java加密技术DES和Base64实例

1、实例

import sun.misc.BASE64Decoder;import sun.misc.BASE64Encoder;import javax.crypto.Cipher;import javax.crypto.SecretKey;import javax.crypto.SecretKeyFactory;import javax.crypto.spec.DESKeySpec;import java.security.SecureRandom;public class DESCoder {    public static final String ALGORITHM = "DES";    /**     * DES解密     */    public static byte[] decrypt(byte[] data, String key) throws Exception {        try{        SecureRandom random = new SecureRandom();        DESKeySpec desKey = new DESKeySpec(key.getBytes());        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(ALGORITHM);        SecretKey securekey = keyFactory.generateSecret(desKey);        Cipher cipher = Cipher.getInstance(ALGORITHM);        // 用密匙初始化Cipher对象        cipher.init(Cipher.DECRYPT_MODE, securekey, random);        // 真正开始解密操作        return cipher.doFinal(data);        }catch(Throwable e){            e.printStackTrace();        }        return null;    }    /**     * DES加密     */    public static byte[] encrypt(byte[] data, String key) throws Exception {        try{            SecureRandom random = new SecureRandom();            DESKeySpec desKey = new DESKeySpec(key.getBytes());            SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(ALGORITHM);            SecretKey securekey = keyFactory.generateSecret(desKey);            Cipher cipher = Cipher.getInstance(ALGORITHM);            //用密匙初始化Cipher对象            cipher.init(Cipher.ENCRYPT_MODE, securekey, random);            //现在，获取数据并加密            //正式执行加密操作            return cipher.doFinal(data);        }catch(Throwable e){            e.printStackTrace();        }        return null;    }    /**     * 利用Base64对生成秘钥     */    public static String initKey(String seed) throws Exception {        String initKey = null;        if (seed != null) {            initKey = encryptBASE64(seed.getBytes());;        } else {            initKey = encryptBASE64("abc123".getBytes());        }        return initKey;    }    /**     * BASE64解密     */    public static byte[] decryptBASE64(String key) throws Exception {        return (new BASE64Decoder()).decodeBuffer(key);    }    /**     * BASE64加密     */    public static String encryptBASE64(byte[] key) throws Exception {        return (new BASE64Encoder()).encodeBuffer(key);    }}/** * 测试类 */import org.junit.Test;public class DESCoderTest {    @Test    public void test() throws Exception {        //String inputStr = "卖家代充123abc";        String inputStr = "鄢间";        System.err.println("原文:\t" + inputStr);        //生成秘钥        String key = DESCoder.initKey("abc123");        System.err.println("密钥:\t" + key);        //加密        byte[] inputData = inputStr.getBytes();        inputData = DESCoder.encrypt(inputData, key);        System.err.println("加密后:\t" + inputData);        //解密        byte[] outputData = DESCoder.decrypt(inputData, key);        String outputStr = new String(outputData);        System.err.println("解密后:\t" + outputStr);        //验证        Boolean isEquals = assertEquals(inputStr, outputStr);        System.out.println(isEquals);    }    public Boolean assertEquals(String inPut, String outPut){        if(inPut.equals(outPut)){            return true;        }        return false;    }}