RSA

package net.shopxx.util.ccb.sample;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.PrivateKey;
import java.security.PublicKey;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;

/**
 * 
 * @author suzh
 * 
 * 2006-8-21
 *
 * 生成密钥的方法
 */
public class GenerateKey
{

	public GenerateKey()
	{

	}

	/**
	 * 生成RSA密钥对
	 * 
	 * @param pub
	 * @param pri
	 */
	public void generRSAKey(String pub, String pri)
	{

		FileOutputStream output = null;

		try
		{
			KeyPairGenerator kpg = KeyPairGenerator.getInstance("RSA");
			// 密钥的长度
			kpg.initialize(1024);

			KeyPair kp = kpg.genKeyPair();

			PublicKey pbkey = kp.getPublic();

			PrivateKey prkey = kp.getPrivate();

			// 保存公钥

			output = new FileOutputStream(pub);

			output.write(ConvertBase64.encodeBase64(pbkey.getEncoded()));

			output.close();
			// 保存私钥
			output = new FileOutputStream(pri);

			output.write(ConvertBase64.encodeBase64(prkey.getEncoded()));

		} catch (Exception e)
		{
			e.printStackTrace();
		} finally
		{
			try
			{
				if (output != null)
				{
					output.close();
				}
			} catch (Exception e)
			{
				e.printStackTrace();
			}
		}

	}

	/**
	 * 生成对称算法的密钥对象
	 * 
	 * @param filepath
	 *            文件路径
	 * @return
	 */
	public void generSecretKey(String secret)
	{

		FileOutputStream output = null;

		try
		{
			output = new FileOutputStream(secret);

			KeyGenerator kg = KeyGenerator.getInstance("DESede");
			// 密钥的长度
			kg.init(112);

			SecretKey secretKey = kg.generateKey();

			output.write(ConvertBase64.encodeBase64(secretKey.getEncoded()));

		} catch (Exception e)
		{
			e.printStackTrace();
		}

		finally
		{
			try
			{
				if (output != null)
					output.close();
			} catch (Exception e)
			{
				e.printStackTrace();
			}
		}

	}

	/**
	 * 
	 * @param args
	 */
	public static void main(String[] args)
	{
		GenerateKey gener = new GenerateKey();
		
		//非对称密钥对
		gener.generRSAKey("D:/test/商户正式RSA/key_RSA_pub.dat","D:/test/商户正式RSA/key_RSA_priv.dat");
		FileInputStream input = null;
		try {
			input = new FileInputStream(new File("D:/test/商户正式RSA/key_RSA_pub.dat"));
			byte[] p_data = new byte[input.available()];
			input.read(p_data);
			input.close();
			System.out.println("str:"+new String(p_data));
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		//对称密钥
		gener.generSecretKey("D:/test/商户正式RSA/DES_key.dat");
	}

}