c# MD5加密

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using System; using System.Collections.Generic; using System.Linq; using System.Security.Cryptography; using System.Text; using System.Threading.Tasks; /****************************** * 概要：MD5加密 * 设计者：DuanXuWen * 时间：20180309 * 版本：0.1 * 修改者： * 修改时间： * ***************************/

namespace Common { public class EncrypHelper { /// <summary> ///静态无参构造 /// </summary> static EncrypHelper() { //默认的密钥 SecretKey = “HelloWorld..!!”; }

/// <summary> /// 使用SHA256加密字符串 /// </summary> /// <param name=”Source”></param> /// <returns></returns> public static string EncrypToSHA(string Source) { SHA256Managed sha256 = new SHA256Managed(); byte[] s = UTF8Encoding.UTF8.GetBytes(Source); byte[] t = sha256.ComputeHash(s); return Convert.ToBase64String(t); }

/// <summary> /// MD5加密(32位) /// </summary> /// <param name=”str”>加密字符</param> /// <returns></returns> public static string encrypt(string str) { string cl = str; string pwd = “”; MD5 md5 = MD5.Create(); byte[] s = md5.ComputeHash(Encoding.UTF8.GetBytes(cl)); for (int i = 0; i < s.Length; i++) { pwd = pwd + s[i].ToString(“X”); } return pwd; }

/// <summary> /// 缺省的密钥 /// </summary> public static readonly string SecretKey;

/// <summary> /// 使用缺省密钥字符串加密string /// </summary> /// <param name=”original”>明文</param> /// <returns>密文</returns> public static string Encrypt(string original) { return Encrypt(original, SecretKey); }

/// <summary> /// 使用缺省密钥字符串解密string /// </summary> /// <param name=”original”>密文</param> /// <returns>明文</returns> public static string Decrypt(string original) { return Decrypt(original, SecretKey, System.Text.Encoding.Default); }

/// <summary> /// 使用给定密钥字符串加密string /// </summary> /// <param name=”original”>原始文字</param> /// <param name=”key”>密钥</param> /// <returns>密文</returns> public static string Encrypt(string original, string key) { byte[] buff = System.Text.Encoding.Default.GetBytes(original); byte[] kb = System.Text.Encoding.Default.GetBytes(key); return Convert.ToBase64String(Encrypt(buff, kb)); }

/// <summary> /// 使用给定密钥字符串解密string /// </summary> /// <param name=”original”>密文</param> /// <param name=”key”>密钥</param> /// <returns>明文</returns> public static string Decrypt(string original, string key) { return Decrypt(original, key, System.Text.Encoding.Default); }

/// <summary> /// 使用给定密钥字符串解密string,返回指定编码方式明文 /// </summary> /// <param name=”encrypted”>密文</param> /// <param name=”key”>密钥</param> /// <param name=”encoding”>字符编码方案</param> /// <returns>明文</returns> public static string Decrypt(string encrypted, string key, Encoding encoding) { byte[] buff = Convert.FromBase64String(encrypted); byte[] kb = System.Text.Encoding.Default.GetBytes(key); return encoding.GetString(Decrypt(buff, kb)); }

/// <summary> /// 生成MD5摘要 /// </summary> /// <param name=”original”>数据源</param> /// <returns>摘要</returns> public static byte[] MakeMd5(byte[] original) { MD5CryptoServiceProvider hashmd5 = new MD5CryptoServiceProvider(); byte[] keyhash = hashmd5.ComputeHash(original); hashmd5 = null; return keyhash; }

/// <summary> /// 使用给定密钥加密 /// </summary> /// <param name=”original”>明文</param> /// <param name=”key”>密钥</param> /// <returns>密文</returns> public static byte[] Encrypt(byte[] original, byte[] key) { TripleDESCryptoServiceProvider des = new TripleDESCryptoServiceProvider(); des.Key = MakeMd5(key); des.Mode = CipherMode.ECB; return des.CreateEncryptor().TransformFinalBlock(original, 0, original.Length); }

/// <summary> /// 使用给定密钥解密数据 /// </summary> /// <param name=”encrypted”>密文</param> /// <param name=”key”>密钥</param> /// <returns>明文</returns> public static byte[] Decrypt(byte[] encrypted, byte[] key) { TripleDESCryptoServiceProvider des = new TripleDESCryptoServiceProvider(); des.Key = MakeMd5(key); des.Mode = CipherMode.ECB; return des.CreateDecryptor().TransformFinalBlock(encrypted, 0, encrypted.Length); } } }

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