Question

我在Windows Phone应用程序的C＃中进行加密，我需要使用java解密它。这是我的加密代码

   public static String encrypt(String plaintext, KeyParameter keyParam)
    {
        byte[] ivData = new byte[AES_NIVBITS / 8];
        Random r = new Random();

        r.NextBytes(ivData);


        IBlockCipherPadding padding = new Pkcs7Padding();
         BufferedBlockCipher cipher = new PaddedBufferedBlockCipher(new CbcBlockCipher(new AesEngine()), padding);


        ICipherParameters param = new ParametersWithIV(keyParam, ivData); 
        cipher.Reset();
        cipher.Init(true, param);

        byte[] bytesDec = Encoding.GetEncoding("iso-8859-1").GetBytes(plaintext); 


        byte[] bytesEnc = null;

        int buflen = cipher.GetOutputSize(bytesDec.Length);
        System.Diagnostics.Debug.WriteLine("enc length " + buflen);
        bytesEnc = new byte[buflen];
        int nBytesEnc = cipher.ProcessBytes(bytesDec, 0, bytesDec.Length, bytesEnc, 0);
        nBytesEnc += cipher.DoFinal(bytesEnc, nBytesEnc);

        if (nBytesEnc != bytesEnc.Length)
        {
            throw new Exception("Unexpected behaviour : getOutputSize value incorrect");
        }

        byte[] bytesAll = new byte[ivData.Length + bytesEnc.Length];
        Array.Copy(ivData, 0, bytesAll, 0, ivData.Length);
        Array.Copy(bytesEnc, 0, bytesAll, ivData.Length, bytesEnc.Length);

        byte[] bytesAllb64 = Base64.Encode(bytesAll);
        return Encoding.GetEncoding("iso-8859-1").GetString(bytesAllb64, 0, bytesAllb64.Length);


    }

这是用于解密的java代码

public static String decodeBase64Aes(String encodedciphertext, KeyParameter keyParam) throws Exception 
{
    byte[] bytesEnc = Base64.decode(encodedciphertext.getBytes(ISO8859));

    int nIvBytes = AES_NIVBITS / 8;
    byte[] ivBytes = new byte[nIvBytes];
    System.arraycopy(bytesEnc, 0, ivBytes, 0, nIvBytes);

    CipherParameters params = new ParametersWithIV(keyParam, ivBytes);
    BlockCipherPadding padding = new PKCS7Padding();
    BufferedBlockCipher cipher = new PaddedBufferedBlockCipher(new CBCBlockCipher(new AESEngine()), padding);

    cipher.reset();
    cipher.init(false, params); 

    byte[] bytesDec = null;

    int buflen = cipher.getOutputSize(bytesEnc.length - nIvBytes);
    byte[] workingBuffer = new byte[buflen];
    int len = cipher.processBytes(bytesEnc, nIvBytes, bytesEnc.length - nIvBytes, workingBuffer, 0);
    len += cipher.doFinal(workingBuffer, len);

    bytesDec = new byte[len];
    System.arraycopy(workingBuffer, 0, bytesDec, 0, len);

    return new String(bytesDec, ISO8859);
}

当我加密它时工作正常但是当我使用我得到的密钥测试解密时，它会抛出

Exception in thread "main" org.bouncycastle.crypto.DataLengthException: last block incomplete in decryption

我只能更改c＃部分。任何帮助将受到高度赞赏???

Key  -> 8fe3f8b34e87744c175aae43cc52ee13
'Hello World' -> Nb90n51LqK13LzpalV7qTs7YJqe9m+Ni9uA/U7tU06Y=

异常上线

 len += cipher.doFinal(workingBuffer, len);

当我加密＆＃34; Hello World＆＃34;来自java使用我在我的服务器上加密方法中的相同密钥

uWMz8ZIPh+3jnGtwxpuyK9Qht7BJV4RQ/Iet9JeTrTk=

编辑------

已更新为工作代码。

Answer 1

Base 64与原始版本的长度不同，这就是我为什么会遇到这个错误的原因。我已使用正确的代码更新了代码。

C＃中的加密和Java中的解密

1 个答案: