public static EncryptedPrivateKeyInfo createEncryptedPrivateKeyInfo( String algorithm, char[] passPhrase, byte[] salt, int iterationCount, PrivateKeyInfo keyInfo) { if (!PBEUtil.isPBEAlgorithm(algorithm)) { throw new Exception("attempt to use non-PBE algorithm with PBE EncryptedPrivateKeyInfo generation"); } ASN1Encodable parameters = PBEUtil.generateAlgorithmParameters(algorithm, salt, iterationCount); CipherParameters keyParameters = PBEUtil.generateCipherParameters(algorithm, passPhrase, parameters); byte[] encoding = null; Object engine = PBEUtil.createEngine(algorithm); if (engine is BufferedBlockCipher) { BufferedBlockCipher cipher = (BufferedBlockCipher)engine; cipher.init(true, keyParameters); byte[] keyBytes = keyInfo.getEncoded(); int encLen = cipher.getOutputSize(keyBytes.Length); encoding = new byte[encLen]; int off = cipher.processBytes(keyBytes, 0, keyBytes.Length, encoding, 0); cipher.doFinal(encoding, off); } else if (engine is StreamCipher) { StreamCipher cipher = (StreamCipher)engine; cipher.init(true, keyParameters); byte[] keyBytes = keyInfo.getEncoded(); encoding = new byte[keyBytes.Length]; cipher.processBytes(keyBytes, 0, keyBytes.Length, encoding, 0); } return(new EncryptedPrivateKeyInfo(new AlgorithmIdentifier(PBEUtil.getObjectIdentifier(algorithm), parameters), encoding)); }