des.java

3DES加密Demo!!!!!!!!!!!!!!!!!!

package com.chinadim.msginterface.secretUtil;

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;

public class Des {

	private static final String Algorithm = "DESede";

	public  byte[] encryptMode(byte[] keybyte, byte[] src) {
		try {

			SecretKey deskey = new SecretKeySpec(keybyte, Algorithm);

			Cipher c1 = Cipher.getInstance(Algorithm);
			c1.init(Cipher.ENCRYPT_MODE, deskey);
			return c1.doFinal(src);
		} catch (java.security.NoSuchAlgorithmException e1) {
			e1.printStackTrace();
		} catch (javax.crypto.NoSuchPaddingException e2) {
			e2.printStackTrace();
		} catch (java.lang.Exception e3) {
			e3.printStackTrace();
		}
		return null;
	}

	public  byte[] decryptMode(byte[] keybyte, byte[] src) {
		try {

			SecretKey deskey = new SecretKeySpec(keybyte, Algorithm);

			Cipher c1 = Cipher.getInstance(Algorithm);
			c1.init(Cipher.DECRYPT_MODE, deskey);
			return c1.doFinal(src);
		} catch (java.security.NoSuchAlgorithmException e1) {
			e1.printStackTrace();
		} catch (javax.crypto.NoSuchPaddingException e2) {
			e2.printStackTrace();
		} catch (java.lang.Exception e3) {
			e3.printStackTrace();
		}
		return null;
	}

	public  String byte2hex(byte[] b) {
		String hs = "";
		String stmp = "";
		for (int i = 0; i < b.length; i++) {
			stmp = Integer.toHexString(b[i] & 0xFF);
			if (stmp.length() == 1) {
				hs += "0" + stmp;
			} else {
				hs += stmp;
			}
		}
		return hs.toUpperCase();
	}

	public  byte[] hex2byte(String hex) throws IllegalArgumentException {
		if (hex.length() % 2 != 0) {
			throw new IllegalArgumentException();
		}
		char[] arr = hex.toCharArray();
		byte[] b = new byte[hex.length() / 2];
		for (int i = 0, j = 0, l = hex.length(); i < l; i++, j++) {
			String swap = "" + arr[i++] + arr[i];
			int byteint = Integer.parseInt(swap, 16) & 0xFF;
			b[j] = new Integer(byteint).byteValue();
		}
		return b;
	}
}