Question

我试图用C＃中的Bouncycastle解密一条河豚加密字符串。

我能够轻松地加密和解密我自己的字符串，但不幸的是，我必须解密由另一个系统生成的字符串。

我可以使用以下内容使用C＃/ Bouncycastle重新创建相同的字符串，但我还没有成功解密。

    using Org.BouncyCastle.Crypto.Engines;
    using Org.BouncyCastle.Crypto.Paddings;
    using Org.BouncyCastle.Crypto.Parameters;

...

    static readonly Encoding Encoding = Encoding.UTF8;

    public string BlowfishEncrypt(string strValue, string key)
    {
        try
        {
            BlowfishEngine engine = new BlowfishEngine();

            PaddedBufferedBlockCipher cipher = new PaddedBufferedBlockCipher(engine);

            KeyParameter keyBytes = new KeyParameter(Encoding.GetBytes(key));

            cipher.Init(true, keyBytes);

            byte[] inB = Encoding.GetBytes(strValue);

            byte[] outB = new byte[cipher.GetOutputSize(inB.Length)];

            int len1 = cipher.ProcessBytes(inB, 0, inB.Length, outB, 0);

            cipher.DoFinal(outB, len1);

            return BitConverter.ToString(outB).Replace("-", "");
        }
        catch (Exception)
        {
            return "";
        }
    }

以下是我目前解密的内容。因错误而失败的行＆＃34; pad块损坏＆＃34;是cipher.DoFinal(out2, len2);

    public string BlowfishDecrypt(string name, string keyString)
    {


        BlowfishEngine engine = new BlowfishEngine();
        PaddedBufferedBlockCipher cipher = new PaddedBufferedBlockCipher(engine);

        StringBuilder result = new StringBuilder();

        cipher.Init(false, new KeyParameter(Encoding.GetBytes(keyString)));

        byte[] out1 = Convert.FromBase64String(name);
        byte[] out2 = new byte[cipher.GetOutputSize(out1.Length)];

        int len2 = cipher.ProcessBytes(out1, 0, out1.Length, out2, 0);

        cipher.DoFinal(out2, len2); //Pad block corrupted error happens here

        String s2 = BitConverter.ToString(out2);

        for (int i = 0; i < s2.Length; i++) {
            char c = s2[i];
            if (c != 0) {
                result.Append(c.ToString());
            }
        }

        return result.ToString();

    }

知道我在BlowfishDecrypt（）中做错了什么吗？

注意：我从一个我在某处找到的bouncycastle Java示例转换了上面的内容（加密和解密）;加密工作。我能看到的唯一区别是Java示例使用StringBuffer，我使用StringBuilder。

Answer 1

谢谢你，Artjom B！

byte[] out1 = Convert.FromBase64String(name);

应该是

byte[] out1 = Hex.Decode(name);

从那里，我所要做的就是将Hex转换为字符串。

c＃Bouncy Castle Blowfish Decryption - Pad block corrupted

1 个答案: