using System;
using System.IO;[s] [/s]
using System.Data;
using System.Text;
using System.Diagnostics;
using System.Security;
using System.Security.Cryptography;

namespace com.Quickline.Encrypt
{
 /// <summary>
 /// 类名：HashEncrypt
 /// 作用：对传入的字符串进行Hash运算，返回通过Hash算法加密过的字串。
 /// 属性：［无］
 /// 构造函数额参数：
 /// IsReturnNum:是否返回为加密后字符的Byte代码
 /// IsCaseSensitive：是否区分大小写。
 /// 方法：此类提供MD5，SHA1，SHA256，SHA512等四种算法，加密字串的长
度依次增大。
 /// </summary>
 public class HashEncrypt
 {
 //private string strIN;
 private bool isReturnNum;
 private bool isCaseSensitive;
 
 public HashEncrypt(bool IsCaseSensitive,bool IsReturnNum)
 {
 this.isReturnNum = IsReturnNum;
 this.isCaseSensitive = IsCaseSensitive;
 }
 
 
 private string getstrIN(string strIN)
 {
 //string strIN = strIN;
 if (strIN.Length == 0)
 {
 strIN = “~NULL~”;
 }
 if (isCaseSensitive == false)
 {
 strIN = strIN.ToUpper();
 }
 return strIN;
 }
 public string MD5Encrypt(string strIN)
 {
 //string strIN = getstrIN(strIN);
 byte[] tmpByte;
 MD5 md5 = new MD5CryptoServiceProvider();
 tmpByte =
md5.ComputeHash(GetKeyByteArray(getstrIN(strIN)));
 md5.Clear();

 return GetStringValue(tmpByte);

 }
 
 public string SHA1Encrypt(string strIN)
 {
 //string strIN = getstrIN(strIN);
 byte[] tmpByte;
 SHA1 sha1 = new SHA1CryptoServiceProvider();

 tmpByte = sha1.ComputeHash(GetKeyByteArray(strIN));
 sha1.Clear();

 return GetStringValue(tmpByte);

 }

 public string SHA256Encrypt(string strIN)
 {
 //string strIN = getstrIN(strIN);
 byte[] tmpByte;
 SHA256 sha256 = new SHA256Managed();

 tmpByte =
sha256.ComputeHash(GetKeyByteArray(strIN));
 sha256.Clear();

 return GetStringValue(tmpByte);

 }

 public string SHA512Encrypt(string strIN)
 {
 //string strIN = getstrIN(strIN);
 byte[] tmpByte;
 SHA512 sha512 = new SHA512Managed();

 tmpByte =
sha512.ComputeHash(GetKeyByteArray(strIN));
 sha512.Clear();

 return GetStringValue(tmpByte);

 }
 
 /// <summary>
 /// 使用DES加密（Added by niehl 2005-4-6）
 /// </summary>
 /// <param name=”originalValue”>待加密的字符串</param>
 /// <param name=”key”>密钥(最大长度8)</param>
 /// <param name=”IV”>初始化向量(最大长度8)</param>
 /// <returns>加密后的字符串</returns>
 public string DESEncrypt(string originalValue,string key,string IV)
 {
 //将key和IV处理成8个字符
 key += “12345678”;
 IV += “12345678”;
 key = key.Substring(0,8);
 IV = IV.Substring(0,8);

 SymmetricAlgorithm sa;
 ICryptoTransform ct;
 MemoryStream ms;
 CryptoStream cs;
 byte[] byt;

 sa = new DESCryptoServiceProvider();
 sa.Key = Encoding.UTF8.GetBytes(key);
 sa.IV = Encoding.UTF8.GetBytes(IV);
 ct = sa.CreateEncryptor();

 byt = Encoding.UTF8.GetBytes(originalValue);

 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());

 }

 public string DESEncrypt(string originalValue,string key)
 {
 return DESEncrypt(originalValue,key,key);
 }

 /// <summary>
 /// 使用DES解密（Added by niehl 2005-4-6）
 /// </summary>
 /// <param name=”encryptedValue”>待解密的字符串</param>
 /// <param name=”key”>密钥(最大长度8)</param>
 /// <param name=”IV”>m初始化向量(最大长度8)</param>
 /// <returns>解密后的字符串</returns>
 public string DESDecrypt(string encryptedValue,string key,string IV)
 {
 //将key和IV处理成8个字符
 key += “12345678”;
 IV += “12345678”;
 key = key.Substring(0,8);
 IV = IV.Substring(0,8);

 SymmetricAlgorithm sa;
 ICryptoTransform ct;
 MemoryStream ms;
 CryptoStream cs;
 byte[] byt;

 sa = new DESCryptoServiceProvider();
 sa.Key = Encoding.UTF8.GetBytes(key);
 sa.IV = Encoding.UTF8.GetBytes(IV);
 ct = sa.CreateDecryptor();

 byt = Convert.FromBase64String(encryptedValue);

 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());

 }

 public string DESDecrypt(string encryptedValue,string key)
 {
 return DESDecrypt(encryptedValue,key,key);
 }

 private string GetStringValue(byte[] Byte)
 {
 string tmpString = “”;

 if (this.isReturnNum == false)
 {
 ASCIIEncoding Asc = new ASCIIEncoding();
 tmpString = Asc.GetString(Byte);
 }
 else
 {
 int iCounter;

 for
(iCounter=0;iCounter<Byte.Length;iCounter++)
 {
 tmpString = tmpString +
Byte[iCounter].ToString();
 }
 
 }
 
 return tmpString;
 }

 private byte[] GetKeyByteArray(string strKey)
 {

 ASCIIEncoding Asc = new ASCIIEncoding();
 
 int tmpStrLen = strKey.Length;
 byte[] tmpByte = new byte[tmpStrLen-1];

 tmpByte = Asc.GetBytes(strKey);

 return tmpByte;

 }

 }
}

本文固定链接: http://www.ntxz.net/?p=648 | 周忞 | 吉心的记事本