AES加密、解密

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#加密解密

本文档提供了一个使用BouncyCastle库进行AES加密和解密的Java实现。代码示例展示了如何在ECB模式下，使用PKCS7Padding填充方式，通过指定密码对字符串进行加解密操作。此外，还包含了初始化BouncyCastleProvider的方法。

AES加密、解密

1.引入依赖

    <dependency>
        <groupId>org.bouncycastle</groupId>
        <artifactId>bcprov-jdk15on</artifactId>
        <version>1.56</version>
    </dependency>

2.加密算法：AES
工作模式：ECB
填充方式：PKCS7Padding
密码：加解密的密码

3.代码：

package com.entity;

import org.bouncycastle.jce.provider.BouncyCastleProvider;
import javax.crypto.Cipher;
import java.security.Provider;
import javax.crypto.spec.SecretKeySpec;
import java.security.Security;

/**
 * AES加密、解密
 * 需要依赖
 *        AES/ECB/PKCS7Padding7
 *         <dependency>
 *             <groupId>org.bouncycastle</groupId>
 *             <artifactId>bcprov-jdk15on</artifactId>
 *             <version>1.56</version>
 *         </dependency>
 * @ClassName AesEncrypt
 * @Author lp
 * @Date 2021/8/11 11:39
 */
public class AesEncrypt {
    public static boolean initialized = false;

    /** 加密
     * @param source 加密内容
     * @param password 加密密码 ： elevator-ls96333
     * @return
     */
    public static String encrypt(String source, String password) {
        byte[] key = password.getBytes();
        initialize();
        byte[] result = null;
        try {
            /**
             * 加解密算法/工作模式/填充方式
             */
            Cipher cipher = Cipher.getInstance("AES/ECB/PKCS7Padding", "BC");
            //创建密钥
            SecretKeySpec keySpec = new SecretKeySpec(key, "AES");
            // 初始化cipher，常数1为使用加密模式
            cipher.init(1, keySpec);
            result = cipher.doFinal(source.getBytes("UTF-8"));
        } catch (Exception e) {
            e.printStackTrace();
        }
        return parseByte2HexStr(result).toUpperCase();
    }

    /**
     * 解密
     * @param source
     * @param password
     * @return
     */
    public static String decrypt(String source, String password) {
        byte[] bytes = parseHexStr2Byte(source);
        byte[] key = password.getBytes();
        initialize();
        String result = null;
        try {
            Cipher cipher = Cipher.getInstance("AES/ECB/PKCS7Padding", "BC");
            SecretKeySpec keySpec = new SecretKeySpec(key, "AES");
            cipher.init(2, keySpec); //常数2解密模式
            byte[] decoded = cipher.doFinal(bytes);
            result = new String(decoded, "UTF-8");
        } catch (Exception e) {
            e.printStackTrace();
        }
        return result;
    }

    public static void initialize() {
        if (initialized) {
            return;
        }
        //BouncyCastleProvider
        Security.addProvider((Provider) new BouncyCastleProvider());
        initialized = true;
    }

    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.toLowerCase());
        }
        return sb.toString();
    }

    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) {
        //密码只能是128,192或者256位，  1个字节是8位， 一个英文字母或者数字为1个字节 。此处密码设置为16字节
        String encrypt = AesEncrypt.encrypt("https://baike.baidu.com/item/hello%20world/85501?fr=aladdin", "elevator-ls96333");
        System.out.println("加密"+encrypt);
        String decrypt = AesEncrypt.decrypt(encrypt, "elevator-ls96333");
        System.out.println("解密"+decrypt);
    }
}