JavaScript实现MD5 加密的6方式

关于MD5：

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)

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 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.  
     }

测试

1.  
   <script src="js/md5.js"></script>
2.  
   <script>
3.  
   var code = "123456";
4.  
   var username = "123456";
5.  
   var password = "123456";
6.  
   var str1 = hex_md5("123456");
7.  
   var str2 = b64_md5("123456");
8.  
   var str3 = str_md5("123456");
9.  
   var str4 = hex_hmac_md5(code,code);
10.  
    var str5 = b64_hmac_md5(username,username);
11.  
    var str6 = str_hmac_md5(password,password);
12.  
    console.log(str1); // e10adc3949ba59abbe56e057f20f883e
13.  
    console.log(str2); // 4QrcOUm6Wau VuBX8g IPg
14.  
    console.log(str3); // áÜ9IºY«¾VàWò��>
15.  
    console.log(str4); // 30ce71a73bdd908c3955a90e8f7429ef
16.  
    console.log(str5); // MM5xpzvdkIw5VakOj3Qp7w
17.  
    console.log(str6); // 0Îq§;Ý��9U©��t)ï
18.  
    </script>

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