工具類二(DESUtils篇)

分享老大寫的des加密工具類，有用的拿走。

import java.security.SecureRandom;

import javax.crypto.Cipher;

import javax.crypto.SecretKey;

import javax.crypto.SecretKeyFactory;

import javax.crypto.spec.DESKeySpec;

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

public class DESUtilsTest {

private static final String DES = "DES";

private static final String PADDING = "DES/ECB/PKCS5Padding";

private static final String DEFAULT_INCODING = "utf-8";

public final static String encrypt(String code, String key) {

try{

return Base64.encodeBase64String(encrypt(code.getBytes(DEFAULT_INCODING), key.getBytes(DEFAULT_INCODING)));

}catch(Exception e) {

}

return null;

}

public static byte[] encrypt(byte[] code, byte[] key) throws Exception {

SecureRandom sr = new SecureRandom();

//生成密鑰

DESKeySpec dks = new DESKeySpec(key);

SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);

SecretKey secretKey = keyFactory.generateSecret(dks);

//進行加密

Cipher cipher = Cipher.getInstance(PADDING);

cipher.init(Cipher.ENCRYPT_MODE, secretKey, sr);

return cipher.doFinal(code);

}

public final static String decrypt(String code, String key) {

try{

return new String(decrypt(Base64.decodeBase64(code), key.getBytes(DEFAULT_INCODING)), DEFAULT_INCODING);

}catch(Exception e) {

}

return null;

}

public static byte[] decrypt(byte[] src, byte[] key) throws Exception {

SecureRandom sr = new SecureRandom();

//生成密鑰

DESKeySpec dks = new DESKeySpec(key);

SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);

SecretKey sectetKey = keyFactory.generateSecret(dks);

//進行加密

Cipher cipher = Cipher.getInstance(PADDING);

cipher.init(Cipher.DECRYPT_MODE, sectetKey, sr);

return cipher.doFinal(src);

}

}