C# 加密解密（DES,3DES,MD5,Base64） 类

public sealed class EncryptUtils { #region Base64加密解密 /// <summary> /// Base64加密 /// </summary> /// <param name="input">需要加密的字符串</param> /// <returns></returns> public static string Base64Encrypt( string input) { return Base64Encrypt(input, new UTF8Encoding()); } /// <summary> /// Base64加密 /// </summary> /// <param name="input">需要加密的字符串</param> /// <param name="encode">字符编码</param> /// <returns></returns> public static string Base64Encrypt( string input, Encoding encode) { return Convert.ToBase64String(encode.GetBytes(input)); } /// <summary> /// Base64解密 /// </summary> /// <param name="input">需要解密的字符串</param> /// <returns></returns> public static string Base64Decrypt( string input) { return Base64Decrypt(input, new UTF8Encoding()); } /// <summary> /// Base64解密 /// </summary> /// <param name="input">需要解密的字符串</param> /// <param name="encode">字符的编码</param> /// <returns></returns> public static string Base64Decrypt( string input, Encoding encode) { return encode.GetString(Convert.FromBase64String(input)); } #endregion #region DES加密解密 /// <summary> /// DES加密 /// </summary> /// <param name="data">加密数据</param> /// <param name="key">8位字符的密钥字符串</param> /// <param name="iv">8位字符的初始化向量字符串</param> /// <returns></returns> public static string DESEncrypt( string data, string key, string iv) { byte [] byKey = System.Text.ASCIIEncoding.ASCII.GetBytes(key); byte [] byIV = System.Text.ASCIIEncoding.ASCII.GetBytes(iv); DESCryptoServiceProvider cryptoProvider = new DESCryptoServiceProvider(); int i = cryptoProvider.KeySize; MemoryStream ms = new MemoryStream(); CryptoStream cst = new CryptoStream(ms, cryptoProvider.CreateEncryptor(byKey, byIV), CryptoStreamMode.Write); StreamWriter sw = new StreamWriter(cst); sw.Write(data); sw.Flush(); cst.FlushFinalBlock(); sw.Flush(); return Convert.ToBase64String(ms.GetBuffer(), 0, ( int )ms.Length); } /// <summary> /// DES解密 /// </summary> /// <param name="data">解密数据</param> /// <param name="key">8位字符的密钥字符串(需要和加密时相同)</param> /// <param name="iv">8位字符的初始化向量字符串(需要和加密时相同)</param> /// <returns></returns> public static string DESDecrypt( string data, string key, string iv) { byte [] byKey = System.Text.ASCIIEncoding.ASCII.GetBytes(key); byte [] byIV = System.Text.ASCIIEncoding.ASCII.GetBytes(iv); byte [] byEnc; try { byEnc = Convert.FromBase64String(data); } catch { return null ; } DESCryptoServiceProvider cryptoProvider = new DESCryptoServiceProvider(); MemoryStream ms = new MemoryStream(byEnc); CryptoStream cst = new CryptoStream(ms, cryptoProvider.CreateDecryptor(byKey, byIV), CryptoStreamMode.Read); StreamReader sr = new StreamReader(cst); return sr.ReadToEnd(); } #endregion #region MD5加密 /// <summary> /// MD5加密 /// </summary> /// <param name="input">需要加密的字符串</param> /// <returns></returns> public static string MD5Encrypt( string input) { return MD5Encrypt(input, new UTF8Encoding()); } /// <summary> /// MD5加密 /// </summary> /// <param name="input">需要加密的字符串</param> /// <param name="encode">字符的编码</param> /// <returns></returns> public static string MD5Encrypt( string input, Encoding encode) { MD5 md5 = new MD5CryptoServiceProvider(); byte [] t = md5.ComputeHash(encode.GetBytes(input)); StringBuilder sb = new StringBuilder(32); for ( int i = 0; i < t.Length; i++) sb.Append(t[i].ToString( "x" ).PadLeft(2, '0' )); return sb.ToString(); } /// <summary> /// MD5对文件流加密 /// </summary> /// <param name="sr"></param> /// <returns></returns> public static string MD5Encrypt(Stream stream) { MD5 md5serv = MD5CryptoServiceProvider.Create(); byte [] buffer = md5serv.ComputeHash(stream); StringBuilder sb = new StringBuilder(); foreach ( byte var in buffer) sb.Append( var .ToString( "x2" )); return sb.ToString(); } /// <summary> /// MD5加密(返回16位加密串) /// </summary> /// <param name="input"></param> /// <param name="encode"></param> /// <returns></returns> public static string MD5Encrypt16( string input, Encoding encode) { MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider(); string result = BitConverter.ToString(md5.ComputeHash(encode.GetBytes(input)), 4, 8); result = result.Replace( "-" , "" ); return result; } #endregion #region 3DES 加密解密 public static string DES3Encrypt( string data, string key) { TripleDESCryptoServiceProvider DES = new TripleDESCryptoServiceProvider(); DES.Key = ASCIIEncoding.ASCII.GetBytes(key); DES.Mode = CipherMode.CBC; DES.Padding = PaddingMode.PKCS7; ICryptoTransform DESEncrypt = DES.CreateEncryptor(); byte [] Buffer = ASCIIEncoding.ASCII.GetBytes(data); return Convert.ToBase64String(DESEncrypt.TransformFinalBlock(Buffer, 0, Buffer.Length)); } public static string DES3Decrypt( string data, string key) { TripleDESCryptoServiceProvider DES = new TripleDESCryptoServiceProvider(); DES.Key = ASCIIEncoding.ASCII.GetBytes(key); DES.Mode = CipherMode.CBC; DES.Padding = System.Security.Cryptography.PaddingMode.PKCS7; ICryptoTransform DESDecrypt = DES.CreateDecryptor(); string result = "" ; try { byte [] Buffer = Convert.FromBase64String(data); result = ASCIIEncoding.ASCII.GetString(DESDecrypt.TransformFinalBlock(Buffer, 0, Buffer.Length)); } catch (Exception e) { } return result; } #endregion }