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一个可逆的DES和TripleDES方式加密类（downmoon原创)
using System;using System.Security;using System.Security.Cryptography;using System.IO;using System.Text;namespace EncryptDownmoon
...{
/**//// <summary>
/// EncryptSqlConn 的摘要说明。
/// </summary> public class EncryptSqlConn ...{ public EncryptSqlConn() ...{ if(mCSP ==null) ...{ mCSP = SetEnc(); } } /**//// <summary> /// 设置加密方式，0为DES，1为TripleDES /// </summary> /// <returns></returns> public EncryptSqlConn(int EnMethod) ...{ if(EnMethod==0) ...{ lngEnMethod=0; } else ...{ lngEnMethod=1; } if(mCSP ==null) ...{ mCSP = SetEnc(); } } 方法#region 方法 private SymmetricAlgorithm mCSP; private int m_lngEnMethod=0; /**//// <summary> /// 加密方式，0为DES，1为TripleDES /// </summary> public int lngEnMethod ...{ get ...{ return m_lngEnMethod; } set ...{ m_lngEnMethod=value; } } private SymmetricAlgorithm SetEnc() ...{ if(lngEnMethod==0) ...{ return new DESCryptoServiceProvider(); } else return new TripleDESCryptoServiceProvider(); } //测试键值 private string genKeyValue ...{ get ...{ mCSP.GenerateKey(); return Convert.ToBase64String(mCSP.Key); } } //测试IV值 private string genIVValue ...{ get ...{ mCSP.GenerateIV(); return Convert.ToBase64String(mCSP.IV); } } /**//// <summary> /// 加密字串 /// </summary> /// <param name="Value"></param> /// <returns></returns> public string EncryptString(string Value) ...{ ICryptoTransform ct; MemoryStream ms; CryptoStream cs; byte[] byt; ct = mCSP.CreateEncryptor(mCSP.Key, mCSP.IV); //ct = mCSP.CreateEncryptor(genKeyValue,genIVValue); byt = Encoding.UTF8.GetBytes(Value); ms = new MemoryStream(); cs = new CryptoStream(ms, ct, CryptoStreamMode.Write); cs.Write(byt, 0, byt.Length); cs.FlushFinalBlock(); cs.Close(); return Convert.ToBase64String(ms.ToArray()); } /**//// <summary> /// 解密字串 /// </summary> /// <param name="Value"></param> /// <returns></returns> public string DecryptString(string Value) ...{ ICryptoTransform ct; MemoryStream ms; CryptoStream cs; byte[] byt; ct = mCSP.CreateDecryptor(mCSP.Key, mCSP.IV); //ct = mCSP.CreateDecryptor(genKeyValue, genIVValue); byt = Convert.FromBase64String(Value); ms = new MemoryStream(); cs = new CryptoStream(ms, ct, CryptoStreamMode.Write); cs.Write(byt, 0, byt.Length); cs.FlushFinalBlock(); cs.Close(); return Encoding.UTF8.GetString(ms.ToArray()); } #endregion }
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