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.
11 * Configurable variables. You may need to tweak these to be compatible with
12 * the server-side, but the defaults work in most cases.
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 */
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
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)); }
30 * Perform a simple self-test to see if the VM is working
32 function md5_vm_test()
34 return hex_md5("abc") == "900150983cd24fb0d6963f7d28e17f72";
38 * Calculate the MD5 of an array of little-endian words, and a bit length
41 function core_md5(x, len)
44 x[len >> 5] |= 0x80 << ((len) % 32);
45 x[(((len + 64) >>> 9) << 4) + 14] = len;
52 for(var i = 0; i < x.length; i += 16)
59 a = md5_ff(a, b, c, d, x[i+ 0], 7 , -680876936);
60 d = md5_ff(d, a, b, c, x[i+ 1], 12, -389564586);
61 c = md5_ff(c, d, a, b, x[i+ 2], 17, 606105819);
62 b = md5_ff(b, c, d, a, x[i+ 3], 22, -1044525330);
63 a = md5_ff(a, b, c, d, x[i+ 4], 7 , -176418897);
64 d = md5_ff(d, a, b, c, x[i+ 5], 12, 1200080426);
65 c = md5_ff(c, d, a, b, x[i+ 6], 17, -1473231341);
66 b = md5_ff(b, c, d, a, x[i+ 7], 22, -45705983);
67 a = md5_ff(a, b, c, d, x[i+ 8], 7 , 1770035416);
68 d = md5_ff(d, a, b, c, x[i+ 9], 12, -1958414417);
69 c = md5_ff(c, d, a, b, x[i+10], 17, -42063);
70 b = md5_ff(b, c, d, a, x[i+11], 22, -1990404162);
71 a = md5_ff(a, b, c, d, x[i+12], 7 , 1804603682);
72 d = md5_ff(d, a, b, c, x[i+13], 12, -40341101);
73 c = md5_ff(c, d, a, b, x[i+14], 17, -1502002290);
74 b = md5_ff(b, c, d, a, x[i+15], 22, 1236535329);
76 a = md5_gg(a, b, c, d, x[i+ 1], 5 , -165796510);
77 d = md5_gg(d, a, b, c, x[i+ 6], 9 , -1069501632);
78 c = md5_gg(c, d, a, b, x[i+11], 14, 643717713);
79 b = md5_gg(b, c, d, a, x[i+ 0], 20, -373897302);
80 a = md5_gg(a, b, c, d, x[i+ 5], 5 , -701558691);
81 d = md5_gg(d, a, b, c, x[i+10], 9 , 38016083);
82 c = md5_gg(c, d, a, b, x[i+15], 14, -660478335);
83 b = md5_gg(b, c, d, a, x[i+ 4], 20, -405537848);
84 a = md5_gg(a, b, c, d, x[i+ 9], 5 , 568446438);
85 d = md5_gg(d, a, b, c, x[i+14], 9 , -1019803690);
86 c = md5_gg(c, d, a, b, x[i+ 3], 14, -187363961);
87 b = md5_gg(b, c, d, a, x[i+ 8], 20, 1163531501);
88 a = md5_gg(a, b, c, d, x[i+13], 5 , -1444681467);
89 d = md5_gg(d, a, b, c, x[i+ 2], 9 , -51403784);
90 c = md5_gg(c, d, a, b, x[i+ 7], 14, 1735328473);
91 b = md5_gg(b, c, d, a, x[i+12], 20, -1926607734);
93 a = md5_hh(a, b, c, d, x[i+ 5], 4 , -378558);
94 d = md5_hh(d, a, b, c, x[i+ 8], 11, -2022574463);
95 c = md5_hh(c, d, a, b, x[i+11], 16, 1839030562);
96 b = md5_hh(b, c, d, a, x[i+14], 23, -35309556);
97 a = md5_hh(a, b, c, d, x[i+ 1], 4 , -1530992060);
98 d = md5_hh(d, a, b, c, x[i+ 4], 11, 1272893353);
99 c = md5_hh(c, d, a, b, x[i+ 7], 16, -155497632);
100 b = md5_hh(b, c, d, a, x[i+10], 23, -1094730640);
101 a = md5_hh(a, b, c, d, x[i+13], 4 , 681279174);
102 d = md5_hh(d, a, b, c, x[i+ 0], 11, -358537222);
103 c = md5_hh(c, d, a, b, x[i+ 3], 16, -722521979);
104 b = md5_hh(b, c, d, a, x[i+ 6], 23, 76029189);
105 a = md5_hh(a, b, c, d, x[i+ 9], 4 , -640364487);
106 d = md5_hh(d, a, b, c, x[i+12], 11, -421815835);
107 c = md5_hh(c, d, a, b, x[i+15], 16, 530742520);
108 b = md5_hh(b, c, d, a, x[i+ 2], 23, -995338651);
110 a = md5_ii(a, b, c, d, x[i+ 0], 6 , -198630844);
111 d = md5_ii(d, a, b, c, x[i+ 7], 10, 1126891415);
112 c = md5_ii(c, d, a, b, x[i+14], 15, -1416354905);
113 b = md5_ii(b, c, d, a, x[i+ 5], 21, -57434055);
114 a = md5_ii(a, b, c, d, x[i+12], 6 , 1700485571);
115 d = md5_ii(d, a, b, c, x[i+ 3], 10, -1894986606);
116 c = md5_ii(c, d, a, b, x[i+10], 15, -1051523);
117 b = md5_ii(b, c, d, a, x[i+ 1], 21, -2054922799);
118 a = md5_ii(a, b, c, d, x[i+ 8], 6 , 1873313359);
119 d = md5_ii(d, a, b, c, x[i+15], 10, -30611744);
120 c = md5_ii(c, d, a, b, x[i+ 6], 15, -1560198380);
121 b = md5_ii(b, c, d, a, x[i+13], 21, 1309151649);
122 a = md5_ii(a, b, c, d, x[i+ 4], 6 , -145523070);
123 d = md5_ii(d, a, b, c, x[i+11], 10, -1120210379);
124 c = md5_ii(c, d, a, b, x[i+ 2], 15, 718787259);
125 b = md5_ii(b, c, d, a, x[i+ 9], 21, -343485551);
127 a = safe_add(a, olda);
128 b = safe_add(b, oldb);
129 c = safe_add(c, oldc);
130 d = safe_add(d, oldd);
132 return Array(a, b, c, d);
137 * These functions implement the four basic operations the algorithm uses.
139 function md5_cmn(q, a, b, x, s, t)
141 return safe_add(bit_rol(safe_add(safe_add(a, q), safe_add(x, t)), s),b);
143 function md5_ff(a, b, c, d, x, s, t)
145 return md5_cmn((b & c) | ((~b) & d), a, b, x, s, t);
147 function md5_gg(a, b, c, d, x, s, t)
149 return md5_cmn((b & d) | (c & (~d)), a, b, x, s, t);
151 function md5_hh(a, b, c, d, x, s, t)
153 return md5_cmn(b ^ c ^ d, a, b, x, s, t);
155 function md5_ii(a, b, c, d, x, s, t)
157 return md5_cmn(c ^ (b | (~d)), a, b, x, s, t);
161 * Calculate the HMAC-MD5, of a key and some data
163 function core_hmac_md5(key, data)
165 var bkey = str2binl(key);
166 if(bkey.length > 16) bkey = core_md5(bkey, key.length * chrsz);
168 var ipad = Array(16), opad = Array(16);
169 for(var i = 0; i < 16; i++)
171 ipad[i] = bkey[i] ^ 0x36363636;
172 opad[i] = bkey[i] ^ 0x5C5C5C5C;
175 var hash = core_md5(ipad.concat(str2binl(data)), 512 + data.length * chrsz);
176 return core_md5(opad.concat(hash), 512 + 128);
180 * Add integers, wrapping at 2^32. This uses 16-bit operations internally
181 * to work around bugs in some JS interpreters.
183 function safe_add(x, y)
185 var lsw = (x & 0xFFFF) + (y & 0xFFFF);
186 var msw = (x >> 16) + (y >> 16) + (lsw >> 16);
187 return (msw << 16) | (lsw & 0xFFFF);
191 * Bitwise rotate a 32-bit number to the left.
193 function bit_rol(num, cnt)
195 return (num << cnt) | (num >>> (32 - cnt));
199 * Convert a string to an array of little-endian words
200 * If chrsz is ASCII, characters >255 have their hi-byte silently ignored.
203 function str2binl(str)
206 var mask = (1 << chrsz) - 1;
207 for(var i = 0; i < str.length * chrsz; i += chrsz)
208 bin[i>>5] |= (str.charCodeAt(i / chrsz) & mask) << (i%32);
213 * Convert an array of little-endian words to a string
215 function binl2str(bin)
218 var mask = (1 << chrsz) - 1;
219 for(var i = 0; i < bin.length * 32; i += chrsz)
220 str += String.fromCharCode((bin[i>>5] >>> (i % 32)) & mask);
225 * Convert an array of little-endian words to a hex string.
228 function binl2hex(binarray)
230 var hex_tab = hexcase ? "0123456789ABCDEF" : "0123456789abcdef";
232 for(var i = 0; i < binarray.length * 4; i++)
234 str += hex_tab.charAt((binarray[i>>2] >> ((i%4)*8+4)) & 0xF) +
235 hex_tab.charAt((binarray[i>>2] >> ((i%4)*8 )) & 0xF);
241 * Convert an array of little-endian words to a base-64 string
243 function binl2b64(binarray)
245 var tab = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
247 for(var i = 0; i < binarray.length * 4; i += 3)
249 var triplet = (((binarray[i >> 2] >> 8 * ( i %4)) & 0xFF) << 16)
250 | (((binarray[i+1 >> 2] >> 8 * ((i+1)%4)) & 0xFF) << 8 )
251 | ((binarray[i+2 >> 2] >> 8 * ((i+2)%4)) & 0xFF);
252 for(var j = 0; j < 4; j++)
254 if(i * 8 + j * 6 > binarray.length * 32) str += b64pad;
255 else str += tab.charAt((triplet >> 6*(3-j)) & 0x3F);
261 exports.hex = hex_md5;