PHP 加密 js 解密

PHP:

<?php
 
function strencode($string) {
    $string = base64_encode($string);
    $key = md5('just a test');
    $len = strlen($key);
    $code = '';
    for ($i = 0; $i < strlen($string); $i++) {
        $k = $i % $len;
        $code .= $string [$i] ^ $key [$k];
    }
    return base64_encode($code);
}
 
echo strencode('just a test');
?>

JS:

<script src="md5.js"></script>
<script src="base64.js"></script>
<script>
 
    function strencode(string) {
        key =md5('just a test');
        string = Base64.decode(string); 
        len = key.length;   
        code = '';   
        for (i = 0; i < string.length; i++) {   
            k = i % len;   
            code += String.fromCharCode(string.charCodeAt(i) ^ key.charCodeAt(k));   
        }   
        return Base64.decode(code);   
    }
    alert(strencode('U1s1TFN3IQ0reTZbBgJlCA===='));   
</script>

js MD5:

/*
 * A JavaScript implementation of the RSA Data Security, Inc. MD5 Message
 * Digest Algorithm, as defined in RFC 1321.
 * Version 2.2 Copyright (C) Paul Johnston 1999 - 2009
 * Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet
 * Distributed under the BSD License
 * See http://pajhome.org.uk/crypt/md5 for more info.
 */
 
/*
 * Configurable variables. You may need to tweak these to be compatible with
 * the server-side, but the defaults work in most cases.
 */
var hexcase = 0;   /* hex output format. 0 - lowercase; 1 - uppercase        */
var b64pad  = "";  /* base-64 pad character. "=" for strict RFC compliance   */
 
/*
 * These are the functions you'll usually want to call
 * They take string arguments and return either hex or base-64 encoded strings
 */
function md5(s)    {
    return rstr2hex(rstr_md5(str2rstr_utf8(s)));
}
function b64_md5(s)    {
    return rstr2b64(rstr_md5(str2rstr_utf8(s)));
}
function any_md5(s, e) {
    return rstr2any(rstr_md5(str2rstr_utf8(s)), e);
}
function hex_hmac_md5(k, d)
{
    return rstr2hex(rstr_hmac_md5(str2rstr_utf8(k), str2rstr_utf8(d)));
}
function b64_hmac_md5(k, d)
{
    return rstr2b64(rstr_hmac_md5(str2rstr_utf8(k), str2rstr_utf8(d)));
}
function any_hmac_md5(k, d, e)
{
    return rstr2any(rstr_hmac_md5(str2rstr_utf8(k), str2rstr_utf8(d)), e);
}
 
/*
 * Perform a simple self-test to see if the VM is working
 */
function md5_vm_test()
{
    return hex_md5("abc").toLowerCase() == "900150983cd24fb0d6963f7d28e17f72";
}
 
/*
 * Calculate the MD5 of a raw string
 */
function rstr_md5(s)
{
    return binl2rstr(binl_md5(rstr2binl(s), s.length * 8));
}
 
/*
 * Calculate the HMAC-MD5, of a key and some data (raw strings)
 */
function rstr_hmac_md5(key, data)
{
    var bkey = rstr2binl(key);
    if(bkey.length > 16) bkey = binl_md5(bkey, key.length * 8);
 
    var ipad = Array(16), opad = Array(16);
    for(var i = 0; i < 16; i++)
    {
        ipad[i] = bkey[i] ^ 0x36363636;
        opad[i] = bkey[i] ^ 0x5C5C5C5C;
    }
 
    var hash = binl_md5(ipad.concat(rstr2binl(data)), 512 + data.length * 8);
    return binl2rstr(binl_md5(opad.concat(hash), 512 + 128));
}
 
/*
 * Convert a raw string to a hex string
 */
function rstr2hex(input)
{
    try {
        hexcase
    } catch(e) {
        hexcase=0;
    }
    var hex_tab = hexcase ? "0123456789ABCDEF" : "0123456789abcdef";
    var output = "";
    var x;
    for(var i = 0; i < input.length; i++)
    {
        x = input.charCodeAt(i);
        output += hex_tab.charAt((x >>> 4) & 0x0F)
        +  hex_tab.charAt( x        & 0x0F);
    }
    return output;
}
 
/*
 * Convert a raw string to a base-64 string
 */
function rstr2b64(input)
{
    try {
        b64pad
    } catch(e) {
        b64pad='';
    }
    var tab = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
    var output = "";
    var len = input.length;
    for(var i = 0; i < len; i += 3)
    {
        var triplet = (input.charCodeAt(i) << 16)
        | (i + 1 < len ? input.charCodeAt(i+1) << 8 : 0)
        | (i + 2 < len ? input.charCodeAt(i+2)      : 0);
        for(var j = 0; j < 4; j++)
        {
            if(i * 8 + j * 6 > input.length * 8) output += b64pad;
            else output += tab.charAt((triplet >>> 6*(3-j)) & 0x3F);
        }
    }
    return output;
}
 
/*
 * Convert a raw string to an arbitrary string encoding
 */
function rstr2any(input, encoding)
{
    var divisor = encoding.length;
    var i, j, q, x, quotient;
 
    /* Convert to an array of 16-bit big-endian values, forming the dividend */
    var dividend = Array(Math.ceil(input.length / 2));
    for(i = 0; i < dividend.length; i++)
    {
        dividend[i] = (input.charCodeAt(i * 2) << 8) | input.charCodeAt(i * 2 + 1);
    }
 
    /*
   * Repeatedly perform a long division. The binary array forms the dividend,
   * the length of the encoding is the divisor. Once computed, the quotient
   * forms the dividend for the next step. All remainders are stored for later
   * use.
   */
    var full_length = Math.ceil(input.length * 8 /
        (Math.log(encoding.length) / Math.log(2)));
    var remainders = Array(full_length);
    for(j = 0; j < full_length; j++)
    {
        quotient = Array();
        x = 0;
        for(i = 0; i < dividend.length; i++)
        {
            x = (x << 16) + dividend[i];
            q = Math.floor(x / divisor);
            x -= q * divisor;
            if(quotient.length > 0 || q > 0)
                quotient[quotient.length] = q;
        }
        remainders[j] = x;
        dividend = quotient;
    }
 
    /* Convert the remainders to the output string */
    var output = "";
    for(i = remainders.length - 1; i >= 0; i--)
        output += encoding.charAt(remainders[i]);
 
    return output;
}
 
/*
 * Encode a string as utf-8.
 * For efficiency, this assumes the input is valid utf-16.
 */
function str2rstr_utf8(input)
{
    var output = "";
    var i = -1;
    var x, y;
 
    while(++i < input.length)
    {
        /* Decode utf-16 surrogate pairs */
        x = input.charCodeAt(i);
        y = i + 1 < input.length ? input.charCodeAt(i + 1) : 0;
        if(0xD800 <= x && x <= 0xDBFF && 0xDC00 <= y && y <= 0xDFFF)
        {
            x = 0x10000 + ((x & 0x03FF) << 10) + (y & 0x03FF);
            i++;
        }
 
        /* Encode output as utf-8 */
        if(x <= 0x7F)
            output += String.fromCharCode(x);
        else if(x <= 0x7FF)
            output += String.fromCharCode(0xC0 | ((x >>> 6 ) & 0x1F),
                0x80 | ( x         & 0x3F));
        else if(x <= 0xFFFF)
            output += String.fromCharCode(0xE0 | ((x >>> 12) & 0x0F),
                0x80 | ((x >>> 6 ) & 0x3F),
                0x80 | ( x         & 0x3F));
        else if(x <= 0x1FFFFF)
            output += String.fromCharCode(0xF0 | ((x >>> 18) & 0x07),
                0x80 | ((x >>> 12) & 0x3F),
                0x80 | ((x >>> 6 ) & 0x3F),
                0x80 | ( x         & 0x3F));
    }
    return output;
}
 
/*
 * Encode a string as utf-16
 */
function str2rstr_utf16le(input)
{
    var output = "";
    for(var i = 0; i < input.length; i++)
        output += String.fromCharCode( input.charCodeAt(i)        & 0xFF,
            (input.charCodeAt(i) >>> 8) & 0xFF);
    return output;
}
 
function str2rstr_utf16be(input)
{
    var output = "";
    for(var i = 0; i < input.length; i++)
        output += String.fromCharCode((input.charCodeAt(i) >>> 8) & 0xFF,
            input.charCodeAt(i)        & 0xFF);
    return output;
}
 
/*
 * Convert a raw string to an array of little-endian words
 * Characters >255 have their high-byte silently ignored.
 */
function rstr2binl(input)
{
    var output = Array(input.length >> 2);
    for(var i = 0; i < output.length; i++)
        output[i] = 0;
    for(var i = 0; i < input.length * 8; i += 8)
        output[i>>5] |= (input.charCodeAt(i / 8) & 0xFF) << (i%32);
    return output;
}
 
/*
 * Convert an array of little-endian words to a string
 */
function binl2rstr(input)
{
    var output = "";
    for(var i = 0; i < input.length * 32; i += 8)
        output += String.fromCharCode((input[i>>5] >>> (i % 32)) & 0xFF);
    return output;
}
 
/*
 * Calculate the MD5 of an array of little-endian words, and a bit length.
 */
function binl_md5(x, len)
{
    /* append padding */
    x[len >> 5] |= 0x80 << ((len) % 32);
    x[(((len + 64) >>> 9) << 4) + 14] = len;
 
    var a =  1732584193;
    var b = -271733879;
    var c = -1732584194;
    var d =  271733878;
 
    for(var i = 0; i < x.length; i += 16)
    {
        var olda = a;
        var oldb = b;
        var oldc = c;
        var oldd = d;
 
        a = md5_ff(a, b, c, d, x[i+ 0], 7 , -680876936);
        d = md5_ff(d, a, b, c, x[i+ 1], 12, -389564586);
        c = md5_ff(c, d, a, b, x[i+ 2], 17,  606105819);
        b = md5_ff(b, c, d, a, x[i+ 3], 22, -1044525330);
        a = md5_ff(a, b, c, d, x[i+ 4], 7 , -176418897);
        d = md5_ff(d, a, b, c, x[i+ 5], 12,  1200080426);
        c = md5_ff(c, d, a, b, x[i+ 6], 17, -1473231341);
        b = md5_ff(b, c, d, a, x[i+ 7], 22, -45705983);
        a = md5_ff(a, b, c, d, x[i+ 8], 7 ,  1770035416);
        d = md5_ff(d, a, b, c, x[i+ 9], 12, -1958414417);
        c = md5_ff(c, d, a, b, x[i+10], 17, -42063);
        b = md5_ff(b, c, d, a, x[i+11], 22, -1990404162);
        a = md5_ff(a, b, c, d, x[i+12], 7 ,  1804603682);
        d = md5_ff(d, a, b, c, x[i+13], 12, -40341101);
        c = md5_ff(c, d, a, b, x[i+14], 17, -1502002290);
        b = md5_ff(b, c, d, a, x[i+15], 22,  1236535329);
 
        a = md5_gg(a, b, c, d, x[i+ 1], 5 , -165796510);
        d = md5_gg(d, a, b, c, x[i+ 6], 9 , -1069501632);
        c = md5_gg(c, d, a, b, x[i+11], 14,  643717713);
        b = md5_gg(b, c, d, a, x[i+ 0], 20, -373897302);
        a = md5_gg(a, b, c, d, x[i+ 5], 5 , -701558691);
        d = md5_gg(d, a, b, c, x[i+10], 9 ,  38016083);
        c = md5_gg(c, d, a, b, x[i+15], 14, -660478335);
        b = md5_gg(b, c, d, a, x[i+ 4], 20, -405537848);
        a = md5_gg(a, b, c, d, x[i+ 9], 5 ,  568446438);
        d = md5_gg(d, a, b, c, x[i+14], 9 , -1019803690);
        c = md5_gg(c, d, a, b, x[i+ 3], 14, -187363961);
        b = md5_gg(b, c, d, a, x[i+ 8], 20,  1163531501);
        a = md5_gg(a, b, c, d, x[i+13], 5 , -1444681467);
        d = md5_gg(d, a, b, c, x[i+ 2], 9 , -51403784);
        c = md5_gg(c, d, a, b, x[i+ 7], 14,  1735328473);
        b = md5_gg(b, c, d, a, x[i+12], 20, -1926607734);
 
        a = md5_hh(a, b, c, d, x[i+ 5], 4 , -378558);
        d = md5_hh(d, a, b, c, x[i+ 8], 11, -2022574463);
        c = md5_hh(c, d, a, b, x[i+11], 16,  1839030562);
        b = md5_hh(b, c, d, a, x[i+14], 23, -35309556);
        a = md5_hh(a, b, c, d, x[i+ 1], 4 , -1530992060);
        d = md5_hh(d, a, b, c, x[i+ 4], 11,  1272893353);
        c = md5_hh(c, d, a, b, x[i+ 7], 16, -155497632);
        b = md5_hh(b, c, d, a, x[i+10], 23, -1094730640);
        a = md5_hh(a, b, c, d, x[i+13], 4 ,  681279174);
        d = md5_hh(d, a, b, c, x[i+ 0], 11, -358537222);
        c = md5_hh(c, d, a, b, x[i+ 3], 16, -722521979);
        b = md5_hh(b, c, d, a, x[i+ 6], 23,  76029189);
        a = md5_hh(a, b, c, d, x[i+ 9], 4 , -640364487);
        d = md5_hh(d, a, b, c, x[i+12], 11, -421815835);
        c = md5_hh(c, d, a, b, x[i+15], 16,  530742520);
        b = md5_hh(b, c, d, a, x[i+ 2], 23, -995338651);
 
        a = md5_ii(a, b, c, d, x[i+ 0], 6 , -198630844);
        d = md5_ii(d, a, b, c, x[i+ 7], 10,  1126891415);
        c = md5_ii(c, d, a, b, x[i+14], 15, -1416354905);
        b = md5_ii(b, c, d, a, x[i+ 5], 21, -57434055);
        a = md5_ii(a, b, c, d, x[i+12], 6 ,  1700485571);
        d = md5_ii(d, a, b, c, x[i+ 3], 10, -1894986606);
        c = md5_ii(c, d, a, b, x[i+10], 15, -1051523);
        b = md5_ii(b, c, d, a, x[i+ 1], 21, -2054922799);
        a = md5_ii(a, b, c, d, x[i+ 8], 6 ,  1873313359);
        d = md5_ii(d, a, b, c, x[i+15], 10, -30611744);
        c = md5_ii(c, d, a, b, x[i+ 6], 15, -1560198380);
        b = md5_ii(b, c, d, a, x[i+13], 21,  1309151649);
        a = md5_ii(a, b, c, d, x[i+ 4], 6 , -145523070);
        d = md5_ii(d, a, b, c, x[i+11], 10, -1120210379);
        c = md5_ii(c, d, a, b, x[i+ 2], 15,  718787259);
        b = md5_ii(b, c, d, a, x[i+ 9], 21, -343485551);
 
        a = safe_add(a, olda);
        b = safe_add(b, oldb);
        c = safe_add(c, oldc);
        d = safe_add(d, oldd);
    }
    return Array(a, b, c, d);
}
 
/*
 * These functions implement the four basic operations the algorithm uses.
 */
function md5_cmn(q, a, b, x, s, t)
{
    return safe_add(bit_rol(safe_add(safe_add(a, q), safe_add(x, t)), s),b);
}
function md5_ff(a, b, c, d, x, s, t)
{
    return md5_cmn((b & c) | ((~b) & d), a, b, x, s, t);
}
function md5_gg(a, b, c, d, x, s, t)
{
    return md5_cmn((b & d) | (c & (~d)), a, b, x, s, t);
}
function md5_hh(a, b, c, d, x, s, t)
{
    return md5_cmn(b ^ c ^ d, a, b, x, s, t);
}
function md5_ii(a, b, c, d, x, s, t)
{
    return md5_cmn(c ^ (b | (~d)), a, b, x, s, t);
}
 
/*
 * Add integers, wrapping at 2^32. This uses 16-bit operations internally
 * to work around bugs in some JS interpreters.
 */
function safe_add(x, y)
{
    var lsw = (x & 0xFFFF) + (y & 0xFFFF);
    var msw = (x >> 16) + (y >> 16) + (lsw >> 16);
    return (msw << 16) | (lsw & 0xFFFF);
}
 
/*
 * Bitwise rotate a 32-bit number to the left.
 */
function bit_rol(num, cnt)
{
    return (num << cnt) | (num >>> (32 - cnt));
}

js base64:

/*
 * $Id: base64.js,v 2.12 2013/05/06 07:54:20 dankogai Exp dankogai $
 *
 *  Licensed under the MIT license.
 *    http://opensource.org/licenses/mit-license
 *
 *  References:
 *    http://en.wikipedia.org/wiki/Base64
 */
 
(function(global) {
    'use strict';
    // existing version for noConflict()
    var _Base64 = global.Base64;
    var version = "2.1.4";
    // if node.js, we use Buffer
    var buffer;
    if (typeof module !== 'undefined' && module.exports) {
        buffer = require('buffer').Buffer;
    }
    // constants
    var b64chars
    = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
    var b64tab = function(bin) {
        var t = {};
        for (var i = 0, l = bin.length; i < l; i++) t[bin.charAt(i)] = i;
        return t;
    }(b64chars);
    var fromCharCode = String.fromCharCode;
    // encoder stuff
    var cb_utob = function(c) {
        if (c.length < 2) {
            var cc = c.charCodeAt(0);
            return cc < 0x80 ? c
            : cc < 0x800 ? (fromCharCode(0xc0 | (cc >>> 6))
                + fromCharCode(0x80 | (cc & 0x3f)))
            : (fromCharCode(0xe0 | ((cc >>> 12) & 0x0f))
                + fromCharCode(0x80 | ((cc >>>  6) & 0x3f))
                + fromCharCode(0x80 | ( cc         & 0x3f)));
        } else {
            var cc = 0x10000
            + (c.charCodeAt(0) - 0xD800) * 0x400
            + (c.charCodeAt(1) - 0xDC00);
            return (fromCharCode(0xf0 | ((cc >>> 18) & 0x07))
                + fromCharCode(0x80 | ((cc >>> 12) & 0x3f))
                + fromCharCode(0x80 | ((cc >>>  6) & 0x3f))
                + fromCharCode(0x80 | ( cc         & 0x3f)));
        }
    };
    var re_utob = /[\uD800-\uDBFF][\uDC00-\uDFFFF]|[^\x00-\x7F]/g;
    var utob = function(u) {
        return u.replace(re_utob, cb_utob);
    };
    var cb_encode = function(ccc) {
        var padlen = [0, 2, 1][ccc.length % 3],
        ord = ccc.charCodeAt(0) << 16
        | ((ccc.length > 1 ? ccc.charCodeAt(1) : 0) << 8)
        | ((ccc.length > 2 ? ccc.charCodeAt(2) : 0)),
        chars = [
        b64chars.charAt( ord >>> 18),
        b64chars.charAt((ord >>> 12) & 63),
        padlen >= 2 ? '=' : b64chars.charAt((ord >>> 6) & 63),
        padlen >= 1 ? '=' : b64chars.charAt(ord & 63)
        ];
        return chars.join('');
    };
    var btoa = global.btoa ? function(b) {
        return global.btoa(b);
    } : function(b) {
        return b.replace(/[\s\S]{1,3}/g, cb_encode);
    };
    var _encode = buffer
    ? function (u) {
        return (new buffer(u)).toString('base64')
    } 
    : function (u) {
        return btoa(utob(u))
    }
    ;
    var encode = function(u, urisafe) {
        return !urisafe 
        ? _encode(u)
        : _encode(u).replace(/[+\/]/g, function(m0) {
            return m0 == '+' ? '-' : '_';
        }).replace(/=/g, '');
    };
    var encodeURI = function(u) {
        return encode(u, true)
    };
    // decoder stuff
    var re_btou = new RegExp([
        '[\xC0-\xDF][\x80-\xBF]',
        '[\xE0-\xEF][\x80-\xBF]{2}',
        '[\xF0-\xF7][\x80-\xBF]{3}'
        ].join('|'), 'g');
    var cb_btou = function(cccc) {
        switch(cccc.length) {
            case 4:
                var cp = ((0x07 & cccc.charCodeAt(0)) << 18)
                |    ((0x3f & cccc.charCodeAt(1)) << 12)
                |    ((0x3f & cccc.charCodeAt(2)) <<  6)
                |     (0x3f & cccc.charCodeAt(3)),
                offset = cp - 0x10000;
                return (fromCharCode((offset  >>> 10) + 0xD800)
                    + fromCharCode((offset & 0x3FF) + 0xDC00));
            case 3:
                return fromCharCode(
                    ((0x0f & cccc.charCodeAt(0)) << 12)
                    | ((0x3f & cccc.charCodeAt(1)) << 6)
                    |  (0x3f & cccc.charCodeAt(2))
                    );
            default:
                return  fromCharCode(
                    ((0x1f & cccc.charCodeAt(0)) << 6)
                    |  (0x3f & cccc.charCodeAt(1))
                    );
        }
    };
    var btou = function(b) {
        return b.replace(re_btou, cb_btou);
    };
    var cb_decode = function(cccc) {
        var len = cccc.length,
        padlen = len % 4,
        n = (len > 0 ? b64tab[cccc.charAt(0)] << 18 : 0)
        | (len > 1 ? b64tab[cccc.charAt(1)] << 12 : 0)
        | (len > 2 ? b64tab[cccc.charAt(2)] <<  6 : 0)
        | (len > 3 ? b64tab[cccc.charAt(3)]       : 0),
        chars = [
        fromCharCode( n >>> 16),
        fromCharCode((n >>>  8) & 0xff),
        fromCharCode( n         & 0xff)
        ];
        chars.length -= [0, 0, 2, 1][padlen];
        return chars.join('');
    };
    var atob = global.atob ? function(a) {
        return global.atob(a);
    } : function(a){
        return a.replace(/[\s\S]{1,4}/g, cb_decode);
    };
    var _decode = buffer
    ? function(a) {
        return (new buffer(a, 'base64')).toString()
    }
    : function(a) {
        return btou(atob(a))
    };
    var decode = function(a){
        return _decode(
            a.replace(/[-_]/g, function(m0) {
                return m0 == '-' ? '+' : '/'
            })
            .replace(/[^A-Za-z0-9\+\/]/g, '')
            );
    };
    var noConflict = function() {
        var Base64 = global.Base64;
        global.Base64 = _Base64;
        return Base64;
    };
    // export Base64
    global.Base64 = {
        VERSION: version,
        atob: atob,
        btoa: btoa,
        fromBase64: decode,
        toBase64: encode,
        utob: utob,
        encode: encode,
        encodeURI: encodeURI,
        btou: btou,
        decode: decode,
        noConflict: noConflict
    };
    // if ES5 is available, make Base64.extendString() available
    if (typeof Object.defineProperty === 'function') {
        var noEnum = function(v){
            return {
                value:v,
                enumerable:false,
                writable:true,
                configurable:true
            };
        };
        global.Base64.extendString = function () {
            Object.defineProperty(
                String.prototype, 'fromBase64', noEnum(function () {
                    return decode(this)
                }));
            Object.defineProperty(
                String.prototype, 'toBase64', noEnum(function (urisafe) {
                    return encode(this, urisafe)
                }));
            Object.defineProperty(
                String.prototype, 'toBase64URI', noEnum(function () {
                    return encode(this, true)
                }));
        };
    }
// that's it!
})(this);

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