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import java.security.NoSuchAlgorithmException;
public class MD5HashUtil
{
private MessageDigest md = null ;
private static MD5HashUtil md5 = null ;
private static final char [] hexChars ={ '0' , '1' , '2' , '3' , '4' , '5' , '6' , '7' , '8' , '9' , 'A' , 'B' , 'C' , 'D' , 'E' , 'F' };
/**
* Constructor is private so you must use the getInstance method
*/
private MD5HashUtil() throws NoSuchAlgorithmException
{
md = MessageDigest.getInstance( "MD5" );
}
/**
* This returns the singleton instance
*/
public static MD5HashUtil getInstance() throws NoSuchAlgorithmException
{
if (md5 == null )
{
md5 = new MD5HashUtil();
}
return (md5);
}
public static String hashCode(String dataToHash) throws NoSuchAlgorithmException{
return getInstance().hashData(dataToHash.getBytes());
}
public static String hashCode( byte [] dataToHash) throws NoSuchAlgorithmException{
return getInstance().hashData(dataToHash);
}
public String hashData( byte [] dataToHash) {
return hexStringFromBytes((calculateHash(dataToHash))).toLowerCase();
}
private byte [] calculateHash( byte [] dataToHash)
{
md.update(dataToHash, 0 , dataToHash.length);
return (md.digest());
}
public String hexStringFromBytes( byte [] b)
{
String hex = "" ;
int msb;
int lsb = 0 ;
int i;
// MSB maps to idx 0
for (i = 0 ; i < b.length; i++)
{
msb = (( int )b[i] & 0x000000FF ) / 16 ;
lsb = (( int )b[i] & 0x000000FF ) % 16 ;
hex = hex + hexChars[msb] + hexChars[lsb];
}
return (hex);
}
public static void main(String args[]) throws NoSuchAlgorithmException
{
String string = "my name is zhangli" ;
System.out.println(string);
System.out.println(hashCode(string));
}
}
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如上代码为java语言实现md5加密算法,输出为加密后的密文!
通常将加密后的密文保存在数据库中,如果需要比较只比较他们的用md5加密过后的密文。
同时,md5加密算法是不可逆的,破解的难度很高。
以上就是java MD5加密算法的实例详解,如有疑问请留言或者到本站社区交流讨论,感谢阅读,希望能帮助到大家,谢谢大家对本站的支持!
原文链接:http://blog.csdn.net/fzhlee/article/details/5724530