问题描述

首先，我仅出于学术目的编写以下代码.我之所以这么说是因为我没有把它放在生产环境中，因此我绕过"了一些我需要做的开销，我只需要能够使用加密/解密字符串下面的代码.有几次我能够做到这一点，但由于某种原因，我开始收到CryptographicException Bad Data"并且不确定是什么导致了问题.

First, I have only written the code below for academic purposes. The reason I say this is because I am not putting this in a production environment, and therefor am "bypassing" some of the overhead that I would need to do if I was, I simply need to be able to encrypt/decrypt a string using the code below. I was able to do it a few time, but for some reason, I started receiving "CryptographicException Bad Data" and am not sure what might be causing the problem.

   private string RSAEncrypt(string value)
    {
        byte[] encryptedData = Encoding.Unicode.GetBytes(value);

        CspParameters cspParams = new CspParameters();
        cspParams.KeyContainerName = _rsaContainerName;
        using (RSACryptoServiceProvider RSA = new RSACryptoServiceProvider(2048,cspParams))
        {
            encryptedData = RSA.Encrypt(encryptedData, false);
            return Convert.ToBase64String(encryptedData);

        }

    }



    private string RSADecrypt(string value)
    {

        byte[] encryptedData = Encoding.Unicode.GetBytes(value);

        CspParameters cspParams = new CspParameters();
        cspParams.KeyContainerName = _rsaContainerName;
        using (RSACryptoServiceProvider RSA = new RSACryptoServiceProvider(2048,cspParams))
        { 
            encryptedData = RSA.Decrypt(encryptedData,false);
            return Convert.ToBase64String(encryptedData);

        }
    }

它只是在 RSADecrypt 调用上抛出这个异常.

It is only throwing this exception on the RSADecrypt call.

有什么想法吗?我在某处读到它可能与传递给 RSA.Decrypt 的 encryptedData 的预期大小有关.

Any ideas? I read somewhere it might have to do with the expected size of encryptedData that is passed into RSA.Decrypt.

谢谢}

推荐答案

• 使用字符串编码(即Encoding.Unicode)来回转换明文.

  使用 Base-64 来回转换加密数据(即 Convert.[To/From]Base64String)；

  Convert the encrypted data back and forth using Base-64 (i.e. Convert.[To/From]Base64String);

  像这样:

  private string RSAEncrypt(string value)
  {
      byte[] plaintext = Encoding.Unicode.GetBytes(value);
  
      CspParameters cspParams = new CspParameters();
      cspParams.KeyContainerName = _rsaContainerName;
      using (RSACryptoServiceProvider RSA = new RSACryptoServiceProvider(2048,cspParams))
      {
          byte[] encryptedData = RSA.Encrypt(plaintext, false);
          return Convert.ToBase64String(encryptedData);
      }
  }
  
  private string RSADecrypt(string value)
  {
      byte[] encryptedData = Convert.FromBase64String(value);
  
      CspParameters cspParams = new CspParameters();
      cspParams.KeyContainerName = _rsaContainerName;
      using (RSACryptoServiceProvider RSA = new RSACryptoServiceProvider(2048,cspParams))
      { 
          byte[] decryptedData = RSA.Decrypt(encryptedData,false);
          return Encoding.Unicode.GetString(decryptedData);
      }
  }
  

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