diff options
Diffstat (limited to 'OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/PgpDecryptVerify.java')
| -rw-r--r-- | OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/PgpDecryptVerify.java | 353 |
1 files changed, 243 insertions, 110 deletions
diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/PgpDecryptVerify.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/PgpDecryptVerify.java index 5589a3521..2ba0b6231 100644 --- a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/PgpDecryptVerify.java +++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/PgpDecryptVerify.java @@ -29,7 +29,6 @@ import org.spongycastle.openpgp.PGPEncryptedData; import org.spongycastle.openpgp.PGPEncryptedDataList; import org.spongycastle.openpgp.PGPException; import org.spongycastle.openpgp.PGPLiteralData; -import org.spongycastle.openpgp.PGPObjectFactory; import org.spongycastle.openpgp.PGPOnePassSignature; import org.spongycastle.openpgp.PGPOnePassSignatureList; import org.spongycastle.openpgp.PGPPBEEncryptedData; @@ -37,10 +36,10 @@ 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.PublicKeyDataDecryptorFactory; -import org.spongycastle.openpgp.operator.jcajce.JcaKeyFingerprintCalculator; import org.spongycastle.openpgp.operator.jcajce.JcaPGPContentVerifierBuilderProvider; import org.spongycastle.openpgp.operator.jcajce.JcaPGPDigestCalculatorProviderBuilder; import org.spongycastle.openpgp.operator.jcajce.JcePBEDataDecryptorFactoryBuilder; @@ -55,6 +54,9 @@ import org.sufficientlysecure.keychain.provider.ProviderHelper; import org.sufficientlysecure.keychain.operations.results.DecryptVerifyResult; import org.sufficientlysecure.keychain.operations.results.OperationResult.LogType; import org.sufficientlysecure.keychain.operations.results.OperationResult.OperationLog; +import org.sufficientlysecure.keychain.pgp.exception.PgpGeneralException; +import org.sufficientlysecure.keychain.provider.KeychainContract.KeyRings; +import org.sufficientlysecure.keychain.provider.ProviderHelper; import org.sufficientlysecure.keychain.ui.util.KeyFormattingUtils; import org.sufficientlysecure.keychain.util.InputData; import org.sufficientlysecure.keychain.util.Log; @@ -85,10 +87,11 @@ public class PgpDecryptVerify extends BaseOperation { private Set<Long> mAllowedKeyIds; private boolean mDecryptMetadataOnly; private byte[] mDecryptedSessionKey; + private byte[] mDetachedSignature; private String mRequiredSignerFingerprint; private boolean mSignedLiteralData; - private PgpDecryptVerify(Builder builder) { + protected PgpDecryptVerify(Builder builder) { super(builder.mContext, builder.mProviderHelper, builder.mProgressable); // private Constructor can only be called from Builder @@ -100,6 +103,7 @@ public class PgpDecryptVerify extends BaseOperation { this.mAllowedKeyIds = builder.mAllowedKeyIds; this.mDecryptMetadataOnly = builder.mDecryptMetadataOnly; this.mDecryptedSessionKey = builder.mDecryptedSessionKey; + this.mDetachedSignature = builder.mDetachedSignature; this.mSignedLiteralData = builder.mSignedLiteralData; this.mRequiredSignerFingerprint = builder.mRequiredSignerFingerprint; } @@ -109,15 +113,16 @@ public class PgpDecryptVerify extends BaseOperation { private Context mContext; private ProviderHelper mProviderHelper; private InputData mData; - private OutputStream mOutStream; // optional + private OutputStream mOutStream = null; private Progressable mProgressable = null; private boolean mAllowSymmetricDecryption = true; private String mPassphrase = null; private Set<Long> mAllowedKeyIds = null; private boolean mDecryptMetadataOnly = false; private byte[] mDecryptedSessionKey = null; + private byte[] mDetachedSignature = null; private String mRequiredSignerFingerprint = null; private boolean mSignedLiteralData = false; @@ -182,6 +187,14 @@ public class PgpDecryptVerify extends BaseOperation { return this; } + /** + * If detachedSignature != null, it will be used exclusively to verify the signature + */ + public Builder setDetachedSignature(byte[] detachedSignature) { + mDetachedSignature = detachedSignature; + return this; + } + public PgpDecryptVerify build() { return new PgpDecryptVerify(this); } @@ -192,24 +205,32 @@ public class PgpDecryptVerify extends BaseOperation { */ public DecryptVerifyResult execute() { try { - // automatically works with ascii armor input and binary - InputStream in = PGPUtil.getDecoderStream(mData.getInputStream()); - - if (in instanceof ArmoredInputStream) { - ArmoredInputStream aIn = (ArmoredInputStream) in; - // it is ascii armored - Log.d(Constants.TAG, "ASCII Armor Header Line: " + aIn.getArmorHeaderLine()); - - if (mSignedLiteralData) { - return verifySignedLiteralData(aIn, 0); - } else if (aIn.isClearText()) { - // a cleartext signature, verify it with the other method - return verifyCleartextSignature(aIn, 0); + if (mDetachedSignature != null) { + Log.d(Constants.TAG, "Detached signature present, verifying with this signature only"); + + return verifyDetachedSignature(mData.getInputStream(), 0); + } else { + // automatically works with PGP ascii armor and PGP binary + InputStream in = PGPUtil.getDecoderStream(mData.getInputStream()); + + if (in instanceof ArmoredInputStream) { + ArmoredInputStream aIn = (ArmoredInputStream) in; + // it is ascii armored + Log.d(Constants.TAG, "ASCII Armor Header Line: " + aIn.getArmorHeaderLine()); + + if (mSignedLiteralData) { + return verifySignedLiteralData(aIn, 0); + } else if (aIn.isClearText()) { + // a cleartext signature, verify it with the other method + return verifyCleartextSignature(aIn, 0); + } else { + // else: ascii armored encryption! go on... + return decryptVerify(in, 0); + } + } else { + return decryptVerify(in, 0); } - // else: ascii armored encryption! go on... } - - return decryptVerify(in, 0); } catch (PGPException e) { Log.d(Constants.TAG, "PGPException", e); OperationLog log = new OperationLog(); @@ -233,12 +254,12 @@ public class PgpDecryptVerify extends BaseOperation { // thinking that the proof-fetching operation is going to take most of the time updateProgress(R.string.progress_reading_data, 75, 100); - PGPObjectFactory pgpF = new PGPObjectFactory(in, new JcaKeyFingerprintCalculator()); + JcaPGPObjectFactory pgpF = new JcaPGPObjectFactory(in); Object o = pgpF.nextObject(); if (o instanceof PGPCompressedData) { log.add(LogType.MSG_DC_CLEAR_DECOMPRESS, indent + 1); - pgpF = new PGPObjectFactory(((PGPCompressedData) o).getDataStream(), new JcaKeyFingerprintCalculator()); + pgpF = new JcaPGPObjectFactory(((PGPCompressedData) o).getDataStream()); o = pgpF.nextObject(); updateProgress(R.string.progress_decompressing_data, 80, 100); } @@ -363,7 +384,7 @@ public class PgpDecryptVerify extends BaseOperation { log.add(LogType.MSG_DC, indent); indent += 1; - PGPObjectFactory pgpF = new PGPObjectFactory(in, new JcaKeyFingerprintCalculator()); + JcaPGPObjectFactory pgpF = new JcaPGPObjectFactory(in); PGPEncryptedDataList enc; Object o = pgpF.nextObject(); @@ -392,6 +413,25 @@ public class PgpDecryptVerify extends BaseOperation { boolean symmetricPacketFound = false; boolean anyPacketFound = false; + // If the input stream is armored, and there is a charset specified, take a note for later + // https://tools.ietf.org/html/rfc4880#page56 + String charset = null; + if (in instanceof ArmoredInputStream) { + ArmoredInputStream aIn = (ArmoredInputStream) in; + if (aIn.getArmorHeaders() != null) { + for (String header : aIn.getArmorHeaders()) { + String[] pieces = header.split(":", 2); + if (pieces.length == 2 && "charset".equalsIgnoreCase(pieces[0])) { + charset = pieces[1].trim(); + break; + } + } + if (charset != null) { + log.add(LogType.MSG_DC_CHARSET, indent, charset); + } + } + } + // go through all objects and find one we can decrypt while (it.hasNext()) { Object obj = it.next(); @@ -415,19 +455,19 @@ public class PgpDecryptVerify extends BaseOperation { ); } catch (ProviderHelper.NotFoundException e) { // continue with the next packet in the while loop - log.add(LogType.MSG_DC_ASKIP_NO_KEY, indent +1); + 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); + log.add(LogType.MSG_DC_ASKIP_NO_KEY, indent + 1); continue; } // 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); + log.add(LogType.MSG_DC_ASKIP_NO_KEY, indent + 1); continue; } @@ -441,7 +481,7 @@ public class PgpDecryptVerify extends BaseOperation { if (!mAllowedKeyIds.contains(masterKeyId)) { // this key is in our db, but NOT allowed! // continue with the next packet in the while loop - log.add(LogType.MSG_DC_ASKIP_NOT_ALLOWED, indent +1); + log.add(LogType.MSG_DC_ASKIP_NOT_ALLOWED, indent + 1); continue; } } @@ -456,15 +496,15 @@ public class PgpDecryptVerify extends BaseOperation { try { // returns "" if key has no passphrase mPassphrase = getCachedPassphrase(subKeyId); - log.add(LogType.MSG_DC_PASS_CACHED, indent +1); + log.add(LogType.MSG_DC_PASS_CACHED, indent + 1); } catch (PassphraseCacheInterface.NoSecretKeyException e) { - log.add(LogType.MSG_DC_ERROR_NO_KEY, indent +1); + log.add(LogType.MSG_DC_ERROR_NO_KEY, indent + 1); return new DecryptVerifyResult(DecryptVerifyResult.RESULT_ERROR, log); } // if passphrase was not cached, return here indicating that a passphrase is missing! if (mPassphrase == null) { - log.add(LogType.MSG_DC_PENDING_PASSPHRASE, indent +1); + log.add(LogType.MSG_DC_PENDING_PASSPHRASE, indent + 1); DecryptVerifyResult result = new DecryptVerifyResult(DecryptVerifyResult.RESULT_PENDING_ASYM_PASSPHRASE, log); result.setKeyIdPassphraseNeeded(subKeyId); @@ -480,8 +520,8 @@ public class PgpDecryptVerify extends BaseOperation { log.add(LogType.MSG_DC_SYM, indent); - if (! mAllowSymmetricDecryption) { - log.add(LogType.MSG_DC_SYM_SKIP, indent +1); + if (!mAllowSymmetricDecryption) { + log.add(LogType.MSG_DC_SYM_SKIP, indent + 1); continue; } @@ -496,7 +536,7 @@ public class PgpDecryptVerify extends BaseOperation { // if no passphrase is given, return here // indicating that a passphrase is missing! if (mPassphrase == null) { - log.add(LogType.MSG_DC_PENDING_PASSPHRASE, indent +1); + log.add(LogType.MSG_DC_PENDING_PASSPHRASE, indent + 1); return new DecryptVerifyResult(DecryptVerifyResult.RESULT_PENDING_SYM_PASSPHRASE, log); } @@ -541,13 +581,13 @@ public class PgpDecryptVerify extends BaseOperation { updateProgress(R.string.progress_extracting_key, currentProgress, 100); try { - log.add(LogType.MSG_DC_UNLOCKING, indent +1); + log.add(LogType.MSG_DC_UNLOCKING, indent + 1); if (!secretEncryptionKey.unlock(mPassphrase)) { - log.add(LogType.MSG_DC_ERROR_BAD_PASSPHRASE, indent +1); + log.add(LogType.MSG_DC_ERROR_BAD_PASSPHRASE, indent + 1); return new DecryptVerifyResult(DecryptVerifyResult.RESULT_ERROR, log); } } catch (PgpGeneralException e) { - log.add(LogType.MSG_DC_ERROR_EXTRACT_KEY, indent +1); + log.add(LogType.MSG_DC_ERROR_EXTRACT_KEY, indent + 1); return new DecryptVerifyResult(DecryptVerifyResult.RESULT_ERROR, log); } @@ -559,7 +599,7 @@ public class PgpDecryptVerify extends BaseOperation { = secretEncryptionKey.getDecryptorFactory(mDecryptedSessionKey); clear = encryptedDataAsymmetric.getDataStream(decryptorFactory); } catch (NfcSyncPublicKeyDataDecryptorFactoryBuilder.NfcInteractionNeeded e) { - log.add(LogType.MSG_DC_PENDING_NFC, indent +1); + log.add(LogType.MSG_DC_PENDING_NFC, indent + 1); DecryptVerifyResult result = new DecryptVerifyResult(DecryptVerifyResult.RESULT_PENDING_NFC, log); result.setNfcState(secretEncryptionKey.getKeyId(), e.encryptedSessionKey, mPassphrase); @@ -570,11 +610,11 @@ public class PgpDecryptVerify extends BaseOperation { // If we didn't find any useful data, error out // no packet has been found where we have the corresponding secret key in our db log.add( - anyPacketFound ? LogType.MSG_DC_ERROR_NO_KEY : LogType.MSG_DC_ERROR_NO_DATA, indent +1); + anyPacketFound ? LogType.MSG_DC_ERROR_NO_KEY : LogType.MSG_DC_ERROR_NO_DATA, indent + 1); return new DecryptVerifyResult(DecryptVerifyResult.RESULT_ERROR, log); } - PGPObjectFactory plainFact = new PGPObjectFactory(clear, new JcaKeyFingerprintCalculator()); + JcaPGPObjectFactory plainFact = new JcaPGPObjectFactory(clear); Object dataChunk = plainFact.nextObject(); OpenPgpSignatureResultBuilder signatureResultBuilder = new OpenPgpSignatureResultBuilder(); int signatureIndex = -1; @@ -585,25 +625,27 @@ public class PgpDecryptVerify extends BaseOperation { indent += 1; if (dataChunk instanceof PGPCompressedData) { - log.add(LogType.MSG_DC_CLEAR_DECOMPRESS, indent +1); + log.add(LogType.MSG_DC_CLEAR_DECOMPRESS, indent + 1); currentProgress += 2; updateProgress(R.string.progress_decompressing_data, currentProgress, 100); PGPCompressedData compressedData = (PGPCompressedData) dataChunk; - PGPObjectFactory fact = new PGPObjectFactory(compressedData.getDataStream(), new JcaKeyFingerprintCalculator()); + JcaPGPObjectFactory fact = new JcaPGPObjectFactory(compressedData.getDataStream()); dataChunk = fact.nextObject(); plainFact = fact; } PGPOnePassSignature signature = null; if (dataChunk instanceof PGPOnePassSignatureList) { - log.add(LogType.MSG_DC_CLEAR_SIGNATURE, indent +1); + 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) { @@ -649,19 +691,15 @@ public class PgpDecryptVerify extends BaseOperation { OpenPgpMetadata metadata; if (dataChunk instanceof PGPLiteralData) { - log.add(LogType.MSG_DC_CLEAR_DATA, indent +1); + log.add(LogType.MSG_DC_CLEAR_DATA, indent + 1); indent += 2; currentProgress += 4; updateProgress(R.string.progress_decrypting, currentProgress, 100); PGPLiteralData literalData = (PGPLiteralData) dataChunk; - // TODO: how to get the real original size? - // this is the encrypted size so if we enable compression this value is wrong! - long originalSize = mData.getSize() - mData.getStreamPosition(); - if (originalSize < 0) { - originalSize = 0; - } + // reported size may be null if partial packets are involved (highly unlikely though) + Long originalSize = literalData.getDataLengthIfAvailable(); String originalFilename = literalData.getFileName(); String mimeType = null; @@ -689,18 +727,20 @@ public class PgpDecryptVerify extends BaseOperation { originalFilename, mimeType, literalData.getModificationTime().getTime(), - originalSize); + originalSize == null ? 0 : originalSize); - if ( ! originalFilename.equals("")) { + if (!"".equals(originalFilename)) { log.add(LogType.MSG_DC_CLEAR_META_FILE, indent + 1, originalFilename); } - log.add(LogType.MSG_DC_CLEAR_META_MIME, indent +1, + log.add(LogType.MSG_DC_CLEAR_META_MIME, indent + 1, mimeType); - log.add(LogType.MSG_DC_CLEAR_META_TIME, indent +1, + log.add(LogType.MSG_DC_CLEAR_META_TIME, indent + 1, new Date(literalData.getModificationTime().getTime()).toString()); - if (originalSize != 0) { + if (originalSize != null) { log.add(LogType.MSG_DC_CLEAR_META_SIZE, indent + 1, Long.toString(originalSize)); + } else { + log.add(LogType.MSG_DC_CLEAR_META_SIZE_UNKNOWN, indent + 1); } // return here if we want to decrypt the metadata only @@ -708,6 +748,7 @@ public class PgpDecryptVerify extends BaseOperation { log.add(LogType.MSG_DC_OK_META_ONLY, indent); DecryptVerifyResult result = new DecryptVerifyResult(DecryptVerifyResult.RESULT_OK, log); + result.setCharset(charset); result.setDecryptMetadata(metadata); return result; } @@ -730,7 +771,10 @@ public class PgpDecryptVerify extends BaseOperation { int length; byte[] buffer = new byte[1 << 16]; while ((length = dataIn.read(buffer)) > 0) { - mOutStream.write(buffer, 0, length); + Log.d(Constants.TAG, "read bytes: " + length); + if (mOutStream != null) { + mOutStream.write(buffer, 0, length); + } // update signature buffer if signature is also present if (signature != null) { @@ -745,9 +789,8 @@ public class PgpDecryptVerify extends BaseOperation { progress = 100; } progressScaler.setProgress((int) progress, 100); - } else { - // TODO: slow annealing to fake a progress? } + // TODO: slow annealing to fake a progress? } if (signature != null) { @@ -764,9 +807,9 @@ public class PgpDecryptVerify extends BaseOperation { // Verify signature and check binding signatures boolean validSignature = signature.verify(messageSignature); if (validSignature) { - log.add(LogType.MSG_DC_CLEAR_SIGNATURE_OK, indent +1); + log.add(LogType.MSG_DC_CLEAR_SIGNATURE_OK, indent + 1); } else { - log.add(LogType.MSG_DC_CLEAR_SIGNATURE_BAD, indent +1); + log.add(LogType.MSG_DC_CLEAR_SIGNATURE_BAD, indent + 1); } signatureResultBuilder.setValidSignature(validSignature); } @@ -777,8 +820,6 @@ public class PgpDecryptVerify extends BaseOperation { metadata = null; } - OpenPgpSignatureResult signatureResult = signatureResultBuilder.build(); - if (encryptedData.isIntegrityProtected()) { updateProgress(R.string.progress_verifying_integrity, 95, 100); @@ -792,9 +833,9 @@ public class PgpDecryptVerify extends BaseOperation { // If no valid signature is present: // Handle missing integrity protection like failed integrity protection! // The MDC packet can be stripped by an attacker! - if (signatureResult.getStatus() != OpenPgpSignatureResult.SIGNATURE_SUCCESS_CERTIFIED - && signatureResult.getStatus() != OpenPgpSignatureResult.SIGNATURE_SUCCESS_UNCERTIFIED) { - log.add(LogType.MSG_DC_ERROR_INTEGRITY_CHECK, indent); + Log.d(Constants.TAG, "MDC fail"); + if (!signatureResultBuilder.isValidSignature()) { + log.add(LogType.MSG_DC_ERROR_INTEGRITY_MISSING, indent); return new DecryptVerifyResult(DecryptVerifyResult.RESULT_ERROR, log); } } @@ -807,7 +848,8 @@ public class PgpDecryptVerify extends BaseOperation { DecryptVerifyResult result = new DecryptVerifyResult(DecryptVerifyResult.RESULT_OK, log); result.setDecryptMetadata(metadata); - result.setSignatureResult(signatureResult); + result.setSignatureResult(signatureResultBuilder.build()); + result.setCharset(charset); return result; } @@ -830,7 +872,7 @@ public class PgpDecryptVerify extends BaseOperation { ByteArrayOutputStream out = new ByteArrayOutputStream(); - updateProgress(R.string.progress_done, 0, 100); + updateProgress(R.string.progress_reading_data, 0, 100); ByteArrayOutputStream lineOut = new ByteArrayOutputStream(); int lookAhead = readInputLine(lineOut, aIn); @@ -850,10 +892,12 @@ public class PgpDecryptVerify extends BaseOperation { out.close(); byte[] clearText = out.toByteArray(); - mOutStream.write(clearText); + if (mOutStream != null) { + mOutStream.write(clearText); + } updateProgress(R.string.progress_processing_signature, 60, 100); - PGPObjectFactory pgpFact = new PGPObjectFactory(aIn, new JcaKeyFingerprintCalculator()); + JcaPGPObjectFactory pgpFact = new JcaPGPObjectFactory(aIn); PGPSignatureList sigList = (PGPSignatureList) pgpFact.nextObject(); if (sigList == null) { @@ -861,45 +905,7 @@ public class PgpDecryptVerify extends BaseOperation { return new DecryptVerifyResult(DecryptVerifyResult.RESULT_ERROR, log); } - 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()); - } - } + PGPSignature signature = processPGPSignatureList(sigList, signatureResultBuilder); if (signature != null) { try { @@ -947,6 +953,133 @@ public class PgpDecryptVerify extends BaseOperation { return result; } + private DecryptVerifyResult verifyDetachedSignature(InputStream in, int indent) + throws IOException, PGPException { + + OperationLog log = new OperationLog(); + + OpenPgpSignatureResultBuilder signatureResultBuilder = new OpenPgpSignatureResultBuilder(); + // detached signatures are never encrypted + signatureResultBuilder.setSignatureOnly(true); + + updateProgress(R.string.progress_processing_signature, 0, 100); + InputStream detachedSigIn = new ByteArrayInputStream(mDetachedSignature); + 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 { + log.add(LogType.MSG_DC_ERROR_INVALID_SIGLIST, 0); + return new DecryptVerifyResult(DecryptVerifyResult.RESULT_ERROR, log); + } + + PGPSignature signature = processPGPSignatureList(sigList, signatureResultBuilder); + + if (signature != null) { + updateProgress(R.string.progress_reading_data, 60, 100); + + ProgressScaler progressScaler = new ProgressScaler(mProgressable, 60, 90, 100); + long alreadyWritten = 0; + long wholeSize = mData.getSize() - mData.getStreamPosition(); + int length; + byte[] buffer = new byte[1 << 16]; + while ((length = in.read(buffer)) > 0) { + if (mOutStream != null) { + mOutStream.write(buffer, 0, length); + } + + // update signature buffer if signature is also present + signature.update(buffer, 0, length); + + alreadyWritten += length; + if (wholeSize > 0) { + long progress = 100 * alreadyWritten / wholeSize; + // stop at 100% for wrong file sizes... + if (progress > 100) { + progress = 100; + } + 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); + + // these are not cleartext signatures! + signatureResultBuilder.setSignatureOnly(false); + + // 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); + } + signatureResultBuilder.setValidSignature(validSignature); + } + + updateProgress(R.string.progress_done, 100, 100); + + log.add(LogType.MSG_DC_OK, indent); + + DecryptVerifyResult result = new DecryptVerifyResult(DecryptVerifyResult.RESULT_OK, log); + result.setSignatureResult(signatureResultBuilder.build()); + return result; + } + + private PGPSignature processPGPSignatureList(PGPSignatureList sigList, OpenPgpSignatureResultBuilder signatureResultBuilder) 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()); + } + } + + return signature; + } + /** * Mostly taken from ClearSignedFileProcessor in Bouncy Castle */ @@ -968,7 +1101,7 @@ public class PgpDecryptVerify extends BaseOperation { while ((ch = fIn.read()) >= 0) { bOut.write(ch); if (ch == '\r' || ch == '\n') { - lookAhead = readPassedEOL(bOut, ch, fIn); + lookAhead = readPastEOL(bOut, ch, fIn); break; } } @@ -985,7 +1118,7 @@ public class PgpDecryptVerify extends BaseOperation { do { bOut.write(ch); if (ch == '\r' || ch == '\n') { - lookAhead = readPassedEOL(bOut, ch, fIn); + lookAhead = readPastEOL(bOut, ch, fIn); break; } } while ((ch = fIn.read()) >= 0); @@ -997,7 +1130,7 @@ public class PgpDecryptVerify extends BaseOperation { return lookAhead; } - private static int readPassedEOL(ByteArrayOutputStream bOut, int lastCh, InputStream fIn) + private static int readPastEOL(ByteArrayOutputStream bOut, int lastCh, InputStream fIn) throws IOException { int lookAhead = fIn.read(); |