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C# base64加密解密完整代码(支持中文,全角符号)

2008-03-07 11:22 896 查看

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

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

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();
}
}
}

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