Une fonction qui calcule le md5 d'une chaîne de caractères avec en option le résultat en majuscule et le format de la chaîne (ansi ou unicode).
Source / Exemple :
/**
- Message Digest 5 hash code function
-
- @author Dri
- @version 1.0
-
- @param String message
- @param bool upper_case
- @param bool unicode
- /
function md5(message, upper_case, unicode) {
//misc functions
var add = function(x, y) {
var lsw = (x & 0xFFFF) + (y & 0xFFFF);
var msw = (x >>> 16) + (y >>> 16) + (lsw >>> 16);
return (msw << 16) | (lsw & 0xFFFF);
}
var rol = function(x, y){
return (x << y) | (x >>> (32 - y));
}
var hex = function(abcd) {
var hex_string = "";
var hex_buffer = "0123456789abcdef";
if(upper_case) hex_buffer = hex_buffer.toUpperCase();
for(var i = 0; i < abcd.length; i++) for(var j = 0; j < 32; j += 8)
hex_string += hex_buffer.charAt( (abcd[i] >> (j+4)) & 0xF) + hex_buffer.charAt( (abcd[i] >> j) & 0xF);
return hex_string;
}
//md5 functions
var xx = function(q, a, b, x, s, ac) {
return add(rol(add(add(a, q), add(x, ac)), s),b);
}
var ff = function(a, b, c, d, x, s, ac) {
return xx((b & c) | ((~b) & d), a, b, x, s, ac);
}
var gg = function(a, b, c, d, x, s, ac) {
return xx((b & d) | (c & (~d)), a, b, x, s, ac);
}
var hh = function(a, b, c, d, x, s, ac) {
return xx(b ^ c ^ d, a, b, x, s, ac);
}
var ii = function(a, b, c, d, x, s, ac) {
return xx(c ^ (b | (~d)), a, b, x, s, ac);
}
//message digest buffer
message = message.toString();
var i;
var buffer = [];
var char_size = unicode ? 16 : 8;
var char_mask = (1 << char_size) - 1;
for(i = 0; i < message.length * char_size; i += char_size)
buffer[i >> 5] |= (message.charCodeAt(i / char_size) & char_mask) << (i & 0x1F);
//message digest padding
buffer[i >> 5] |= 0x80 << (i & 0x1F);
buffer[(((i + 64) >>> 5) & ~0xF) + 14] = i;
//message digest loop
var a = 0x67452301;
var b = 0xEFCDAB89;
var c = 0x98BADCFE;
var d = 0x10325476;
for(i = 0; i < buffer.length; i += 16) {
var temp_a = a;
var temp_b = b;
var temp_c = c;
var temp_d = d;
a = ff(a, b, c, d, buffer[i+ 0], 7, 0xD76AA478);
d = ff(d, a, b, c, buffer[i+ 1], 12, 0xE8C7B756);
c = ff(c, d, a, b, buffer[i+ 2], 17, 0x242070DB);
b = ff(b, c, d, a, buffer[i+ 3], 22, 0xC1BDCEEE);
a = ff(a, b, c, d, buffer[i+ 4], 7, 0xF57C0FAF);
d = ff(d, a, b, c, buffer[i+ 5], 12, 0x4787C62A);
c = ff(c, d, a, b, buffer[i+ 6], 17, 0xA8304613);
b = ff(b, c, d, a, buffer[i+ 7], 22, 0xFD469501);
a = ff(a, b, c, d, buffer[i+ 8], 7, 0x698098D8);
d = ff(d, a, b, c, buffer[i+ 9], 12, 0x8B44F7AF);
c = ff(c, d, a, b, buffer[i+10], 17, 0xFFFF5BB1);
b = ff(b, c, d, a, buffer[i+11], 22, 0x895CD7BE);
a = ff(a, b, c, d, buffer[i+12], 7, 0x6B901122);
d = ff(d, a, b, c, buffer[i+13], 12, 0xFD987193);
c = ff(c, d, a, b, buffer[i+14], 17, 0xA679438E);
b = ff(b, c, d, a, buffer[i+15], 22, 0x49B40821);
a = gg(a, b, c, d, buffer[i+ 1], 5, 0xF61E2562);
d = gg(d, a, b, c, buffer[i+ 6], 9, 0xC040B340);
c = gg(c, d, a, b, buffer[i+11], 14, 0x265E5A51);
b = gg(b, c, d, a, buffer[i+ 0], 20, 0xE9B6C7AA);
a = gg(a, b, c, d, buffer[i+ 5], 5, 0xD62F105D);
d = gg(d, a, b, c, buffer[i+10], 9, 0x02441453);
c = gg(c, d, a, b, buffer[i+15], 14, 0xD8A1E681);
b = gg(b, c, d, a, buffer[i+ 4], 20, 0xE7D3FBC8);
a = gg(a, b, c, d, buffer[i+ 9], 5, 0x21E1CDE6);
d = gg(d, a, b, c, buffer[i+14], 9, 0xC33707D6);
c = gg(c, d, a, b, buffer[i+ 3], 14, 0xF4D50D87);
b = gg(b, c, d, a, buffer[i+ 8], 20, 0x455A14ED);
a = gg(a, b, c, d, buffer[i+13], 5, 0xA9E3E905);
d = gg(d, a, b, c, buffer[i+ 2], 9, 0xFCEFA3F8);
c = gg(c, d, a, b, buffer[i+ 7], 14, 0x676F02D9);
b = gg(b, c, d, a, buffer[i+12], 20, 0x8D2A4C8A);
a = hh(a, b, c, d, buffer[i+ 5], 4, 0xFFFA3942);
d = hh(d, a, b, c, buffer[i+ 8], 11, 0x8771F681);
c = hh(c, d, a, b, buffer[i+11], 16, 0x6D9D6122);
b = hh(b, c, d, a, buffer[i+14], 23, 0xFDE5380C);
a = hh(a, b, c, d, buffer[i+ 1], 4, 0xA4BEEA44);
d = hh(d, a, b, c, buffer[i+ 4], 11, 0x4BDECFA9);
c = hh(c, d, a, b, buffer[i+ 7], 16, 0xF6BB4B60);
b = hh(b, c, d, a, buffer[i+10], 23, 0xBEBFBC70);
a = hh(a, b, c, d, buffer[i+13], 4, 0x289B7EC6);
d = hh(d, a, b, c, buffer[i+ 0], 11, 0xEAA127FA);
c = hh(c, d, a, b, buffer[i+ 3], 16, 0xD4EF3085);
b = hh(b, c, d, a, buffer[i+ 6], 23, 0x04881D05);
a = hh(a, b, c, d, buffer[i+ 9], 4, 0xD9D4D039);
d = hh(d, a, b, c, buffer[i+12], 11, 0xE6DB99E5);
c = hh(c, d, a, b, buffer[i+15], 16, 0x1FA27CF8);
b = hh(b, c, d, a, buffer[i+ 2], 23, 0xC4AC5665);
a = ii(a, b, c, d, buffer[i+ 0], 6, 0xF4292244);
d = ii(d, a, b, c, buffer[i+ 7], 10, 0x432AFF97);
c = ii(c, d, a, b, buffer[i+14], 15, 0xAB9423A7);
b = ii(b, c, d, a, buffer[i+ 5], 21, 0xFC93A039);
a = ii(a, b, c, d, buffer[i+12], 6, 0x655B59C3);
d = ii(d, a, b, c, buffer[i+ 3], 10, 0x8F0CCC92);
c = ii(c, d, a, b, buffer[i+10], 15, 0xFFEFF47D);
b = ii(b, c, d, a, buffer[i+ 1], 21, 0x85845DD1);
a = ii(a, b, c, d, buffer[i+ 8], 6, 0x6FA87E4F);
d = ii(d, a, b, c, buffer[i+15], 10, 0xFE2CE6E0);
c = ii(c, d, a, b, buffer[i+ 6], 15, 0xA3014314);
b = ii(b, c, d, a, buffer[i+13], 21, 0x4E0811A1);
a = ii(a, b, c, d, buffer[i+ 4], 6, 0xF7537E82);
d = ii(d, a, b, c, buffer[i+11], 10, 0xBD3AF235);
c = ii(c, d, a, b, buffer[i+ 2], 15, 0x2AD7D2BB);
b = ii(b, c, d, a, buffer[i+ 9], 21, 0xEB86D391);
a = add(a, temp_a);
b = add(b, temp_b);
c = add(c, temp_c);
d = add(d, temp_d);
}
return hex( [a, b, c, d] );
}
Conclusion :
Testé uniquement sous windows 98 et XP avec IE6, Mozilla, FireFox et Opera 9.
Pour utiliser la fonction voila quelques exemples :
alert( md5("md5") );
alert( md5("md5", true) );
la même chose en unicode
alert( md5("md5", false, true) );
alert( md5("md5", true, true) );
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