private Cipher getCipher(SecretKey key) { EncryptionHeader em = getEncryptionInfo().getHeader(); ChainingMode cm = em.getChainingMode(); assert(cm == ChainingMode.ecb); return CryptoFunctions.getCipher(key, em.getCipherAlgorithm(), cm, null, Cipher.DECRYPT_MODE); }
protected static Cipher initCipherForBlock(Cipher existing, int block, boolean lastChunk, EncryptionInfo encryptionInfo, SecretKey skey, int encryptionMode) throws GeneralSecurityException { EncryptionHeader header = encryptionInfo.getHeader(); String padding = (lastChunk ? "PKCS5Padding" : "NoPadding"); if (existing == null || !existing.getAlgorithm().endsWith(padding)) { existing = getCipher(skey, header.getCipherAlgorithm(), header.getChainingMode(), header.getKeySalt(), encryptionMode, padding); } byte[] blockKey = new byte[4]; LittleEndian.putInt(blockKey, 0, block); byte[] iv = generateIv(header.getHashAlgorithm(), header.getKeySalt(), blockKey, header.getBlockSize()); AlgorithmParameterSpec aps; if (header.getCipherAlgorithm() == CipherAlgorithm.rc2) { aps = new RC2ParameterSpec(skey.getEncoded().length*8, iv); } else { aps = new IvParameterSpec(iv); } existing.init(encryptionMode, skey, aps); return existing; }
private Cipher getCipher(SecretKey key) { EncryptionHeader em = getEncryptionInfo().getHeader(); ChainingMode cm = em.getChainingMode(); assert(cm == ChainingMode.ecb); return CryptoFunctions.getCipher(key, em.getCipherAlgorithm(), cm, null, Cipher.DECRYPT_MODE); }
protected static Cipher initCipherForBlock(Cipher existing, int block, boolean lastChunk, EncryptionInfo encryptionInfo, SecretKey skey, int encryptionMode) throws GeneralSecurityException { EncryptionHeader header = encryptionInfo.getHeader(); String padding = (lastChunk ? "PKCS5Padding" : "NoPadding"); if (existing == null || !existing.getAlgorithm().endsWith(padding)) { existing = getCipher(skey, header.getCipherAlgorithm(), header.getChainingMode(), header.getKeySalt(), encryptionMode, padding); } byte[] blockKey = new byte[4]; LittleEndian.putInt(blockKey, 0, block); byte[] iv = generateIv(header.getHashAlgorithm(), header.getKeySalt(), blockKey, header.getBlockSize()); AlgorithmParameterSpec aps; if (header.getCipherAlgorithm() == CipherAlgorithm.rc2) { aps = new RC2ParameterSpec(skey.getEncoded().length*8, iv); } else { aps = new IvParameterSpec(iv); } existing.init(encryptionMode, skey, aps); return existing; }
this.cm = d.getEncryptionInfo().getHeader().getChainingMode(); try { if (!d.verifyPassword(this.hocr.getPassword())) {