js MD5加密处理

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)

下载地址：点击下载

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 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 }

MD5加密优缺点：

1，用js对私密信息加密可避免在网络中输入明文信息，被他人截取数据包而造成数据泄露。

2，避免缓存中自动缓存密码。比如在使用火狐浏览器登陆时，输入的用户名及密码自动缓存后，下次登陆无需输入密码就可实现登录，这样就给别人留下了漏洞，当别人使用你的电脑登陆那么你的密码就泄露了。使用js加密时，缓存的加密后的密文，用密文做密码登录是不成功的，即使泄露也是泄露的密文，对密码不会造成威胁。缺点是：每次登陆时都要手动输入密码，比较麻烦。

3，使用js加密，减少了服务器加密时的资源消耗，从理论上提高了服务器的性能。为了安全，很有必要在做服务端的加密，无论从理论还是实际，两道门比一道门要安全些，至少给攻击者造成了一个障碍。

使用详情：

    <script src="js/md5.js"></script><script>var code = "123456";var username = "123456";var password = "123456";var str1 = hex_md5("123456");var str2 = b64_md5("123456");var str3 = str_md5("123456");var str4 = hex_hmac_md5(code,code);var str5 = b64_hmac_md5(username,username);var str6 = str_hmac_md5(password,password);console.log(str1);            // e10adc3949ba59abbe56e057f20f883econsole.log(str2);            // 4QrcOUm6Wau+VuBX8g+IPgconsole.log(str3);            // áÜ9IºY«¾VàWò>console.log(str4);            // 30ce71a73bdd908c3955a90e8f7429efconsole.log(str5);            // MM5xpzvdkIw5VakOj3Qp7wconsole.log(str6);            // 0Îq§;Ý9U©t)ï</script>

转载于:https://www.cnblogs.com/CooLLYP/p/8628467.html

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