altencrypter.java

是一个专门设计用于触摸屏的POS(point of sales)应用软件

/*
 * AltEncrypter.java
 *
 * Created on 23 de julio de 2006, 16:58
 *
 * To change this template, choose Tools | Template Manager
 * and open the template in the editor.
 */

package net.adrianromero.tpv.util;

import java.io.UnsupportedEncodingException;
import java.security.*;
import javax.crypto.*;

public class AltEncrypter {
    
    private Cipher cipherDecrypt;
    private Cipher cipherEncrypt;
    
    /** Creates a new instance of Encrypter */
    public AltEncrypter(String passPhrase) {
        
        try {
            SecureRandom sr = SecureRandom.getInstance("SHA1PRNG");
            sr.setSeed(passPhrase.getBytes("UTF8"));
            KeyGenerator kGen = KeyGenerator.getInstance("DESEDE");
            kGen.init(168, sr);
            Key key = kGen.generateKey();

            cipherEncrypt = Cipher.getInstance("DESEDE/ECB/PKCS5Padding");
            cipherEncrypt.init(Cipher.ENCRYPT_MODE, key);
            
            cipherDecrypt = Cipher.getInstance("DESEDE/ECB/PKCS5Padding");
            cipherDecrypt.init(Cipher.DECRYPT_MODE, key);
        } catch (UnsupportedEncodingException e) {
        } catch (NoSuchPaddingException e) {
        } catch (NoSuchAlgorithmException e) {
        } catch (InvalidKeyException e) {
        }
    }
    
    public String encrypt(String str) {
        try {
            return StringUtils.byte2hex(cipherEncrypt.doFinal(str.getBytes("UTF8")));
        } catch (UnsupportedEncodingException e) {
        } catch (BadPaddingException e) {
        } catch (IllegalBlockSizeException e) {
        }
        return null;
    }
    
    public String decrypt(String str) {
        try {
            return new String(cipherDecrypt.doFinal(StringUtils.hex2byte(str)), "UTF8");
        } catch (UnsupportedEncodingException e) {
        } catch (BadPaddingException e) {
        } catch (IllegalBlockSizeException e) {
        }
        return null;
    }    
}