MD5 encryption method in JS

 1 
/* 2 * A JavaScript implementation of the RSA Data Security, Inc. MD5 Message 3 * Digest Algorithm, as defined in RFC 1321. 4 * Version 2.1 Copyright (C) Paul Johnston 1999 - 2002. 5 * Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet 6 * Distributed under the BSD License 7 * See http://pajhome.org.uk/crypt/md5 for more info. 8*/
     9 10 
/* 11 * Configurable variables. You may need to tweak these to be compatible with 12 * the server-side, but the defaults work in most cases. 13*/
    14 var hexcase = 0;
    /* hex output format. 0 - lowercase;
    1 - uppercase*/
    15 var b64pad = "";
    /* base-64 pad character. "=" for strict RFC compliance*/
    16 var chrsz = 8;
    /* bits per input character. 8 - ASCII;
    16 - Unicode*/
    17 18 
/* 19 * These are the functions you'll usually want to call 20 * They take string arguments and return either hex or base-64 encoded strings 21*/
    22 function hex_md5(s) {
    return binl2hex(core_md5(str2binl(s), s.length * chrsz));
}
23 function b64_md5(s) {
    return binl2b64(core_md5(str2binl(s), s.length * chrsz));
}
24 function str_md5(s) {
    return binl2str(core_md5(str2binl(s), s.length * chrsz));
}
25 function hex_hmac_md5(key, data) {
    return binl2hex(core_hmac_md5(key, data));
}
26 function b64_hmac_md5(key, data) {
    return binl2b64(core_hmac_md5(key, data));
}
27 function str_hmac_md5(key, data) {
    return binl2str(core_hmac_md5(key, data));
}
28 29 
/* 30 * Perform a simple self-test to see if the VM is working 31*/
    32 function md5_vm_test() 33 {
    34 return hex_md5("abc") == "900150983cd24fb0d6963f7d28e17f72";
    35 }
36 37 
/* 38 * Calculate the MD5 of an array of little-endian words, and a bit length 39*/
    40 function core_md5(x, len) 41 {
    42 
/* append padding*/
    43 x[len >> 5] |= 0x80 << ((len) % 32);
    44 x[(((len + 64) >>> 9) << 4) + 14] = len;
    45 46 var a = 1732584193;
    47 var b = -271733879;
    48 var c = -1732584194;
    49 var d = 271733878;
    50 51 for(var i = 0;
    i < x.length;
    i += 16) 52 {
    53 var olda = a;
    54 var oldb = b;
    55 var oldc = c;
    56 var oldd = d;
    57 58 a = md5_ff(a, b, c, d, x[i+ 0], 7 , -680876936);
    59 d = md5_ff(d, a, b, c, x[i+ 1], 12, -389564586);
    60 c = md5_ff(c, d, a, b, x[i+ 2], 17, 606105819);
    61 b = md5_ff(b, c, d, a, x[i+ 3], 22, -1044525330);
    62 a = md5_ff(a, b, c, d, x[i+ 4], 7 , -176418897);
    63 d = md5_ff(d, a, b, c, x[i+ 5], 12, 1200080426);
    64 c = md5_ff(c, d, a, b, x[i+ 6], 17, -1473231341);
    65 b = md5_ff(b, c, d, a, x[i+ 7], 22, -45705983);
    66 a = md5_ff(a, b, c, d, x[i+ 8], 7 , 1770035416);
    67 d = md5_ff(d, a, b, c, x[i+ 9], 12, -1958414417);
    68 c = md5_ff(c, d, a, b, x[i+10], 17, -42063);
    69 b = md5_ff(b, c, d, a, x[i+11], 22, -1990404162);
    70 a = md5_ff(a, b, c, d, x[i+12], 7 , 1804603682);
    71 d = md5_ff(d, a, b, c, x[i+13], 12, -40341101);
    72 c = md5_ff(c, d, a, b, x[i+14], 17, -1502002290);
    73 b = md5_ff(b, c, d, a, x[i+15], 22, 1236535329);
    74 75 a = md5_gg(a, b, c, d, x[i+ 1], 5 , -165796510);
    76 d = md5_gg(d, a, b, c, x[i+ 6], 9 , -1069501632);
    77 c = md5_gg(c, d, a, b, x[i+11], 14, 643717713);
    78 b = md5_gg(b, c, d, a, x[i+ 0], 20, -373897302);
    79 a = md5_gg(a, b, c, d, x[i+ 5], 5 , -701558691);
    80 d = md5_gg(d, a, b, c, x[i+10], 9 , 38016083);
    81 c = md5_gg(c, d, a, b, x[i+15], 14, -660478335);
    82 b = md5_gg(b, c, d, a, x[i+ 4], 20, -405537848);
    83 a = md5_gg(a, b, c, d, x[i+ 9], 5 , 568446438);
    84 d = md5_gg(d, a, b, c, x[i+14], 9 , -1019803690);
    85 c = md5_gg(c, d, a, b, x[i+ 3], 14, -187363961);
    86 b = md5_gg(b, c, d, a, x[i+ 8], 20, 1163531501);
    87 a = md5_gg(a, b, c, d, x[i+13], 5 , -1444681467);
    88 d = md5_gg(d, a, b, c, x[i+ 2], 9 , -51403784);
    89 c = md5_gg(c, d, a, b, x[i+ 7], 14, 1735328473);
    90 b = md5_gg(b, c, d, a, x[i+12], 20, -1926607734);
    91 92 a = md5_hh(a, b, c, d, x[i+ 5], 4 , -378558);
    93 d = md5_hh(d, a, b, c, x[i+ 8], 11, -2022574463);
    94 c = md5_hh(c, d, a, b, x[i+11], 16, 1839030562);
    95 b = md5_hh(b, c, d, a, x[i+14], 23, -35309556);
    96 a = md5_hh(a, b, c, d, x[i+ 1], 4 , -1530992060);
    97 d = md5_hh(d, a, b, c, x[i+ 4], 11, 1272893353);
    98 c = md5_hh(c, d, a, b, x[i+ 7], 16, -155497632);
    99 b = md5_hh(b, c, d, a, x[i+10], 23, -1094730640);
    100 a = md5_hh(a, b, c, d, x[i+13], 4 , 681279174);
    101 d = md5_hh(d, a, b, c, x[i+ 0], 11, -358537222);
    102 c = md5_hh(c, d, a, b, x[i+ 3], 16, -722521979);
    103 b = md5_hh(b, c, d, a, x[i+ 6], 23, 76029189);
    104 a = md5_hh(a, b, c, d, x[i+ 9], 4 , -640364487);
    105 d = md5_hh(d, a, b, c, x[i+12], 11, -421815835);
    106 c = md5_hh(c, d, a, b, x[i+15], 16, 530742520);
    107 b = md5_hh(b, c, d, a, x[i+ 2], 23, -995338651);
    108 109 a = md5_ii(a, b, c, d, x[i+ 0], 6 , -198630844);
    110 d = md5_ii(d, a, b, c, x[i+ 7], 10, 1126891415);
    111 c = md5_ii(c, d, a, b, x[i+14], 15, -1416354905);
    112 b = md5_ii(b, c, d, a, x[i+ 5], 21, -57434055);
    113 a = md5_ii(a, b, c, d, x[i+12], 6 , 1700485571);
    114 d = md5_ii(d, a, b, c, x[i+ 3], 10, -1894986606);
    115 c = md5_ii(c, d, a, b, x[i+10], 15, -1051523);
    116 b = md5_ii(b, c, d, a, x[i+ 1], 21, -2054922799);
    117 a = md5_ii(a, b, c, d, x[i+ 8], 6 , 1873313359);
    118 d = md5_ii(d, a, b, c, x[i+15], 10, -30611744);
    119 c = md5_ii(c, d, a, b, x[i+ 6], 15, -1560198380);
    120 b = md5_ii(b, c, d, a, x[i+13], 21, 1309151649);
    121 a = md5_ii(a, b, c, d, x[i+ 4], 6 , -145523070);
    122 d = md5_ii(d, a, b, c, x[i+11], 10, -1120210379);
    123 c = md5_ii(c, d, a, b, x[i+ 2], 15, 718787259);
    124 b = md5_ii(b, c, d, a, x[i+ 9], 21, -343485551);
    125 126 a = safe_add(a, olda);
    127 b = safe_add(b, oldb);
    128 c = safe_add(c, oldc);
    129 d = safe_add(d, oldd);
    130 }
    131 return Array(a, b, c, d);
    132 
    133 }
    134 
    135 /*
    136 * These functions implement the four basic operations the algorithm uses.137*/
    138 function md5_cmn(q, a, b, x, s, t)139 {
    140 return safe_add(bit_rol(safe_add(safe_add(a, q), safe_add(x, t)), s),b);
    141 }
    142 function md5_ff(a, b, c, d, x, s, t)143 {
    144 return md5_cmn((b & c) | ((~b) & d), a, b, x, s, t);
    145 }
    146 function md5_gg(a, b, c, d, x, s, t)147 {
    148 return md5_cmn((b & d) | (c & (~d)), a, b, x, s, t);
    149 }
    150 function md5_hh(a, b, c, d, x, s, t)
    151 {
    152 return md5_cmn(b ^ c ^ d, a, b, x, s, t);
    153 }
    154 function md5_ii(a, b, c, d, x, s, t)
    155 {
    156 return md5_cmn(c ^ (b | (~d)), a, b, x, s, t);
    157 }
    158
    159 
    /*160 * Calculate the HMAC-MD5, of a key and some data161*/
    162 function core_hmac_md5(key, data)163 {
    164 var bkey = str2binl(key);
    165 if(bkey.length > 16) bkey = core_md5(bkey, key.length * chrsz);
    166 167 var ipad = Array(16), opad = Array(16);
    168 for(var i = 0;
    i < 16;
    i++)169 {
    170 ipad[i] = bkey[i] ^ 0x36363636;
    171 opad[i] = bkey[i] ^ 0x5C5C5C5C;
    172 }
    173 
    174 var hash = core_md5(ipad.concat(str2binl(data)), 512 + data.length * chrsz);
    175 return core_md5(opad.concat(hash), 512 + 128);
    176 }
    177 
    178 
    /*179 * Add integers, wrapping at 2^32. This uses 16-bit operations internally180 * to work around bugs in some JS interpreters.181*/
    182 function safe_add(x, y)183 {
    184 var lsw = (x & 0xFFFF) + (y & 0xFFFF);
    185 var msw = (x >> 16) + (y >> 16) + (lsw >> 16);
    186 return (msw << 16) | (lsw & 0xFFFF);
    187 }
    188 
    189 
    /*190 * Bitwise rotate a 32-bit number to the left.191*/
    192 function bit_rol(num, cnt)193 {
    194 return (num << cnt) | (num >>> (32 - cnt));
    195 }
    196 
    197 
    /*198 * Convert a string to an array of little-endian words199 * If chrsz is ASCII, characters >255 have their hi-byte silently ignored.200*/
    201 function str2binl(str)202 {
    203 var bin = Array();
    204 var mask = (1 << chrsz) - 1;
    205 for(var i = 0;
    i < str.length * chrsz;
    i += chrsz)206 bin[i>>5] |= (str.charCodeAt(i / chrsz) & mask) << (i%32);
    207 return bin;
    208 }
    209 
    210 
    /*211 * Convert an array of little-endian words to a string212*/
    213 function binl2str(bin)214 {
    215 var str = "";
    216 var mask = (1 << chrsz) - 1;
    217 for(var i = 0;
    i < bin.length * 32;
    i += chrsz)218 str += String.fromCharCode((bin[i>>5] >>> (i % 32)) & mask);
    219 return str;
    220 }
    221 222 
    /*223 * Convert an array of little-endian words to a hex string.224*/
    225 function binl2hex(binarray)226 {
    227 var hex_tab = hexcase ? "0123456789ABCDEF" : "0123456789abcdef";
    228 var str = "";
    229 for(var i = 0;
    i < binarray.length * 4;
    i++)230 {
    231 str += hex_tab.charAt((binarray[i>>2] >> ((i%4)*8+4)) & 0xF) +232 hex_tab.charAt((binarray[i>>2] >> ((i%4)*8 )) & 0xF);
    233 }
    234 return str;
    235 }
    236 237 
    /*238 * Convert an array of little-endian words to a base-64 string239*/
    240 function binl2b64(binarray)241 {
    242 var tab = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
    243 var str = "";
    244 for(var i = 0;
    i < binarray.length * 4;
    i += 3)245 {
    246 var triplet = (((binarray[i >> 2] >> 8 * ( i %4)) & 0xFF) << 16)247 | (((binarray[i+1 >> 2] >> 8 * ((i+1)%4)) & 0xFF) << 8 )248 | ((binarray[i+2 >> 2] >> 8 * ((i+2)%4)) & 0xFF);
    249 for(var j = 0;
    j < 4;
    j++)250 {
    251 if(i * 8 + j * 6 > binarray.length * 32) str += b64pad;
    252 else str += tab.charAt((triplet >> 6*(3-j)) & 0x3F);
    253 }
    254 }
    255 return str;
    256 }

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