java的des加密

工作中用到的,希望对大家有帮助.

import java.security.Key; import java.security.spec.AlgorithmParameterSpec; import javax.crypto.Cipher; import javax.crypto.SecretKeyFactory; import javax.crypto.spec.DESKeySpec; import javax.crypto.spec.IvParameterSpec; import sun.misc.BASE64Decoder; import sun.misc.BASE64Encoder; public class CryptoTools { private static final String key_ = "ising@ws"; // private static final byte [] DESkey = key_.getBytes();//设置密钥，略去 private static final byte[] DESIV = { (byte)0x12,(byte) 0x34, (byte)0x56, (byte)0x78, (byte)0x90, (byte)0xAB, (byte)0xCD,(byte) 0xEF };//设置向量，略去 private static AlgorithmParameterSpec iv =null;//加密算法的参数接口，IvParameterSpec是它的一个实现 private static Key key =null; public CryptoTools() throws Exception { DESKeySpec keySpec = new DESKeySpec(DESkey);//设置密钥参数 iv = new IvParameterSpec(DESIV);//设置向量 SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");//获得密钥工厂 key = keyFactory.generateSecret(keySpec);//得到密钥对象 } public String encode(String data) throws Exception { Cipher enCipher = Cipher.getInstance("DES/CBC/PKCS5Padding");//得到加密对象Cipher enCipher.init(Cipher.ENCRYPT_MODE,key,iv);//设置工作模式为加密模式，给出密钥和向量 byte[] pasByte = enCipher.doFinal(data.getBytes("utf-8")); BASE64Encoder base64Encoder = new BASE64Encoder(); return base64Encoder.encode(pasByte); } public String decode(String data) throws Exception{ Cipher deCipher = Cipher.getInstance("DES/CBC/PKCS5Padding"); deCipher.init(Cipher.DECRYPT_MODE,key,iv); BASE64Decoder base64Decoder = new BASE64Decoder(); byte[] pasByte=deCipher.doFinal(base64Decoder.decodeBuffer(data)); return new String(pasByte,"UTF-8"); } public static void main(String[] args) throws Exception{ String value = "hello"; CryptoTools tools =new CryptoTools(); System.out.println(tools.encode(value)); System.out.println("解密"+tools.decode(tools.encode(value))); } } }

修改后的:

public String encode(String data) throws Exception { byte [] DESkey = key_.getBytes(); byte[] DESIV = { (byte)0x12,(byte) 0x34, (byte)0x56, (byte)0x78, (byte)0x90,(byte)0xAB, (byte)0xCD,(byte) 0xEF }; DESKeySpec keySpec = new DESKeySpec(DESkey); iv = new IvParameterSpec(DESIV); SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES"); key = keyFactory.generateSecret(keySpec); SecureRandom sr = new SecureRandom(); Cipher enCipher = Cipher.getInstance("DES"); enCipher.init(Cipher.ENCRYPT_MODE, key,sr); byte[] pasByte = enCipher.doFinal(data.getBytes("utf-8")); BASE64Encoder base64Encoder = new BASE64Encoder(); return base64Encoder.encode(pasByte); }

2009-04-30