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| <a name="1" href="#1">1</a> <em class="jxr_comment">/*</em> |
| <a name="2" href="#2">2</a> <em class="jxr_comment"> * Licensed to the Apache Software Foundation (ASF) under one</em> |
| <a name="3" href="#3">3</a> <em class="jxr_comment"> * or more contributor license agreements. See the NOTICE file</em> |
| <a name="4" href="#4">4</a> <em class="jxr_comment"> * distributed with this work for additional information</em> |
| <a name="5" href="#5">5</a> <em class="jxr_comment"> * regarding copyright ownership. The ASF licenses this file</em> |
| <a name="6" href="#6">6</a> <em class="jxr_comment"> * to you under the Apache License, Version 2.0 (the</em> |
| <a name="7" href="#7">7</a> <em class="jxr_comment"> * "License"); you may not use this file except in compliance</em> |
| <a name="8" href="#8">8</a> <em class="jxr_comment"> * with the License. You may obtain a copy of the License at</em> |
| <a name="9" href="#9">9</a> <em class="jxr_comment"> *</em> |
| <a name="10" href="#10">10</a> <em class="jxr_comment"> * <a href="http://www.apache.org/licenses/LICENSE-2.0" target="alexandria_uri">http://www.apache.org/licenses/LICENSE-2.0</a></em> |
| <a name="11" href="#11">11</a> <em class="jxr_comment"> *</em> |
| <a name="12" href="#12">12</a> <em class="jxr_comment"> * Unless required by applicable law or agreed to in writing,</em> |
| <a name="13" href="#13">13</a> <em class="jxr_comment"> * software distributed under the License is distributed on an</em> |
| <a name="14" href="#14">14</a> <em class="jxr_comment"> * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY</em> |
| <a name="15" href="#15">15</a> <em class="jxr_comment"> * KIND, either express or implied. See the License for the</em> |
| <a name="16" href="#16">16</a> <em class="jxr_comment"> * specific language governing permissions and limitations</em> |
| <a name="17" href="#17">17</a> <em class="jxr_comment"> * under the License.</em> |
| <a name="18" href="#18">18</a> <em class="jxr_comment"> */</em> |
| <a name="19" href="#19">19</a> <em class="jxr_comment">/*</em> |
| <a name="20" href="#20">20</a> <em class="jxr_comment"> * The apr_md5_encode() routine in the APR project's apr_md5.c file uses much</em> |
| <a name="21" href="#21">21</a> <em class="jxr_comment"> * code obtained from the FreeBSD 3.0 MD5 crypt() function, which is licenced</em> |
| <a name="22" href="#22">22</a> <em class="jxr_comment"> * as follows:</em> |
| <a name="23" href="#23">23</a> <em class="jxr_comment"> * ----------------------------------------------------------------------------</em> |
| <a name="24" href="#24">24</a> <em class="jxr_comment"> * "THE BEER-WARE LICENSE" (Revision 42):</em> |
| <a name="25" href="#25">25</a> <em class="jxr_comment"> * <phk@login.dknet.dk> wrote this file. As long as you retain this notice you</em> |
| <a name="26" href="#26">26</a> <em class="jxr_comment"> * can do whatever you want with this stuff. If we meet some day, and you think</em> |
| <a name="27" href="#27">27</a> <em class="jxr_comment"> * this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp</em> |
| <a name="28" href="#28">28</a> <em class="jxr_comment"> * ----------------------------------------------------------------------------</em> |
| <a name="29" href="#29">29</a> <em class="jxr_comment"> */</em> |
| <a name="30" href="#30">30</a> <strong class="jxr_keyword">package</strong> org.apache.shiro.codec; |
| <a name="31" href="#31">31</a> |
| <a name="32" href="#32">32</a> <strong class="jxr_keyword">import</strong> java.io.IOException; |
| <a name="33" href="#33">33</a> |
| <a name="34" href="#34">34</a> <em class="jxr_javadoccomment">/**</em> |
| <a name="35" href="#35">35</a> <em class="jxr_javadoccomment"> * Codec for <a href="<a href="http://en.wikipedia.org/wiki/Crypt_(Unix)" target="alexandria_uri">http://en.wikipedia.org/wiki/Crypt_(Unix)</a>">Unix Crypt</a>-style encoding. While similar to</em> |
| <a name="36" href="#36">36</a> <em class="jxr_javadoccomment"> * Base64, it is not compatible with Base64.</em> |
| <a name="37" href="#37">37</a> <em class="jxr_javadoccomment"> * <p/></em> |
| <a name="38" href="#38">38</a> <em class="jxr_javadoccomment"> * This implementation is based on encoding algorithms found in the Apache Portable Runtime library's</em> |
| <a name="39" href="#39">39</a> <em class="jxr_javadoccomment"> * <a href="<a href="http://svn.apache.org/viewvc/apr/apr/trunk/crypto/apr_md5.c?revision=HEAD&view=markup" target="alexandria_uri">http://svn.apache.org/viewvc/apr/apr/trunk/crypto/apr_md5.c?revision=HEAD&view=markup</a>">apr_md5.c</a></em> |
| <a name="40" href="#40">40</a> <em class="jxr_javadoccomment"> * implementation for its {@code crypt}-style support. The APR team in turn received inspiration for its encoding</em> |
| <a name="41" href="#41">41</a> <em class="jxr_javadoccomment"> * implementation based on FreeBSD 3.0's {@code /usr/src/lib/libcrypt/crypt.c} implementation. The</em> |
| <a name="42" href="#42">42</a> <em class="jxr_javadoccomment"> * accompanying license headers have been retained at the top of this source file.</em> |
| <a name="43" href="#43">43</a> <em class="jxr_javadoccomment"> * <p/></em> |
| <a name="44" href="#44">44</a> <em class="jxr_javadoccomment"> * This file and all that it contains is ASL 2.0 compatible.</em> |
| <a name="45" href="#45">45</a> <em class="jxr_javadoccomment"> *</em> |
| <a name="46" href="#46">46</a> <em class="jxr_javadoccomment"> * @since 1.2</em> |
| <a name="47" href="#47">47</a> <em class="jxr_javadoccomment"> */</em> |
| <a name="48" href="#48">48</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">class</strong> H64 { |
| <a name="49" href="#49">49</a> |
| <a name="50" href="#50">50</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">char</strong>[] itoa64 = <span class="jxr_string">"./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"</span>.toCharArray(); |
| <a name="51" href="#51">51</a> |
| <a name="52" href="#52">52</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">short</strong> toShort(byte b) { |
| <a name="53" href="#53">53</a> <strong class="jxr_keyword">return</strong> (<strong class="jxr_keyword">short</strong>) (b & 0xff); |
| <a name="54" href="#54">54</a> } |
| <a name="55" href="#55">55</a> |
| <a name="56" href="#56">56</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">int</strong> toInt(byte[] bytes, <strong class="jxr_keyword">int</strong> offset, <strong class="jxr_keyword">int</strong> numBytes) { |
| <a name="57" href="#57">57</a> <strong class="jxr_keyword">if</strong> (numBytes < 1 || numBytes > 4) { |
| <a name="58" href="#58">58</a> <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> IllegalArgumentException(<span class="jxr_string">"numBytes must be between 1 and 4."</span>); |
| <a name="59" href="#59">59</a> } |
| <a name="60" href="#60">60</a> <strong class="jxr_keyword">int</strong> val = toShort(bytes[offset]); <em class="jxr_comment">//1st byte</em> |
| <a name="61" href="#61">61</a> <strong class="jxr_keyword">for</strong> (<strong class="jxr_keyword">int</strong> i = 1; i < numBytes; i++) { <em class="jxr_comment">//any remaining bytes:</em> |
| <a name="62" href="#62">62</a> <strong class="jxr_keyword">short</strong> s = toShort(bytes[offset + i]); |
| <a name="63" href="#63">63</a> <strong class="jxr_keyword">switch</strong> (i) { |
| <a name="64" href="#64">64</a> <strong class="jxr_keyword">case</strong> 1: val |= s << 8; <strong class="jxr_keyword">break</strong>; |
| <a name="65" href="#65">65</a> <strong class="jxr_keyword">case</strong> 2: val |= s << 16; <strong class="jxr_keyword">break</strong>; |
| <a name="66" href="#66">66</a> <strong class="jxr_keyword">case</strong> 3: val |= s << 24; <strong class="jxr_keyword">break</strong>; |
| <a name="67" href="#67">67</a> } |
| <a name="68" href="#68">68</a> } |
| <a name="69" href="#69">69</a> <strong class="jxr_keyword">return</strong> val; |
| <a name="70" href="#70">70</a> } |
| <a name="71" href="#71">71</a> |
| <a name="72" href="#72">72</a> <em class="jxr_javadoccomment">/**</em> |
| <a name="73" href="#73">73</a> <em class="jxr_javadoccomment"> * Appends the specified character into the buffer, rethrowing any encountered</em> |
| <a name="74" href="#74">74</a> <em class="jxr_javadoccomment"> * {@link IOException} as an {@link IllegalStateException} (since this method is used for internal</em> |
| <a name="75" href="#75">75</a> <em class="jxr_javadoccomment"> * implementation needs and we only ever use StringBuilders, we should never encounter an IOException).</em> |
| <a name="76" href="#76">76</a> <em class="jxr_javadoccomment"> *</em> |
| <a name="77" href="#77">77</a> <em class="jxr_javadoccomment"> * @param buf the buffer to append to</em> |
| <a name="78" href="#78">78</a> <em class="jxr_javadoccomment"> * @param c the character to append.</em> |
| <a name="79" href="#79">79</a> <em class="jxr_javadoccomment"> */</em> |
| <a name="80" href="#80">80</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">void</strong> append(Appendable buf, <strong class="jxr_keyword">char</strong> c) { |
| <a name="81" href="#81">81</a> <strong class="jxr_keyword">try</strong> { |
| <a name="82" href="#82">82</a> buf.append(c); |
| <a name="83" href="#83">83</a> } <strong class="jxr_keyword">catch</strong> (IOException e) { |
| <a name="84" href="#84">84</a> <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> IllegalStateException(<span class="jxr_string">"Unable to append character to internal buffer."</span>, e); |
| <a name="85" href="#85">85</a> } |
| <a name="86" href="#86">86</a> } |
| <a name="87" href="#87">87</a> |
| <a name="88" href="#88">88</a> <em class="jxr_javadoccomment">/**</em> |
| <a name="89" href="#89">89</a> <em class="jxr_javadoccomment"> * Encodes the specified integer to {@code numChars} H64-compatible characters and appends them into {@code buf}.</em> |
| <a name="90" href="#90">90</a> <em class="jxr_javadoccomment"> *</em> |
| <a name="91" href="#91">91</a> <em class="jxr_javadoccomment"> * @param value the integer to encode to H64-compatible characters</em> |
| <a name="92" href="#92">92</a> <em class="jxr_javadoccomment"> * @param buf the output buffer</em> |
| <a name="93" href="#93">93</a> <em class="jxr_javadoccomment"> * @param numChars the number of characters the value should be converted to. 3, 2 or 1.</em> |
| <a name="94" href="#94">94</a> <em class="jxr_javadoccomment"> */</em> |
| <a name="95" href="#95">95</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">void</strong> encodeAndAppend(<strong class="jxr_keyword">int</strong> value, Appendable buf, <strong class="jxr_keyword">int</strong> numChars) { |
| <a name="96" href="#96">96</a> <strong class="jxr_keyword">for</strong> (<strong class="jxr_keyword">int</strong> i = 0; i < numChars; i++) { |
| <a name="97" href="#97">97</a> append(buf, itoa64[value & 0x3f]); |
| <a name="98" href="#98">98</a> value >>= 6; |
| <a name="99" href="#99">99</a> } |
| <a name="100" href="#100">100</a> } |
| <a name="101" href="#101">101</a> |
| <a name="102" href="#102">102</a> <em class="jxr_javadoccomment">/**</em> |
| <a name="103" href="#103">103</a> <em class="jxr_javadoccomment"> * Encodes the specified bytes to an {@code H64}-encoded String.</em> |
| <a name="104" href="#104">104</a> <em class="jxr_javadoccomment"> *</em> |
| <a name="105" href="#105">105</a> <em class="jxr_javadoccomment"> * @param bytes</em> |
| <a name="106" href="#106">106</a> <em class="jxr_javadoccomment"> * @return</em> |
| <a name="107" href="#107">107</a> <em class="jxr_javadoccomment"> */</em> |
| <a name="108" href="#108">108</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> String encodeToString(byte[] bytes) { |
| <a name="109" href="#109">109</a> <strong class="jxr_keyword">if</strong> (bytes == <strong class="jxr_keyword">null</strong> || bytes.length == 0) <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">null</strong>; |
| <a name="110" href="#110">110</a> |
| <a name="111" href="#111">111</a> StringBuilder buf = <strong class="jxr_keyword">new</strong> StringBuilder(); |
| <a name="112" href="#112">112</a> |
| <a name="113" href="#113">113</a> <strong class="jxr_keyword">int</strong> length = bytes.length; |
| <a name="114" href="#114">114</a> <strong class="jxr_keyword">int</strong> remainder = length % 3; |
| <a name="115" href="#115">115</a> <strong class="jxr_keyword">int</strong> i = 0; <em class="jxr_comment">//starting byte</em> |
| <a name="116" href="#116">116</a> <strong class="jxr_keyword">int</strong> last3ByteIndex = length - remainder; <em class="jxr_comment">//last byte whose index is a multiple of 3</em> |
| <a name="117" href="#117">117</a> |
| <a name="118" href="#118">118</a> <strong class="jxr_keyword">for</strong>(; i < last3ByteIndex; i += 3) { |
| <a name="119" href="#119">119</a> <strong class="jxr_keyword">int</strong> twentyFourBit = toInt(bytes, i, 3); |
| <a name="120" href="#120">120</a> encodeAndAppend(twentyFourBit, buf, 4); |
| <a name="121" href="#121">121</a> } |
| <a name="122" href="#122">122</a> <strong class="jxr_keyword">if</strong> (remainder > 0) { |
| <a name="123" href="#123">123</a> <em class="jxr_comment">//one or two bytes that we still need to encode:</em> |
| <a name="124" href="#124">124</a> <strong class="jxr_keyword">int</strong> a = toInt(bytes, i, remainder); |
| <a name="125" href="#125">125</a> encodeAndAppend(a, buf, remainder + 1); |
| <a name="126" href="#126">126</a> } |
| <a name="127" href="#127">127</a> <strong class="jxr_keyword">return</strong> buf.toString(); |
| <a name="128" href="#128">128</a> } |
| <a name="129" href="#129">129</a> } |
| </pre> |
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