C# · 12月 28, 2021

C#对称加密(AES加密)每次生成的结果都不同的实现思路和代码实例

思路:使用随机向量,把随机向量放入密文中,每次解密时从密文中截取前16位,其实就是我们之前加密的随机向量。

代码:

public static string Encrypt(string plainText,string AESKey){ RijndaelManaged rijndaelCipher = new RijndaelManaged(); byte[] inputByteArray = Encoding.UTF8.GetBytes(plainText);//得到需要加密的字节数组 rijndaelCipher.Key = Convert.FromBase64String(AESKey);//加解密双方约定好密钥: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,inputByteArray.Length); cs.FlushFinalBlock(); cipherBytes = ms.ToArray();//得到加密后的字节数组 cs.Close(); ms.Close(); } } var allEncrypt = new byte[keyIv.Length + cipherBytes.Length]; Buffer.BlockCopy(keyIv,allEncrypt,keyIv.Length); Buffer.BlockCopy(cipherBytes,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);//加解密双方约定好的密钥 byte[] iv = new byte[16]; Buffer.BlockCopy(cipherText,iv,16); rijndaelCipher.IV = iv; byte[] decryptBytes = new byte[length – 16]; byte[] passwdText = new byte[length – 16]; Buffer.BlockCopy(cipherText,16,passwdText,length – 16); using (MemoryStream ms = new MemoryStream(passwdText)) { using (CryptoStream cs = new CryptoStream(ms,rijndaelCipher.CreateDecryptor(),CryptoStreamMode.Read)) { cs.Read(decryptBytes,decryptBytes.Length); cs.Close(); ms.Close(); } } result = Encoding.UTF8.GetString(decryptBytes).Replace(“\0″,””); ///将字符串后尾的’\0’去掉 } catch { } return result;}

调用:

string jiaMi = MyAESTools.Encrypt(text@R_141_2419@1.Text,”abcdefgh12345678abcdefgh12345678″); string jieMi = MyAESTools.Decrypt(text@R_141_2419@3.Text,”abcdefgh12345678abcdefgh12345678″);