PasswordManager--从AES看到的有用代码片段

import java.security.MessageDigest;

import java.security.NoSuchAlgorithmException;

public class PasswordManager {

// ***************************************************************

// Public Interface

// ***************************************************************

/**

* Creates a one-way has of the specified password. This allows passwords to be

* safely stored in the database without any way to retrieve the original value.

* @param password the string to encrypt.

* @return the encrypted password, or null if encryption failed.

public static String encryptPassword( String password ) {

try {

MessageDigest md = MessageDigest.getInstance( " SHA " );

// Create the encrypted Byte[]

md.update( password.getBytes() );

byte [] hash = md.digest();

// Convert the byte array into a String

StringBuffer hashStringBuf = new StringBuffer();

String byteString;

int byteLength;

for ( int index = 0 ; index < hash.length; index ++ ) {

byteString = String.valueOf( hash[index ] + 128 );

// Pad string to 3. Otherwise hash may not be unique.

byteLength = byteString.length();

switch ( byteLength ) {

case 1 :

byteString = " 00 " + byteString;

break ;

case 2 :

byteString = " 0 " + byteString;

break ;

}

hashStringBuf.append( byteString );

}

return hashStringBuf.toString();

}

catch ( NoSuchAlgorithmException nsae ) {

System.out.println( " Error getting password hash - " + nsae.getMessage() );

return null ;

}

posted on 2006-03-28 15:45 java小记阅读(273) 评论(0) 编辑收藏

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