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package org.sufficientlysecure.keychain.pgp;
import org.spongycastle.bcpg.SignatureSubpacket;
import org.spongycastle.bcpg.SignatureSubpacketTags;
import org.spongycastle.bcpg.sig.RevocationReason;
import org.spongycastle.openpgp.PGPException;
import org.spongycastle.openpgp.PGPObjectFactory;
import org.spongycastle.openpgp.PGPPublicKey;
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.pgp.exception.PgpGeneralException;
import org.sufficientlysecure.keychain.util.Log;
import java.io.IOException;
import java.security.SignatureException;
import java.util.ArrayList;
import java.util.Date;
/** OpenKeychain wrapper around PGPSignature objects.
*
* This is a mostly simple wrapper around a single bouncycastle PGPSignature
* object. It exposes high level getters for all relevant information, methods
* for verification of various signatures (uid binding, subkey binding, generic
* bytes), and a static method for construction from bytes.
*
*/
public class WrappedSignature {
public static final int DEFAULT_CERTIFICATION = PGPSignature.DEFAULT_CERTIFICATION;
public static final int NO_CERTIFICATION = PGPSignature.NO_CERTIFICATION;
public static final int CASUAL_CERTIFICATION = PGPSignature.CASUAL_CERTIFICATION;
public static final int POSITIVE_CERTIFICATION = PGPSignature.POSITIVE_CERTIFICATION;
public static final int CERTIFICATION_REVOCATION = PGPSignature.CERTIFICATION_REVOCATION;
final PGPSignature mSig;
WrappedSignature(PGPSignature sig) {
mSig = sig;
}
public long getKeyId() {
return mSig.getKeyID();
}
public int getSignatureType() {
return mSig.getSignatureType();
}
public int getKeyAlgorithm() {
return mSig.getKeyAlgorithm();
}
public Date getCreationTime() {
return mSig.getCreationTime();
}
public ArrayList<WrappedSignature> getEmbeddedSignatures() {
ArrayList<WrappedSignature> sigs = new ArrayList<WrappedSignature>();
if (!mSig.hasSubpackets()) {
return sigs;
}
try {
PGPSignatureList list;
list = mSig.getHashedSubPackets().getEmbeddedSignatures();
for(int i = 0; i < list.size(); i++) {
sigs.add(new WrappedSignature(list.get(i)));
}
list = mSig.getUnhashedSubPackets().getEmbeddedSignatures();
for(int i = 0; i < list.size(); i++) {
sigs.add(new WrappedSignature(list.get(i)));
}
} catch (PGPException e) {
// no matter
Log.e(Constants.TAG, "exception reading embedded signatures", e);
} catch (IOException e) {
// no matter
Log.e(Constants.TAG, "exception reading embedded signatures", e);
}
return sigs;
}
public byte[] getEncoded() throws IOException {
return mSig.getEncoded();
}
public boolean isRevocation() {
return mSig.getHashedSubPackets().hasSubpacket(SignatureSubpacketTags.REVOCATION_REASON);
}
public boolean isPrimaryUserId() {
return mSig.getHashedSubPackets().isPrimaryUserID();
}
public String getRevocationReason() throws PgpGeneralException {
if(!isRevocation()) {
throw new PgpGeneralException("Not a revocation signature.");
}
SignatureSubpacket p = mSig.getHashedSubPackets().getSubpacket(
SignatureSubpacketTags.REVOCATION_REASON);
// For some reason, this is missing in SignatureSubpacketInputStream:146
if (!(p instanceof RevocationReason)) {
p = new RevocationReason(false, p.getData());
}
return ((RevocationReason) p).getRevocationDescription();
}
public void init(WrappedPublicKey key) throws PgpGeneralException {
init(key.getPublicKey());
}
public void init(UncachedPublicKey key) throws PgpGeneralException {
init(key.getPublicKey());
}
void init(PGPPublicKey key) throws PgpGeneralException {
try {
JcaPGPContentVerifierBuilderProvider contentVerifierBuilderProvider =
new JcaPGPContentVerifierBuilderProvider()
.setProvider(Constants.BOUNCY_CASTLE_PROVIDER_NAME);
mSig.init(contentVerifierBuilderProvider, key);
} catch(PGPException e) {
throw new PgpGeneralException(e);
}
}
public void update(byte[] data, int offset, int length) throws PgpGeneralException {
try {
mSig.update(data, offset, length);
} catch(SignatureException e) {
throw new PgpGeneralException(e);
}
}
public void update(byte data) throws PgpGeneralException {
try {
mSig.update(data);
} catch(SignatureException e) {
throw new PgpGeneralException(e);
}
}
public boolean verify() throws PgpGeneralException {
try {
return mSig.verify();
} catch(SignatureException e) {
throw new PgpGeneralException(e);
} catch(PGPException e) {
throw new PgpGeneralException(e);
}
}
boolean verifySignature(PGPPublicKey key) throws PgpGeneralException {
try {
return mSig.verifyCertification(key);
} catch (SignatureException e) {
throw new PgpGeneralException("Sign!", e);
} catch (PGPException e) {
throw new PgpGeneralException("Error!", e);
}
}
boolean verifySignature(PGPPublicKey masterKey, PGPPublicKey subKey) throws PgpGeneralException {
try {
return mSig.verifyCertification(masterKey, subKey);
} catch (SignatureException e) {
throw new PgpGeneralException("Sign!", e);
} catch (PGPException e) {
throw new PgpGeneralException("Error!", e);
}
}
boolean verifySignature(PGPPublicKey key, String uid) throws PgpGeneralException {
try {
return mSig.verifyCertification(uid, key);
} catch (SignatureException e) {
throw new PgpGeneralException("Error!", e);
} catch (PGPException e) {
throw new PgpGeneralException("Error!", e);
}
}
public boolean verifySignature(UncachedPublicKey key, String uid) throws PgpGeneralException {
return verifySignature(key.getPublicKey(), uid);
}
public boolean verifySignature(WrappedPublicKey key, String uid) throws PgpGeneralException {
return verifySignature(key.getPublicKey(), uid);
}
public static WrappedSignature fromBytes(byte[] data) {
PGPObjectFactory factory = new PGPObjectFactory(data);
PGPSignatureList signatures = null;
try {
if ((signatures = (PGPSignatureList) factory.nextObject()) == null || signatures.isEmpty()) {
Log.e(Constants.TAG, "No signatures given!");
return null;
}
} catch (IOException e) {
Log.e(Constants.TAG, "Error while converting to PGPSignature!", e);
return null;
}
return new WrappedSignature(signatures.get(0));
}
public boolean isLocal() {
if (!mSig.hasSubpackets()
|| !mSig.getHashedSubPackets().hasSubpacket(SignatureSubpacketTags.EXPORTABLE)) {
return false;
}
SignatureSubpacket p = mSig.getHashedSubPackets().getSubpacket(SignatureSubpacketTags.EXPORTABLE);
return p.getData()[0] == 0;
}
}
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