简单的不用系统函数的加密解密函数，支持中文

短命女 2022-09-30 06:26 25阅读 0赞

using System;  
using System.Collections.Generic;  
using System.Text;

namespace TestSilverlight  
\{  
/\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*  
\* 公共类（加解密）  
\* Copyright (C) 2008-2009 By 石家庄云天信息技术有限公司  
\* songjh20080616(创建标识)

\* 修改标识  
\* 修改描述

\* 修改标识  
\* 修改描述  
\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*/

public class PassWord  
\{  
private PassWord()  
\{  
  
\}

public static byte\[\] DecryptByte(byte\[\] dd, string key)  
\{  
return ASCIIEncoding.Default.GetBytes(Decrypt(ASCIIEncoding.Default.GetString(dd), key));  
\}

public static byte\[\] EncryptByte(byte\[\] dd, string key)  
\{  
return ASCIIEncoding.Default.GetBytes(Encrypt(ASCIIEncoding.Default.GetString(dd), key));  
\}

/// <summary>  
/// 解密程序  
/// </summary>  
/// <param name="dd">加密的密码</param>  
/// <returns>解密后的密码</returns>  
public static string Decrypt(string dd,string key)  
\{  
byte\[\] encbuff = System.Text.Encoding.UTF8.GetBytes(source);  
string dd = Convert.ToBase64String(encbuff);

string vkey = key; //  
int vkeylen = vkey.Length;  
int vKeyPos = 0;  
int vSrcPos = 0;  
int vSrcAsc = 0;  
int vTmpSrcAsc = 0;  
string vDest = "";  
string ff = dd.Substring(0, 2);  
int ddddd = Convert.ToInt32(ff, 16);  
string fff = Convert.ToString(ddddd, 10);  
int vOffset = Convert.ToInt32(fff);

vSrcPos = 2;  
while (vSrcPos < dd.Length)  
\{  
int eee = Convert.ToInt32(dd.Substring(vSrcPos, 2), 16);

vSrcAsc = Convert.ToInt32(Convert.ToString(eee, 10));  
if (vKeyPos < vkeylen)  
\{  
vKeyPos = vKeyPos + 1;  
\}  
else  
\{  
vKeyPos = 1;  
\}  
char ddddff = (vkey\[vKeyPos - 1\]);  
//vKeyPos = vKeyPos - 1;  
vTmpSrcAsc = vSrcAsc ^ (int)(vkey\[vKeyPos - 1\]);  
if (vTmpSrcAsc <= vOffset)  
\{  
vTmpSrcAsc = 255 + vTmpSrcAsc - vOffset;  
\}  
else  
\{  
vTmpSrcAsc = vTmpSrcAsc - vOffset;  
\}

vDest = vDest + (char)(vTmpSrcAsc);  
vOffset = vSrcAsc;  
vSrcPos = vSrcPos + 2;  
\}  
byte\[\] decbuff = Convert.FromBase64String(vDest);  
return System.Text.Encoding.UTF8.GetString(decbuff);  
\}

/// <summary>  
/// 加密程序  
/// </summary>  
/// <param name="dd">要加密的字符串</param>  
/// <returns>加密后的字符串</returns>  
public static string Encrypt(string source, string key)  
\{  
byte\[\] encbuff = System.Text.Encoding.UTF8.GetBytes(source);  
string dd = Convert.ToBase64String(encbuff);

string vkey = key; //"zhangzengbao"  
int vkeylen = vkey.Length;  
int vKeyPos = 0;  
int vSrcAsc = 0;  
int vRange = 256;  
int voffset = 0;  
string vDest = "";  
Random ro = new Random();  
voffset = ro.Next(vRange);  
//voffset = ro.Next(17, 256);

vDest = Convert.ToString(voffset, 16);  
if (vDest.Length < 2)  
\{  
vDest = "0" + vDest;  
\}  
for (int i = 0; i < dd.Length; i++)  
\{  
//byte\[\] B = Encoding.ASCII.GetBytes(a);  
// byte\[\] b = Encoding.ASCII.GetBytes(dd\[i\].ToString());  
// int bb =(int) b\[0\];  
vSrcAsc = ((int)dd\[i\] + voffset) % 255;//求模  
// vSrcAsc = (bb + voffset) % 255;  
if (vKeyPos < vkeylen)  
\{  
vKeyPos = vKeyPos + 1;  
\}  
else  
\{  
vKeyPos = 1;  
\}

vRange = (int)(vkey\[vKeyPos - 1\]);  
//byte\[\] c = Encoding.ASCII.GetBytes(vkey\[vKeyPos - 1\].ToString());  
// int cc = (int)c\[0\];  
//vRange = cc;  
vSrcAsc = vSrcAsc ^ vRange;  
string v1 = Convert.ToString(vSrcAsc, 16);  
if (v1.Length < 2)  
\{  
v1 = "0" + v1;  
\}  
vDest = vDest + v1;

voffset = vSrcAsc;

\}  
vDest = vDest.ToUpper();

return vDest;  
\}  
\}  
\}

//简单的使用系统加密解密函数实现的加密解密函数  
//

//using System;  
//using System.Text;  
//using System.Globalization;  
//using System.Security.Cryptography;  
//using System.Windows.Forms;

//namespace TestSilverlight  
//\{  
// public class TestEncrypt  
// \{  
// /// <summary>  
// /// 构造方法  
// /// </summary>  
// public TestEncrypt()  
// \{  
// \}

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

// /// <summary>  
// /// 使用缺省密钥解密  
// /// </summary>  
// /// <param name="original">密文</param>  
// /// <returns>明文</returns>  
// public static string Decrypt(string original)  
// \{  
// return Decrypt(original,"JASONHEUNG",System.Text.Encoding.Default);  
// \}

// /// <summary>  
// /// 使用给定密钥解密  
// /// </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>  
// /// 使用缺省密钥解密,返回指定编码方式明文  
// /// </summary>  
// /// <param name="original">密文</param>  
// /// <param name="encoding">编码方式</param>  
// /// <returns>明文</returns>  
// public static string Decrypt(string original,Encoding encoding)  
// \{  
// return Decrypt(original,"JASONHEUNG",encoding);  
// \}

// /// <summary>  
// /// 使用给定密钥加密  
// /// </summary>  
// /// <param name="original">原始文字</param>  
// /// <param name="key">密钥</param>  
// /// <param name="encoding">字符编码方案</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>  
// /// 使用给定密钥解密  
// /// </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);  
// \}

// /// <summary>  
// /// 使用缺省密钥加密  
// /// </summary>  
// /// <param name="original">原始数据</param>  
// /// <param name="key">密钥</param>  
// /// <returns>密文</returns>  
// public static byte\[\] Encrypt(byte\[\] original)  
// \{  
// byte\[\] key = System.Text.Encoding.Default.GetBytes("JASONHEUNG");  
// return Encrypt(original,key);  
// \}

// /// <summary>  
// /// 使用缺省密钥解密数据  
// /// </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 = System.Text.Encoding.Default.GetBytes("JASONHEUNG");  
// return Decrypt(encrypted,key);  
// \}  
// \}  
//\}