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C# base64加密解密完整代码(支持中文,全角符号)(轉)  

2009-06-24 10:22:38|  分类: HTML |  标签: |举报 |字号 订阅

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接上两次:
http://hi.baidu.com/dream0xdl/blog/item/8afbb544b66d7281b2b7dce6.html

http://hi.baidu.com/dream0xdl/blog/item/5b051df799b19521730eec68.html

/*改写了算法,参考了hzqedison在"网页加解密.html"中的相关代码(他的while语句用得很好,处理字符映射关系也比我的好,哪像我没头没脑的搞那么复杂,原创是否是他我也不知道,那个网页我是从小G那边发现的)(方法名,变量名等均未改变俺比较懒,(out在C#中是关键字故改为大写)),另发现C#在这个程序上用到的方法比jscript少,也较容易,前次搞那么复杂,感觉自己好笨,为什么俺就不能早点看到那个网页呢?真郁闷,还好现在一切都解决了
*/
using System;using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
namespace base64_
{
       public partial class Form1 : Form
       {
           public Form1()
           {
               InitializeComponent();
           }
           string base64EncodeChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";//编码后的字符集
           int[] base64DecodeChars = new int[] { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1, -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1 };//对应ASICC字符的位置
           string base64encode(string str)
           { //加密
               string Out = "";
               int i = 0, len = str.Length;
               char c1, c2, c3;
               while (i < len)
               {
                   c1 = Convert.ToChar(str[i++] & 0xff);
                   if (i == len)
                   {
                       Out += base64EncodeChars[c1 >> 2];
                       Out += base64EncodeChars[(c1 & 0x3) << 4];
                       Out += "==";
                       break;
                   }
                   c2 = str[i++];
                   if (i == len)
                   {
                       Out += base64EncodeChars[c1 >> 2];
                       Out += base64EncodeChars[((c1 & 0x3) << 4) | ((c2 & 0xF0) >> 4)];
                       Out += base64EncodeChars[(c2 & 0xF) << 2];
                       Out += "=";
                       break;
                   }
                   c3 = str[i++];
                   Out += base64EncodeChars[c1 >> 2];
                   Out += base64EncodeChars[((c1 & 0x3) << 4) | ((c2 & 0xF0) >> 4)];
                   Out += base64EncodeChars[((c2 & 0xF) << 2) | ((c3 & 0xC0) >> 6)];
                   Out += base64EncodeChars[c3 & 0x3F];
               }
               return Out;
           }
           string utf16to8(string str)
           {
               string Out = "";
               int i, len;
               char c;//char为16位Unicode字符,范围0~0xffff,感谢vczh提醒
               len = str.Length;
               for (i = 0; i < len; i++)
               {//根据字符的不同范围分别转化
                   c = str[i];
                   if ((c >= 0x0001) && (c <= 0x007F))
                   {
                       Out += str[i];
                   }
                   else if (c > 0x07FF)
                   {
                       Out += (char)(0xE0 | ((c >> 12) & 0x0F));
                       Out += (char)(0x80 | ((c >> 6) & 0x3F));
                       Out += (char)(0x80 | ((c >> 0) & 0x3F));
                   }
                   else
                   {
                       Out += (char)(0xC0 | ((c >> 6) & 0x1F));
                       Out += (char)(0x80 | ((c >> 0) & 0x3F));
                   }
               }
               return Out;
           }

           string base64decode(string str)
           {//解密
               int c1, c2, c3, c4;
               int i, len;
               string Out;
               len = str.Length;
               i = 0; Out = "";
               while (i < len)
               {
                   do
                   {
                       c1 = base64DecodeChars[str[i++] & 0xff];
                   } while (i < len && c1 == -1);
                   if (c1 == -1) break;
                   do
                   {
                       c2 = base64DecodeChars[str[i++] & 0xff];
                   } while (i < len && c2 == -1);
                   if (c2 == -1) break;
                   Out += (char)((c1 << 2) | ((c2 & 0x30) >> 4));
                   do
                   {
                       c3 = str[i++] & 0xff;
                       if (c3 == 61) return Out;
                       c3 = base64DecodeChars[c3];
                   } while (i < len && c3 == -1);
                   if (c3 == -1) break;
                   Out += (char)(((c2 & 0XF) << 4) | ((c3 & 0x3C) >> 2));
                   do
                   {
                       c4 = str[i++] & 0xff;
                       if (c4 == 61) return Out;
                       c4 = base64DecodeChars[c4];
                   } while (i < len && c4 == -1);
                   if (c4 == -1) break;
                   Out += (char)(((c3 & 0x03) << 6) | c4);
               }
               return Out;
           }

           string utf8to16(string str)
           {
               string Out = "";
               int i, len;
               char c, char2, char3;
               len = str.Length;
               i = 0; while (i < len)
               {
                   c = str[i++];
                   switch (c >> 4)
                   {
                       case 0:
                       case 1:
                       case 2:
                       case 3:
                       case 4:
                       case 5:
                       case 6:
                       case 7: Out += str[i - 1]; break;
                       case 12:
                       case 13: char2 = str[i++];
                       Out += (char)(((c & 0x1F) << 6) | (char2 & 0x3F)); break;
                       case 14: char2 = str[i++];
                       char3 = str[i++];
                       Out += (char)(((c & 0x0F) << 12) | ((char2 & 0x3F) << 6) | ((char3 & 0x3F) << 0)); break;
                   }
               }
               return Out;
           }

           private void button1_Click(object sender, EventArgs e)
           {
               textBox2.Text = base64encode(utf16to8(textBox1.Text));
           }

           private void button2_Click(object sender, EventArgs e)
           {
               textBox1.Text = utf8to16(base64decode(textBox2.Text));
           }

           private void button3_Click(object sender, EventArgs e)
           {
               textBox1.Clear();
               textBox2.Clear();
           }

           private void button4_Click(object sender, EventArgs e)
           {
               Application.Exit();
           }
       }
}

原文链接(转载请保留此行):http://hi.baidu.com/dream0xdl/blog/item/c8449135cfc6d01290ef3920.html
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