C#实现AES、3DES加密解密

AES

 1       /// <summary>
 2         ///  AES 加密
 3         /// </summary>
 4         /// <param name="str">明文（待加密）</param>
 5         /// <param name="key">密文</param>
 6         /// <returns></returns>
 7         public static string AesEncrypt(string str, string key)
 8         {
 9             if (string.IsNullOrEmpty(str)) return null;
10             Byte[] toEncryptArray = Encoding.UTF8.GetBytes(str);
11 
12             System.Security.Cryptography.RijndaelManaged rm = new System.Security.Cryptography.RijndaelManaged
13             {
14                 Key = Encoding.UTF8.GetBytes(key),
15                 Mode = System.Security.Cryptography.CipherMode.ECB,
16                 Padding = System.Security.Cryptography.PaddingMode.PKCS7
17             };
18 
19             System.Security.Cryptography.ICryptoTransform cTransform = rm.CreateEncryptor();
20             Byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);
21 
22             return Convert.ToBase64String(resultArray, 0, resultArray.Length);
23         }
24         /// <summary>
25         ///  AES 解密
26         /// </summary>
27         /// <param name="str">明文（待解密）</param>
28         /// <param name="key">密文</param>
29         /// <returns></returns>
30         public static string AesDecrypt(string str, string key)
31         {
32             if (string.IsNullOrEmpty(str)) return null;
33             Byte[] toEncryptArray = Convert.FromBase64String(str);
34 
35             System.Security.Cryptography.RijndaelManaged rm = new System.Security.Cryptography.RijndaelManaged
36             {
37                 Key = Encoding.UTF8.GetBytes(key),
38                 Mode = System.Security.Cryptography.CipherMode.ECB,
39                 Padding = System.Security.Cryptography.PaddingMode.PKCS7
40             };
41 
42             System.Security.Cryptography.ICryptoTransform cTransform = rm.CreateDecryptor();
43             Byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);
44 
45             return Encoding.UTF8.GetString(resultArray);
46         }

如果提示key不是有效位数，需要转换

            byte[] keyArray = null;
            using (var sha1 = new SHA1CryptoServiceProvider())
            {
                byte[] hash = sha1.ComputeHash(Encoding.UTF8.GetBytes(key));
                var rd = sha1.ComputeHash(hash);
                keyArray = rd.Take(16).ToArray();
            }

3DES

        public static string Encrypt3DES(string text, string key)
        {
            TripleDESCryptoServiceProvider tripleDes = new TripleDESCryptoServiceProvider();
            byte[] inputArray = Encoding.UTF8.GetBytes(text);
            tripleDes.Key = Encoding.UTF8.GetBytes(key);
            tripleDes.Mode = CipherMode.ECB;
            tripleDes.Padding = PaddingMode.PKCS7;
            ICryptoTransform cTransform = tripleDes.CreateEncryptor();
            byte[] resultArray = cTransform.TransformFinalBlock(inputArray, 0, inputArray.Length);
            tripleDes.Clear();
            return Convert.ToBase64String(resultArray, 0, resultArray.Length);
        }

        public static string Decrypt3DES(string input, string key)
        {
            byte[] inputArray = Convert.FromBase64String(input);
            TripleDESCryptoServiceProvider tripleDes = new TripleDESCryptoServiceProvider();
            tripleDes.Key = Encoding.UTF8.GetBytes(key);
            tripleDes.Mode = CipherMode.ECB;
            tripleDes.Padding = PaddingMode.PKCS7;
            ICryptoTransform cTransform = tripleDes.CreateDecryptor();
            byte[] resultArray = cTransform.TransformFinalBlock(inputArray, 0, inputArray.Length);
            tripleDes.Clear();
            return Encoding.UTF8.GetString(resultArray);
        }

　　

posted on 2021-11-18 08:50  stiet  阅读(253)  评论(0)    收藏  举报