package com.webmanage.util;
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import com.webmanage.common.BusinessException;
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import lombok.extern.slf4j.Slf4j;
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import org.apache.commons.lang3.StringUtils;
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import javax.crypto.Cipher;
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import javax.crypto.spec.GCMParameterSpec;
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import javax.crypto.spec.SecretKeySpec;
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/**
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* AES加密工具类
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*
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* @author August
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* @date 2022-07-29
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*/
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@Slf4j
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public class AESUtil {
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private AESUtil() {
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}
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/**
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* AES_KEY
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*/
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private static final String AES_KEY = "sD6i0YYW1a5FnzF6vRf13VtHocZabRcI";
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/**
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* GCM_IV
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*/
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private static final String GCM_IV = "1SzB4YR0c0E9";
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/**
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* GCM_TAG长度
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*/
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private static final int GCM_TAG_LENGTH = 16;
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/**
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* 加密
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*
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* @param plaintext 待加密文本
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* @param key AES_KEY
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* @param iv GCM_IV
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* @return 密文
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*/
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public static String encrypt(String plaintext, byte[] key, byte[] iv) {
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if (StringUtils.isBlank(plaintext) || key == null || iv == null) {
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throw new BusinessException("加密参数不能为空");
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}
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try {
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Cipher cipher = Cipher.getInstance("AES/GCM/NoPadding");
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SecretKeySpec keySpec = new SecretKeySpec(key, "AES");
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GCMParameterSpec gcmParameterSpec = new GCMParameterSpec(GCM_TAG_LENGTH * 8, iv);
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cipher.init(Cipher.ENCRYPT_MODE, keySpec, gcmParameterSpec);
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// Perform Encryption
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byte[] cipherText = cipher.doFinal(plaintext.getBytes());
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StringBuilder sb = new StringBuilder();
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for (byte b : cipherText) {
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String hex = Integer.toHexString(b & 0xFF);
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if (hex.length() == 1) {
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hex = '0' + hex;
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}
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sb.append(hex);
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}
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return sb.toString();
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} catch (Exception e) {
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throw new BusinessException("加密失败");
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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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* @param key AES_KEY
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* @param iv GCM_IV
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* @return 解密结果
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*/
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public static String decrypt(String cipherText, byte[] key, byte[] iv) {
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if (StringUtils.isBlank(cipherText) || key == null || iv == null) {
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throw new BusinessException("解密参数不能为空");
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}
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try {
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byte[] cipherTextByte = new byte[cipherText.length() / 2];
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for (int i = 0; i < cipherText.length() / 2; i++) {
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int high = Integer.parseInt(cipherText.substring(i * 2, i * 2 + 1),
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16);
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int low = Integer.parseInt(
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cipherText.substring(i * 2 + 1, i * 2 + 2), 16);
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cipherTextByte[i] = (byte) (high * 16 + low);
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}
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Cipher cipher = Cipher.getInstance("AES/GCM/NoPadding");
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SecretKeySpec keySpec = new SecretKeySpec(key, "AES");
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GCMParameterSpec gcmParameterSpec = new GCMParameterSpec(GCM_TAG_LENGTH * 8, iv);
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cipher.init(Cipher.DECRYPT_MODE, keySpec, gcmParameterSpec);
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byte[] decryptedText = cipher.doFinal(cipherTextByte);
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return new String(decryptedText);
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} catch (Exception e) {
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throw new BusinessException("解密失败");
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}
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}
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/**
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* 使用默认密钥和IV进行解密
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* @param cipherText 以十六进制字符串表示的密文
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* @return 明文
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*/
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public static String decryptWithDefaultKey(String cipherText) {
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return decrypt(cipherText, AES_KEY.getBytes(), GCM_IV.getBytes());
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}
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public static void main(String[] args) {
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// String plainText = "zynlpt2024";
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String plainText = "postgres";
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log.info("Original Text : " + plainText);
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String cipherText = encrypt(plainText, AES_KEY.getBytes(), GCM_IV.getBytes());
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log.info("Encrypted Text : " + cipherText);
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String decryptedText = decrypt(cipherText, AES_KEY.getBytes(), GCM_IV.getBytes());
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log.info("DeCrypted Text : " + decryptedText);
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}
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}
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