ThreeDES.java

package thirdparty.threedes;

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESedeKeySpec;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * 3DES加密方法
 * 
 */
public class ThreeDES {

	private static final Logger logger = LoggerFactory.getLogger(ThreeDES.class);

	private static final String key = "qwejda!@#dasd235412faced";

	/**
	 * 加密
	 * 
	 * @param plainByte 明文
	 *
	 * @return 密文
	 */
	public byte[] encrypt(byte[] plainByte) {

		byte[] cipherByte = null;
		try {
			DESedeKeySpec dks = new DESedeKeySpec(key.getBytes("UTF-8"));
			SecretKeyFactory keyFactory = SecretKeyFactory
					.getInstance("DESede");
			SecretKey securekey = keyFactory.generateSecret(dks);

			Cipher cipher = Cipher.getInstance("DESede/ECB/PKCS5Padding");
			cipher.init(Cipher.ENCRYPT_MODE, securekey);
			cipherByte = cipher.doFinal(plainByte);
		} catch (Exception e) {
			logger.error(e.getMessage(), e);
		}
		return cipherByte;
	}

	/**
	 * 解密
	 * 
	 * @param cipherByte 密文
	 *
	 * @return 明文
	 */
	public byte[] decrypt(byte[] cipherByte) {

		byte[] decryptByte = null;
		try {
			DESedeKeySpec dks = new DESedeKeySpec(key.getBytes("UTF-8"));
			SecretKeyFactory keyFactory = SecretKeyFactory
					.getInstance("DESede");
			SecretKey securekey = keyFactory.generateSecret(dks);

			Cipher cipher = Cipher.getInstance("DESede/ECB/PKCS5Padding");
			cipher.init(Cipher.DECRYPT_MODE, securekey);
			decryptByte = cipher.doFinal(cipherByte);
		} catch (Exception e) {
			logger.error(e.getMessage(), e);
		}

		return decryptByte;
	}



	public static void main(String[] args) throws Exception {
		byte[] b1={1,2,3};

		ThreeDES method = new ThreeDES();
		System.out.println("原始数据[" + b1.length + "]：");
		for(byte b : b1)
			System.out.print(b + " ");
		System.out.println();

		byte[] encode = method.encrypt(b1);

		System.out.println("加密数据[" + encode.length + "]：");
		for(byte b : encode)
			System.out.print(b + " ");
		System.out.println();

		byte[] decode = method.decrypt(encode);

		System.out.println("解密数据[" + decode.length+ "]：" );
		for(byte b : decode)
			System.out.print(b + " ");
		System.out.println();

	}

}