;
+            } catch (ProviderHelper.NotFoundException e) {
+                Log.d(Constants.TAG, "key not found, trying next signature...");
+            }
+        }
+    }
+
+    public void updateSignatureWithCleartext(byte[] clearText) throws IOException, SignatureException {
+
+        InputStream sigIn = new BufferedInputStream(new ByteArrayInputStream(clearText));
+
+        ByteArrayOutputStream outputBuffer = new ByteArrayOutputStream();
+
+        int lookAhead = readInputLine(outputBuffer, sigIn);
+
+        processLine(signature, outputBuffer.toByteArray());
+
+        while (lookAhead != -1) {
+            lookAhead = readInputLine(outputBuffer, lookAhead, sigIn);
+
+            signature.update((byte) '\r');
+            signature.update((byte) '\n');
+
+            processLine(signature, outputBuffer.toByteArray());
+        }
+
+    }
+
+    public void updateSignatureData(byte[] buf, int off, int len) {
+        if (signature != null) {
+            signature.update(buf, off, len);
+        } else if (onePassSignature != null) {
+            onePassSignature.update(buf, off, len);
+        }
+    }
+
+    void verifySignature(OperationLog log, int indent) throws PGPException {
+
+        log.add(LogType.MSG_DC_CLEAR_SIGNATURE_CHECK, indent);
+
+        // Verify signature
+        boolean validSignature = signature.verify();
+        if (validSignature) {
+            log.add(LogType.MSG_DC_CLEAR_SIGNATURE_OK, indent + 1);
+        } else {
+            log.add(LogType.MSG_DC_CLEAR_SIGNATURE_BAD, indent + 1);
+        }
+
+        // check for insecure hash algorithms
+        if (!PgpSecurityConstants.isSecureHashAlgorithm(signature.getHashAlgorithm())) {
+            log.add(LogType.MSG_DC_INSECURE_HASH_ALGO, indent + 1);
+            signatureResultBuilder.setInsecure(true);
+        }
+
+        signatureResultBuilder.setValidSignature(validSignature);
+
+    }
+
+    boolean verifySignatureOnePass(Object o, OperationLog log, int indent) throws PGPException {
+
+        if (!(o instanceof PGPSignatureList)) {
+            log.add(LogType.MSG_DC_ERROR_NO_SIGNATURE, indent);
+            return false;
+        }
+        PGPSignatureList signatureList = (PGPSignatureList) o;
+        if (signatureList.size() <= signatureIndex) {
+            log.add(LogType.MSG_DC_ERROR_NO_SIGNATURE, indent);
+            return false;
+        }
+
+        // PGPOnePassSignature and PGPSignature packets are "bracketed",
+        // so we need to take the last-minus-index'th element here
+        PGPSignature messageSignature = signatureList.get(signatureList.size() - 1 - signatureIndex);
+
+        // Verify signature
+        boolean validSignature = onePassSignature.verify(messageSignature);
+        if (validSignature) {
+            log.add(LogType.MSG_DC_CLEAR_SIGNATURE_OK, indent + 1);
+        } else {
+            log.add(LogType.MSG_DC_CLEAR_SIGNATURE_BAD, indent + 1);
+        }
+
+        // check for insecure hash algorithms
+        if (!PgpSecurityConstants.isSecureHashAlgorithm(onePassSignature.getHashAlgorithm())) {
+            log.add(LogType.MSG_DC_INSECURE_HASH_ALGO, indent + 1);
+            signatureResultBuilder.setInsecure(true);
+        }
+
+        signatureResultBuilder.setValidSignature(validSignature);
+
+        return true;
+
+    }
+
+    public byte[] getSigningFingerprint() {
+        return signingKey.getFingerprint();
+    }
+
+    public OpenPgpSignatureResult getSignatureResult() {
+        return signatureResultBuilder.build();
+    }
+
+    /**
+     * Mostly taken from ClearSignedFileProcessor in Bouncy Castle
+     */
+
+    private static void processLine(PGPSignature sig, byte[] line)
+            throws SignatureException {
+        int length = getLengthWithoutWhiteSpace(line);
+        if (length > 0) {
+            sig.update(line, 0, length);
+        }
+    }
+
+    private static int readInputLine(ByteArrayOutputStream bOut, InputStream fIn)
+            throws IOException {
+        bOut.reset();
+
+        int lookAhead = -1;
+        int ch;
+
+        while ((ch = fIn.read()) >= 0) {
+            bOut.write(ch);
+            if (ch == '\r' || ch == '\n') {
+                lookAhead = readPastEOL(bOut, ch, fIn);
+                break;
+            }
+        }
+
+        return lookAhead;
+    }
+
+    private static int readInputLine(ByteArrayOutputStream bOut, int lookAhead, InputStream fIn)
+            throws IOException {
+        bOut.reset();
+
+        int ch = lookAhead;
+
+        do {
+            bOut.write(ch);
+            if (ch == '\r' || ch == '\n') {
+                lookAhead = readPastEOL(bOut, ch, fIn);
+                break;
+            }
+        } while ((ch = fIn.read()) >= 0);
+
+        if (ch < 0) {
+            lookAhead = -1;
+        }
+
+        return lookAhead;
+    }
+
+    private static int readPastEOL(ByteArrayOutputStream bOut, int lastCh, InputStream fIn)
+            throws IOException {
+        int lookAhead = fIn.read();
+
+        if (lastCh == '\r' && lookAhead == '\n') {
+            bOut.write(lookAhead);
+            lookAhead = fIn.read();
+        }
+
+        return lookAhead;
+    }
+
+    private static int getLengthWithoutWhiteSpace(byte[] line) {
+        int end = line.length - 1;
+
+        while (end >= 0 && isWhiteSpace(line[end])) {
+            end--;
+        }
+
+        return end + 1;
+    }
+
+    private static boolean isWhiteSpace(byte b) {
+        return b == '\r' || b == '\n' || b == '\t' || b == ' ';
+    }
+
+}
diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/UncachedKeyRing.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/UncachedKeyRing.java
index c8cdbd59d..c967a5abc 100644
--- a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/UncachedKeyRing.java
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/UncachedKeyRing.java
@@ -83,6 +83,8 @@ public class UncachedKeyRing {
     final PGPKeyRing mRing;
     final boolean mIsSecret;
 
+    private static final int CANONICALIZE_MAX_USER_IDS = 100;
+
     UncachedKeyRing(PGPKeyRing ring) {
         mRing = ring;
         mIsSecret = ring instanceof PGPSecretKeyRing;
@@ -460,7 +462,7 @@ public class UncachedKeyRing {
                     // strip out the first found user id with this name
                     modified = PGPPublicKey.removeCertification(modified, rawUserId);
                 }
-                if (processedUserIds.size() > 100) {
+                if (processedUserIds.size() > CANONICALIZE_MAX_USER_IDS) {
                     log.add(LogType.MSG_KC_UID_TOO_MANY, indent, userId);
                     // strip out the user id
                     modified = PGPPublicKey.removeCertification(modified, rawUserId);
diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/provider/ProviderHelper.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/provider/ProviderHelper.java
index a6823d3ac..375775ff1 100644
--- a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/provider/ProviderHelper.java
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/provider/ProviderHelper.java
@@ -62,7 +62,6 @@ import org.sufficientlysecure.keychain.provider.KeychainContract.Certs;
 import org.sufficientlysecure.keychain.provider.KeychainContract.KeyRingData;
 import org.sufficientlysecure.keychain.provider.KeychainContract.KeyRings;
 import org.sufficientlysecure.keychain.provider.KeychainContract.Keys;
-import org.sufficientlysecure.keychain.provider.KeychainContract.UserPackets;
 import org.sufficientlysecure.keychain.provider.KeychainContract.UpdatedKeys;
 import org.sufficientlysecure.keychain.remote.AccountSettings;
 import org.sufficientlysecure.keychain.remote.AppSettings;
@@ -968,7 +967,7 @@ public class ProviderHelper {
 
             // If we have an expected fingerprint, make sure it matches
             if (expectedFingerprint != null) {
-                if (!canPublicRing.containsSubkey(expectedFingerprint)) {
+                if (!canPublicRing.containsBoundSubkey(expectedFingerprint)) {
                     log(LogType.MSG_IP_FINGERPRINT_ERROR);
                     return new SaveKeyringResult(SaveKeyringResult.RESULT_ERROR, mLog, null);
                 } else {
diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/CreateYubiKeyImportFragment.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/CreateYubiKeyImportFragment.java
index f7925b7f4..648c5f962 100644
--- a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/CreateYubiKeyImportFragment.java
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/CreateYubiKeyImportFragment.java
@@ -49,7 +49,7 @@ public class CreateYubiKeyImportFragment
         extends QueueingCryptoOperationFragment<ImportKeyringParcel, ImportKeyResult>
         implements NfcListenerFragment {
 
-    private static final String ARG_FINGERPRINT = "fingerprint";
+    private static final String ARG_FINGERPRINTS = "fingerprint";
     public static final String ARG_AID = "aid";
     public static final String ARG_USER_ID = "user_ids";
 
@@ -72,7 +72,7 @@ public class CreateYubiKeyImportFragment
         CreateYubiKeyImportFragment frag = new CreateYubiKeyImportFragment();
 
         Bundle args = new Bundle();
-        args.putByteArray(ARG_FINGERPRINT, scannedFingerprints);
+        args.putByteArray(ARG_FINGERPRINTS, scannedFingerprints);
         args.putByteArray(ARG_AID, nfcAid);
         args.putString(ARG_USER_ID, userId);
         frag.setArguments(args);
@@ -86,7 +86,7 @@ public class CreateYubiKeyImportFragment
 
         Bundle args = savedInstanceState != null ? savedInstanceState : getArguments();
 
-        mNfcFingerprints = args.getByteArray(ARG_FINGERPRINT);
+        mNfcFingerprints = args.getByteArray(ARG_FINGERPRINTS);
         mNfcAid = args.getByteArray(ARG_AID);
         mNfcUserId = args.getString(ARG_USER_ID);
 
@@ -149,7 +149,7 @@ public class CreateYubiKeyImportFragment
     public void onSaveInstanceState(Bundle args) {
         super.onSaveInstanceState(args);
 
-        args.putByteArray(ARG_FINGERPRINT, mNfcFingerprints);
+        args.putByteArray(ARG_FINGERPRINTS, mNfcFingerprints);
         args.putByteArray(ARG_AID, mNfcAid);
         args.putString(ARG_USER_ID, mNfcUserId);
     }
diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/DisplayTextFragment.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/DisplayTextFragment.java
index dc06e9115..1060714f0 100644
--- a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/DisplayTextFragment.java
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/DisplayTextFragment.java
@@ -36,7 +36,6 @@ import org.sufficientlysecure.keychain.R;
 import org.sufficientlysecure.keychain.operations.results.DecryptVerifyResult;
 import org.sufficientlysecure.keychain.ui.util.Notify;
 import org.sufficientlysecure.keychain.ui.util.Notify.Style;
-import org.sufficientlysecure.keychain.util.ShareHelper;
 
 public class DisplayTextFragment extends DecryptFragment {
 
@@ -60,22 +59,6 @@ public class DisplayTextFragment extends DecryptFragment {
         return frag;
     }
 
-    /**
-     * Create Intent Chooser but exclude decrypt activites
-     */
-    private Intent sendWithChooserExcludingDecrypt(String text) {
-        Intent prototype = createSendIntent(text);
-        String title = getString(R.string.title_share_message);
-
-        // we don't want to decrypt the decrypted, no inception ;)
-        String[] blacklist = new String[]{
-                Constants.PACKAGE_NAME + ".ui.DecryptActivity",
-                "org.thialfihar.android.apg.ui.DecryptActivity"
-        };
-
-        return new ShareHelper(getActivity()).createChooserExcluding(prototype, title, blacklist);
-    }
-
     private Intent createSendIntent(String text) {
         Intent sendIntent = new Intent(Intent.ACTION_SEND);
         sendIntent.putExtra(Intent.EXTRA_TEXT, text);
@@ -146,7 +129,8 @@ public class DisplayTextFragment extends DecryptFragment {
     public boolean onOptionsItemSelected(MenuItem item) {
         switch (item.getItemId()) {
             case R.id.decrypt_share: {
-                startActivity(sendWithChooserExcludingDecrypt(mText.getText().toString()));
+                startActivity(Intent.createChooser(createSendIntent(mText.getText().toString()),
+                        getString(R.string.title_share_message)));
                 break;
             }
             case R.id.decrypt_copy: {
diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/EncryptFilesFragment.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/EncryptFilesFragment.java
index dab451537..3d1629ffb 100644
--- a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/EncryptFilesFragment.java
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/EncryptFilesFragment.java
@@ -71,7 +71,6 @@ import org.sufficientlysecure.keychain.util.FileHelper;
 import org.sufficientlysecure.keychain.util.Log;
 import org.sufficientlysecure.keychain.util.Passphrase;
 import org.sufficientlysecure.keychain.util.Preferences;
-import org.sufficientlysecure.keychain.util.ShareHelper;
 
 public class EncryptFilesFragment
         extends CachingCryptoOperationFragment<SignEncryptParcel, SignEncryptResult> {
@@ -406,7 +405,7 @@ public class EncryptFilesFragment
                 public void onDeleted() {
                     if (mAfterEncryptAction == AfterEncryptAction.SHARE) {
                         // Share encrypted message/file
-                        startActivity(sendWithChooserExcludingEncrypt());
+                        startActivity(Intent.createChooser(createSendIntent(), getString(R.string.title_share_file)));
                     } else {
                         Activity activity = getActivity();
                         if (activity == null) {
@@ -426,7 +425,7 @@ public class EncryptFilesFragment
 
                 case SHARE:
                     // Share encrypted message/file
-                    startActivity(sendWithChooserExcludingEncrypt());
+                    startActivity(Intent.createChooser(createSendIntent(), getString(R.string.title_share_file)));
                     break;
 
                 case COPY:
@@ -622,22 +621,6 @@ public class EncryptFilesFragment
         return data;
     }
 
-    /**
-     * Create Intent Chooser but exclude OK's EncryptActivity.
-     */
-    private Intent sendWithChooserExcludingEncrypt() {
-        Intent prototype = createSendIntent();
-        String title = getString(R.string.title_share_file);
-
-        // we don't want to encrypt the encrypted, no inception ;)
-        String[] blacklist = new String[]{
-                Constants.PACKAGE_NAME + ".ui.EncryptFilesActivity",
-                "org.thialfihar.android.apg.ui.EncryptActivity"
-        };
-
-        return new ShareHelper(getActivity()).createChooserExcluding(prototype, title, blacklist);
-    }
-
     private Intent createSendIntent() {
         Intent sendIntent;
         // file
diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/EncryptTextFragment.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/EncryptTextFragment.java
index ab676285e..0513a6495 100644
--- a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/EncryptTextFragment.java
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/EncryptTextFragment.java
@@ -46,7 +46,6 @@ import org.sufficientlysecure.keychain.ui.util.Notify.ActionListener;
 import org.sufficientlysecure.keychain.ui.util.Notify.Style;
 import org.sufficientlysecure.keychain.util.Passphrase;
 import org.sufficientlysecure.keychain.util.Preferences;
-import org.sufficientlysecure.keychain.util.ShareHelper;
 
 import java.util.Date;
 import java.util.HashSet;
@@ -289,22 +288,6 @@ public class EncryptTextFragment
         result.createNotify(activity).show();
     }
 
-    /**
-     * Create Intent Chooser but exclude OK's EncryptActivity.
-     */
-    private Intent sendWithChooserExcludingEncrypt(byte[] resultBytes) {
-        Intent prototype = createSendIntent(resultBytes);
-        String title = getString(R.string.title_share_message);
-
-        // we don't want to encrypt the encrypted, no inception ;)
-        String[] blacklist = new String[]{
-                Constants.PACKAGE_NAME + ".ui.EncryptTextActivity",
-                "org.thialfihar.android.apg.ui.EncryptActivity"
-        };
-
-        return new ShareHelper(getActivity()).createChooserExcluding(prototype, title, blacklist);
-    }
-
     private Intent createSendIntent(byte[] resultBytes) {
         Intent sendIntent;
         sendIntent = new Intent(Intent.ACTION_SEND);
@@ -343,7 +326,8 @@ public class EncryptTextFragment
 
         if (mShareAfterEncrypt) {
             // Share encrypted message/file
-            startActivity(sendWithChooserExcludingEncrypt(result.getResultBytes()));
+            startActivity(Intent.createChooser(createSendIntent(result.getResultBytes()),
+                    getString(R.string.title_share_message)));
         } else {
             // Copy to clipboard
             copyToClipboard(result);
diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/LogDisplayFragment.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/LogDisplayFragment.java
index 43c8d2643..e29cd0204 100644
--- a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/LogDisplayFragment.java
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/LogDisplayFragment.java
@@ -44,6 +44,7 @@ import org.sufficientlysecure.keychain.operations.results.OperationResult.LogEnt
 import org.sufficientlysecure.keychain.operations.results.OperationResult.LogLevel;
 import org.sufficientlysecure.keychain.operations.results.OperationResult.SubLogEntryParcel;
 import org.sufficientlysecure.keychain.provider.TemporaryStorageProvider;
+import org.sufficientlysecure.keychain.ui.dialog.ShareLogDialogFragment;
 import org.sufficientlysecure.keychain.ui.util.FormattingUtils;
 import org.sufficientlysecure.keychain.ui.util.Notify;
 import org.sufficientlysecure.keychain.ui.util.Notify.Style;
@@ -149,11 +150,9 @@ public class LogDisplayFragment extends ListFragment implements OnItemClickListe
             }
         }
 
-        Intent intent = new Intent(Intent.ACTION_SEND);
-        intent.putExtra(Intent.EXTRA_STREAM, mLogTempFile);
-        intent.setType("text/plain");
-        intent.setFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
-        startActivity(intent);
+
+        ShareLogDialogFragment shareLogDialog = ShareLogDialogFragment.newInstance(mLogTempFile);
+        shareLogDialog.show(getActivity().getSupportFragmentManager(), "shareLogDialog");
 
     }
 
diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/dialog/AddSubkeyDialogFragment.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/dialog/AddSubkeyDialogFragment.java
index b51d081e1..cd5281c7c 100644
--- a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/dialog/AddSubkeyDialogFragment.java
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/dialog/AddSubkeyDialogFragment.java
@@ -348,30 +348,30 @@ public class AddSubkeyDialogFragment extends DialogFragment {
 
     /**
      * <h3>RSA</h3>
-     * <p>for RSA algorithm, key length must be greater than 1024 (according to
-     * <a href="https://github.com/open-keychain/open-keychain/issues/102">#102</a>). Possibility to generate keys bigger
+     * <p>for RSA algorithm, key length must be greater than 2048. Possibility to generate keys bigger
      * than 8192 bits is currently disabled, because it's almost impossible to generate them on a mobile device (check
      * <a href="http://www.javamex.com/tutorials/cryptography/rsa_key_length.shtml">RSA key length plot</a> and
      * <a href="http://www.keylength.com/">Cryptographic Key Length Recommendation</a>). Also, key length must be a
      * multiplicity of 8.</p>
      * <h3>ElGamal</h3>
-     * <p>For ElGamal algorithm, supported key lengths are 1536, 2048, 3072, 4096 or 8192 bits.</p>
+     * <p>For ElGamal algorithm, supported key lengths are 2048, 3072, 4096 or 8192 bits.</p>
      * <h3>DSA</h3>
-     * <p>For DSA algorithm key length must be between 512 and 1024. Also, it must me dividable by 64.</p>
+     * <p>For DSA algorithm key length must be between 2048 and 3072. Also, it must me dividable by 64.</p>
      *
      * @return correct key length, according to SpongyCastle specification. Returns <code>-1</code>, if key length is
      * inappropriate.
      */
     private int getProperKeyLength(Algorithm algorithm, int currentKeyLength) {
-        final int[] elGamalSupportedLengths = {1536, 2048, 3072, 4096, 8192};
+        final int[] elGamalSupportedLengths = {2048, 3072, 4096, 8192};
         int properKeyLength = -1;
         switch (algorithm) {
-            case RSA:
-                if (currentKeyLength > 1024 && currentKeyLength <= 16384) {
+            case RSA: {
+                if (currentKeyLength >= 2048 && currentKeyLength <= 16384) {
                     properKeyLength = currentKeyLength + ((8 - (currentKeyLength % 8)) % 8);
                 }
                 break;
-            case ELGAMAL:
+            }
+            case ELGAMAL: {
                 int[] elGammalKeyDiff = new int[elGamalSupportedLengths.length];
                 for (int i = 0; i < elGamalSupportedLengths.length; i++) {
                     elGammalKeyDiff[i] = Math.abs(elGamalSupportedLengths[i] - currentKeyLength);
@@ -386,11 +386,14 @@ public class AddSubkeyDialogFragment extends DialogFragment {
                 }
                 properKeyLength = elGamalSupportedLengths[minimalIndex];
                 break;
-            case DSA:
-                if (currentKeyLength >= 512 && currentKeyLength <= 1024) {
+            }
+            case DSA: {
+                // Bouncy Castle supports 4096 maximum
+                if (currentKeyLength >= 2048 && currentKeyLength <= 4096) {
                     properKeyLength = currentKeyLength + ((64 - (currentKeyLength % 64)) % 64);
                 }
                 break;
+            }
         }
         return properKeyLength;
     }
@@ -424,7 +427,7 @@ public class AddSubkeyDialogFragment extends DialogFragment {
         final ArrayAdapter<CharSequence> keySizeAdapter = (ArrayAdapter<CharSequence>) mKeySizeSpinner.getAdapter();
         keySizeAdapter.clear();
         switch (algorithm) {
-            case RSA:
+            case RSA: {
                 replaceArrayAdapterContent(keySizeAdapter, R.array.rsa_key_size_spinner_values);
                 mKeySizeSpinner.setSelection(1);
                 mKeySizeRow.setVisibility(View.VISIBLE);
@@ -450,7 +453,8 @@ public class AddSubkeyDialogFragment extends DialogFragment {
                 }
                 mFlagAuthenticate.setChecked(false);
                 break;
-            case ELGAMAL:
+            }
+            case ELGAMAL: {
                 replaceArrayAdapterContent(keySizeAdapter, R.array.elgamal_key_size_spinner_values);
                 mKeySizeSpinner.setSelection(3);
                 mKeySizeRow.setVisibility(View.VISIBLE);
@@ -466,7 +470,8 @@ public class AddSubkeyDialogFragment extends DialogFragment {
                 mFlagAuthenticate.setChecked(false);
                 mFlagAuthenticate.setEnabled(false);
                 break;
-            case DSA:
+            }
+            case DSA: {
                 replaceArrayAdapterContent(keySizeAdapter, R.array.dsa_key_size_spinner_values);
                 mKeySizeSpinner.setSelection(2);
                 mKeySizeRow.setVisibility(View.VISIBLE);
@@ -482,7 +487,8 @@ public class AddSubkeyDialogFragment extends DialogFragment {
                 mFlagAuthenticate.setChecked(false);
                 mFlagAuthenticate.setEnabled(false);
                 break;
-            case ECDSA:
+            }
+            case ECDSA: {
                 mKeySizeRow.setVisibility(View.GONE);
                 mCurveRow.setVisibility(View.VISIBLE);
                 mCustomKeyInfoTextView.setText("");
@@ -496,7 +502,8 @@ public class AddSubkeyDialogFragment extends DialogFragment {
                 mFlagAuthenticate.setEnabled(true);
                 mFlagAuthenticate.setChecked(false);
                 break;
-            case ECDH:
+            }
+            case ECDH: {
                 mKeySizeRow.setVisibility(View.GONE);
                 mCurveRow.setVisibility(View.VISIBLE);
                 mCustomKeyInfoTextView.setText("");
@@ -510,6 +517,7 @@ public class AddSubkeyDialogFragment extends DialogFragment {
                 mFlagAuthenticate.setChecked(false);
                 mFlagAuthenticate.setEnabled(false);
                 break;
+            }
         }
         keySizeAdapter.notifyDataSetChanged();
 
diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/dialog/ShareLogDialogFragment.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/dialog/ShareLogDialogFragment.java
new file mode 100644
index 000000000..d4783fad2
--- /dev/null
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/dialog/ShareLogDialogFragment.java
@@ -0,0 +1,79 @@
+/*
+ * Copyright (C) 2015 Dominik Schürmann <dominik@dominikschuermann.de>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package org.sufficientlysecure.keychain.ui.dialog;
+
+import android.app.Dialog;
+import android.content.DialogInterface;
+import android.content.Intent;
+import android.net.Uri;
+import android.os.Bundle;
+import android.support.annotation.NonNull;
+import android.support.v4.app.DialogFragment;
+import android.view.ContextThemeWrapper;
+
+import org.sufficientlysecure.keychain.R;
+import org.sufficientlysecure.keychain.ui.util.ThemeChanger;
+
+public class ShareLogDialogFragment extends DialogFragment {
+    private static final String ARG_STREAM = "stream";
+
+    public static ShareLogDialogFragment newInstance(Uri stream) {
+        Bundle args = new Bundle();
+        args.putParcelable(ARG_STREAM, stream);
+
+        ShareLogDialogFragment fragment = new ShareLogDialogFragment();
+        fragment.setArguments(args);
+
+        return fragment;
+    }
+
+    @NonNull
+    @Override
+    public Dialog onCreateDialog(Bundle savedInstanceState) {
+
+        final Uri stream = getArguments().getParcelable(ARG_STREAM);
+
+        ContextThemeWrapper theme = ThemeChanger.getDialogThemeWrapper(getActivity());
+
+        CustomAlertDialogBuilder builder = new CustomAlertDialogBuilder(theme);
+        builder.setTitle(R.string.share_log_dialog_title)
+                .setMessage(R.string.share_log_dialog_message)
+                .setNegativeButton(R.string.share_log_dialog_cancel_button,
+                        new DialogInterface.OnClickListener() {
+                            @Override
+                            public void onClick(DialogInterface dialog, int which) {
+                                dismiss();
+                            }
+                        })
+                .setPositiveButton(R.string.share_log_dialog_share_button,
+                        new DialogInterface.OnClickListener() {
+                            @Override
+                            public void onClick(DialogInterface dialog, int which) {
+                                dismiss();
+                                Intent intent = new Intent(Intent.ACTION_SEND);
+                                intent.putExtra(Intent.EXTRA_STREAM, stream);
+                                intent.setType("text/plain");
+                                intent.setFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
+                                startActivity(intent);
+                            }
+                        });
+
+        return builder.show();
+    }
+
+}
diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/util/ShareHelper.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/util/ShareHelper.java
deleted file mode 100644
index 0297d149c..000000000
--- a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/util/ShareHelper.java
+++ /dev/null
@@ -1,104 +0,0 @@
-/*
- * Copyright (C) 2014 Dominik Schürmann <dominik@dominikschuermann.de>
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-
-package org.sufficientlysecure.keychain.util;
-
-import android.content.Context;
-import android.content.Intent;
-import android.content.pm.LabeledIntent;
-import android.content.pm.ResolveInfo;
-import android.os.Build;
-import android.os.Parcelable;
-
-import java.util.ArrayList;
-import java.util.Arrays;
-import java.util.Collections;
-import java.util.Comparator;
-import java.util.List;
-
-public class ShareHelper {
-    Context mContext;
-
-    public ShareHelper(Context context) {
-        mContext = context;
-    }
-
-    /**
-     * Create Intent Chooser but exclude specific activites, e.g., EncryptActivity to prevent encrypting again
-     * <p/>
-     * Put together from some stackoverflow posts...
-     */
-    public Intent createChooserExcluding(Intent prototype, String title, String[] activityBlacklist) {
-        // Produced an empty list on Huawei U8860 with Android Version 4.0.3
-        // TODO: test on 4.1, 4.2, 4.3, only tested on 4.4
-        // Disabled on 5.0 because using EXTRA_INITIAL_INTENTS prevents the usage based sorting
-        // introduced in 5.0: https://medium.com/@xXxXxXxXxXam/how-lollipops-share-menu-is-organized-d204888f606d
-        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT || Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
-            return Intent.createChooser(prototype, title);
-        }
-
-        List<LabeledIntent> targetedShareIntents = new ArrayList<>();
-
-        List<ResolveInfo> resInfoList = mContext.getPackageManager().queryIntentActivities(prototype, 0);
-        List<ResolveInfo> resInfoListFiltered = new ArrayList<>();
-        if (!resInfoList.isEmpty()) {
-            for (ResolveInfo resolveInfo : resInfoList) {
-                // do not add blacklisted ones
-                if (resolveInfo.activityInfo == null || Arrays.asList(activityBlacklist).contains(resolveInfo.activityInfo.name))
-                    continue;
-
-                resInfoListFiltered.add(resolveInfo);
-            }
-
-            if (!resInfoListFiltered.isEmpty()) {
-                // sorting for nice readability
-                Collections.sort(resInfoListFiltered, new Comparator<ResolveInfo>() {
-                    @Override
-                    public int compare(ResolveInfo first, ResolveInfo second) {
-                        String firstName = first.loadLabel(mContext.getPackageManager()).toString();
-                        String secondName = second.loadLabel(mContext.getPackageManager()).toString();
-                        return firstName.compareToIgnoreCase(secondName);
-                    }
-                });
-
-                // create the custom intent list
-                for (ResolveInfo resolveInfo : resInfoListFiltered) {
-                    Intent targetedShareIntent = (Intent) prototype.clone();
-                    targetedShareIntent.setPackage(resolveInfo.activityInfo.packageName);
-                    targetedShareIntent.setClassName(resolveInfo.activityInfo.packageName, resolveInfo.activityInfo.name);
-
-                    LabeledIntent lIntent = new LabeledIntent(targetedShareIntent,
-                            resolveInfo.activityInfo.packageName,
-                            resolveInfo.loadLabel(mContext.getPackageManager()),
-                            resolveInfo.activityInfo.icon);
-                    targetedShareIntents.add(lIntent);
-                }
-
-                // Create chooser with only one Intent in it
-                Intent chooserIntent = Intent.createChooser(targetedShareIntents.remove(targetedShareIntents.size() - 1), title);
-                // append all other Intents
-                // TODO this line looks wrong?!
-                chooserIntent.putExtra(Intent.EXTRA_INITIAL_INTENTS, targetedShareIntents.toArray(new Parcelable[]{}));
-                return chooserIntent;
-            }
-
-        }
-
-        // fallback to Android's default chooser
-        return Intent.createChooser(prototype, title);
-    }
-}