AES 密码加密保存

来源：互联网发布：软件开发招标书编辑：程序博客网时间：2024/05/21 08:40

今天做了一个用AES进行密码加密的功能(不需要jar包 jdk自带)

详细步骤如下：

1.先用main方法测试一下，能否将密码加密

package com.demo.util;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;public class MyAES {    public static byte[] encrypt(String content, String password) {        try {            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");// 创建密码器            byte[] byteContent = content.getBytes("utf-8");            cipher.init(Cipher.ENCRYPT_MODE, key);// 初始化            byte[] result = cipher.doFinal(byteContent);            return result; // 加密        } 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     * @param content  待解密内容     * @param password 解密密钥     * @return     */    public static byte[] decrypt(byte[] content, String password) {        try {            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");// 创建密码器            cipher.init(Cipher.DECRYPT_MODE, key);// 初始化            byte[] result = cipher.doFinal(content);            return result; // 加密        } 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;    }    /**将二进制转换成16进制     * @param buf     * @return     */    public 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();    }    /**将16进制转换为二进制     * @param hexStr     * @return     */    public 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;    }    public static void main(String[] args){        String content = "123";        String password = "1234567890123";        //加密        System.out.println("加密前：" + content);        byte[] encryptResult = encrypt(content, password);        String encryptResultStr = parseByte2HexStr(encryptResult);        System.out.println("加密后：" + encryptResultStr);        //解密        byte[] decryptFrom = parseHexStr2Byte(encryptResultStr);        byte[] decryptResult = decrypt(decryptFrom,password);        System.out.println("解密后：" + new String(decryptResult));    }}

2.创建一个配置文件(system.properties),这是一个密钥，可以自己定义

key=henglin2016

3.获取密钥：

package com.demo.util;import java.util.Iterator;import java.util.ResourceBundle;public class SystemKey {    private static ResourceBundle bundle;    static {        bundle = ResourceBundle.getBundle("system");        if (bundle == null) {            throw new IllegalArgumentException("system.properties is not found!");        }    }    public static String getStr(String key){        if(bundle!=null){            return bundle.getString(key);        }else{            return null;        }    }    public static void main(String[] args) {        if(bundle != null) {            Iterator<String> it = bundle.keySet().iterator() ;            while (it.hasNext()) {                System.out.println(it.next());            }        }    }}

4.需要的都已准备好，现在只需在你需要的地方引用就可以

（1）这是登录的时候密码加密和注册的时候密码加密，是一样的。

  String AESkey=SystemKey.getStr("key");        //加密        byte[] encryptResult = MyAES.encrypt(pw, AESkey);        pw = MyAES.parseByte2HexStr(encryptResult);

在数据库中密码就被加密了，如下：

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