AES256加密方案

/**
     * 这里最好使用加密后的字符串
     */
    private static char[] password = "0123456789abcdef0123456789abcdef".toCharArray();
    
    /**
     *  这里最好使用加密后的字符串
     */
    private static byte[] salt = "0123456789".getBytes();
    
    private static int iterationCount = 5;


    /**
     * 加密算法
     * @param passwordText
     * @return
     * @throws DataLengthException
     * @throws IllegalStateException
     * @throws InvalidCipherTextException
     */
    public static String encryptRijndael(String passwordText) throws DataLengthException, IllegalStateException, InvalidCipherTextException {

        PKCS12ParametersGenerator pGen = new PKCS12ParametersGenerator(new SHA256Digest());
        char[] passwordChars = password;

        final byte[] pkcs12PasswordBytes = PBEParametersGenerator.PKCS12PasswordToBytes(passwordChars);
        pGen.init(pkcs12PasswordBytes, salt , iterationCount );     

        BlockCipher engine = new RijndaelEngine(256);
        CBCBlockCipher cbc = new CBCBlockCipher(engine);
        BufferedBlockCipher cipher = new PaddedBufferedBlockCipher(cbc, new PKCS7Padding());

        ParametersWithIV aesCBCParams = (ParametersWithIV) pGen.generateDerivedParameters(256, 256);
        cipher.init(true, aesCBCParams);

        byte[] input = passwordText.getBytes();
        byte[] cipherText = new byte[cipher.getOutputSize(input.length)];

        int cipherLength = cipher.processBytes(input, 0, input.length, cipherText, 0);
        cipher.doFinal(cipherText, cipherLength);

//        String result = new String(Base64.encode(cipherText));
//        System.out.println("testEncryptRijndael result : " + result);
//        assertEquals("cMoMSNMNsikAkLjaheE6iD48Xkfvo7Y6gS8/zroGfHc=",result);
        return  new String(Base64.encode(cipherText));
    }

    /**
     * 解密算法
     * @param passwordText
     * @return
     * @throws DataLengthException
     * @throws IllegalStateException
     * @throws InvalidCipherTextException
     */

    public static String decryptRijndael(String passwordText) throws DataLengthException, IllegalStateException, InvalidCipherTextException {
        PKCS12ParametersGenerator pGen = new PKCS12ParametersGenerator(new SHA256Digest());
        char[] passwordChars = password;

        final byte[] pkcs12PasswordBytes = PBEParametersGenerator.PKCS12PasswordToBytes(passwordChars);
        pGen.init(pkcs12PasswordBytes, salt , iterationCount );     

        BlockCipher engine = new RijndaelEngine(256);
        CBCBlockCipher cbc = new CBCBlockCipher(engine);
        BufferedBlockCipher cipher = new PaddedBufferedBlockCipher(cbc, new PKCS7Padding());

        ParametersWithIV aesCBCParams = (ParametersWithIV) pGen.generateDerivedParameters(256, 256);
        cipher.init(false, aesCBCParams);

        byte[] output = Base64.decode(passwordText.getBytes());
        byte[] cipherText = new byte[cipher.getOutputSize(output.length)];

        int cipherLength = cipher.processBytes(output, 0, output.length, cipherText, 0);
        int outputLength = cipher.doFinal(cipherText, cipherLength);
        outputLength += cipherLength;

        byte[] resultBytes = cipherText;
        if (outputLength != output.length) {
            resultBytes = new byte[outputLength];
            System.arraycopy(
                    cipherText, 0,
                    resultBytes, 0,
                    outputLength
                    );
        }

//        String result = new String(resultBytes);
//        System.out.println("testDecryptRijndael result : " + result);
//        assertEquals("Hallo ich bin ein Test", result);
        return  new String(resultBytes);
    }

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