MD5.js是通过前台js加密的方式对用户信息，密码等私密信息进行加密处理的工具，也可称为插件。
在本案例中 可以看到MD5共有6种加密方法：
1， hex_md5(value)
2， b64_md5(value)
3， str_md5(value)
4， hex_hmac_md5(key, data)
5， b64_hmac_md5(key, data)
6， str_hmac_md5(key, data)
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MD5.js 源代码如下 (若不想下载，可直接复制使用)：
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 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 data 161 */ 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 internally 180 * 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 words 199 * 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 string 212 */ 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 string 239 */ 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 }