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Code Issues Releases Wiki Activity

Implement custom decryptor factories in pda

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This commit is contained in:
Paul Schaub 2022-10-20 16:08:01 +02:00
parent a60917549d
commit 0d62cea8a5
1 changed files with 61 additions and 61 deletions
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122
pgpainless-core/src/main/java/org/pgpainless/decryption_verification/OpenPgpMessageInputStream.java
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@ -314,6 +314,20 @@ public class OpenPgpMessageInputStream extends DecryptionStream {
SortedESKs esks = new SortedESKs(encDataList);
// Try custom decryptor factory
for (SubkeyIdentifier subkeyIdentifier : options.getCustomDecryptorFactories().keySet()) {
PublicKeyDataDecryptorFactory decryptorFactory = options.getCustomDecryptorFactories().get(subkeyIdentifier);
for (PGPPublicKeyEncryptedData pkesk : esks.pkesks) {
if (pkesk.getKeyID() != subkeyIdentifier.getSubkeyId()) {
continue;
}
if (decryptPKESKAndStream(subkeyIdentifier, decryptorFactory, pkesk)) {
return true;
}
}
}
// Try session key
if (options.getSessionKey() != null) {
SessionKey sessionKey = options.getSessionKey();
@ -357,20 +371,8 @@ public class OpenPgpMessageInputStream extends DecryptionStream {
PBEDataDecryptorFactory decryptorFactory = ImplementationFactory.getInstance()
.getPBEDataDecryptorFactory(passphrase);
try {
InputStream decrypted = skesk.getDataStream(decryptorFactory);
SessionKey sessionKey = new SessionKey(skesk.getSessionKey(decryptorFactory));
throwIfUnacceptable(sessionKey.getAlgorithm());
MessageMetadata.EncryptedData encryptedData = new MessageMetadata.EncryptedData(
sessionKey.getAlgorithm(), metadata.depth + 1);
encryptedData.sessionKey = sessionKey;
IntegrityProtectedInputStream integrityProtected = new IntegrityProtectedInputStream(decrypted, skesk, options);
nestedInputStream = new OpenPgpMessageInputStream(buffer(integrityProtected), options, encryptedData, policy);
if (decryptSKESKAndStream(skesk, decryptorFactory)) {
return true;
} catch (UnacceptableAlgorithmException e) {
throw e;
} catch (PGPException e) {
// Password mismatch?
}
}
}
@ -393,28 +395,13 @@ public class OpenPgpMessageInputStream extends DecryptionStream {
}
PGPSecretKey decryptionKey = decryptionKeys.getSecretKey(keyId);
SubkeyIdentifier decryptionKeyId = new SubkeyIdentifier(decryptionKeys, decryptionKey.getKeyID());
PGPPrivateKey privateKey = UnlockSecretKey.unlockSecretKey(decryptionKey, protector);
PublicKeyDataDecryptorFactory decryptorFactory = ImplementationFactory.getInstance()
.getPublicKeyDataDecryptorFactory(privateKey);
try {
InputStream decrypted = pkesk.getDataStream(decryptorFactory);
SessionKey sessionKey = new SessionKey(pkesk.getSessionKey(decryptorFactory));
throwIfUnacceptable(sessionKey.getAlgorithm());
MessageMetadata.EncryptedData encryptedData = new MessageMetadata.EncryptedData(
SymmetricKeyAlgorithm.requireFromId(pkesk.getSymmetricAlgorithm(decryptorFactory)),
metadata.depth + 1);
encryptedData.decryptionKey = new SubkeyIdentifier(decryptionKeys, decryptionKey.getKeyID());
encryptedData.sessionKey = sessionKey;
IntegrityProtectedInputStream integrityProtected = new IntegrityProtectedInputStream(decrypted, pkesk, options);
nestedInputStream = new OpenPgpMessageInputStream(buffer(integrityProtected), options, encryptedData, policy);
if (decryptPKESKAndStream(decryptionKeyId, decryptorFactory, pkesk)) {
return true;
} catch (UnacceptableAlgorithmException e) {
throw e;
} catch (PGPException e) {
}
}
@ -430,23 +417,10 @@ public class OpenPgpMessageInputStream extends DecryptionStream {
PGPPrivateKey privateKey = UnlockSecretKey.unlockSecretKey(decryptionKeyCandidate.getB(), protector);
PublicKeyDataDecryptorFactory decryptorFactory = ImplementationFactory.getInstance()
.getPublicKeyDataDecryptorFactory(privateKey);
SubkeyIdentifier decryptionKeyId = new SubkeyIdentifier(decryptionKeyCandidate.getA(), privateKey.getKeyID());
try {
InputStream decrypted = pkesk.getDataStream(decryptorFactory);
SessionKey sessionKey = new SessionKey(pkesk.getSessionKey(decryptorFactory));
throwIfUnacceptable(sessionKey.getAlgorithm());
MessageMetadata.EncryptedData encryptedData = new MessageMetadata.EncryptedData(
SymmetricKeyAlgorithm.requireFromId(pkesk.getSymmetricAlgorithm(decryptorFactory)),
metadata.depth + 1);
encryptedData.decryptionKey = new SubkeyIdentifier(decryptionKeyCandidate.getA(), privateKey.getKeyID());
encryptedData.sessionKey = sessionKey;
IntegrityProtectedInputStream integrityProtected = new IntegrityProtectedInputStream(decrypted, pkesk, options);
nestedInputStream = new OpenPgpMessageInputStream(buffer(integrityProtected), options, encryptedData, policy);
if (decryptPKESKAndStream(decryptionKeyId, decryptorFactory, pkesk)) {
return true;
} catch (PGPException e) {
// hm :/
}
}
}
@ -470,26 +444,12 @@ public class OpenPgpMessageInputStream extends DecryptionStream {
PGPSecretKeyRing decryptionKey = getDecryptionKey(keyId);
SecretKeyRingProtector protector = options.getSecretKeyProtector(decryptionKey);
PGPPrivateKey privateKey = UnlockSecretKey.unlockSecretKey(secretKey, protector.getDecryptor(keyId));
SubkeyIdentifier decryptionKeyId = new SubkeyIdentifier(decryptionKey, keyId);
PublicKeyDataDecryptorFactory decryptorFactory = ImplementationFactory.getInstance()
.getPublicKeyDataDecryptorFactory(privateKey);
try {
InputStream decrypted = pkesk.getDataStream(decryptorFactory);
SessionKey sessionKey = new SessionKey(pkesk.getSessionKey(decryptorFactory));
throwIfUnacceptable(sessionKey.getAlgorithm());
MessageMetadata.EncryptedData encryptedData = new MessageMetadata.EncryptedData(
SymmetricKeyAlgorithm.requireFromId(pkesk.getSymmetricAlgorithm(decryptorFactory)),
metadata.depth + 1);
encryptedData.decryptionKey = new SubkeyIdentifier(decryptionKey, keyId);
encryptedData.sessionKey = sessionKey;
IntegrityProtectedInputStream integrityProtected = new IntegrityProtectedInputStream(decrypted, pkesk, options);
nestedInputStream = new OpenPgpMessageInputStream(buffer(integrityProtected), options, encryptedData, policy);
if (decryptPKESKAndStream(decryptionKeyId, decryptorFactory, pkesk)) {
return true;
} catch (PGPException e) {
// hm :/
}
}
}
@ -501,6 +461,46 @@ public class OpenPgpMessageInputStream extends DecryptionStream {
return false;
}
private boolean decryptSKESKAndStream(PGPPBEEncryptedData skesk, PBEDataDecryptorFactory decryptorFactory) throws IOException, UnacceptableAlgorithmException {
try {
InputStream decrypted = skesk.getDataStream(decryptorFactory);
SessionKey sessionKey = new SessionKey(skesk.getSessionKey(decryptorFactory));
throwIfUnacceptable(sessionKey.getAlgorithm());
MessageMetadata.EncryptedData encryptedData = new MessageMetadata.EncryptedData(
sessionKey.getAlgorithm(), metadata.depth + 1);
encryptedData.sessionKey = sessionKey;
IntegrityProtectedInputStream integrityProtected = new IntegrityProtectedInputStream(decrypted, skesk, options);
nestedInputStream = new OpenPgpMessageInputStream(buffer(integrityProtected), options, encryptedData, policy);
return true;
} catch (UnacceptableAlgorithmException e) {
throw e;
} catch (PGPException e) {
// Password mismatch?
}
return false;
}
private boolean decryptPKESKAndStream(SubkeyIdentifier subkeyIdentifier, PublicKeyDataDecryptorFactory decryptorFactory, PGPPublicKeyEncryptedData pkesk) throws IOException {
try {
InputStream decrypted = pkesk.getDataStream(decryptorFactory);
SessionKey sessionKey = new SessionKey(pkesk.getSessionKey(decryptorFactory));
throwIfUnacceptable(sessionKey.getAlgorithm());
MessageMetadata.EncryptedData encryptedData = new MessageMetadata.EncryptedData(
SymmetricKeyAlgorithm.requireFromId(pkesk.getSymmetricAlgorithm(decryptorFactory)),
metadata.depth + 1);
encryptedData.decryptionKey = subkeyIdentifier;
encryptedData.sessionKey = sessionKey;
IntegrityProtectedInputStream integrityProtected = new IntegrityProtectedInputStream(decrypted, pkesk, options);
nestedInputStream = new OpenPgpMessageInputStream(buffer(integrityProtected), options, encryptedData, policy);
return true;
} catch (PGPException e) {
}
return false;
}
private PGPSecretKey getDecryptionKey(PGPSecretKeyRing decryptionKeys, long keyId) {
KeyRingInfo info = PGPainless.inspectKeyRing(decryptionKeys);
if (info.getEncryptionSubkeys(EncryptionPurpose.ANY).contains(info.getPublicKey(keyId))) {