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DotNet中用到的加密算法总结

来源：网络收集作者：佚名时间：2007-04-25 23:37:29

1public class CryptUtil
2    {
3        public static string DecryptString(string input)
4        {
5            if (input.Equals(string.Empty))
6            {
7                return input;
8            }
9
10            byte[] byKey = {0x63, 0x68, 0x65, 0x6E, 0x79, 0x75, 0x61, 0x6E};
11            byte[] IV = {0xFE, 0xDC, 0xBA, 0x98, 0x76, 0x54, 0x32, 0x10};
12            byte[] inputByteArray = new Byte[input.Length];
13            DESCryptoServiceProvider des = new DESCryptoServiceProvider();
14            inputByteArray = Convert.FromBase64String(input);
15            MemoryStream ms = new MemoryStream();
16            CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(byKey, IV), CryptoStreamMode.Write);
17            cs.Write(inputByteArray, 0, inputByteArray.Length);
18            cs.FlushFinalBlock();
19            Encoding encoding = new UTF8Encoding();
20            return encoding.GetString(ms.ToArray());
21        }
22
23        public static string EncryptString(string input)
24        {
25            if (input.Equals(string.Empty))
26            {
27                return input;
28            }
29
30            byte[] byKey = {0x63, 0x68, 0x65, 0x6E, 0x79, 0x75, 0x61, 0x6E};
31            byte[] IV = {0xFE, 0xDC, 0xBA, 0x98, 0x76, 0x54, 0x32, 0x10};
32            DESCryptoServiceProvider des = new DESCryptoServiceProvider();
33            byte[] inputByteArray = Encoding.UTF8.GetBytes(input);
34            MemoryStream ms = new MemoryStream();
35            CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(byKey, IV), CryptoStreamMode.Write);
36            cs.Write(inputByteArray, 0, inputByteArray.Length);
37            cs.FlushFinalBlock();
38            return Convert.ToBase64String(ms.ToArray());
39        }
40        /**//// <summary>
41        /// DES + Base64 加密
42        /// </summary>
43        /// <param name="input">明文字符串</param>
44        /// <returns>已加密字符串</returns>
45        public static string DesBase64Encrypt(string input)
46        {
47            System.Security.Cryptography.DES des = System.Security.Cryptography.DES.Create();
48            des.Mode = System.Security.Cryptography.CipherMode.ECB;
49            ICryptoTransform ct;
50            MemoryStream ms;