项目需要 需要java可以解密 php加密的 字符串 ，
使用的方法是 AES128位加解密

坑一踩完 ，还是直接上代码

package com.xxx.init.utils;import com.xxx.init.utils.BaseDataUtil;
import com.xxx.init.exception.xxxRuntimeException;
import com.xxx.init.out.ResultCode;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.StringUtils;import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.nio.charset.StandardCharsets;import java.util.Base64;/*** User:Json* Date: 2024/4/23* **/
@Slf4j
public class AesHelper {/** aes 128*/public static String AES_128_ECB = "AES/ECB/PKCS5Padding";/** aes 256*/public static final String AES_256_ECB = "AES/256/ECB/PKCS5Padding"; // 使用 AES-256-ECB 模式//获取nacos配置文件下的密钥public static String checkSecretKey() {return checkSecretKey(BaseDataUtil.getSystemConfigNacos().getAes128Key());}//获取密钥public static String checkSecretKey(String secretKey) {if (StringUtils.isEmpty(secretKey)) {secretKey = BaseDataUtil.getSystemConfigNacos().getAes128Key();}if (StringUtils.isEmpty(secretKey)) {throw new xxxRuntimeException(ResultCode.AES_KEY_ERROR);}return secretKey;}public static String encrypt128(String data) {String secretKey = padToLengthBytes(checkSecretKey(), 16);return encrypt(data, secretKey, AES_128_ECB, null);}//加密方法，对数据进行加密，返回加密后的数据.public static String encrypt(String data, String secretKey, String method, String iv) {try {secretKey = checkSecretKey(secretKey);SecretKeySpec secretKeySpec = new SecretKeySpec(secretKey.getBytes(), "AES");Cipher cipher = Cipher.getInstance(method); // 使用指定的加密模式if (StringUtils.isEmpty(iv)) {cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec);} else {IvParameterSpec ivSpec = new IvParameterSpec(iv.getBytes());cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec, ivSpec);}byte[] encryptedBytes = cipher.doFinal(data.getBytes(StandardCharsets.UTF_8));//php那边 openssl_encrypt 返回值直接是 base64 然后拿到值后又base64_encode 一次// 所以 java 加密 也要base64 两遍 / 解密也一样 需要两遍return Base64.getEncoder().encodeToString(Base64.getEncoder().encodeToString(encryptedBytes).getBytes());} catch (Exception e) {log.error("【AES加密失败】：" + e.getMessage());throw new xxxRuntimeException(ResultCode.AES_ENCRYPT_ERROR);}}public static String decrypt128(String data) {String secretKey = padToLengthBytes(checkSecretKey(), 16);return decrypt(data, secretKey, AES_128_ECB, null);}//解密方法，对数据进行解密，返回解密后的数据.public static String decrypt(String data, String secretKey, String method, String iv) {try {secretKey = checkSecretKey(secretKey);SecretKeySpec secretKeySpec = new SecretKeySpec(secretKey.getBytes(), "AES");Cipher cipher = Cipher.getInstance(method); // 使用指定的解密模式if (StringUtils.isEmpty(iv)) {cipher.init(Cipher.DECRYPT_MODE, secretKeySpec);} else {IvParameterSpec ivSpec = new IvParameterSpec(iv.getBytes());cipher.init(Cipher.DECRYPT_MODE, secretKeySpec, ivSpec);}//base64 解密两次byte[] decodedBytes = Base64.getDecoder().decode(new String(Base64.getDecoder().decode(data)));byte[] decryptedBytes = cipher.doFinal(decodedBytes);return new String(decryptedBytes);} catch (Exception e) {log.error("【AES解密失败】：" + e.getMessage());throw new xxxRuntimeException(ResultCode.AES_DECRYPT_ERROR);}}//如果密钥 不足16位 或者超过16位的 处理方案 保证和php 那边一样 php的openssl_encrypt会自动补全 java需要手动补全//input 要补全的字符串 , length 跟多少位补全  常用的 16位 32位public static String padToLengthBytes(String input, int length) {// 转换input为字节数组byte[] inputBytes = input.getBytes(StandardCharsets.UTF_8);// 如果输入的字节数大于指定长度，只取前指定长度字节；否则，补全到指定长度字节byte[] keyBytes = new byte[length];if (inputBytes.length > length) {System.arraycopy(inputBytes, 0, keyBytes, 0, length);} else {int paddingLength = length - inputBytes.length % length;byte[] paddedKeyBytes = new byte[inputBytes.length + paddingLength];System.arraycopy(inputBytes, 0, paddedKeyBytes, 0, inputBytes.length);keyBytes = paddedKeyBytes;}// 将keyBytes转换为字符串return new String(keyBytes, StandardCharsets.UTF_8);}public static void main(String[] args) {String encrypted = AesHelper.encrypt("哈哈，我是谁！",padToLengthBytes("11111",16),AES_128_ECB,null);String decrypted = AesHelper.decrypt("ZkN4UUoyL0RqOEtYYWJNblk2VjI3YjNjN3l4d0ZGSEYwc1J5WXNzZDlxVT0=",padToLengthBytes("111111",16),AES_128_ECB,null);System.out.println("加密值：" + encrypted);System.out.println("解密值：" + decrypted);}
}

如果疑问 php openssl_encrypt() 为什么加密后会直接base64 可以了解一下 openssl_encrypt 下面3个常量
所以java这边需要不需要 base64 两边取决于 php 用没用 下面三个常量

OPENSSL_RAW_DATA=1
OPENSSL_ZERO_PADDING=2
OPENSSL_NO_PADDING=3

结束