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對稱加密

import java.security.InvalidKeyException;

import java.security.NoSuchAlgorithmException;

import java.security.SecureRandom;

import javax.crypto.Cipher;

import javax.crypto.KeyGenerator;

import javax.crypto.NoSuchPaddingException;

import javax.crypto.SecretKey;

import javax.crypto.spec.SecretKeySpec;

public class AESUtil

{

public static String encrypt(String content, String password)

{

String encryptResult = null;

try

{

Cipher cipher = AESUtil.initCipher(Cipher.ENCRYPT_MODE, password);

byte[] byteContent = content.getBytes("UTF8");

byte[] result = cipher.doFinal(byteContent);

encryptResult = parseByte2HexStr(result);

}

catch (Exception e)

{

e.printStackTrace();

}

return encryptResult;

}

public static String decrypt(String content, String password)

{

String decryptResult = null;

try

{

Cipher cipher = AESUtil.initCipher(Cipher.DECRYPT_MODE, password);

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

return decryptResult = new String(result, "UTF8");

}

catch (Exception ex)

{

ex.printStackTrace();

}

return decryptResult;

}

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;

}

private static Cipher initCipher(int model, String password)

throws NoSuchAlgorithmException, NoSuchPaddingException,

InvalidKeyException

{

KeyGenerator kgen = KeyGenerator.getInstance("AES");

kgen.init(128, new SecureRandom(password.getBytes()));

SecretKey secretKey = kgen.generateKey();

byte[] enCodeFormat = secretKey.getEncoded();

SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");

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

cipher.init(model, key);

return cipher;

}

public static void main(String[] args)

{

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

String password = "";

// 加密

System.out.println("加密前：" + content);

String result = AESUtil.encrypt(content, password);

System.out.println("加密后：" + result);

// 解密

System.out.println("解密后：" + AESUtil.decrypt(result, password));

}

posted on 2010-05-28 15:37 HUIKK 閱讀(202) 評論(0) 編輯收藏所屬分類: Java

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