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java 加密算法 RSA 實現代碼

package com.yill;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.ObjectInputStream;

import java.io.ObjectOutputStream;

import java.security.InvalidKeyException;

import java.security.Key;

import java.security.KeyPair;

import java.security.NoSuchAlgorithmException;

import java.security.PrivateKey;

import java.security.PublicKey;

import java.security.SecureRandom;

import javax.crypto.BadPaddingException;

import javax.crypto.Cipher;

import javax.crypto.IllegalBlockSizeException;

import javax.crypto.NoSuchPaddingException;

import sun.security.rsa.RSAKeyPairGenerator;

public class YillRSA

{

/**

* @param args

*/

public static void main(String[] args)

{

generateKeyPair();

byte[] info = "http://www.aygfsteel.com/yill/".getBytes();

System.out.println("Original info is " + new String(info));

System.out.println("encrypted info is " + new String(encode(info)));

System.out.println("Decrypted info is "

+ new String(decode(encode(info))));

}

public static void generateKeyPair()

{

RSAKeyPairGenerator kg = new RSAKeyPairGenerator();

kg.initialize(1024, new SecureRandom());

KeyPair keyPair = kg.generateKeyPair();

PrivateKey privateKey = keyPair.getPrivate();

writeKeyToDisk("C:\\privateKey.dat", privateKey);

PublicKey publicKey = keyPair.getPublic();

writeKeyToDisk("C:\\publicKey.dat", publicKey);

}

public static byte[] encode(byte[] info)

{

PrivateKey privateKey = (PrivateKey) readKeyFromDisk("C:\\privateKey.dat");

try

{

Cipher cipher = Cipher.getInstance("RSA");

cipher.init(Cipher.ENCRYPT_MODE, privateKey, new SecureRandom());

return cipher.doFinal(info);

}

catch (NoSuchAlgorithmException e)

{

// TODO Auto-generated catch block

e.printStackTrace();

}

catch (NoSuchPaddingException e)

{

// TODO Auto-generated catch block

e.printStackTrace();

}

catch (InvalidKeyException e)

{

// TODO Auto-generated catch block

e.printStackTrace();

}

catch (IllegalBlockSizeException e)

{

// TODO Auto-generated catch block

e.printStackTrace();

}

catch (BadPaddingException e)

{

// TODO Auto-generated catch block

e.printStackTrace();

}

return new byte[0];

}

public static byte[] decode(byte[] info)

{

PublicKey publicKey = (PublicKey) readKeyFromDisk("C:\\publicKey.dat");

try

{

Cipher cipher = Cipher.getInstance("RSA");

cipher.init(Cipher.DECRYPT_MODE, publicKey, new SecureRandom());

return cipher.doFinal(info);

}

catch (NoSuchAlgorithmException e)

{

// TODO Auto-generated catch block

e.printStackTrace();

}

catch (NoSuchPaddingException e)

{

// TODO Auto-generated catch block

e.printStackTrace();

}

catch (InvalidKeyException e)

{

// TODO Auto-generated catch block

e.printStackTrace();

}

catch (IllegalBlockSizeException e)

{

// TODO Auto-generated catch block

e.printStackTrace();

}

catch (BadPaddingException e)

{

// TODO Auto-generated catch block

e.printStackTrace();

}

return new byte[0];

}

private static void writeKeyToDisk(String file, Key key)

{

try

{

ObjectOutputStream out = new ObjectOutputStream(

new FileOutputStream(file));

out.writeObject(key);

}

catch (FileNotFoundException e)

{

// TODO Auto-generated catch block

e.printStackTrace();

}

catch (IOException e)

{

// TODO Auto-generated catch block

e.printStackTrace();

}

private static Key readKeyFromDisk(String file)

{

try

{

ObjectInputStream in = new ObjectInputStream(new FileInputStream(

file));

return (Key) in.readObject();

}

catch (FileNotFoundException e)

{

// TODO Auto-generated catch block

e.printStackTrace();

}

catch (IOException e)

{

// TODO Auto-generated catch block

e.printStackTrace();

}

catch (ClassNotFoundException e)

{

// TODO Auto-generated catch block

e.printStackTrace();

}

return null;

}

posted on 2008-03-19 00:08 yill 閱讀(839) 評論(0) 編輯收藏

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