C ＃ symmetric encryption (AES encryption) ciphertext results generated each time, different ideas, code sharing

Ideas ： Use random vectors , Put the random vector into the ciphertext , Before intercepting from the ciphertext each time decryption 16 position , In fact, it is the random vector we encrypted before .

Code

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        public static string Encrypt(string plainText, string AESKey)
        
{
        
    RijndaelManaged rijndaelCipher = new RijndaelManaged();
        
    byte[] inputByteArray = Encoding.UTF8.GetBytes(plainText);// Get the byte array to be encrypted  
        
    rijndaelCipher.Key = Convert.FromBase64String(AESKey);// The encryption and decryption parties agree on the key ：AESKey
        
    rijndaelCipher.GenerateIV();
        
    byte[] keyIv = rijndaelCipher.IV;
        
    byte[] cipherBytes = null;
        
    using (MemoryStream ms = new MemoryStream())
        
    {
        
        using (CryptoStream cs = new CryptoStream(ms, rijndaelCipher.CreateEncryptor(), CryptoStreamMode.Write))
        
        {
        
            cs.Write(inputByteArray, 0, inputByteArray.Length);
        
            cs.FlushFinalBlock();
        
            cipherBytes = ms.ToArray();// Get the encrypted byte array 
        
            cs.Close();
        
            ms.Close();
        
        }
        
    }
        
    var allEncrypt = new byte[keyIv.Length + cipherBytes.Length];
        
    Buffer.BlockCopy(keyIv, 0, allEncrypt, 0, keyIv.Length);
        
    Buffer.BlockCopy(cipherBytes, 0, allEncrypt, keyIv.Length * sizeof(byte), cipherBytes.Length);
        
    return Convert.ToBase64String(allEncrypt);
        
}
        

        
public static string Decrypt(string showText, string AESKey)
        
{
        
    string result = string.Empty;
        
    try
        
    {
        
        byte[] cipherText = Convert.FromBase64String(showText);
        
        int length = cipherText.Length;
        
        SymmetricAlgorithm rijndaelCipher = Rijndael.Create();
        
        rijndaelCipher.Key = Convert.FromBase64String(AESKey);// The encryption and decryption key agreed by both parties 
        
        byte[] iv = new byte[16];
        
        Buffer.BlockCopy(cipherText, 0, iv, 0, 16);
        
        rijndaelCipher.IV = iv;
        
        byte[] decryptBytes = new byte[length - 16];
        
        byte[] passwdText = new byte[length - 16];
        
        Buffer.BlockCopy(cipherText, 16, passwdText, 0, length - 16);
        
        using (MemoryStream ms = new MemoryStream(passwdText))
        
        {
        
            using (CryptoStream cs = new CryptoStream(ms, rijndaelCipher.CreateDecryptor(), CryptoStreamMode.Read))
        
            {
        
                cs.Read(decryptBytes, 0, decryptBytes.Length);
        
                cs.Close();
        
                ms.Close();
        
            }
        
        }
        
        result = Encoding.UTF8.GetString(decryptBytes).Replace("\0", "");   /// End of string '\0' Get rid of 
        
    }
        
    catch { }
        
    return result;
        
}
       
       

        
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call ：

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        string jiaMi = MyAESTools.Encrypt(textBox1.Text, "abcdefgh12345678abcdefgh12345678");
        

        
string jieMi = MyAESTools.Decrypt(textBox3.Text, "abcdefgh12345678abcdefgh12345678");
       
       

        
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