JS中的MD5加密方法

 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 }