DES加密解密

DES加密解密代碼如下:

import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.security.Key;
import java.security.SecureRandom;
import java.util.Base64;

import javax.crypto.Cipher;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
public class DESUtils {

	Key key;

	public DESUtils(String str) {
		setKey(str);// 生成密匙
	}

	/**
	 * 根據參數生成KEY
	 */
	public void setKey(String strKey) {
		try {
			SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
			this.key  = keyFactory.generateSecret(new DESKeySpec(strKey.getBytes("UTF8")));
		} catch (Exception e) {
			throw new RuntimeException(
					"Error initializing SqlMap class. Cause: " + e);
		}
	}


	/**
	 * 加密String明文輸入,String密文輸出
	 */
	public String encrypt(String strMing) {
		byte[] byteMi = null;
		byte[] byteMing = null;
		String strMi = "";
		try {
			byteMing = strMing.getBytes("UTF8");
			byteMi = this.getEncCode(byteMing);
			strMi = Base64.getEncoder().encodeToString(byteMi);
		} catch (Exception e) {
			throw new RuntimeException(
					"Error initializing SqlMap class. Cause: " + e);
		} finally {
			byteMing = null;
			byteMi = null;
		}
		return strMi;
	}

	/**
	 * 解密 以String密文輸入,String明文輸出
	 * 
	 * @param strMi
	 * @return
	 */
	public String decrypt(String strMi) {
		byte[] byteMing = null;
		byte[] byteMi = null;
		String strMing = "";
		try {
			byteMi =Base64.getDecoder().decode(strMi);
			byteMing = this.getDesCode(byteMi);
			strMing = new String(byteMing, "UTF8");
		} catch (Exception e) {
			throw new RuntimeException(
					"Error initializing SqlMap class. Cause: " + e);
		} finally {
			byteMing = null;
			byteMi = null;
		}
		return strMing;
	}

	/**
	 * 加密以byte[]明文輸入,byte[]密文輸出
	 * 
	 * @param byteS
	 * @return
	 */
	private byte[] getEncCode(byte[] byteS) {
		byte[] byteFina = null;
		Cipher cipher;
		try {
			cipher = Cipher.getInstance("DES");
			cipher.init(Cipher.ENCRYPT_MODE, key,SecureRandom.getInstance("SHA1PRNG"));
			byteFina = cipher.doFinal(byteS);
		} catch (Exception e) {
			throw new RuntimeException(
					"Error initializing SqlMap class. Cause: " + e);
		} finally {
			cipher = null;
		}
		return byteFina;
	}

	/**
	 * 解密以byte[]密文輸入,以byte[]明文輸出
	 * 
	 * @param byteD
	 * @return
	 */
	private byte[] getDesCode(byte[] byteD) {
		Cipher cipher;
		byte[] byteFina = null;
		try {
			cipher = Cipher.getInstance("DES");
			cipher.init(Cipher.DECRYPT_MODE, key,SecureRandom.getInstance("SHA1PRNG"));
			byteFina = cipher.doFinal(byteD);
		} catch (Exception e) {
			throw new RuntimeException(
					"Error initializing SqlMap class. Cause: " + e);
		} finally {
			cipher = null;
		}
		return byteFina;
	}

	public static void main(String[] args) {
		DESUtils desUtils=new DESUtils("1zhxcuql");
		String s=desUtils.encrypt("chengwenlong");
		//s=desUtils.decrypt("BSHMD+DJugNr9wL+kIhUaQ==");
		try {
			System.out.println(URLEncoder.encode(s,"UTF-8"));
		} catch (UnsupportedEncodingException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
}