PHP加密由javascript解密的例子

 PHP加密函數

 代碼如下   <?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:解密

 代碼如下   <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：

 

 代碼如下   /*
 * 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 str