Des加密解密（公共方法）

冷不防 2023-08-17 16:18 138阅读 0赞

1 public class Des
     2     {
     3         public static string Encrypt(string message, string key)
     4         {
     5             DES des = new DESCryptoServiceProvider();
     6             des.Key = Encoding.UTF8.GetBytes(key);
     7             des.IV = Encoding.UTF8.GetBytes(key);
     8             //des.Mode = CipherMode.ECB;
     9 
    10             byte[] inputByteArray = Encoding.UTF8.GetBytes(message);
    11 
    12             System.IO.MemoryStream ms = new System.IO.MemoryStream();
    13             CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);
    14             cs.Write(inputByteArray, 0, inputByteArray.Length);
    15             cs.FlushFinalBlock();
    16             ms.Close();
    17             StringBuilder ret = new StringBuilder();
    18             foreach (byte b in ms.ToArray())
    19             {
    20                 ret.AppendFormat("{0:X2}", b);
    21             }
    22             return ret.ToString();
    23 
    24         }
    25 
    26         //DES解密
    27         public static string Decrypt(string content, string key)
    28         {
    29             try
    30             {
    31                 DESCryptoServiceProvider provider = new DESCryptoServiceProvider();
    32                 // 密钥
    33                 provider.Key = Encoding.UTF8.GetBytes(key);
    34                 // 偏移量
    35                 provider.IV = Encoding.UTF8.GetBytes(key);
    36                 byte[] buffer = new byte[content.Length / 2];
    37                 for (int i = 0; i < (content.Length / 2); i++)
    38                 {
    39                     int num2 = Convert.ToInt32(content.Substring(i * 2, 2), 0x10);
    40                     buffer[i] = (byte)num2;
    41                 }
    42                 using(MemoryStream stream = new MemoryStream())
    43                 {
    44                     CryptoStream stream2 = new CryptoStream(stream, provider.CreateDecryptor(), CryptoStreamMode.Write);
    45                     stream2.Write(buffer, 0, buffer.Length);
    46                     stream2.FlushFinalBlock();
    47                     stream.Close();
    48                     return Encoding.UTF8.GetString(stream.ToArray());
    49                 }
    50             }
    51             catch (Exception) { return ""; }
    52         }
    53     }

转载于:https://www.cnblogs.com/hugeboke/p/11574831.html