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<li>为了使C端与java端的3des加解密互通，我们一般使用<strong>“DESede/ECB/NoPadding”</strong>加密模式；</li> <li>而在我们java端，我们都知道3des的密钥都是24字节的，而C端是16字节，此处为重点：<strong>我们java端的密钥组成为16字节密钥 + 其前8个字节组成24字节密钥</strong>；</li> <li>请看代码：</li> </ol>
<pre class="prettyprint" name="code"><code class="hljs cs has-numbering" onclick="mdcp.copyCode(event)" style="position: unset;"><span class="hljs-keyword">private</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">byte</span>\[\] <span class="hljs-title">fillTo24</span>(<span class="hljs-keyword">byte</span>\[\] key) { <span class="hljs-keyword">if</span> (<span class="hljs-keyword">null</span> != key && key.length == <span class="hljs-number">16</span>) { <span class="hljs-keyword">return</span> Util.pinJie2(key, Util.subBytes(key, <span class="hljs-number">0</span>, <span class="hljs-number">8</span>)); } <span class="hljs-keyword">return</span> <span class="hljs-keyword">null</span>; }<div class="hljs-button {2}" data-title="复制"></div></code><ul class="pre-numbering" style=""><li style="color: rgb(153, 153, 153);">1</li><li style="color: rgb(153, 153, 153);">2</li><li style="color: rgb(153, 153, 153);">3</li><li style="color: rgb(153, 153, 153);">4</li><li style="color: rgb(153, 153, 153);">5</li><li style="color: rgb(153, 153, 153);">6</li></ul></pre>
<ol> <li>全部代码为：</li> </ol>
<pre class="prettyprint" name="code"><code class="hljs java has-numbering" onclick="mdcp.copyCode(event)" style="position: unset;"><span class="hljs-keyword">public</span> <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">DES3Utils</span> {</span> <span class="hljs-comment">// 向量</span> <span class="hljs-keyword">public</span> <span class="hljs-keyword">final</span> <span class="hljs-keyword">static</span> String iv = <span class="hljs-string">"12345678"</span>; <span class="hljs-comment">// 3des加密</span> <span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">final</span> String algorithm = <span class="hljs-string">"DESede"</span>; <span class="hljs-comment">// 加密 src为源数据的字节数组</span> <span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">byte</span>\[\] <span class="hljs-title">encryptBy3DES</span>(<span class="hljs-keyword">byte</span>\[\] src, <span class="hljs-keyword">byte</span>\[\] key) { <span class="hljs-keyword">return</span> init(src, key, <span class="hljs-keyword">true</span>, <span class="hljs-number">0</span>); } <span class="hljs-comment">// 解密函数</span> <span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">byte</span>\[\] <span class="hljs-title">decryptBy3DES</span>(<span class="hljs-keyword">byte</span>\[\] src, <span class="hljs-keyword">byte</span>\[\] key) { <span class="hljs-keyword">return</span> init(src, key, <span class="hljs-keyword">false</span>, <span class="hljs-number">0</span>); } <span class="hljs-javadoc">/\*\* \*<span class="hljs-javadoctag"> @param</span> src 需要加密的文字 \*<span class="hljs-javadoctag"> @return</span> 加密后的文字 \*<span class="hljs-javadoctag"> @throws</span> Exception 加密失败 \*/</span> <span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">byte</span>\[\] <span class="hljs-title">encryptBy3DESCBC</span>(<span class="hljs-keyword">byte</span>\[\] src, <span class="hljs-keyword">byte</span>\[\] key) { <span class="hljs-keyword">byte</span>\[\] fillTo24 = fillTo24(key); <span class="hljs-keyword">if</span> (<span class="hljs-keyword">null</span> == fillTo24) <span class="hljs-keyword">return</span> <span class="hljs-keyword">null</span>; <span class="hljs-keyword">try</span> { SecretKey deskey = <span class="hljs-keyword">new</span> SecretKeySpec(fillTo24, algorithm); Cipher cipher = Cipher.getInstance(<span class="hljs-string">"DESede/CBC/PKCS5Padding"</span>); IvParameterSpec ips = <span class="hljs-keyword">new</span> IvParameterSpec(iv.getBytes()); cipher.init(Cipher.ENCRYPT\_MODE, deskey, ips); <span class="hljs-keyword">return</span> cipher.doFinal(src); } <span class="hljs-keyword">catch</span> (Exception e) { e.printStackTrace(); } <span class="hljs-keyword">return</span> <span class="hljs-keyword">null</span>; } <span class="hljs-javadoc">/\*\* \* 3DES解密 \* \*<span class="hljs-javadoctag"> @param</span> encryptText 加密文本 \*<span class="hljs-javadoctag"> @return</span> \*<span class="hljs-javadoctag"> @throws</span> Exception \*/</span> <span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">byte</span>\[\] <span class="hljs-title">decryptBy3DESCBC</span>(<span class="hljs-keyword">byte</span>\[\] encryptText, <span class="hljs-keyword">byte</span>\[\] key) { <span class="hljs-keyword">byte</span>\[\] fillTo24 = fillTo24(key); <span class="hljs-keyword">if</span> (<span class="hljs-keyword">null</span> == fillTo24) <span class="hljs-keyword">return</span> <span class="hljs-keyword">null</span>; <span class="hljs-keyword">try</span> { SecretKey deskey = <span class="hljs-keyword">new</span> SecretKeySpec(fillTo24, algorithm); Cipher cipher = Cipher.getInstance(<span class="hljs-string">"DESede/CBC/PKCS5Padding"</span>); IvParameterSpec ips = <span class="hljs-keyword">new</span> IvParameterSpec(iv.getBytes()); cipher.init(Cipher.DECRYPT\_MODE, deskey, ips); <span class="hljs-keyword">return</span> cipher.doFinal(encryptText); } <span class="hljs-keyword">catch</span> (Exception e) { e.printStackTrace(); } <span class="hljs-keyword">return</span> <span class="hljs-keyword">null</span>; } <span class="hljs-javadoc">/\*\* \*<span class="hljs-javadoctag"> @param</span> src 需要加密的文字 \*<span class="hljs-javadoctag"> @return</span> 加密后的文字 \*<span class="hljs-javadoctag"> @throws</span> Exception 加密失败 \*/</span> <span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">byte</span>\[\] <span class="hljs-title">encryptBy3DESECB</span>(<span class="hljs-keyword">byte</span>\[\] src, <span class="hljs-keyword">byte</span>\[\] key) { <span class="hljs-keyword">return</span> init(src, key, <span class="hljs-keyword">true</span>, <span class="hljs-number">1</span>); } <span class="hljs-javadoc">/\*\* \* 3DES解密 \* \*<span class="hljs-javadoctag"> @param</span> encryptText 加密文本 \*<span class="hljs-javadoctag"> @return</span> \*<span class="hljs-javadoctag"> @throws</span> Exception \*/</span> <span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">byte</span>\[\] <span class="hljs-title">decryptBy3DESECB</span>(<span class="hljs-keyword">byte</span>\[\] encryptText, <span class="hljs-keyword">byte</span>\[\] key) { <span class="hljs-keyword">return</span> init(encryptText, key, <span class="hljs-keyword">false</span>, <span class="hljs-number">1</span>); } <span class="hljs-keyword">private</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">byte</span>\[\] <span class="hljs-title">init</span>(<span class="hljs-keyword">byte</span>\[\] data, <span class="hljs-keyword">byte</span>\[\] key, <span class="hljs-keyword">boolean</span> mode, <span class="hljs-keyword">int</span> type) { <span class="hljs-keyword">byte</span>\[\] fillTo24 = fillTo24(key); <span class="hljs-keyword">if</span> (<span class="hljs-keyword">null</span> == fillTo24) <span class="hljs-keyword">return</span> <span class="hljs-keyword">null</span>; String types = <span class="hljs-keyword">null</span>; <span class="hljs-keyword">try</span> { SecretKey deskey = <span class="hljs-keyword">new</span> SecretKeySpec(fillTo24, algorithm); <span class="hljs-keyword">switch</span> (type) { <span class="hljs-keyword">case</span> <span class="hljs-number">0</span>: types = <span class="hljs-string">"DESede"</span>; <span class="hljs-keyword">break</span>; <span class="hljs-keyword">case</span> <span class="hljs-number">1</span>: types = <span class="hljs-string">"DESede/ECB/NoPadding"</span>; <span class="hljs-keyword">break</span>; <span class="hljs-keyword">case</span> <span class="hljs-number">2</span>: types = <span class="hljs-string">"DESede/ECB/PKCS5Padding"</span>; <span class="hljs-keyword">break</span>; } Cipher cipher = Cipher.getInstance(types); <span class="hljs-keyword">if</span> (mode) cipher.init(Cipher.ENCRYPT\_MODE, deskey); <span class="hljs-keyword">else</span> cipher.init(Cipher.DECRYPT\_MODE, deskey); <span class="hljs-keyword">return</span> cipher.doFinal(data); } <span class="hljs-keyword">catch</span> (Exception e) { e.printStackTrace(); } <span class="hljs-keyword">return</span> <span class="hljs-keyword">null</span>; } <span class="hljs-keyword">private</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">byte</span>\[\] <span class="hljs-title">fillTo24</span>(<span class="hljs-keyword">byte</span>\[\] key) { <span class="hljs-keyword">if</span> (<span class="hljs-keyword">null</span> != key && key.length == <span class="hljs-number">16</span>) { <span class="hljs-keyword">return</span> Util.pinJie2(key, Util.subBytes(key, <span class="hljs-number">0</span>, <span class="hljs-number">8</span>)); } <span class="hljs-keyword">return</span> <span class="hljs-keyword">null</span>; } }<div class="hljs-button {2}" data-title="复制"></div></code><ul class="pre-numbering" style=""><li style="color: rgb(153, 153, 153);">1</li><li style="color: rgb(153, 153, 153);">2</li><li style="color: rgb(153, 153, 153);">3</li><li style="color: rgb(153, 153, 153);">4</li><li style="color: rgb(153, 153, 153);">5</li><li style="color: rgb(153, 153, 153);">6</li><li style="color: rgb(153, 153, 153);">7</li><li style="color: rgb(153, 153, 153);">8</li><li style="color: rgb(153, 153, 153);">9</li><li style="color: rgb(153, 153, 153);">10</li><li style="color: rgb(153, 153, 153);">11</li><li style="color: rgb(153, 153, 153);">12</li><li style="color: rgb(153, 153, 153);">13</li><li style="color: rgb(153, 153, 153);">14</li><li style="color: rgb(153, 153, 153);">15</li><li style="color: rgb(153, 153, 153);">16</li><li style="color: rgb(153, 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