Крейн Д., Паскарелло Э., Джеймс Д,. AJAX в действии / Ajax в действии / Исходники примеров / ajaxinactioncode_03nov2005 / ch11 / server_src / src / com / manning / ajaxinaction / security / Encrypter

package com.manning.ajaxinaction.security;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

import org.apache.commons.codec.binary.Base64;

/**
* class for encrypting private-public key pairs using MD5
*
* @author dave
*/
public class Encrypter {

private String pubKey=null;
private String privKey=null;
private MessageDigest digest=null;

/**
* @param pubKey
* @param privKey
* @throws NoSuchAlgorithmException
*/
public Encrypter(String pubKey, String privKey) throws NoSuchAlgorithmException {
super();
this.pubKey = pubKey;
this.privKey = privKey;
digest=MessageDigest.getInstance("MD5");
}

public String getEncryptedValue(){
byte[] data=privKey.getBytes();
digest.update(data);
byte[] raw=digest.digest(pubKey.getBytes());
byte[] b64=Base64.encodeBase64(raw);
return new String(b64);
}

public boolean compare(String string){
return string.equals(getEncryptedValue());
}
/**
* @return Returns the pubKey.
*/
public String getPubKey() {
return pubKey;
}

}