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introduce CachingDataDecryptorFactory towards cached session keys

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this commit introduces the CachingDataDecryptorFactory, which wraps
a DataDecryptorFactory but supports caching of decrypted session keys.

this change also gets rid of runtimeexception based control flow in
PgpDecryptVerify.
This commit is contained in:
Vincent Breitmoser
2015-06-01 00:05:55 +02:00
parent 403f74f558
commit dbfa55f6b9
8 changed files with 145 additions and 319 deletions
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23
OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/CanonicalizedSecretKey.java
View File

@@ -21,23 +21,18 @@ package org.sufficientlysecure.keychain.pgp;
import org.spongycastle.bcpg.S2K;
import org.spongycastle.openpgp.PGPException;
import org.spongycastle.openpgp.PGPPrivateKey;
import org.spongycastle.openpgp.PGPPublicKey;
import org.spongycastle.openpgp.PGPPublicKeyRing;
import org.spongycastle.openpgp.PGPSecretKey;
import org.spongycastle.openpgp.PGPSignature;
import org.spongycastle.openpgp.PGPSignatureGenerator;
import org.spongycastle.openpgp.PGPSignatureSubpacketGenerator;
import org.spongycastle.openpgp.PGPSignatureSubpacketVector;
import org.spongycastle.openpgp.PGPUserAttributeSubpacketVector;
import org.spongycastle.openpgp.operator.PBESecretKeyDecryptor;
import org.spongycastle.openpgp.operator.PGPContentSignerBuilder;
import org.spongycastle.openpgp.operator.PublicKeyDataDecryptorFactory;
import org.spongycastle.openpgp.operator.jcajce.CachingDataDecryptorFactory;
import org.spongycastle.openpgp.operator.jcajce.JcaPGPContentSignerBuilder;
import org.spongycastle.openpgp.operator.jcajce.JcaPGPKeyConverter;
import org.spongycastle.openpgp.operator.jcajce.JcePBESecretKeyDecryptorBuilder;
import org.spongycastle.openpgp.operator.jcajce.JcePublicKeyDataDecryptorFactoryBuilder;
import org.spongycastle.openpgp.operator.jcajce.NfcSyncPGPContentSignerBuilder;
import org.spongycastle.openpgp.operator.jcajce.NfcSyncPublicKeyDataDecryptorFactoryBuilder;
import org.sufficientlysecure.keychain.Constants;
import org.sufficientlysecure.keychain.pgp.exception.PgpGeneralException;
import org.sufficientlysecure.keychain.pgp.exception.PgpKeyNotFoundException;
@@ -51,7 +46,6 @@ import java.security.interfaces.RSAPrivateCrtKey;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
@@ -270,19 +264,20 @@ public class CanonicalizedSecretKey extends CanonicalizedPublicKey {
}
}
public PublicKeyDataDecryptorFactory getDecryptorFactory(CryptoInputParcel cryptoInput) {
public CachingDataDecryptorFactory getCachingDecryptorFactory(CryptoInputParcel cryptoInput) {
if (mPrivateKeyState == PRIVATE_KEY_STATE_LOCKED) {
throw new PrivateKeyNotUnlockedException();
}
if (mPrivateKeyState == PRIVATE_KEY_STATE_DIVERT_TO_CARD) {
return new NfcSyncPublicKeyDataDecryptorFactoryBuilder()
.setProvider(Constants.BOUNCY_CASTLE_PROVIDER_NAME).build(
cryptoInput.getCryptoData()
);
return new CachingDataDecryptorFactory(
Constants.BOUNCY_CASTLE_PROVIDER_NAME,
cryptoInput.getCryptoData());
} else {
return new JcePublicKeyDataDecryptorFactoryBuilder()
.setProvider(Constants.BOUNCY_CASTLE_PROVIDER_NAME).build(mPrivateKey);
return new CachingDataDecryptorFactory(
new JcePublicKeyDataDecryptorFactoryBuilder()
.setProvider(Constants.BOUNCY_CASTLE_PROVIDER_NAME).build(mPrivateKey),
cryptoInput.getCryptoData());
}
}

38
OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/PgpDecryptVerify.java
View File

@@ -24,6 +24,7 @@ import android.webkit.MimeTypeMap;
import org.openintents.openpgp.OpenPgpMetadata;
import org.openintents.openpgp.OpenPgpSignatureResult;
import org.spongycastle.bcpg.ArmoredInputStream;
import org.spongycastle.bcpg.PublicKeyEncSessionPacket;
import org.spongycastle.openpgp.PGPCompressedData;
import org.spongycastle.openpgp.PGPEncryptedData;
import org.spongycastle.openpgp.PGPEncryptedDataList;
@@ -40,11 +41,10 @@ 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.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.openpgp.operator.jcajce.NfcSyncPublicKeyDataDecryptorFactoryBuilder;
import org.sufficientlysecure.keychain.Constants;
import org.sufficientlysecure.keychain.R;
import org.sufficientlysecure.keychain.operations.BaseOperation;
@@ -541,24 +541,33 @@ public class PgpDecryptVerify extends BaseOperation {
currentProgress += 2;
updateProgress(R.string.progress_preparing_streams, currentProgress, 100);
try {
PublicKeyDataDecryptorFactory decryptorFactory
= secretEncryptionKey.getDecryptorFactory(cryptoInput);
try {
clear = encryptedDataAsymmetric.getDataStream(decryptorFactory);
} catch (PGPKeyValidationException | ArrayIndexOutOfBoundsException e) {
log.add(LogType.MSG_DC_ERROR_CORRUPT_DATA, indent + 1);
return new DecryptVerifyResult(DecryptVerifyResult.RESULT_ERROR, log);
}
CachingDataDecryptorFactory decryptorFactory
= secretEncryptionKey.getCachingDecryptorFactory(cryptoInput);
// special case: if the decryptor does not have a session key cached for this encrypted
// data, and can't actually decrypt on its own, return a pending intent
if (!decryptorFactory.canDecrypt()
&& !decryptorFactory.hasCachedSessionData(encryptedDataAsymmetric)) {
symmetricEncryptionAlgo = encryptedDataAsymmetric.getSymmetricAlgorithm(decryptorFactory);
} catch (NfcSyncPublicKeyDataDecryptorFactoryBuilder.NfcInteractionNeeded e) {
log.add(LogType.MSG_DC_PENDING_NFC, indent + 1);
return new DecryptVerifyResult(log, RequiredInputParcel.createNfcDecryptOperation(
secretEncryptionKey.getRing().getMasterKeyId(),
secretEncryptionKey.getKeyId(), e.encryptedSessionKey
secretEncryptionKey.getKeyId(), encryptedDataAsymmetric.getSessionKey()[0]
));
}
try {
clear = encryptedDataAsymmetric.getDataStream(decryptorFactory);
} catch (PGPKeyValidationException | ArrayIndexOutOfBoundsException e) {
log.add(LogType.MSG_DC_ERROR_CORRUPT_DATA, indent + 1);
return new DecryptVerifyResult(DecryptVerifyResult.RESULT_ERROR, log);
}
symmetricEncryptionAlgo = encryptedDataAsymmetric.getSymmetricAlgorithm(decryptorFactory);
cryptoInput.addCryptoData(decryptorFactory.getCachedSessionKeys());
encryptedData = encryptedDataAsymmetric;
} else {
// there wasn't even any useful data
@@ -821,6 +830,7 @@ public class PgpDecryptVerify extends BaseOperation {
// Return a positive result, with metadata and verification info
DecryptVerifyResult result =
new DecryptVerifyResult(DecryptVerifyResult.RESULT_OK, log);
result.setCachedCryptoInputParcel(cryptoInput);
result.setDecryptMetadata(metadata);
result.setSignatureResult(signatureResultBuilder.build());
result.setCharset(charset);