# Flash Crypto Pack v1.0

**URL:** <https://forum.kirupa.com/t/flash-crypto-pack-v1-0/32114>\
**Category:** flash\
**Created:** [October 1, 2003, 6:13pm UTC](https://forum.kirupa.com/t/flash-crypto-pack-v1-0/32114 "2003-10-01T18:13:39Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![Madokan](https://avatars.discourse-cdn.com/v4/letter/m/858c86/32.png) [@Madokan](https://forum.kirupa.com/u/Madokan)\
**Post date:** [October 1, 2003, 6:13pm UTC](https://forum.kirupa.com/t/flash-crypto-pack-v1-0/32114/1 "2003-10-01T18:13:39Z")

</div>

Hi Folks,

Just a few codelines to use MD4, MD5 or SHA-1 encryption in flash, too.

**MD5 - 128 bit**  
[AS]  
/\*

- MD5 Algorithm
- A Flash implementation of the RSA Data Security, Inc. MD5 Message
- Digest Algorithm, as defined in RFC 1321.
- Flash Version 1.0 - added and tested by Matthias Kannengiesser 2003.
- Original JavaScript Version 2.1 Copyright © Paul Johnston 1999 - 2002.
- Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet
- Distributed under the BSD License  
\*/

/\*

- Configurable variables  
\*/  
var hexcase = 0; // hex output format. 0 - lowercase; 1 - uppercase  
var b64pad = “”; // base-64 pad character. “=” for strict RFC compliance  
var chrsz = 8; // bits per input character. 8 - ASCII; 16 - Unicode

/\*

- Functions to encrypt  
\*/  
function hex\_md5(s){ return binl2hex(core\_md5(str2binl(s), s.length \* chrsz));}  
function b64\_md5(s){ return binl2b64(core\_md5(str2binl(s), s.length \* chrsz));}  
function str\_md5(s){ return binl2str(core\_md5(str2binl(s), s.length \* chrsz));}  
function hex\_hmac\_md5(key, data) { return binl2hex(core\_hmac\_md5(key, data)); }  
function b64\_hmac\_md5(key, data) { return binl2b64(core\_hmac\_md5(key, data)); }  
function str\_hmac\_md5(key, data) { return binl2str(core\_hmac\_md5(key, data)); }

// Usage  
/\*  
trace(hex\_md5(“matze”));  
trace(b64\_md5(“matze”));  
trace(str\_md5(“matze”));  
trace("------------------------");  
trace(hex\_hmac\_md5(“passwort”,“matze”));  
trace(b64\_hmac\_md5(“passwort”,“matze”));  
trace(str\_hmac\_md5(“passwort”,“matze”));  
\*/

function md5\_vm\_test()  
{  
return hex\_md5(“abc”) == “900150983cd24fb0d6963f7d28e17f72”;  
}

function core\_md5(x, len)  
{  
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);

}

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);  
}

function core\_hmac\_md5(key, data)  
{  
var bkey = str2binl(key);  
if(bkey.length \> 16) bkey = core\_md5(bkey, key.length \* chrsz);

var ipad = Array(16), opad = Array(16);  
for(var i = 0; i \< 16; i++)  
{  
ipad\* = bkey\* ^ 0x36363636;  
opad\* = bkey\* ^ 0x5C5C5C5C;  
}

var hash = core\_md5(ipad.concat(str2binl(data)), 512 + data.length \* chrsz);  
return core\_md5(opad.concat(hash), 512 + 128);  
}

function safe\_add(x, y)  
{  
var lsw = (x & 0xFFFF) + (y & 0xFFFF);  
var msw = (x \>\> 16) + (y \>\> 16) + (lsw \>\> 16);  
return (msw \<\< 16) | (lsw & 0xFFFF);  
}

function bit\_rol(num, cnt)  
{  
return (num \<\< cnt) | (num \>\>\> (32 - cnt));  
}

function str2binl(str)  
{  
var bin = Array();  
var mask = (1 \<\< chrsz) - 1;  
for(var i = 0; i \< str.length \* chrsz; i += chrsz)  
bin[i&gt;&gt;5] |= (str.charCodeAt(i / chrsz) & mask) \<\< (i%32);  
return bin;  
}

function binl2str(bin)  
{  
var str = “”;  
var mask = (1 \<\< chrsz) - 1;  
for(var i = 0; i \< bin.length \* 32; i += chrsz)  
str += String.fromCharCode((bin[i&gt;&gt;5] \>\>\> (i % 32)) & mask);  
return str;  
}

function binl2hex(binarray)  
{  
var hex\_tab = hexcase ? “0123456789ABCDEF” : “0123456789abcdef”;  
var str = “”;  
for(var i = 0; i \< binarray.length \* 4; i++)  
{  
str += hex\_tab.charAt((binarray[i&gt;&gt;2] \>\> ((i%4)\*8+4)) & 0xF) +  
hex\_tab.charAt((binarray[i&gt;&gt;2] \>\> ((i%4)\*8 )) & 0xF);  
}  
return str;  
}

function binl2b64(binarray)  
{  
var tab = “ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/”;  
var str = “”;  
for(var i = 0; i \< binarray.length \* 4; i += 3)  
{  
var triplet = (((binarray[i &gt;&gt; 2] \>\> 8 \* ( i %4)) & 0xFF) \<\< 16)  
| (((binarray[i+1 &gt;&gt; 2] \>\> 8 \* ((i+1)%4)) & 0xFF) \<\< 8 )  
| ((binarray[i+2 &gt;&gt; 2] \>\> 8 \* ((i+2)%4)) & 0xFF);  
for(var j = 0; j \< 4; j++)  
{  
if(i \* 8 + j \* 6 \> binarray.length \* 32) str += b64pad;  
else str += tab.charAt((triplet \>\> 6\*(3-j)) & 0x3F);  
}  
}  
return str;  
}  
[/AS]

Note:  
Make sure you know everything about bitwise-operators. 😉  
Original JavaScript version by Paul J.

yours  
Matze K.