加密和解密错误 [英] Error in Encryption and Decryption

问题描述

我使用代码解密一些细节并再次对其进行加密以查看原始内容，但有些细节有双重加密，我无法解密细节。请帮忙。



使用的代码是

 public static string EncryptData （字符串消息）
 {
 byte []结果; 
 System.Text.UTF8Encoding UTF8 = new System.Text.UTF8Encoding（）; 
 MD5CryptoServiceProvider HashProvider = new MD5CryptoServiceProvider（）; 
 byte [] TDESKey = HashProvider.ComputeHash（UTF8.GetBytes（passphrase））; 
 TripleDESCryptoServiceProvider TDESAlgorithm = new TripleDESCryptoServiceProvider（）; 
 TDESAlgorithm.Key = TDESKey; 
 TDESAlgorithm.Mode = CipherMode.ECB; 
 TDESAlgorithm.Padding = PaddingMode.PKCS7; 
 byte [] DataToEncrypt = UTF8.GetBytes（Message）; 
 try 
 {
 ICryptoTransform Encryptor = TDESAlgorithm.CreateEncryptor（）; 
结果= Encryptor.TransformFinalBlock（DataToEncrypt，0，DataToEncrypt.Length）; 
} 
最后
 {
 TDESAlgorithm.Clear（）; 
 HashProvider.Clear（）; 
} 
返回Convert.ToBase64String（Results）; 
} 
 
 
公共静态字符串DecryptString（字符串消息）
 {
 byte []结果; 
 System.Text.UTF8Encoding UTF8 = new System.Text.UTF8Encoding（）; 
 MD5CryptoServiceProvider HashProvider = new MD5CryptoServiceProvider（）; 
 byte [] TDESKey = HashProvider.ComputeHash（UTF8.GetBytes（passphrase））; 
 TripleDESCryptoServiceProvider TDESAlgorithm = new TripleDESCryptoServiceProvider（）; 
 TDESAlgorithm.Key = TDESKey; 
 TDESAlgorithm.Mode = CipherMode.ECB; 
 TDESAlgorithm.Padding = PaddingMode.PKCS7; 
 byte [] DataToDecrypt = Convert.FromBase64String（Message）; 
 try 
 {
 ICryptoTransform Decryptor = TDESAlgorithm.CreateDecryptor（）; 
结果= Decryptor.TransformFinalBlock（DataToDecrypt，0，DataToDecrypt.Length）; 
} 
最后
 {
 TDESAlgorithm.Clear（）; 
 HashProvider.Clear（）; 
} 
返回UTF8.GetString（结果）; 
} 

我发现以下错误



Base-64字符数组的长度无效。

解决方案

我认为您在解密时忘记将字符串从base64转换为普通字符串



使用此

 Convert.FromBase64String（
  p> 
方法
 
 
 
谢谢
 
 --RA 

这是一种方法..试试..

  private   static   string 加密（ string  plainStr， string  completeEncodedKey， int  keySize）
 {
 RijndaelManaged aesEncryption =  new  RijndaelManaged（）; 
 aesEncryption.KeySize = keySize; 
 aesEncryption.BlockSize =  128 ; 
 aesEncryption.Mode = CipherMode.CBC; 
 aesEncryption.Padding = PaddingMode.PKCS7; 
 aesEncryption.IV = Convert.FromBase64String（Encoding.UTF8.GetString（Convert.FromBase64String（completeEncodedKey））。Split（' ，'）[ 0 ]）; 
 aesEncryption.Key = Convert.FromBase64String（Encoding.UTF8.GetString（Convert.FromBase64String（completeEncodedKey））。Split（' ，'）[ 1 ]）; 
  byte  [] plainText = Encoding.UTF8.GetBytes（plainStr）; 
 ICryptoTransform crypto = aesEncryption.CreateEncryptor（）; 
  //  加密和解密的结果 
  byte  [] cipherText = crypto.TransformFinalBlock（plainText， 0 ，plainText.Length）; 
  return  Convert.ToBase64String（cipherText）; 
} 
 
 
 
 
 私人  static   string 解密（字符串 encryptedText， string  completeEncodedKey， int  keySize）
 {
 RijndaelManaged aesEncryption =  new  RijndaelManaged的（）; 
 aesEncryption.KeySize = keySize; 
 aesEncryption.BlockSize =  128 ; 
 aesEncryption.Mode = CipherMode.CBC; 
 aesEncryption.Padding = PaddingMode.PKCS7; 
 aesEncryption.IV = Convert.FromBase64String（Encoding.UTF8.GetString（Convert.FromBase64String（completeEncodedKey））。Split（' ，'）[ 0 ]）; 
 aesEncryption.Key = Convert.FromBase64String（Encoding.UTF8.GetString（Convert.FromBase64String（completeEncodedKey））。Split（' ，'）[ 1 ]）; 
 ICryptoTransform decrypto = aesEncryption.CreateDecryptor（）; 
  byte  [] encryptedBytes = Convert.FromBase64CharArray（encryptedText.ToCharArray（）， 0 ，encryptedText 。长度）; 
  return  Encoding.UTF8.GetString（decrypto.TransformFinalBlock（encryptedBytes， 0 ，encryptedBytes.Length ））; 
} 
 

Hi,


I m using the code to decrypt some details and again encrypt it to view the original, but some details are got double encrypted and I am not able to decrypt the details. Please help.

The code i m using is

public static string EncryptData(string Message)
    {
        byte[] Results;
        System.Text.UTF8Encoding UTF8 = new System.Text.UTF8Encoding();
        MD5CryptoServiceProvider HashProvider = new MD5CryptoServiceProvider();
        byte[] TDESKey = HashProvider.ComputeHash(UTF8.GetBytes(passphrase));
        TripleDESCryptoServiceProvider TDESAlgorithm = new TripleDESCryptoServiceProvider();
        TDESAlgorithm.Key = TDESKey;
        TDESAlgorithm.Mode = CipherMode.ECB;
        TDESAlgorithm.Padding = PaddingMode.PKCS7;
        byte[] DataToEncrypt = UTF8.GetBytes(Message);
        try
        {
            ICryptoTransform Encryptor = TDESAlgorithm.CreateEncryptor();
            Results = Encryptor.TransformFinalBlock(DataToEncrypt, 0, DataToEncrypt.Length);
        }
        finally
        {
            TDESAlgorithm.Clear();
            HashProvider.Clear();
        }
        return Convert.ToBase64String(Results);
    }


public static string DecryptString(string Message)
    {
        byte[] Results;
        System.Text.UTF8Encoding UTF8 = new System.Text.UTF8Encoding();
        MD5CryptoServiceProvider HashProvider = new MD5CryptoServiceProvider();
        byte[] TDESKey = HashProvider.ComputeHash(UTF8.GetBytes(passphrase));
        TripleDESCryptoServiceProvider TDESAlgorithm = new TripleDESCryptoServiceProvider();
        TDESAlgorithm.Key = TDESKey;
        TDESAlgorithm.Mode = CipherMode.ECB;
        TDESAlgorithm.Padding = PaddingMode.PKCS7;
        byte[] DataToDecrypt = Convert.FromBase64String(Message);
        try
        {
            ICryptoTransform Decryptor = TDESAlgorithm.CreateDecryptor();
            Results = Decryptor.TransformFinalBlock(DataToDecrypt, 0, DataToDecrypt.Length);
        }
        finally
        {
            TDESAlgorithm.Clear();
            HashProvider.Clear();
        }
        return UTF8.GetString(Results);
    }

I m geting the below error

Invalid length for a Base-64 char array.

解决方案

I think you forget to convert the string from base64 to normal string while decrypting

use this

Convert.FromBase64String(

in

DecryptString(

method

Thanks
--RA

Here is one method..just try..

private static string Encrypt(string plainStr, string completeEncodedKey, int keySize)
    {
        RijndaelManaged aesEncryption = new RijndaelManaged();
        aesEncryption.KeySize = keySize;
        aesEncryption.BlockSize = 128;
        aesEncryption.Mode = CipherMode.CBC;
        aesEncryption.Padding = PaddingMode.PKCS7;
        aesEncryption.IV = Convert.FromBase64String(Encoding.UTF8.GetString(Convert.FromBase64String(completeEncodedKey)).Split(',')[0]);
        aesEncryption.Key = Convert.FromBase64String(Encoding.UTF8.GetString(Convert.FromBase64String(completeEncodedKey)).Split(',')[1]);
        byte[] plainText = Encoding.UTF8.GetBytes(plainStr);
        ICryptoTransform crypto = aesEncryption.CreateEncryptor();
        // The result of the encryption and decryption
        byte[] cipherText = crypto.TransformFinalBlock(plainText, 0, plainText.Length);
        return Convert.ToBase64String(cipherText);
    }




    private static string Decrypt(string encryptedText, string completeEncodedKey, int keySize)
    {
        RijndaelManaged aesEncryption = new RijndaelManaged();
        aesEncryption.KeySize = keySize;
        aesEncryption.BlockSize = 128;
        aesEncryption.Mode = CipherMode.CBC;
        aesEncryption.Padding = PaddingMode.PKCS7;
        aesEncryption.IV = Convert.FromBase64String(Encoding.UTF8.GetString(Convert.FromBase64String(completeEncodedKey)).Split(',')[0]);
        aesEncryption.Key = Convert.FromBase64String(Encoding.UTF8.GetString(Convert.FromBase64String(completeEncodedKey)).Split(',')[1]);
        ICryptoTransform decrypto = aesEncryption.CreateDecryptor();
        byte[] encryptedBytes = Convert.FromBase64CharArray(encryptedText.ToCharArray(), 0, encryptedText.Length);
        return Encoding.UTF8.GetString(decrypto.TransformFinalBlock(encryptedBytes, 0, encryptedBytes.Length));
    }

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