2011年12月

javascript版base64编码和解码

[code language="javascript"]

var base64EncodeChars="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";var base64DecodeChars=new Array(-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);

function base64_encode(str){var utf16to8=function(s){var out,i,len,c;out="";len=s.length;for(i=0;i<len;i++){c=s.charCodeAt(i);if((c>=0x0001)&&(c<=0x007F)){out+=s.charAt(i)}else if(c>0x07FF){out+=String.fromCharCode(0xE0|((c>>12)&0x0F));out+=String.fromCharCode(0x80|((c>>6)&0x3F));out+=String.fromCharCode(0x80|((c>>0)&0x3F))}else{out+=String.fromCharCode(0xC0|((c>>6)&0x1F));out+=String.fromCharCode(0x80|((c>>0)&0x3F))}}return out};str=utf16to8(str);var out,i,len;var c1,c2,c3;len=str.length;i=0;out="";while(i<len){c1=str.charCodeAt(i++)&0xff;if(i==len){out+=base64EncodeChars.charAt(c1>>2);out+=base64EncodeChars.charAt((c1&0x3)<<4);out+="==";break}c2=str.charCodeAt(i++);if(i==len){out+=base64EncodeChars.charAt(c1>>2);out+=base64EncodeChars.charAt(((c1&0x3)<<4)|((c2&0xF0)>>4));out+=base64EncodeChars.charAt((c2&0xF)<<2);out+="=";break}c3=str.charCodeAt(i++);out+=base64EncodeChars.charAt(c1>>2);out+=base64EncodeChars.charAt(((c1&0x3)<<4)|((c2&0xF0)>>4));out+=base64EncodeChars.charAt(((c2&0xF)<<2)|((c3&0xC0)>>6));out+=base64EncodeChars.charAt(c3&0x3F)}return out}

function base64_decode(str){var c1,c2,c3,c4;var i,len,out;len=str.length;i=0;out="";while(i<len){do{c1=base64DecodeChars[str.charCodeAt(i++)&0xff]}while(i<len&&c1==-1);if(c1==-1)break;do{c2=base64DecodeChars[str.charCodeAt(i++)&0xff]}while(i<len&&c2==-1);if(c2==-1)break;out+=String.fromCharCode((c1<<2)|((c2&0x30)>>4));do{c3=str.charCodeAt(i++)&0xff;if(c3==61)return out;c3=base64DecodeChars[c3]}while(i<len&&c3==-1);if(c3==-1)break;out+=String.fromCharCode(((c2&0XF)<<4)|((c3&0x3C)>>2));do{c4=str.charCodeAt(i++)&0xff;if(c4==61)return out;c4=base64DecodeChars[c4]}while(i<len&&c4==-1);if(c4==-1)break;out+=String.fromCharCode(((c3&0x03)<<6)|c4)}var utf8to16=function(s){var out,i,len,c;var char2,char3;out="";len=s.length;i=0;while(i<len){c=s.charCodeAt(i++);switch(c>>4){case 0:case 1:case 2:case 3:case 4:case 5:case 6:case 7:out+=s.charAt(i-1);break;case 12:case 13:char2=s.charCodeAt(i++);out+=String.fromCharCode(((c&0x1F)<<6)|(char2&0x3F));break;case 14:char2=s.charCodeAt(i++);char3=s.charCodeAt(i++);out+=String.fromCharCode(((c&0x0F)<<12)|((char2&0x3F)<<6)|((char3&0x3F)<<0));break}}return out};return utf8to16(out)}

[/code]

PHP字符串加密解密函数

[code language="php"]
function encrypt( $string, $operation = 'DECODE', $key = '', $expiry = 3600 ){

$ckey_length = 4;
// 随机密钥长度 取值 0-32;
// 加入随机密钥,可以令密文无任何规律,即便是原文和密钥完全相同,加密结果也会每次不同,增大破解难度。
// 取值越大,密文变动规律越大,密文变化 = 16 的 $ckey_length 次方
// 当此值为 0 时,则不产生随机密钥
$key = md5( $key ? $key : 'default_key' ); //这里可以填写默认key值
$keya = md5( substr( $key, 0, 16 ) );
$keyb = md5( substr( $key, 16, 16 ) );
$keyc = $ckey_length ? ( $operation == 'DECODE' ? substr( $string, 0, $ckey_length ): substr( md5( microtime() ), - $ckey_length ) ) : '';

$cryptkey = $keya . md5( $keya . $keyc );
$key_length = strlen( $cryptkey );

$string = $operation == 'DECODE' ? base64_decode( substr( $string, $ckey_length ) ) : sprintf( '%010d', $expiry ? $expiry + time() : 0 ) . substr( md5( $string . $keyb ), 0, 16 ) . $string;
$string_length = strlen( $string );

$result = '';
$box = range( 0, 255 );

$rndkey = array();
for( $i = 0; $i <= 255; $i++ ){
$rndkey[$i] = ord( $cryptkey[$i % $key_length] );
}

for( $j = $i = 0; $i < 256; $i++ ){
$j = ( $j + $box[$i] + $rndkey[$i] ) % 256;
$tmp = $box[$i];
$box[$i] = $box[$j];
$box[$j] = $tmp;
}

for( $a = $j = $i = 0; $i < $string_length; $i++ ){
$a = ( $a + 1 ) % 256;
$j = ( $j + $box[$a] ) % 256;
$tmp = $box[$a];
$box[$a] = $box[$j];
$box[$j] = $tmp;
$result .= chr( ord( $string[$i] ) ^ ( $box[( $box[$a] + $box[$j] ) % 256] ) );
}

if( $operation == 'DECODE' ){
if( ( substr( $result, 0, 10 ) == 0 || substr( $result, 0, 10 ) - time() > 0 ) && substr( $result, 10, 16 ) == substr( md5( substr( $result, 26 ) . $keyb ), 0, 16 ) ){
return substr( $result, 26 );
}else{
return '';
}
}else{
return $keyc . str_replace( '=', '', base64_encode( $result ) );
}
}
[/code]