Question

当我尝试解密我的加密密钥时，我收到一条错误消息，说明它的数据/数据不正确。试图搜索一会儿没有任何结果。这是加密代码和解密代码。 indata是用于加密的MAC地址，用于解密的indata是从文本文件中读取的。

public string encryptMAC(string indata)
    {
        byte[] resultCrypt;
        UTF8Encoding utf8 = new UTF8Encoding();

        TripleDESCryptoServiceProvider tdes = new TripleDESCryptoServiceProvider();
        tdes.Mode = CipherMode.ECB;
        tdes.Padding = PaddingMode.PKCS7;

        byte[] encrypt = utf8.GetBytes(indata);

        try
        {
            ICryptoTransform encryptor = tdes.CreateEncryptor();
            resultCrypt = encryptor.TransformFinalBlock(encrypt, 0, encrypt.Length);
        }
        finally
        {
            tdes.Clear();
        }

        return Convert.ToBase64String(resultCrypt);
    }

        public string decryptMAC(string indata)
    {
        byte[] resultDecrypt;
        UTF8Encoding utf8 = new UTF8Encoding();

        TripleDESCryptoServiceProvider tdes = new TripleDESCryptoServiceProvider();
        tdes.Mode = CipherMode.ECB;
        tdes.Padding = PaddingMode.PKCS7;

        byte[] decrypt = Convert.FromBase64String(indata);

        try
        {
            ICryptoTransform decryptor = tdes.CreateDecryptor();
            resultDecrypt = decryptor.TransformFinalBlock(decrypt, 0, decrypt.Length);
        }
        catch (CryptographicException ex)
        {
            Console.WriteLine(ex);
        }
        finally
        {
            tdes.Clear();
        }

        return utf8.GetString(decrypt);
    }

Answer 1

TripleDESCryptoServiceProvider会为您生成一个密钥。如果您没有自己设置或在加密期间检索它，那么您将不能够解密密文。

我建议您为方法添加一个密钥，并使用相同的密钥进行加密和解密：

public string encryptMAC(string indata, byte[] key)
{
    byte[] resultCrypt;
    UTF8Encoding utf8 = new UTF8Encoding();

    TripleDESCryptoServiceProvider tdes = new TripleDESCryptoServiceProvider();
    tdes.Mode = CipherMode.ECB;
    tdes.Padding = PaddingMode.PKCS7;
    tdes.Key = key;

    byte[] encrypt = utf8.GetBytes(indata);

    try
    {
        ICryptoTransform encryptor = tdes.CreateEncryptor();
        resultCrypt = encryptor.TransformFinalBlock(encrypt, 0, encrypt.Length);
    }
    finally
    {
        tdes.Clear();
    }

    return Convert.ToBase64String(resultCrypt);
}

public string decryptMAC(string indata, byte[] key)
{
    byte[] resultDecrypt = new byte[0];
    UTF8Encoding utf8 = new UTF8Encoding();

    TripleDESCryptoServiceProvider tdes = new TripleDESCryptoServiceProvider();
    tdes.Mode = CipherMode.ECB;
    tdes.Padding = PaddingMode.PKCS7;
    tdes.Key = key;

    byte[] decrypt = Convert.FromBase64String(indata);

    try
    {
        ICryptoTransform decryptor = tdes.CreateDecryptor();
        resultDecrypt = decryptor.TransformFinalBlock(decrypt, 0, decrypt.Length);
    }
    catch (CryptographicException ex)
    {
        Console.WriteLine(ex);
    }
    finally
    {
        tdes.Clear();
    }

    return utf8.GetString(resultDecrypt);
}

请记住，DES有一小组弱键，因此您应该使用TripleDESCryptoServiceProvider为您生成一个键，用于过滤掉这些弱键。您可以(new TripleDESCryptoServiceProvider()).Key生成有效密钥。

TripleDESCryptoService - ＆＃34;错误的数据＆＃34;

1 个答案: