desgo.java

des 算法的java简单实现 欢迎大家下载

package des;

import java.security.*;
import javax.crypto.*;

public class desgo {
	public static void main(String[] args) {
		desgo my = new desgo();
		my.run();
	}

	public void run() {
		// 添加新安全算法,如果用JCE就要把它添加进去
		Security.addProvider(new com.sun.crypto.provider.SunJCE());
		String Algorithm = "DES"; // 定义 加密算法,可用 DES,DESede,Blowfish
		String myinfo = "要加密的信息";
		try {
			// 生成密钥
			KeyGenerator keygen = KeyGenerator.getInstance(Algorithm);
			SecretKey deskey = keygen.generateKey();

			// 加密
			System.out.println("加密前的二进串:" + byte2hex(myinfo.getBytes()));
			System.out.println("加密前的信息:" + myinfo);
			Cipher c1 = Cipher.getInstance(Algorithm);
			c1.init(Cipher.ENCRYPT_MODE, deskey);
			byte[] cipherByte = c1.doFinal(myinfo.getBytes());
			System.out.println("加密后的二进串:" + byte2hex(cipherByte));
			// 解密
			c1 = Cipher.getInstance(Algorithm);
			c1.init(Cipher.DECRYPT_MODE, deskey);
			byte[] clearByte = c1.doFinal(cipherByte);
			System.out.println("解密后的二进串:" + byte2hex(clearByte));
			System.out.println("解密后的信息:" + (new String(clearByte)));

		} catch (java.security.NoSuchAlgorithmException e1) {
			e1.printStackTrace();
		} catch (javax.crypto.NoSuchPaddingException e2) {
			e2.printStackTrace();
		} catch (java.lang.Exception e3) {
			e3.printStackTrace();
		}
	}

	public String byte2hex(byte[] b) // 二行制转字符串
	{
		String hs = "";
		String stmp = "";
		for (int n = 0; n < b.length; n++) {
			stmp = (java.lang.Integer.toHexString(b[n] & 0XFF));
			if (stmp.length() == 1)
				hs = hs + "0" + stmp;
			else
				hs = hs + stmp;
			if (n < b.length - 1)
				hs = hs + ":";
		}
		return hs.toUpperCase();
	}

}