yexuejc-base/src/main/java/com/yexuejc/base/encrypt/AES.java

package com.yexuejc.base.encrypt;

import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.util.Base64;
import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

/**
 * AES加解密
 *
 * @author maxf
 * @class-name AES
 * @description
 * @date 2022/11/11 15:36
 */
public class AES {
    public static AES builder() {
        return Instace.aes;
    }

    private static class Instace {
        private static AES aes = new AES();
    }

    public static final String AES_ALGORITHM = "AES";

    /**
     * 加密模式
     */
    public static enum ALGORITHM {
        //算法/模式/填充                 16字节加密后数据长度       不满16字节加密后长度
        //AES/CBC/NoPadding                   16                          不支持
        AES_CBC_NoPadding("AES/CBC/NoPadding"),
        //AES/CBC/PKCS5Padding                32                          16
        AES_CBC_PKCS5Padding("AES/CBC/PKCS5Padding"),
        //AES/CBC/PKCS7Padding                32                          16
        AES_CBC_PKCS7Padding("AES/CBC/PKCS7Padding"),
        //AES/CBC/ISO10126Padding             32                          16
        AES_CBC_ISO10126Padding("AES/CBC/ISO10126Padding"),
        //AES/CBC/ZeroPadding                 16                          16
        AES_CBC_ZeroPadding("AES/CBC/ZeroPadding"),
        //AES/CFB/NoPadding                   16                          原始数据长度
        AES_CFB_NoPadding("AES/CFB/NoPadding"),
        //AES/CFB/PKCS5Padding                16                          不支持
        AES_CFB_PKCS5Padding("AES/CFB/PKCS5Padding"),
        //AES/CFB/PKCS7Padding                16                          不支持
        AES_CFB_PKCS7Padding("AES/CFB/PKCS7Padding"),
        //AES/CFB/ISO10126Padding             16                          不支持
        AES_CFB_ISO10126Padding("AES/CFB/ISO10126Padding"),
        //AES/CFB/ZeroPadding                 16                          不支持
        AES_CFB_ZeroPadding("AES/CFB/ZeroPadding"),
        //AES/ECB/NoPadding                   16                          不支持
        AES_ECB_NoPadding("AES/ECB/NoPadding"),
        //AES/ECB/PKCS5Padding                32                          不支持
        AES_ECB_PKCS5Padding("AES/ECB/PKCS5Padding"),
        //AES/ECB/PKCS7Padding                32                          16
        AES_ECB_PKCS7Padding("AES/ECB/PKCS7Padding"),
        //AES/ECB/ISO10126Padding             32                          16
        AES_ECB_ISO10126Padding("AES/ECB/ISO10126Padding"),
        //AES/ECB/ZeroPadding                 16                          16
        AES_ECB_ZeroPadding("AES/ECB/ZeroPadding"),
        //AES/OFB/NoPadding                   16                          原始数据长度
        AES_OFB_NoPadding("AES/OFB/NoPadding"),
        //AES/OFB/PKCS5Padding                32                          16
        AES_OFB_PKCS5Padding("AES/OFB/PKCS5Padding"),
        //AES/OFB/PKCS7Padding                32                          16
        AES_OFB_PKCS7Padding("AES/OFB/PKCS7Padding"),
        //AES/OFB/ISO10126Padding             32                          16
        AES_OFB_ISO10126Padding("AES/OFB/ISO10126Padding"),
        //AES/OFB/ZeroPadding                 16                          16
        AES_OFB_ZeroPadding("AES/OFB/ZeroPadding"),
        //AES/PCBC/NoPadding                  16                          不支持
        AES_PCBC_NoPadding("AES/PCBC/NoPadding"),
        //AES/PCBC/PKCS5Padding               32                          16
        AES_PCBC_PKCS5Padding("AES/PCBC/PKCS5Padding"),
        //AES/PCBC/ISO10126Padding            32                          16
        AES_PCBC_ISO10126Padding("AES/PCBC/ISO10126Padding"),
        //AES/CTR/NoPadding                  16                          不支持
        AES_CTR_NoPadding("AES/CTR/NoPadding");
        public String name;

        ALGORITHM(String name) {
            this.name = name;
        }
    }

    private ALGORITHM algorithm = ALGORITHM.AES_CBC_NoPadding;
    private String key = "hj7x89H$yuBI0456";
    private String iv = "NIfb&95GUY86Gfgh";
    private Charset charset = StandardCharsets.UTF_8;

    /**
     * 加密
     *
     * @param data 明文
     * @return 密文
     * @Description AES算法加密明文
     */
    public String encrypt(String data) throws Exception {
        try {

            Cipher cipher = Cipher.getInstance(algorithm.name);
            int blockSize = cipher.getBlockSize();
            byte[] dataBytes = data.getBytes(charset);
            int plaintextLength = dataBytes.length;
            if (plaintextLength % blockSize != 0) {
                plaintextLength = plaintextLength + (blockSize - (plaintextLength % blockSize));
            }
            byte[] plaintext = new byte[plaintextLength];
            System.arraycopy(dataBytes, 0, plaintext, 0, dataBytes.length);
            SecretKeySpec keyspec = new SecretKeySpec(key.getBytes(charset), AES_ALGORITHM);
            IvParameterSpec ivspec = null;
            if(!algorithm.name.contains("ECB")){
                ivspec = new IvParameterSpec(iv.getBytes(charset));
            }
            cipher.init(Cipher.ENCRYPT_MODE, keyspec, ivspec);
            byte[] encrypted = cipher.doFinal(plaintext);
            return Base64.getEncoder().encodeToString(encrypted);
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

    /**
     * 解密
     *
     * @param data 密文
     * @return 明文
     * @Description AES算法解密密文
     */
    public String decrypt(String data) throws Exception {
        try {
            byte[] encrypted = Base64.getDecoder().decode(data);
            Cipher cipher = Cipher.getInstance(algorithm.name);
            SecretKeySpec keyspec = new SecretKeySpec(key.getBytes(charset), AES_ALGORITHM);
            IvParameterSpec ivspec = null;
            if(!algorithm.name.contains("ECB")){
                ivspec = new IvParameterSpec(iv.getBytes(charset));
            }
            cipher.init(Cipher.DECRYPT_MODE, keyspec, ivspec);
            byte[] original = cipher.doFinal(encrypted);
            return new String(original, charset).trim();
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }
//
//    public static void main(String[] args) throws Exception {
//        String str = "  奥萨蒂  asd8阿斯顿8asd  ";
//        AES.builder().setAlgorithm(ALGORITHM.AES_CBC_ISO10126Padding);
//        AES.builder().setKey("DEsx89H$yuBI0456");
//        String encrypt = AES.builder().encrypt(str);
//        System.out.println(encrypt);
//        String decrypt = AES.builder().decrypt(encrypt);
//        System.out.println(">>>" + decrypt + "<<<");
//    }

    public ALGORITHM getAlgorithm() {
        return algorithm;
    }

    public AES setAlgorithm(ALGORITHM algorithm) {
        this.algorithm = algorithm;
        return this;
    }

    public String getKey() {
        return key;
    }

    public AES setKey(String key) {
        this.key = key;
        return this;
    }

    public String getIv() {
        return iv;
    }

    public AES setIv(String iv) {
        this.iv = iv;
        return this;
    }

    public Charset getCharset() {
        return charset;
    }

    public AES setCharset(Charset charset) {
        this.charset = charset;
        return this;
    }
}