Question

我已经用php加密了字符串。已成功从php和node.js解密。另外，它必须由java解密。

帮我一个从Java解密的例子吗？

PHP加密代码

/* encrypt */
$encryption_method = 'aes-256-cbc';
$secretHash = "d95acd54c6a821ff32c52825b931c194";
$iv_size = openssl_cipher_iv_length($encryption_method);
$iv = openssl_random_pseudo_bytes($iv_size);

//encrypt
$encryptedMessage = openssl_encrypt($new_token, $encryption_method, $secretHash, 0, $iv);

//Concatenate iv with data
$ciphertext = bin2hex($iv).$encryptedMessage;

/* decrypt the cipher */
$iv_size = openssl_cipher_iv_length($encryptionMethod);
$iv = hex2bin(substr($encryptedMessageWithIv, 0, $iv_size * 2));

$decryptedMessage = openssl_decrypt(substr($encryptedMessageWithIv, $iv_size * 2), $encryptionMethod, $secretHash, 0, $iv);

Answer 1

下面是使用AES算法对字符串进行加密和解密的过程。

 private static final String key = "aesEncryptionKey";
    private static final String initVector = "encryptionIntVec";

    public static String encrypt(String value) {
        try {
            IvParameterSpec iv = new IvParameterSpec(initVector.getBytes("UTF-8"));
            SecretKeySpec skeySpec = new SecretKeySpec(key.getBytes("UTF-8"), "AES");

            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING");
            cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv);

            byte[] encrypted = cipher.doFinal(value.getBytes());
            return Base64.encodeBase64String(encrypted);
        } catch (Exception ex) {
            ex.printStackTrace();
        }
        return null;
    }

public static String decrypt(String encrypted) {
    try {
        IvParameterSpec iv = new IvParameterSpec(initVector.getBytes("UTF-8"));
        SecretKeySpec skeySpec = new SecretKeySpec(key.getBytes("UTF-8"), "AES");

        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING");
        cipher.init(Cipher.DECRYPT_MODE, skeySpec, iv);
        byte[] original = cipher.doFinal(Base64.decodeBase64(encrypted));

        return new String(original);
    } catch (Exception ex) {
        ex.printStackTrace();
    }

    return null;
}

如果不知道初始化向量，请尝试使用下面的代码段。

public byte[] decrypt(String encryptedString) throws DataLengthException, InvalidCipherTextException {

        byte[] input = encryptedString.getBytes("UTF-8");
        CBCBlockCipher cbcBlockCipher = new CBCBlockCipher(new AESEngine());
        SecureRandom random = new SecureRandom();;
        KeyParameter key = new KeyParameter("$secretHash".getBytes());// your key string
        BlockCipherPadding blockCipherPadding = new PKCS7Padding();;
        PaddedBufferedBlockCipher pbbc = new PaddedBufferedBlockCipher(cbcBlockCipher, blockCipherPadding);

        int blockSize = cbcBlockCipher.getBlockSize(); // Make sure this block size is same as that used while encrypting the string.
        int inputOffset = 0;
        int inputLength = input.length;
        int outputOffset = 0;

        byte[] initializationVector = new byte[blockSize];

        System.arraycopy(input, 0, initializationVector, 0, blockSize);
        inputOffset += blockSize;
        inputLength -= blockSize;

        pbbc.init(encrypt, new ParametersWithIV(key, initializationVector));
        byte[] output = new byte[pbbc.getOutputSize(inputLength) + outputOffset];

        int outputLength = outputOffset + pbbc.processBytes(input, inputOffset, inputLength, output, outputOffset);

        outputLength += pbbc.doFinal(output, outputLength);

        return Arrays.copyOf(output, outputLength);
    }

如何在Java中解密Aes-256-cbc

1 个答案: