Java AES加密解密的简单实现方法

Java AES加密解密的简单实现方法

废话不多说，直接上代码

package com.mstf.aes;

import java.io.UnsupportedEncodingException;

import java.security.InvalidKeyException;

import java.security.NoSuchAlgorithmException;

import java.security.SecureRandom;

import javax.crypto.BadPaddingException;

import javax.crypto.Cipher;

import javax.crypto.IllegalBlockSizeException;

import javax.crypto.KeyGenerator;

import javax.crypto.NoSuchPaddingException;

import javax.crypto.SecretKey;

import javax.crypto.spec.SecretKeySpec;

/**

* AES加密解密

* @author ceet

*

*/

public class AESUntil {

/**

* 加密

*

*

*/

public static String Ecodes(String content, String key) {

if (content == null || content.length() < 1)

return null;

try {

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

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

SecretKey secretKey = kgen.generateKey();

byte[] enCodeFormat = secretKey.getEncoded();

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

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

byte[] byteContent = content.getBytes("utf-8");

cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec);

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

StringBuffer sb = new StringBuffer();

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

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

if (hex.length() == 1) {

hex = '0' + hex;

}

sb.append(hex.toUpperCase());

}

return sb.toString();

} catch (NoSuchAlgorithmException e) {

e.printStackTrace();

} catch (NoSuchPaddingException e) {

e.printStackTrace();

} catch (InvalidKeyException e) {

e.printStackTrace();

} catch (UnsupportedEncodingException e) {

e.printStackTrace();

} catch (IllegalBlockSizeException e) {

e.printStackTrace();

} catch (BadPaddingException e) {

e.printStackTrace();

}

return null;

}

/**

* 解密

*

*

*/

public static String Dcodes(String content, String key) {

if (content == null || content.length() < 1)

return null;

if (content.trim().length() < 19)

return content;

byte[] byteRresult = new byte[content.length() / 2];

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

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

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

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

}

try {

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

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

SecretKey secretKey = kgen.generateKey();

byte[] enCodeFormat = secretKey.getEncoded();

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

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

cipher.init(Cipher.DECRYPT_MODE, secretKeySpec);

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

return new String(result);

} catch (NoSuchAlgorithmException e) {

e.printStackTrace();

} catch (NoSuchPaddingException e) {

e.printStackTrace();

} catch (InvalidKeyException e) {

e.printStackTrace();

} catch (IllegalBlockSizeException e) {

e.printStackTrace();

} catch (BadPaddingException e) {

e.printStackTrace();

}

return null;

}

/**

* 详细解释

* 【ceet为加密的密匙】

* 【admin为需要加密的字符串】

* 【67BE5ED967DBA9B9810C295BE6DEF5D5为解密后的字符串】

* 【如果更改ceet，那么67BE5ED967DBA9B9810C295BE6DEF5D5字符串会发生变化】

* @param args

*/

// 调用测试

public static void main(String[] args) {

System.out.println("需要加密的内容："+Ecodes("admindDfRpcO", "ceet"));

System.out.println("经过解密的内容："+Dcodes("67BE5ED967DBA9B9810C295BE6DEF5D5", "ceet"));

}

}

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