Md5加密算法代码,Java代码库,德仔网

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【Java】 Md5加密算法
作者: / 发布于2011/1/14/ 848
<div><span style="color: #008000">/**</span><span style="color: #008000">
* The Class Md5.
</span><span style="color: #008000">*/</span><span style="color: #000000">
</span><span style="color: #0000ff">public</span><span style="color: #000000"> </span><span style="color: #0000ff">class</span><span style="color: #000000"> Md5 {
 
 </span><span style="color: #008000">/**</span><span style="color: #008000">
 * 32位加密算法.
 * 
 * </span><span style="color: #808080">@param</span><span style="color: #008000"> plainText the plain text
 * 
 * </span><span style="color: #808080">@return</span><span style="color: #008000"> the string
 </span><span style="color: #008000">*/</span><span style="color: #000000">
 </span><span style="color: #0000ff">public</span><span style="color: #000000"> </span><span style="color: #0000ff">static</span><span style="color: #000000"> String make32(String plainText) {
 </span><span style="color: #0000ff">try</span><span style="color: #000000"> {
 MessageDigest md </span><span style="color: #000000">=</span><span style="color: #000000"> MessageDigest.getInstance(</span><span style="color: #000000">"</span><span style="color: #000000">MD5</span><span style="color: #000000">"</span><span style="color: #000000">);
 md.update(plainText.getBytes());
 </span><span style="color: #0000ff">byte</span><span style="color: #000000"> b[] </span><span style="color: #000000">=</span><span style="color: #000000"> md.digest();
 </span><span style="color: #0000ff">int</span><span style="color: #000000"> i;
 StringBuffer buf </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #0000ff">new</span><span style="color: #000000"> StringBuffer(</span><span style="color: #000000">""</span><span style="color: #000000">);
 </span><span style="color: #0000ff">for</span><span style="color: #000000"> (</span><span style="color: #0000ff">int</span><span style="color: #000000"> offset </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #000000">0</span><span style="color: #000000">; offset </span><span style="color: #000000"><</span><span style="color: #000000"> b.length; offset</span><span style="color: #000000">++</span><span style="color: #000000">) {
 i </span><span style="color: #000000">=</span><span style="color: #000000"> b[offset];
 </span><span style="color: #0000ff">if</span><span style="color: #000000"> (i </span><span style="color: #000000"><</span><span style="color: #000000"> </span><span style="color: #000000">0</span><span style="color: #000000">)
 i </span><span style="color: #000000">+=</span><span style="color: #000000"> </span><span style="color: #000000">256</span><span style="color: #000000">;
 </span><span style="color: #0000ff">if</span><span style="color: #000000"> (i </span><span style="color: #000000"><</span><span style="color: #000000"> </span><span style="color: #000000">16</span><span style="color: #000000">)
 buf.append(</span><span style="color: #000000">"</span><span style="color: #000000">0</span><span style="color: #000000">"</span><span style="color: #000000">);
 buf.append(Integer.toHexString(i));
 }
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> buf.toString();
 } </span><span style="color: #0000ff">catch</span><span style="color: #000000"> (NoSuchAlgorithmException e) {
 e.printStackTrace();
 }
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> </span><span style="color: #0000ff">null</span><span style="color: #000000">;
 }
 
 </span><span style="color: #008000">/**</span><span style="color: #008000">
 * 16位加密算法.
 * 
 * </span><span style="color: #808080">@param</span><span style="color: #008000"> plainText the plain text
 * 
 * </span><span style="color: #808080">@return</span><span style="color: #008000"> the string
 </span><span style="color: #008000">*/</span><span style="color: #000000">
 </span><span style="color: #0000ff">public</span><span style="color: #000000"> </span><span style="color: #0000ff">static</span><span style="color: #000000"> String make16(String plainText) {
 </span><span style="color: #0000ff">try</span><span style="color: #000000"> {
 MessageDigest md </span><span style="color: #000000">=</span><span style="color: #000000"> MessageDigest.getInstance(</span><span style="color: #000000">"</span><span style="color: #000000">MD5</span><span style="color: #000000">"</span><span style="color: #000000">);
 md.update(plainText.getBytes());
 </span><span style="color: #0000ff">byte</span><span style="color: #000000"> b[] </span><span style="color: #000000">=</span><span style="color: #000000"> md.digest();
 </span><span style="color: #0000ff">int</span><span style="color: #000000"> i;
 StringBuffer buf </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #0000ff">new</span><span style="color: #000000"> StringBuffer(</span><span style="color: #000000">""</span><span style="color: #000000">);
 </span><span style="color: #0000ff">for</span><span style="color: #000000"> (</span><span style="color: #0000ff">int</span><span style="color: #000000"> offset </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #000000">0</span><span style="color: #000000">; offset </span><span style="color: #000000"><</span><span style="color: #000000"> b.length; offset</span><span style="color: #000000">++</span><span style="color: #000000">) {
 i </span><span style="color: #000000">=</span><span style="color: #000000"> b[offset];
 </span><span style="color: #0000ff">if</span><span style="color: #000000"> (i </span><span style="color: #000000"><</span><span style="color: #000000"> </span><span style="color: #000000">0</span><span style="color: #000000">)
 i </span><span style="color: #000000">+=</span><span style="color: #000000"> </span><span style="color: #000000">256</span><span style="color: #000000">;
 </span><span style="color: #0000ff">if</span><span style="color: #000000"> (i </span><span style="color: #000000"><</span><span style="color: #000000"> </span><span style="color: #000000">16</span><span style="color: #000000">)
 buf.append(</span><span style="color: #000000">"</span><span style="color: #000000">0</span><span style="color: #000000">"</span><span style="color: #000000">);
 buf.append(Integer.toHexString(i));
 }
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> buf.toString().substring(</span><span style="color: #000000">8</span><span style="color: #000000">, </span><span style="color: #000000">24</span><span style="color: #000000">);
 } </span><span style="color: #0000ff">catch</span><span style="color: #000000"> (NoSuchAlgorithmException e) {
 e.printStackTrace();
 }
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> </span><span style="color: #0000ff">null</span><span style="color: #000000">;
 }
 
 </span><span style="color: #008000">/**</span><span style="color: #008000">
 * The main method.
 * 
 * </span><span style="color: #808080">@param</span><span style="color: #008000"> agrs the arguments
 </span><span style="color: #008000">*/</span><span style="color: #000000">
 </span><span style="color: #0000ff">public</span><span style="color: #000000"> </span><span style="color: #0000ff">static</span><span style="color: #000000"> </span><span style="color: #0000ff">void</span><span style="color: #000000"> main(String agrs[]) {
 System.out.println(Md5.make32(</span><span style="color: #000000">"</span><span style="color: #000000">1</span><span style="color: #000000">"</span><span style="color: #000000">));</span><span style="color: #008000">//</span><span style="color: #008000"> 加密4</span><span style="color: #008000">
</span><span style="color: #000000"> System.out.println(Md5.make16(</span><span style="color: #000000">"</span><span style="color: #000000">1</span><span style="color: #000000">"</span><span style="color: #000000">));

 }

}</span>
</div>
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