package com.doumee.core.utils;
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import java.nio.charset.StandardCharsets;
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import java.security.Security;
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import javax.crypto.Cipher;
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import javax.crypto.spec.IvParameterSpec;
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import javax.crypto.spec.SecretKeySpec;
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import org.apache.commons.codec.binary.Base64;
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import org.bouncycastle.jce.provider.BouncyCastleProvider;
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import lombok.Data;
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import org.springframework.beans.factory.annotation.Value;
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import org.springframework.stereotype.Component;
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/**
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* AES加解密
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* @author dm
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* @since 2025/03/31 16:44
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*/
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@Data
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@Component
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public class AES {
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// 密钥
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@Value("${security.aes.key}")
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private String key;
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// 偏移量
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@Value("${security.aes.iv}")
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private String iv;
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// 密钥长度
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private Integer keyLen = 128;
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public AES() {
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Security.addProvider(new BouncyCastleProvider());
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}
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/**
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* 加密
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*
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* @return String
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*/
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public String encrypt(String plainText) throws SecurityException {
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try {
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Cipher cipher = Cipher.getInstance("AES/CBC/PKCS7Padding", "BC");// 创建密码器
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cipher.init(Cipher.ENCRYPT_MODE, this.getAESKey(), new IvParameterSpec(paddingIv(iv)));// 初始化
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return new Base64().encodeAsString(cipher.doFinal(plainText.getBytes(StandardCharsets.UTF_8)));
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} catch (Exception e) {
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throw new SecurityException("AES encrypt throw an exception", e);
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}
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}
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/**
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* 解密
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*
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* @param cipherText 密文
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* @return String
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*/
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public String decrypt(String cipherText) throws SecurityException {
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try {
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byte[] encrypted = new Base64().decode(cipherText);
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Cipher cipher = Cipher.getInstance("AES/CBC/PKCS7Padding");
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cipher.init(Cipher.DECRYPT_MODE, this.getAESKey(), new IvParameterSpec(paddingIv(iv)));
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return new String(cipher.doFinal(encrypted), StandardCharsets.UTF_8);
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} catch (Exception e) {
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throw new SecurityException("AES decrypt throw an exception", e);
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}
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}
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/**
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* 获取AES key
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*
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* @return SecretKeySpec
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*/
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private SecretKeySpec getAESKey() {
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/* 使用原始密钥进行加密，要求密钥为密钥长度的倍数 */
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byte[] raw = key.getBytes(StandardCharsets.UTF_8);
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return new SecretKeySpec(raw, "AES");
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}
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/**
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* 初始化向量一直保持16位
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*
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* @param iv 向量
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* @return byte[]
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*/
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private byte[] paddingIv(String iv) {
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byte[] ivBytes = iv.getBytes(StandardCharsets.UTF_8);
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byte[] bs = new byte[keyLen / 8];
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System.arraycopy(ivBytes, 0, bs, 0, ivBytes.length);
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return bs;
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}
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}
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