/// <summary>///  DES算法描述简介：///  DES是Data Encryption Standard（数据加密标准）的缩写。它是由IBM公司研制的一种加密算法，/// 美国国家标准局于1977年公布把它作为非机要部门使用的数据加密标准；/// 它是一个分组加密算法，他以64位为分组对数据加密。/// 同时DES也是一个对称算法：加密和解密用的是同一个算法。/// 它的密匙长度是56位（因为每个第8 位都用作奇偶校验），/// 密匙可以是任意的56位的数，而且可以任意时候改变．/// </summary>private static byte[] IV = { 0x14, 0xFC, 0x29, 0xC8, 0x9A, 0xCB, 0xCA, 0xE7 };//加密IV向量public static String Encrypt(String Key, String str){byte[] bKey = Encoding.UTF8.GetBytes(Key.Substring(0, 8));byte[] bIV = IV;byte[] bStr = Encoding.UTF8.GetBytes(str);try    {        DESCryptoServiceProvider desc = new DESCryptoServiceProvider();        MemoryStream mStream = new MemoryStream();        CryptoStream cStream = new CryptoStream(mStream, desc.CreateEncryptor(bKey, bIV), CryptoStreamMode.Write);        cStream.Write(bStr, 0, bStr.Length);        cStream.FlushFinalBlock();return Convert.ToBase64String(mStream.ToArray());    }catch    {return string.Empty;    }}

public static String Decrypt(String Key, String DecryptStr){try    {byte[] bKey = Encoding.UTF8.GetBytes(Key.Substring(0, 8));byte[] bIV = IV;byte[] bStr = Convert.FromBase64String(DecryptStr);        DESCryptoServiceProvider desc = new DESCryptoServiceProvider();        MemoryStream mStream = new MemoryStream();        CryptoStream cStream = new CryptoStream(mStream, desc.CreateDecryptor(bKey, bIV), CryptoStreamMode.Write);        cStream.Write(bStr, 0, bStr.Length);        cStream.FlushFinalBlock();return Encoding.UTF8.GetString(mStream.ToArray());    }catch    {return string.Empty;    }}

 1 /// <summary> 2 /// MD5加密 3 /// </summary> 4 private static string GetMd5(string md5) 5 { 6     System.Security.Cryptography.MD5CryptoServiceProvider md = new System.Security.Cryptography.MD5CryptoServiceProvider(); 7     byte[] value, hash; 8     value = System.Text.Encoding.UTF8.GetBytes(md5); 9     hash = md.ComputeHash(value);10     md.Clear();11     string temp = "";12     for (int i = 0, len = hash.Length; i < len; i++)13     {14         temp += hash[i].ToString("X").PadLeft(2, '0');15     }16     return temp;17 }18 19 /// <summary>20 /// SHA1加密21 /// </summary>22 private static string Get_SHA1(string strSource)23 {24     System.Security.Cryptography.SHA1 sha = new System.Security.Cryptography.SHA1CryptoServiceProvider();25     byte[] bytResult = sha.ComputeHash(System.Text.Encoding.Default.GetBytes(strSource));26     //转换成字符串，32位  27     string strResult = BitConverter.ToString(bytResult);28     //BitConverter转换出来的字符串会在每个字符中间产生一个分隔符，需要去除掉  29     strResult = strResult.Replace("-", "");30     return strResult;31 }