错误：“Base-64 char数组的长度无效。” [英] Error : "Invalid length for a Base-64 char array."

问题描述

我想用C＃用不同的密钥加密和解密纯文本。

当我运行此代码时，它会给出错误无效

 rijndaelCipher.Key = Convert.FromBase64String（  =code-string> ABC）; 



我也试过

 rijndaelCipher.Key = Encoding.ASCII.GetBytes （  ABC）; 
  //  但它会出现此错误指定的密钥不是此算法的有效大小。 



我的代码是：



 public string EncryptString（string plainText）
 {
 //实例化一个新的RijndaelManaged对象以执行字符串对称加密
 RijndaelManaged rijndaelCipher = new RijndaelManaged（）; 
 
 //设置密钥和IV 
 rijndaelCipher.Key = Convert.FromBase64String（ABC）; //错误在这里
 
 MemoryStream memoryStream = new MemoryStream（）; 
 ICryptoTransform rijndaelEncryptor = rijndaelCipher.CreateEncryptor（）; 
 CryptoStream cryptoStream = new CryptoStream（memoryStream，rijndaelEncryptor，CryptoStreamMode.Write）; 
 byte [] plainBytes = Encoding.ASCII.GetBytes（plainText）; 
 cryptoStream.Write（plainBytes，0，plainBytes.Length）; 
 cryptoStream.FlushFinalBlock（）; 
 byte [] cipherBytes = memoryStream.ToArray（）; 
 
 memoryStream.Close（）; 
 cryptoStream.Close（）; 
 
 string cipherText = Convert.ToBase64String（cipherBytes，0，cipherBytes.Length）; 
返回cipherText; 
} 





每个建议都会有所体现。



问候

Jayanta。

解决方案

通过添加此方法将字符串转换为字节数组解决了这个问题： br />

 私人  static   byte  [] CreateKey（ string 密码）
 {
  var  salt =  new   byte  [] { 1 ， 2 ， 23 ， 234 ， 37 ， 48 ， 134 ， 63 ， 248 ， 4 }; 
 
  const   int  Iterations =  9872 ; 
  var  rfc2898DeriveBytes =  new  Rfc2898DeriveBytes（密码，盐，迭代次数）; 
  return  rfc2898DeriveBytes.GetBytes（ 32 ）; 
 
} 

上一代码是：

 rijndaelCipher.Key = Convert.FromBase64String（ ABC）; 

解码后的代码为：

 rijndaelCipher.Key = CreateKey（ABC）; 

Hi, I want to Encrypt and Decrypt plain Text with C# with different keys.
When I run this code its gives the error Invalid length for a Base-64 char array on

rijndaelCipher.Key = Convert.FromBase64String("ABC");

I also tried

 rijndaelCipher.Key = Encoding.ASCII.GetBytes("ABC");
// but it gives this error "Specified key is not a valid size for this algorithm."

My code is :

public string EncryptString(string plainText)
        {
            // Instantiate a new RijndaelManaged object to perform string symmetric encryption
            RijndaelManaged rijndaelCipher = new RijndaelManaged();

            // Set key and IV
            rijndaelCipher.Key = Convert.FromBase64String("ABC"); //Error is here                       

            MemoryStream memoryStream = new MemoryStream();
            ICryptoTransform rijndaelEncryptor = rijndaelCipher.CreateEncryptor();
            CryptoStream cryptoStream = new CryptoStream(memoryStream, rijndaelEncryptor, CryptoStreamMode.Write);
            byte[] plainBytes = Encoding.ASCII.GetBytes(plainText);
            cryptoStream.Write(plainBytes, 0, plainBytes.Length);
            cryptoStream.FlushFinalBlock();
            byte[] cipherBytes = memoryStream.ToArray();

            memoryStream.Close();
            cryptoStream.Close();

            string cipherText = Convert.ToBase64String(cipherBytes, 0, cipherBytes.Length);
            return cipherText;
        }

Every suggestion would be appreciate.

Regards
Jayanta.

解决方案

Solved this problems by adding this method for converting string to byte array :

private static byte[] CreateKey(string password)
        {
            var salt = new byte[] { 1, 2, 23, 234, 37, 48, 134, 63, 248, 4 };

            const int Iterations = 9872;
            var rfc2898DeriveBytes = new Rfc2898DeriveBytes(password, salt, Iterations);
                return rfc2898DeriveBytes.GetBytes(32);

        }

Previous Code is :

rijndaelCipher.Key = Convert.FromBase64String("ABC");

After solved code is :

rijndaelCipher.Key =CreateKey("ABC");

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