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非對稱加密

package com.roadway.sms.dao.test;

import java.security.KeyFactory;

import java.security.KeyPair;

import java.security.KeyPairGenerator;

import java.security.PrivateKey;

import java.security.PublicKey;

import java.security.spec.PKCS8EncodedKeySpec;

import java.security.spec.X509EncodedKeySpec;

import javax.crypto.Cipher;

public class RSAUtil

{

public static void main(String[] args) throws Exception

{

String[] ppk = RSAUtil.getKeyPair();

System.out.println("公鑰: " + ppk[0]);

System.out.println("私鑰: " + ppk[1]);

String content = "123456惠萬鵬~!@#$%^&*()_+|";

System.out.println("原字符串: " + content);

String encryptStr = RSAUtil.encrypt(ppk[0], content);

System.out.println("加密后字符串: " + encryptStr);

String decryptStr = RSAUtil.decrypt(ppk[1], encryptStr);

System.out.println("解密后字符串: " + decryptStr);

}

public static String[] getKeyPair()

{

String[] publicPrivateKey = { null, null };

try

{

KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA");

keyPairGenerator.initialize(1024);

KeyPair keyPair = keyPairGenerator.genKeyPair();

publicPrivateKey[0] = parseByte2HexStr(keyPair.getPublic().getEncoded());

publicPrivateKey[1] = parseByte2HexStr(keyPair.getPrivate().getEncoded());

}

catch (Exception ex)

{

ex.printStackTrace();

}

return publicPrivateKey;

}

public static String encrypt(String publicKeyCode, String content)

{

String encryptRes = null;

try

{

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

X509EncodedKeySpec keySpec = new X509EncodedKeySpec(RSAUtil.parseHexStr2Byte(publicKeyCode));

KeyFactory keyFactory = KeyFactory.getInstance("RSA");

PublicKey pubKey = keyFactory.generatePublic(keySpec);

cipher.init(Cipher.ENCRYPT_MODE, pubKey);

byte[] publicKeyEncryptText = cipher.doFinal(content.getBytes());

encryptRes = parseByte2HexStr(publicKeyEncryptText);

}

catch (Exception ex)

{

ex.printStackTrace();

}

return encryptRes;

}

public static String decrypt(String privateKeyCode, String content)

{

String decryptRes = null;

try

{

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

PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(RSAUtil.parseHexStr2Byte(privateKeyCode));

KeyFactory keyFactory2 = KeyFactory.getInstance("RSA");

PrivateKey priKey = keyFactory2.generatePrivate(pkcs8KeySpec);

cipher.init(Cipher.DECRYPT_MODE, priKey);

byte[] privateKeyDecryptText = cipher.doFinal(RSAUtil.parseHexStr2Byte(content));

decryptRes = new String(privateKeyDecryptText);

}

catch (Exception ex)

{

ex.printStackTrace();

}

return decryptRes;

}

private static String parseByte2HexStr(byte buf[])

{

StringBuffer sb = new StringBuffer();

for (int i = 0; i < buf.length; i++)

{

String hex = Integer.toHexString(buf[i] & 0xFF);

if (hex.length() == 1)

{

hex = '0' + hex;

}

sb.append(hex.toUpperCase());

}

return sb.toString();

}

private static byte[] parseHexStr2Byte(String hexStr)

{

if (hexStr.length() < 1)

return null;

byte[] result = new byte[hexStr.length() / 2];

for (int i = 0; i < hexStr.length() / 2; i++)

{

int high = Integer.parseInt(hexStr.substring(i * 2, i * 2 + 1), 16);

int low = Integer.parseInt(hexStr.substring(i * 2 + 1, i * 2 + 2), 16);

result[i] = (byte) (high * 16 + low);

}

return result;

}

posted on 2010-05-28 16:31 HUIKK 閱讀(269) 評論(0) 編輯收藏所屬分類: Java

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