Gemeinschaft Lernen Tools-Bibliothek Freizeit
suchen
Deutsch
Heim > Web-Frontend > js-Tutorial > Javascript MD4_基础知识

Javascript MD4_基础知识

WBOY
Freigeben： 2016-05-16 19:23:15
Original
1161 Leute haben es durchsucht
From:http://pajhome.org.uk/crypt/md5/md4src.html
<span class="comment">/*
 * A JavaScript implementation of the RSA Data Security, Inc. MD4 Message
 * Digest Algorithm, as defined in RFC 1320.
 * Version 2.1 Copyright (C) Jerrad Pierce, Paul Johnston 1999 - 2002.
 * Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet
 * Distributed under the BSD License
 * See http://pajhome.org.uk/crypt/md5 for more info.
 */</span>

<span class="comment">/*
 * Configurable variables. You may need to tweak these to be compatible with
 * the server-side, but the defaults work in most cases.
 */</span>
<span class="reserved_word">var</span> hexcase <span class="symbol">=</span> <span class="numeric">0</span><span class="symbol">;</span> <span class="comment">/* hex output format. 0 - lowercase; 1 - uppercase    */</span>
<span class="reserved_word">var</span> b64pad <span class="symbol">=</span> <span class="string">""</span><span class="symbol">;</span> <span class="comment">/* base-64 pad character. "=" for strict RFC compliance  */</span>
<span class="reserved_word">var</span> chrsz  <span class="symbol">=</span> <span class="numeric">8</span><span class="symbol">;</span> <span class="comment">/* bits per input character. 8 - ASCII; 16 - Unicode   */</span>

<span class="comment">/*
 * These are the functions you'll usually want to call
 */</span>
<span class="reserved_word">function</span> hex_md4<span class="braces">(</span>s<span class="braces">)</span><span class="braces">{</span> <span class="reserved_word">return</span> binl2hex<span class="braces">(</span>core_md4<span class="braces">(</span>str2binl<span class="braces">(</span>s<span class="braces">)</span>, s.<span class="predefined_identifier">length</span> * chrsz<span class="braces">)</span><span class="braces">)</span><span class="symbol">;</span><span class="braces">}</span>
<span class="reserved_word">function</span> b64_md4<span class="braces">(</span>s<span class="braces">)</span><span class="braces">{</span> <span class="reserved_word">return</span> binl2b64<span class="braces">(</span>core_md4<span class="braces">(</span>str2binl<span class="braces">(</span>s<span class="braces">)</span>, s.<span class="predefined_identifier">length</span> * chrsz<span class="braces">)</span><span class="braces">)</span><span class="symbol">;</span><span class="braces">}</span>
<span class="reserved_word">function</span> str_md4<span class="braces">(</span>s<span class="braces">)</span><span class="braces">{</span> <span class="reserved_word">return</span> binl2str<span class="braces">(</span>core_md4<span class="braces">(</span>str2binl<span class="braces">(</span>s<span class="braces">)</span>, s.<span class="predefined_identifier">length</span> * chrsz<span class="braces">)</span><span class="braces">)</span><span class="symbol">;</span><span class="braces">}</span>
<span class="reserved_word">function</span> hex_hmac_md4<span class="braces">(</span>key, data<span class="braces">)</span> <span class="braces">{</span> <span class="reserved_word">return</span> binl2hex<span class="braces">(</span>core_hmac_md4<span class="braces">(</span>key, data<span class="braces">)</span><span class="braces">)</span><span class="symbol">;</span> <span class="braces">}</span>
<span class="reserved_word">function</span> b64_hmac_md4<span class="braces">(</span>key, data<span class="braces">)</span> <span class="braces">{</span> <span class="reserved_word">return</span> binl2b64<span class="braces">(</span>core_hmac_md4<span class="braces">(</span>key, data<span class="braces">)</span><span class="braces">)</span><span class="symbol">;</span> <span class="braces">}</span>
<span class="reserved_word">function</span> str_hmac_md4<span class="braces">(</span>key, data<span class="braces">)</span> <span class="braces">{</span> <span class="reserved_word">return</span> binl2str<span class="braces">(</span>core_hmac_md4<span class="braces">(</span>key, data<span class="braces">)</span><span class="braces">)</span><span class="symbol">;</span> <span class="braces">}</span>

<span class="comment">/* 
 * Perform a simple self-test to see if the VM is working 
 */</span>
<span class="reserved_word">function</span> md4_vm_test<span class="braces">(</span><span class="braces">)</span>
<span class="braces">{</span>
 <span class="reserved_word">return</span> hex_md4<span class="braces">(</span><span class="string">"abc"</span><span class="braces">)</span> <span class="symbol">=</span><span class="symbol">=</span> <span class="string">"a448017aaf21d8525fc10ae87aa6729d"</span><span class="symbol">;</span>
<span class="braces">}</span>

<span class="comment">/*
 * Calculate the MD4 of an array of little-endian words, and a bit length
 */</span>
<span class="reserved_word">function</span> core_md4<span class="braces">(</span>x, len<span class="braces">)</span>
<span class="braces">{</span>
 <span class="comment">/* append padding */</span>
 x[len <span class="symbol">></span><span class="symbol">></span> <span class="numeric">5</span>] <span class="symbol">|</span><span class="symbol">=</span> <span class="numeric">0x80</span> <span class="symbol"><span class="symbol"> <span class="braces">(</span>len % <span class="numeric">32</span><span class="braces">)</span><span class="symbol">;</span>
 x[<span class="braces">(</span><span class="braces">(</span><span class="braces">(</span>len + <span class="numeric">64</span><span class="braces">)</span> <span class="symbol">></span><span class="symbol">></span><span class="symbol">></span> <span class="numeric">9</span><span class="braces">)</span> <span class="symbol"><span class="symbol"> <span class="numeric">4</span><span class="braces">)</span> + <span class="numeric">14</span>] <span class="symbol">=</span> len<span class="symbol">;</span>
 
 <span class="reserved_word">var</span> a <span class="symbol">=</span> <span class="numeric">1732584193</span><span class="symbol">;</span>
 <span class="reserved_word">var</span> b <span class="symbol">=</span> -<span class="numeric">271733879</span><span class="symbol">;</span>
 <span class="reserved_word">var</span> c <span class="symbol">=</span> -<span class="numeric">1732584194</span><span class="symbol">;</span>
 <span class="reserved_word">var</span> d <span class="symbol">=</span> <span class="numeric">271733878</span><span class="symbol">;</span>

 <span class="reserved_word">for</span><span class="braces">(</span><span class="reserved_word">var</span> i <span class="symbol">=</span> <span class="numeric">0</span><span class="symbol">;</span> i <span class="symbol"> x.<span class="predefined_identifier">length</span><span class="symbol">;</span> i +<span class="symbol">=</span> <span class="numeric">16</span><span class="braces">)</span>
 <span class="braces">{</span>
  <span class="reserved_word">var</span> olda <span class="symbol">=</span> a<span class="symbol">;</span>
  <span class="reserved_word">var</span> oldb <span class="symbol">=</span> b<span class="symbol">;</span>
  <span class="reserved_word">var</span> oldc <span class="symbol">=</span> c<span class="symbol">;</span>
  <span class="reserved_word">var</span> oldd <span class="symbol">=</span> d<span class="symbol">;</span>

  a <span class="symbol">=</span> md4_ff<span class="braces">(</span>a, b, c, d, x[i+ <span class="numeric">0</span>], <span class="numeric">3</span> <span class="braces">)</span><span class="symbol">;</span>
  d <span class="symbol">=</span> md4_ff<span class="braces">(</span>d, a, b, c, x[i+ <span class="numeric">1</span>], <span class="numeric">7</span> <span class="braces">)</span><span class="symbol">;</span>
  c <span class="symbol">=</span> md4_ff<span class="braces">(</span>c, d, a, b, x[i+ <span class="numeric">2</span>], <span class="numeric">11</span><span class="braces">)</span><span class="symbol">;</span>
  b <span class="symbol">=</span> md4_ff<span class="braces">(</span>b, c, d, a, x[i+ <span class="numeric">3</span>], <span class="numeric">19</span><span class="braces">)</span><span class="symbol">;</span>
  a <span class="symbol">=</span> md4_ff<span class="braces">(</span>a, b, c, d, x[i+ <span class="numeric">4</span>], <span class="numeric">3</span> <span class="braces">)</span><span class="symbol">;</span>
  d <span class="symbol">=</span> md4_ff<span class="braces">(</span>d, a, b, c, x[i+ <span class="numeric">5</span>], <span class="numeric">7</span> <span class="braces">)</span><span class="symbol">;</span>
  c <span class="symbol">=</span> md4_ff<span class="braces">(</span>c, d, a, b, x[i+ <span class="numeric">6</span>], <span class="numeric">11</span><span class="braces">)</span><span class="symbol">;</span>
  b <span class="symbol">=</span> md4_ff<span class="braces">(</span>b, c, d, a, x[i+ <span class="numeric">7</span>], <span class="numeric">19</span><span class="braces">)</span><span class="symbol">;</span>
  a <span class="symbol">=</span> md4_ff<span class="braces">(</span>a, b, c, d, x[i+ <span class="numeric">8</span>], <span class="numeric">3</span> <span class="braces">)</span><span class="symbol">;</span>
  d <span class="symbol">=</span> md4_ff<span class="braces">(</span>d, a, b, c, x[i+ <span class="numeric">9</span>], <span class="numeric">7</span> <span class="braces">)</span><span class="symbol">;</span>
  c <span class="symbol">=</span> md4_ff<span class="braces">(</span>c, d, a, b, x[i+<span class="numeric">10</span>], <span class="numeric">11</span><span class="braces">)</span><span class="symbol">;</span>
  b <span class="symbol">=</span> md4_ff<span class="braces">(</span>b, c, d, a, x[i+<span class="numeric">11</span>], <span class="numeric">19</span><span class="braces">)</span><span class="symbol">;</span>
  a <span class="symbol">=</span> md4_ff<span class="braces">(</span>a, b, c, d, x[i+<span class="numeric">12</span>], <span class="numeric">3</span> <span class="braces">)</span><span class="symbol">;</span>
  d <span class="symbol">=</span> md4_ff<span class="braces">(</span>d, a, b, c, x[i+<span class="numeric">13</span>], <span class="numeric">7</span> <span class="braces">)</span><span class="symbol">;</span>
  c <span class="symbol">=</span> md4_ff<span class="braces">(</span>c, d, a, b, x[i+<span class="numeric">14</span>], <span class="numeric">11</span><span class="braces">)</span><span class="symbol">;</span>
  b <span class="symbol">=</span> md4_ff<span class="braces">(</span>b, c, d, a, x[i+<span class="numeric">15</span>], <span class="numeric">19</span><span class="braces">)</span><span class="symbol">;</span>

  a <span class="symbol">=</span> md4_gg<span class="braces">(</span>a, b, c, d, x[i+ <span class="numeric">0</span>], <span class="numeric">3</span> <span class="braces">)</span><span class="symbol">;</span>
  d <span class="symbol">=</span> md4_gg<span class="braces">(</span>d, a, b, c, x[i+ <span class="numeric">4</span>], <span class="numeric">5</span> <span class="braces">)</span><span class="symbol">;</span>
  c <span class="symbol">=</span> md4_gg<span class="braces">(</span>c, d, a, b, x[i+ <span class="numeric">8</span>], <span class="numeric">9</span> <span class="braces">)</span><span class="symbol">;</span>
  b <span class="symbol">=</span> md4_gg<span class="braces">(</span>b, c, d, a, x[i+<span class="numeric">12</span>], <span class="numeric">13</span><span class="braces">)</span><span class="symbol">;</span>
  a <span class="symbol">=</span> md4_gg<span class="braces">(</span>a, b, c, d, x[i+ <span class="numeric">1</span>], <span class="numeric">3</span> <span class="braces">)</span><span class="symbol">;</span>
  d <span class="symbol">=</span> md4_gg<span class="braces">(</span>d, a, b, c, x[i+ <span class="numeric">5</span>], <span class="numeric">5</span> <span class="braces">)</span><span class="symbol">;</span>
  c <span class="symbol">=</span> md4_gg<span class="braces">(</span>c, d, a, b, x[i+ <span class="numeric">9</span>], <span class="numeric">9</span> <span class="braces">)</span><span class="symbol">;</span>
  b <span class="symbol">=</span> md4_gg<span class="braces">(</span>b, c, d, a, x[i+<span class="numeric">13</span>], <span class="numeric">13</span><span class="braces">)</span><span class="symbol">;</span>
  a <span class="symbol">=</span> md4_gg<span class="braces">(</span>a, b, c, d, x[i+ <span class="numeric">2</span>], <span class="numeric">3</span> <span class="braces">)</span><span class="symbol">;</span>
  d <span class="symbol">=</span> md4_gg<span class="braces">(</span>d, a, b, c, x[i+ <span class="numeric">6</span>], <span class="numeric">5</span> <span class="braces">)</span><span class="symbol">;</span>
  c <span class="symbol">=</span> md4_gg<span class="braces">(</span>c, d, a, b, x[i+<span class="numeric">10</span>], <span class="numeric">9</span> <span class="braces">)</span><span class="symbol">;</span>
  b <span class="symbol">=</span> md4_gg<span class="braces">(</span>b, c, d, a, x[i+<span class="numeric">14</span>], <span class="numeric">13</span><span class="braces">)</span><span class="symbol">;</span>
  a <span class="symbol">=</span> md4_gg<span class="braces">(</span>a, b, c, d, x[i+ <span class="numeric">3</span>], <span class="numeric">3</span> <span class="braces">)</span><span class="symbol">;</span>
  d <span class="symbol">=</span> md4_gg<span class="braces">(</span>d, a, b, c, x[i+ <span class="numeric">7</span>], <span class="numeric">5</span> <span class="braces">)</span><span class="symbol">;</span>
  c <span class="symbol">=</span> md4_gg<span class="braces">(</span>c, d, a, b, x[i+<span class="numeric">11</span>], <span class="numeric">9</span> <span class="braces">)</span><span class="symbol">;</span>
  b <span class="symbol">=</span> md4_gg<span class="braces">(</span>b, c, d, a, x[i+<span class="numeric">15</span>], <span class="numeric">13</span><span class="braces">)</span><span class="symbol">;</span>

  a <span class="symbol">=</span> md4_hh<span class="braces">(</span>a, b, c, d, x[i+ <span class="numeric">0</span>], <span class="numeric">3</span> <span class="braces">)</span><span class="symbol">;</span>
  d <span class="symbol">=</span> md4_hh<span class="braces">(</span>d, a, b, c, x[i+ <span class="numeric">8</span>], <span class="numeric">9</span> <span class="braces">)</span><span class="symbol">;</span>
  c <span class="symbol">=</span> md4_hh<span class="braces">(</span>c, d, a, b, x[i+ <span class="numeric">4</span>], <span class="numeric">11</span><span class="braces">)</span><span class="symbol">;</span>
  b <span class="symbol">=</span> md4_hh<span class="braces">(</span>b, c, d, a, x[i+<span class="numeric">12</span>], <span class="numeric">15</span><span class="braces">)</span><span class="symbol">;</span>
  a <span class="symbol">=</span> md4_hh<span class="braces">(</span>a, b, c, d, x[i+ <span class="numeric">2</span>], <span class="numeric">3</span> <span class="braces">)</span><span class="symbol">;</span>
  d <span class="symbol">=</span> md4_hh<span class="braces">(</span>d, a, b, c, x[i+<span class="numeric">10</span>], <span class="numeric">9</span> <span class="braces">)</span><span class="symbol">;</span>
  c <span class="symbol">=</span> md4_hh<span class="braces">(</span>c, d, a, b, x[i+ <span class="numeric">6</span>], <span class="numeric">11</span><span class="braces">)</span><span class="symbol">;</span>
  b <span class="symbol">=</span> md4_hh<span class="braces">(</span>b, c, d, a, x[i+<span class="numeric">14</span>], <span class="numeric">15</span><span class="braces">)</span><span class="symbol">;</span>
  a <span class="symbol">=</span> md4_hh<span class="braces">(</span>a, b, c, d, x[i+ <span class="numeric">1</span>], <span class="numeric">3</span> <span class="braces">)</span><span class="symbol">;</span>
  d <span class="symbol">=</span> md4_hh<span class="braces">(</span>d, a, b, c, x[i+ <span class="numeric">9</span>], <span class="numeric">9</span> <span class="braces">)</span><span class="symbol">;</span>
  c <span class="symbol">=</span> md4_hh<span class="braces">(</span>c, d, a, b, x[i+ <span class="numeric">5</span>], <span class="numeric">11</span><span class="braces">)</span><span class="symbol">;</span>
  b <span class="symbol">=</span> md4_hh<span class="braces">(</span>b, c, d, a, x[i+<span class="numeric">13</span>], <span class="numeric">15</span><span class="braces">)</span><span class="symbol">;</span>
  a <span class="symbol">=</span> md4_hh<span class="braces">(</span>a, b, c, d, x[i+ <span class="numeric">3</span>], <span class="numeric">3</span> <span class="braces">)</span><span class="symbol">;</span>
  d <span class="symbol">=</span> md4_hh<span class="braces">(</span>d, a, b, c, x[i+<span class="numeric">11</span>], <span class="numeric">9</span> <span class="braces">)</span><span class="symbol">;</span>
  c <span class="symbol">=</span> md4_hh<span class="braces">(</span>c, d, a, b, x[i+ <span class="numeric">7</span>], <span class="numeric">11</span><span class="braces">)</span><span class="symbol">;</span>
  b <span class="symbol">=</span> md4_hh<span class="braces">(</span>b, c, d, a, x[i+<span class="numeric">15</span>], <span class="numeric">15</span><span class="braces">)</span><span class="symbol">;</span>

  a <span class="symbol">=</span> safe_add<span class="braces">(</span>a, olda<span class="braces">)</span><span class="symbol">;</span>
  b <span class="symbol">=</span> safe_add<span class="braces">(</span>b, oldb<span class="braces">)</span><span class="symbol">;</span>
  c <span class="symbol">=</span> safe_add<span class="braces">(</span>c, oldc<span class="braces">)</span><span class="symbol">;</span>
  d <span class="symbol">=</span> safe_add<span class="braces">(</span>d, oldd<span class="braces">)</span><span class="symbol">;</span>

 <span class="braces">}</span>
 <span class="reserved_word">return</span> <span class="predefined_type">Array</span><span class="braces">(</span>a, b, c, d<span class="braces">)</span><span class="symbol">;</span>

<span class="braces">}</span>

<span class="comment">/*
 * These functions implement the basic operation for each round of the
 * algorithm.
 */</span>
<span class="reserved_word">function</span> md4_cmn<span class="braces">(</span>q, a, b, x, s, t<span class="braces">)</span>
<span class="braces">{</span>
 <span class="reserved_word">return</span> safe_add<span class="braces">(</span>rol<span class="braces">(</span>safe_add<span class="braces">(</span>safe_add<span class="braces">(</span>a, q<span class="braces">)</span>, safe_add<span class="braces">(</span>x, t<span class="braces">)</span><span class="braces">)</span>, s<span class="braces">)</span>, b<span class="braces">)</span><span class="symbol">;</span>
<span class="braces">}</span>
<span class="reserved_word">function</span> md4_ff<span class="braces">(</span>a, b, c, d, x, s<span class="braces">)</span>
<span class="braces">{</span>
 <span class="reserved_word">return</span> md4_cmn<span class="braces">(</span><span class="braces">(</span>b <span class="symbol">&</span> c<span class="braces">)</span> <span class="symbol">|</span> <span class="braces">(</span><span class="braces">(</span>~b<span class="braces">)</span> <span class="symbol">&</span> d<span class="braces">)</span>, a, <span class="numeric">0</span>, x, s, <span class="numeric">0</span><span class="braces">)</span><span class="symbol">;</span>
<span class="braces">}</span>
<span class="reserved_word">function</span> md4_gg<span class="braces">(</span>a, b, c, d, x, s<span class="braces">)</span>
<span class="braces">{</span>
 <span class="reserved_word">return</span> md4_cmn<span class="braces">(</span><span class="braces">(</span>b <span class="symbol">&</span> c<span class="braces">)</span> <span class="symbol">|</span> <span class="braces">(</span>b <span class="symbol">&</span> d<span class="braces">)</span> <span class="symbol">|</span> <span class="braces">(</span>c <span class="symbol">&</span> d<span class="braces">)</span>, a, <span class="numeric">0</span>, x, s, <span class="numeric">1518500249</span><span class="braces">)</span><span class="symbol">;</span>
<span class="braces">}</span>
<span class="reserved_word">function</span> md4_hh<span class="braces">(</span>a, b, c, d, x, s<span class="braces">)</span>
<span class="braces">{</span>
 <span class="reserved_word">return</span> md4_cmn<span class="braces">(</span>b ^ c ^ d, a, <span class="numeric">0</span>, x, s, <span class="numeric">1859775393</span><span class="braces">)</span><span class="symbol">;</span>
<span class="braces">}</span>

<span class="comment">/*
 * Calculate the HMAC-MD4, of a key and some data
 */</span>
<span class="reserved_word">function</span> core_hmac_md4<span class="braces">(</span>key, data<span class="braces">)</span>
<span class="braces">{</span>
 <span class="reserved_word">var</span> bkey <span class="symbol">=</span> str2binl<span class="braces">(</span>key<span class="braces">)</span><span class="symbol">;</span>
 <span class="reserved_word">if</span><span class="braces">(</span>bkey.<span class="predefined_identifier">length</span> <span class="symbol">></span> <span class="numeric">16</span><span class="braces">)</span> bkey <span class="symbol">=</span> core_md4<span class="braces">(</span>bkey, key.<span class="predefined_identifier">length</span> * chrsz<span class="braces">)</span><span class="symbol">;</span>

 <span class="reserved_word">var</span> ipad <span class="symbol">=</span> <span class="predefined_type">Array</span><span class="braces">(</span><span class="numeric">16</span><span class="braces">)</span>, opad <span class="symbol">=</span> <span class="predefined_type">Array</span><span class="braces">(</span><span class="numeric">16</span><span class="braces">)</span><span class="symbol">;</span>
 <span class="reserved_word">for</span><span class="braces">(</span><span class="reserved_word">var</span> i <span class="symbol">=</span> <span class="numeric">0</span><span class="symbol">;</span> i <span class="symbol"> <span class="numeric">16</span><span class="symbol">;</span> i++<span class="braces">)</span> 
 <span class="braces">{</span>
  ipad[i] <span class="symbol">=</span> bkey[i] ^ <span class="numeric">0x36363636</span><span class="symbol">;</span>
  opad[i] <span class="symbol">=</span> bkey[i] ^ <span class="numeric">0x5C5C5C5C</span><span class="symbol">;</span>
 <span class="braces">}</span>

 <span class="reserved_word">var</span> <span class="predefined_identifier">hash</span> <span class="symbol">=</span> core_md4<span class="braces">(</span>ipad.concat<span class="braces">(</span>str2binl<span class="braces">(</span>data<span class="braces">)</span><span class="braces">)</span>, <span class="numeric">512</span> + data.<span class="predefined_identifier">length</span> * chrsz<span class="braces">)</span><span class="symbol">;</span>
 <span class="reserved_word">return</span> core_md4<span class="braces">(</span>opad.concat<span class="braces">(</span><span class="predefined_identifier">hash</span><span class="braces">)</span>, <span class="numeric">512</span> + <span class="numeric">128</span><span class="braces">)</span><span class="symbol">;</span>
<span class="braces">}</span>

<span class="comment">/*
 * Add integers, wrapping at 2^32. This uses 16-bit operations internally
 * to work around bugs in some JS interpreters.
 */</span>
<span class="reserved_word">function</span> safe_add<span class="braces">(</span>x, y<span class="braces">)</span>
<span class="braces">{</span>
 <span class="reserved_word">var</span> lsw <span class="symbol">=</span> <span class="braces">(</span>x <span class="symbol">&</span> <span class="numeric">0xFFFF</span><span class="braces">)</span> + <span class="braces">(</span>y <span class="symbol">&</span> <span class="numeric">0xFFFF</span><span class="braces">)</span><span class="symbol">;</span>
 <span class="reserved_word">var</span> msw <span class="symbol">=</span> <span class="braces">(</span>x <span class="symbol">></span><span class="symbol">></span> <span class="numeric">16</span><span class="braces">)</span> + <span class="braces">(</span>y <span class="symbol">></span><span class="symbol">></span> <span class="numeric">16</span><span class="braces">)</span> + <span class="braces">(</span>lsw <span class="symbol">></span><span class="symbol">></span> <span class="numeric">16</span><span class="braces">)</span><span class="symbol">;</span>
 <span class="reserved_word">return</span> <span class="braces">(</span>msw <span class="symbol"><span class="symbol"> <span class="numeric">16</span><span class="braces">)</span> <span class="symbol">|</span> <span class="braces">(</span>lsw <span class="symbol">&</span> <span class="numeric">0xFFFF</span><span class="braces">)</span><span class="symbol">;</span>
<span class="braces">}</span>

<span class="comment">/*
 * Bitwise rotate a 32-bit number to the left.
 */</span>
<span class="reserved_word">function</span> rol<span class="braces">(</span>num, cnt<span class="braces">)</span>
<span class="braces">{</span>
 <span class="reserved_word">return</span> <span class="braces">(</span>num <span class="symbol"><span class="symbol"> cnt<span class="braces">)</span> <span class="symbol">|</span> <span class="braces">(</span>num <span class="symbol">></span><span class="symbol">></span><span class="symbol">></span> <span class="braces">(</span><span class="numeric">32</span> - cnt<span class="braces">)</span><span class="braces">)</span><span class="symbol">;</span>
<span class="braces">}</span>

<span class="comment">/*
 * Convert a string to an array of little-endian words
 * If chrsz is ASCII, characters >255 have their hi-byte silently ignored.
 */</span>
<span class="reserved_word">function</span> str2binl<span class="braces">(</span>str<span class="braces">)</span>
<span class="braces">{</span>
 <span class="reserved_word">var</span> bin <span class="symbol">=</span> <span class="predefined_type">Array</span><span class="braces">(</span><span class="braces">)</span><span class="symbol">;</span>
 <span class="reserved_word">var</span> mask <span class="symbol">=</span> <span class="braces">(</span><span class="numeric">1</span> <span class="symbol"><span class="symbol"> chrsz<span class="braces">)</span> - <span class="numeric">1</span><span class="symbol">;</span>
 <span class="reserved_word">for</span><span class="braces">(</span><span class="reserved_word">var</span> i <span class="symbol">=</span> <span class="numeric">0</span><span class="symbol">;</span> i <span class="symbol"> str.<span class="predefined_identifier">length</span> * chrsz<span class="symbol">;</span> i +<span class="symbol">=</span> chrsz<span class="braces">)</span>
  bin[i<span class="symbol">></span><span class="symbol">></span><span class="numeric">5</span>] <span class="symbol">|</span><span class="symbol">=</span> <span class="braces">(</span>str.charCodeAt<span class="braces">(</span>i <span class="symbol">/</span> chrsz<span class="braces">)</span> <span class="symbol">&</span> mask<span class="braces">)</span> <span class="symbol"><span class="symbol"> <span class="braces">(</span>i%<span class="numeric">32</span><span class="braces">)</span><span class="symbol">;</span>
 <span class="reserved_word">return</span> bin<span class="symbol">;</span>
<span class="braces">}</span>

<span class="comment">/*
 * Convert an array of little-endian words to a string
 */</span>
<span class="reserved_word">function</span> binl2str<span class="braces">(</span>bin<span class="braces">)</span>
<span class="braces">{</span>
 <span class="reserved_word">var</span> str <span class="symbol">=</span> <span class="string">""</span><span class="symbol">;</span>
 <span class="reserved_word">var</span> mask <span class="symbol">=</span> <span class="braces">(</span><span class="numeric">1</span> <span class="symbol"><span class="symbol"> chrsz<span class="braces">)</span> - <span class="numeric">1</span><span class="symbol">;</span>
 <span class="reserved_word">for</span><span class="braces">(</span><span class="reserved_word">var</span> i <span class="symbol">=</span> <span class="numeric">0</span><span class="symbol">;</span> i <span class="symbol"> bin.<span class="predefined_identifier">length</span> * <span class="numeric">32</span><span class="symbol">;</span> i +<span class="symbol">=</span> chrsz<span class="braces">)</span>
  str +<span class="symbol">=</span> String.fromCharCode<span class="braces">(</span><span class="braces">(</span>bin[i<span class="symbol">></span><span class="symbol">></span><span class="numeric">5</span>] <span class="symbol">></span><span class="symbol">></span><span class="symbol">></span> <span class="braces">(</span>i % <span class="numeric">32</span><span class="braces">)</span><span class="braces">)</span> <span class="symbol">&</span> mask<span class="braces">)</span><span class="symbol">;</span>
 <span class="reserved_word">return</span> str<span class="symbol">;</span>
<span class="braces">}</span>

<span class="comment">/*
 * Convert an array of little-endian words to a hex string.
 */</span>
<span class="reserved_word">function</span> binl2hex<span class="braces">(</span>binarray<span class="braces">)</span>
<span class="braces">{</span>
 <span class="reserved_word">var</span> hex_tab <span class="symbol">=</span> hexcase ? <span class="string">"0123456789ABCDEF"</span> : <span class="string">"0123456789abcdef"</span><span class="symbol">;</span>
 <span class="reserved_word">var</span> str <span class="symbol">=</span> <span class="string">""</span><span class="symbol">;</span>
 <span class="reserved_word">for</span><span class="braces">(</span><span class="reserved_word">var</span> i <span class="symbol">=</span> <span class="numeric">0</span><span class="symbol">;</span> i <span class="symbol"> binarray.<span class="predefined_identifier">length</span> * <span class="numeric">4</span><span class="symbol">;</span> i++<span class="braces">)</span>
 <span class="braces">{</span>
  str +<span class="symbol">=</span> hex_tab.<span class="library_function">charAt</span><span class="braces">(</span><span class="braces">(</span>binarray[i<span class="symbol">></span><span class="symbol">></span><span class="numeric">2</span>] <span class="symbol">></span><span class="symbol">></span> <span class="braces">(</span><span class="braces">(</span>i%<span class="numeric">4</span><span class="braces">)</span>*<span class="numeric">8</span>+<span class="numeric">4</span><span class="braces">)</span><span class="braces">)</span> <span class="symbol">&</span> <span class="numeric">0xF</span><span class="braces">)</span> +
      hex_tab.<span class="library_function">charAt</span><span class="braces">(</span><span class="braces">(</span>binarray[i<span class="symbol">></span><span class="symbol">></span><span class="numeric">2</span>] <span class="symbol">></span><span class="symbol">></span> <span class="braces">(</span><span class="braces">(</span>i%<span class="numeric">4</span><span class="braces">)</span>*<span class="numeric">8</span> <span class="braces">)</span><span class="braces">)</span> <span class="symbol">&</span> <span class="numeric">0xF</span><span class="braces">)</span><span class="symbol">;</span>
 <span class="braces">}</span>
 <span class="reserved_word">return</span> str<span class="symbol">;</span>
<span class="braces">}</span>

<span class="comment">/*
 * Convert an array of little-endian words to a base-64 string
 */</span>
<span class="reserved_word">function</span> binl2b64<span class="braces">(</span>binarray<span class="braces">)</span>
<span class="braces">{</span>
 <span class="reserved_word">var</span> tab <span class="symbol">=</span> <span class="string">"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"</span><span class="symbol">;</span>
 <span class="reserved_word">var</span> str <span class="symbol">=</span> <span class="string">""</span><span class="symbol">;</span>
 <span class="reserved_word">for</span><span class="braces">(</span><span class="reserved_word">var</span> i <span class="symbol">=</span> <span class="numeric">0</span><span class="symbol">;</span> i <span class="symbol"> binarray.<span class="predefined_identifier">length</span> * <span class="numeric">4</span><span class="symbol">;</span> i +<span class="symbol">=</span> <span class="numeric">3</span><span class="braces">)</span>
 <span class="braces">{</span>
  <span class="reserved_word">var</span> triplet <span class="symbol">=</span> <span class="braces">(</span><span class="braces">(</span><span class="braces">(</span>binarray[i  <span class="symbol">></span><span class="symbol">></span> <span class="numeric">2</span>] <span class="symbol">></span><span class="symbol">></span> <span class="numeric">8</span> * <span class="braces">(</span> i  %<span class="numeric">4</span><span class="braces">)</span><span class="braces">)</span> <span class="symbol">&</span> <span class="numeric">0xFF</span><span class="braces">)</span> <span class="symbol"><span class="symbol"> <span class="numeric">16</span><span class="braces">)</span>
        <span class="symbol">|</span> <span class="braces">(</span><span class="braces">(</span><span class="braces">(</span>binarray[i+<span class="numeric">1</span> <span class="symbol">></span><span class="symbol">></span> <span class="numeric">2</span>] <span class="symbol">></span><span class="symbol">></span> <span class="numeric">8</span> * <span class="braces">(</span><span class="braces">(</span>i+<span class="numeric">1</span><span class="braces">)</span>%<span class="numeric">4</span><span class="braces">)</span><span class="braces">)</span> <span class="symbol">&</span> <span class="numeric">0xFF</span><span class="braces">)</span> <span class="symbol"><span class="symbol"> <span class="numeric">8</span> <span class="braces">)</span>
        <span class="symbol">|</span> <span class="braces">(</span><span class="braces">(</span>binarray[i+<span class="numeric">2</span> <span class="symbol">></span><span class="symbol">></span> <span class="numeric">2</span>] <span class="symbol">></span><span class="symbol">></span> <span class="numeric">8</span> * <span class="braces">(</span><span class="braces">(</span>i+<span class="numeric">2</span><span class="braces">)</span>%<span class="numeric">4</span><span class="braces">)</span><span class="braces">)</span> <span class="symbol">&</span> <span class="numeric">0xFF</span><span class="braces">)</span><span class="symbol">;</span>
  <span class="reserved_word">for</span><span class="braces">(</span><span class="reserved_word">var</span> j <span class="symbol">=</span> <span class="numeric">0</span><span class="symbol">;</span> j <span class="symbol"> <span class="numeric">4</span><span class="symbol">;</span> j++<span class="braces">)</span>
  <span class="braces">{</span>
   <span class="reserved_word">if</span><span class="braces">(</span>i * <span class="numeric">8</span> + j * <span class="numeric">6</span> <span class="symbol">></span> binarray.<span class="predefined_identifier">length</span> * <span class="numeric">32</span><span class="braces">)</span> str +<span class="symbol">=</span> b64pad<span class="symbol">;</span>
   <span class="reserved_word">else</span> str +<span class="symbol">=</span> tab.<span class="library_function">charAt</span><span class="braces">(</span><span class="braces">(</span>triplet <span class="symbol">></span><span class="symbol">></span> <span class="numeric">6</span>*<span class="braces">(</span><span class="numeric">3</span>-j<span class="braces">)</span><span class="braces">)</span> <span class="symbol">&</span> <span class="numeric">0x3F</span><span class="braces">)</span><span class="symbol">;</span>
  <span class="braces">}</span>
 <span class="braces">}</span>
 <span class="reserved_word">return</span> str<span class="symbol">;</span>
<span class="braces">}</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>
Nach dem Login kopieren
Verwandte Etiketten：
javascript
Quelle：php.cn
Vorheriger Artikel：使用脚本控制网页Table的显示隐藏(全代码)_AX_javascript技巧 Nächster Artikel：用Javascript轻松制作一套简单的抽奖系统_javascript技巧
Erklärung dieser Website
Der Inhalt dieses Artikels wird freiwillig von Internetnutzern beigesteuert und das Urheberrecht liegt beim ursprünglichen Autor. Diese Website übernimmt keine entsprechende rechtliche Verantwortung. Wenn Sie Inhalte finden, bei denen der Verdacht eines Plagiats oder einer Rechtsverletzung besteht, wenden Sie sich bitte an admin@php.cn
Neueste Artikel des Autors
Aktuelle Ausgaben
Reine CSS-Methode zum dynamischen Ändern der Bildquelle beim Klicken ohne Verwendung von JavaScript Ich muss den Quellcode eines Bildes per Mausklick ändern, indem ich nur CSS wie img:active...
Aus 2024-04-06 19:25:49
0
1
505
Streudiagrammpunkte behalten beim Zoomen in d3.js keine Werte bei Dies ist das erste Mal, dass ich d3.js verwende. Bitte haben Sie Geduld. Ich habe es als r...
Aus 2024-04-06 18:16:26
0
1
403
JavaScript-Hover-Ereignisse für herstellerspezifische Pseudoelemente 我有以下htmlinput标签。$("input[type='range']::-webkit-slider-thumb").on('hover',functi...
Aus 2024-04-06 15:35:24
0
1
274
Formular ohne Schaltfläche mit Javascript/Jquery senden Ich versuche, ein Formular ohne Schaltfläche zu senden, indem ich eine JavaScript-Funktion...
Aus 2024-04-06 14:54:03
0
2
421
Passen Sie das Erscheinungsbild von Bootstrap-Akkordeon-Headern mithilfe der CollapseDisplay-Klasse an Ich möchte den Kartentitel eines Panels mit der Klasse Collapseshow formatieren. In diesem...
Aus 2024-04-06 12:53:11
0
1
376
verwandte Themen
Mehr>
Beliebte Empfehlungen
Beliebte Tutorials
Mehr>
Verwandte Tutorials
Beliebte Empfehlungen
Aktuelle Kurse
Neueste Downloads
Mehr>
Web-Effekte
Quellcode der Website
Website-Materialien
Frontend-Vorlage