diff options
Diffstat (limited to 'OpenKeychain/src/main/java/org/spongycastle/openpgp')
2 files changed, 76 insertions, 278 deletions
diff --git a/OpenKeychain/src/main/java/org/spongycastle/openpgp/operator/jcajce/CachingDataDecryptorFactory.java b/OpenKeychain/src/main/java/org/spongycastle/openpgp/operator/jcajce/CachingDataDecryptorFactory.java new file mode 100644 index 000000000..d35f1d751 --- /dev/null +++ b/OpenKeychain/src/main/java/org/spongycastle/openpgp/operator/jcajce/CachingDataDecryptorFactory.java @@ -0,0 +1,76 @@ +/** + * Copyright (c) 2013-2014 Philipp Jakubeit, Signe Rüsch, Dominik Schürmann + * + * Licensed under the Bouncy Castle License (MIT license). See LICENSE file for details. + */ + +package org.spongycastle.openpgp.operator.jcajce; + +import org.spongycastle.jcajce.util.NamedJcaJceHelper; +import org.spongycastle.openpgp.PGPException; +import org.spongycastle.openpgp.PGPPublicKeyEncryptedData; +import org.spongycastle.openpgp.operator.PGPDataDecryptor; +import org.spongycastle.openpgp.operator.PublicKeyDataDecryptorFactory; + +import java.nio.ByteBuffer; +import java.util.Map; + +public class CachingDataDecryptorFactory implements PublicKeyDataDecryptorFactory +{ + private final PublicKeyDataDecryptorFactory mWrappedDecryptor; + private final Map<ByteBuffer, byte[]> mSessionKeyCache; + + private OperatorHelper mOperatorHelper; + + public CachingDataDecryptorFactory(String providerName, + final Map<ByteBuffer,byte[]> sessionKeyCache) + { + mWrappedDecryptor = null; + mSessionKeyCache = sessionKeyCache; + + mOperatorHelper = new OperatorHelper(new NamedJcaJceHelper(providerName)); + } + + public CachingDataDecryptorFactory(PublicKeyDataDecryptorFactory wrapped, + final Map<ByteBuffer,byte[]> sessionKeyCache) + { + mWrappedDecryptor = wrapped; + mSessionKeyCache = sessionKeyCache; + + } + + public boolean hasCachedSessionData(PGPPublicKeyEncryptedData encData) throws PGPException { + ByteBuffer bi = ByteBuffer.wrap(encData.getSessionKey()[0]); + return mSessionKeyCache.containsKey(bi); + } + + public Map<ByteBuffer, byte[]> getCachedSessionKeys() { + return mSessionKeyCache; + } + + public boolean canDecrypt() { + return mWrappedDecryptor != null; + } + + @Override + public byte[] recoverSessionData(int keyAlgorithm, byte[][] secKeyData) throws PGPException { + ByteBuffer bi = ByteBuffer.wrap(secKeyData[0]); // encoded MPI + if (mSessionKeyCache.containsKey(bi)) { + return mSessionKeyCache.get(bi); + } + + byte[] sessionData = mWrappedDecryptor.recoverSessionData(keyAlgorithm, secKeyData); + mSessionKeyCache.put(bi, sessionData); + return sessionData; + } + + @Override + public PGPDataDecryptor createDataDecryptor(boolean withIntegrityPacket, int encAlgorithm, byte[] key) + throws PGPException { + if (mWrappedDecryptor != null) { + return mWrappedDecryptor.createDataDecryptor(withIntegrityPacket, encAlgorithm, key); + } + return mOperatorHelper.createDataDecryptor(withIntegrityPacket, encAlgorithm, key); + } + +} diff --git a/OpenKeychain/src/main/java/org/spongycastle/openpgp/operator/jcajce/NfcSyncPublicKeyDataDecryptorFactoryBuilder.java b/OpenKeychain/src/main/java/org/spongycastle/openpgp/operator/jcajce/NfcSyncPublicKeyDataDecryptorFactoryBuilder.java deleted file mode 100644 index 067bb3e19..000000000 --- a/OpenKeychain/src/main/java/org/spongycastle/openpgp/operator/jcajce/NfcSyncPublicKeyDataDecryptorFactoryBuilder.java +++ /dev/null @@ -1,278 +0,0 @@ -/** - * Copyright (c) 2013-2014 Philipp Jakubeit, Signe Rüsch, Dominik Schürmann - * - * Licensed under the Bouncy Castle License (MIT license). See LICENSE file for details. - */ - -package org.spongycastle.openpgp.operator.jcajce; - -import org.spongycastle.bcpg.PublicKeyAlgorithmTags; -import org.spongycastle.jcajce.util.DefaultJcaJceHelper; -import org.spongycastle.jcajce.util.NamedJcaJceHelper; -import org.spongycastle.jcajce.util.ProviderJcaJceHelper; -import org.spongycastle.openpgp.PGPException; -import org.spongycastle.openpgp.PGPPublicKey; -import org.spongycastle.openpgp.operator.PGPDataDecryptor; -import org.spongycastle.openpgp.operator.PublicKeyDataDecryptorFactory; - -import java.nio.ByteBuffer; -import java.security.Provider; -import java.util.Map; - - -/** - * This class is based on JcePublicKeyDataDecryptorFactoryBuilder - * - */ -public class NfcSyncPublicKeyDataDecryptorFactoryBuilder -{ - private OperatorHelper helper = new OperatorHelper(new DefaultJcaJceHelper()); - private OperatorHelper contentHelper = new OperatorHelper(new DefaultJcaJceHelper()); - private JcaPGPKeyConverter keyConverter = new JcaPGPKeyConverter(); -// private JcaPGPDigestCalculatorProviderBuilder digestCalculatorProviderBuilder = new JcaPGPDigestCalculatorProviderBuilder(); -// private JcaKeyFingerprintCalculator fingerprintCalculator = new JcaKeyFingerprintCalculator(); - - public static class NfcInteractionNeeded extends RuntimeException - { - public byte[] encryptedSessionKey; - - public NfcInteractionNeeded(byte[] encryptedSessionKey) - { - super("NFC interaction required!"); - this.encryptedSessionKey = encryptedSessionKey; - } - } - - public NfcSyncPublicKeyDataDecryptorFactoryBuilder() - { - } - - /** - * Set the provider object to use for creating cryptographic primitives in the resulting factory the builder produces. - * - * @param provider provider object for cryptographic primitives. - * @return the current builder. - */ - public NfcSyncPublicKeyDataDecryptorFactoryBuilder setProvider(Provider provider) - { - this.helper = new OperatorHelper(new ProviderJcaJceHelper(provider)); - keyConverter.setProvider(provider); - this.contentHelper = helper; - - return this; - } - - /** - * Set the provider name to use for creating cryptographic primitives in the resulting factory the builder produces. - * - * @param providerName the name of the provider to reference for cryptographic primitives. - * @return the current builder. - */ - public NfcSyncPublicKeyDataDecryptorFactoryBuilder setProvider(String providerName) - { - this.helper = new OperatorHelper(new NamedJcaJceHelper(providerName)); - keyConverter.setProvider(providerName); - this.contentHelper = helper; - - return this; - } - - public NfcSyncPublicKeyDataDecryptorFactoryBuilder setContentProvider(Provider provider) - { - this.contentHelper = new OperatorHelper(new ProviderJcaJceHelper(provider)); - - return this; - } - - public NfcSyncPublicKeyDataDecryptorFactoryBuilder setContentProvider(String providerName) - { - this.contentHelper = new OperatorHelper(new NamedJcaJceHelper(providerName)); - - return this; - } - - public PublicKeyDataDecryptorFactory build(final Map<ByteBuffer,byte[]> nfcDecryptedMap) { - return new PublicKeyDataDecryptorFactory() - { - public byte[] recoverSessionData(int keyAlgorithm, byte[][] secKeyData) - throws PGPException - { - if (keyAlgorithm == PublicKeyAlgorithmTags.ECDH) - { - throw new PGPException("ECDH not supported!"); - } - - return decryptSessionData(keyAlgorithm, secKeyData, nfcDecryptedMap); - } - - public PGPDataDecryptor createDataDecryptor(boolean withIntegrityPacket, int encAlgorithm, byte[] key) - throws PGPException - { - return contentHelper.createDataDecryptor(withIntegrityPacket, encAlgorithm, key); - } - }; - } - -// public PublicKeyDataDecryptorFactory build(final PrivateKey privKey) -// { -// return new PublicKeyDataDecryptorFactory() -// { -// public byte[] recoverSessionData(int keyAlgorithm, byte[][] secKeyData) -// throws PGPException -// { -// if (keyAlgorithm == PublicKeyAlgorithmTags.ECDH) -// { -// throw new PGPException("ECDH requires use of PGPPrivateKey for decryption"); -// } -// return decryptSessionData(keyAlgorithm, privKey, secKeyData); -// } -// -// public PGPDataDecryptor createDataDecryptor(boolean withIntegrityPacket, int encAlgorithm, byte[] key) -// throws PGPException -// { -// return contentHelper.createDataDecryptor(withIntegrityPacket, encAlgorithm, key); -// } -// }; -// } - -// public PublicKeyDataDecryptorFactory build(final PGPPrivateKey privKey, final byte[] nfcDecrypted) -// { -// return new PublicKeyDataDecryptorFactory() -// { -// public byte[] recoverSessionData(int keyAlgorithm, byte[][] secKeyData) -// throws PGPException -// { -// if (keyAlgorithm == PublicKeyAlgorithmTags.ECDH) -// { -// return decryptSessionData(privKey.getPrivateKeyDataPacket(), privKey.getPublicKeyPacket(), secKeyData); -// } -// -// return decryptSessionData(keyAlgorithm, keyConverter.getPrivateKey(privKey), secKeyData, nfcDecrypted); -// } -// -// public PGPDataDecryptor createDataDecryptor(boolean withIntegrityPacket, int encAlgorithm, byte[] key) -// throws PGPException -// { -// return contentHelper.createDataDecryptor(withIntegrityPacket, encAlgorithm, key); -// } -// }; -// } - -// private byte[] decryptSessionData(BCPGKey privateKeyPacket, PublicKeyPacket pubKeyData, byte[][] secKeyData) -// throws PGPException -// { -// ECDHPublicBCPGKey ecKey = (ECDHPublicBCPGKey)pubKeyData.getKey(); -// X9ECParameters x9Params = NISTNamedCurves.getByOID(ecKey.getCurveOID()); -// -// byte[] enc = secKeyData[0]; -// -// int pLen = ((((enc[0] & 0xff) << 8) + (enc[1] & 0xff)) + 7) / 8; -// byte[] pEnc = new byte[pLen]; -// -// System.arraycopy(enc, 2, pEnc, 0, pLen); -// -// byte[] keyEnc = new byte[enc[pLen + 2]]; -// -// System.arraycopy(enc, 2 + pLen + 1, keyEnc, 0, keyEnc.length); -// -// Cipher c = helper.createKeyWrapper(ecKey.getSymmetricKeyAlgorithm()); -// -// ECPoint S = x9Params.getCurve().decodePoint(pEnc).multiply(((ECSecretBCPGKey)privateKeyPacket).getX()).normalize(); -// -// RFC6637KDFCalculator rfc6637KDFCalculator = new RFC6637KDFCalculator(digestCalculatorProviderBuilder.build().get(ecKey.getHashAlgorithm()), ecKey.getSymmetricKeyAlgorithm()); -// Key key = new SecretKeySpec(rfc6637KDFCalculator.createKey(ecKey.getCurveOID(), S, fingerprintCalculator.calculateFingerprint(pubKeyData)), "AESWrap"); -// -// try -// { -// c.init(Cipher.UNWRAP_MODE, key); -// -// Key paddedSessionKey = c.unwrap(keyEnc, "Session", Cipher.SECRET_KEY); -// -// return PGPPad.unpadSessionData(paddedSessionKey.getEncoded()); -// } -// catch (InvalidKeyException e) -// { -// throw new PGPException("error setting asymmetric cipher", e); -// } -// catch (NoSuchAlgorithmException e) -// { -// throw new PGPException("error setting asymmetric cipher", e); -// } -// } - - private byte[] decryptSessionData(int keyAlgorithm, byte[][] secKeyData, - Map<ByteBuffer,byte[]> nfcDecryptedMap) - throws PGPException - { -// Cipher c1 = helper.createPublicKeyCipher(keyAlgorithm); -// -// try -// { -// c1.init(Cipher.DECRYPT_MODE, privKey); -// } -// catch (InvalidKeyException e) -// { -// throw new PGPException("error setting asymmetric cipher", e); -// } - - if (keyAlgorithm == PGPPublicKey.RSA_ENCRYPT - || keyAlgorithm == PGPPublicKey.RSA_GENERAL) - { - ByteBuffer bi = ByteBuffer.wrap(secKeyData[0]); // encoded MPI - - if (nfcDecryptedMap.containsKey(bi)) { - return nfcDecryptedMap.get(bi); - } else { - // catch this when decryptSessionData() is executed and divert digest to card, - // when doing the operation again reuse nfcDecrypted - throw new NfcInteractionNeeded(bi.array()); - } - -// c1.update(bi, 2, bi.length - 2); - } - else - { - throw new PGPException("ElGamal not supported!"); - -// ElGamalKey k = (ElGamalKey)privKey; -// int size = (k.getParameters().getP().bitLength() + 7) / 8; -// byte[] tmp = new byte[size]; -// -// byte[] bi = secKeyData[0]; // encoded MPI -// if (bi.length - 2 > size) // leading Zero? Shouldn't happen but... -// { -// c1.update(bi, 3, bi.length - 3); -// } -// else -// { -// System.arraycopy(bi, 2, tmp, tmp.length - (bi.length - 2), bi.length - 2); -// c1.update(tmp); -// } -// -// bi = secKeyData[1]; // encoded MPI -// for (int i = 0; i != tmp.length; i++) -// { -// tmp[i] = 0; -// } -// -// if (bi.length - 2 > size) // leading Zero? Shouldn't happen but... -// { -// c1.update(bi, 3, bi.length - 3); -// } -// else -// { -// System.arraycopy(bi, 2, tmp, tmp.length - (bi.length - 2), bi.length - 2); -// c1.update(tmp); -// } - } - -// try -// { -// return c1.doFinal(); -// } -// catch (Exception e) -// { -// throw new PGPException("exception decrypting session data", e); -// } - } -} |