?? messagedigestutil.java
字號:
package org.ithinking.utils;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
//消息摘要的輔助類,提供了MD5和SHA-1兩種摘要算法
public class MessageDigestUtil {
private MessageDigest currentAlorithm=null;
public static final String MD5="MD5";
public static final String SHA1="SHA-1";
public MessageDigestUtil(String method)
{
try
{
currentAlorithm=MessageDigest.getInstance(method);
}
catch(NoSuchAlgorithmException e)
{
e.printStackTrace();
currentAlorithm=null;
}
}
public byte[] computeDigest(byte[] b)
{
if(currentAlorithm==null)
return null;
currentAlorithm.reset();
currentAlorithm.update(b);
byte[] hash=currentAlorithm.digest();
return hash;
}
public byte[] computeDigest(String s)
{
return computeDigest(s.getBytes());
}
}
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