AES 加解密

const crypto = require('crypto');
// 密钥派生：原始字节（不足补零 / 超长截断）
const key = Buffer.from(KEY_HEX, 'hex');   // 256 位
const iv  = Buffer.from(IV_HEX, 'hex');    // 16 字节

const c = crypto.createCipheriv('aes-256-cbc', key, iv);
c.setAutoPadding(true);
const output = Buffer.concat([c.update(plaintext, 'utf8'), c.final()]).toString('base64');

from Crypto.Cipher import AES
from Crypto.Util.Padding import pad
# 密钥派生：原始字节（不足补零 / 超长截断）
key = bytes.fromhex(KEY_HEX)   # 256 位
iv  = bytes.fromhex(IV_HEX)

cipher = AES.new(key, AES.MODE_CBC, iv)
ct = cipher.encrypt(pad(plaintext.encode('utf-8'), AES.block_size))

<?php
// 密钥派生：原始字节（不足补零 / 超长截断）
$key = hex2bin(KEY_HEX);   // 256 位
$iv  = hex2bin(IV_HEX);
$ct = openssl_encrypt($plaintext, 'aes-256-cbc', $key, OPENSSL_RAW_DATA, $iv);
$output = base64_encode($ct);

// 密钥派生：原始字节（不足补零 / 超长截断）
SecretKeySpec key = new SecretKeySpec(keyBytes, "AES");   // 256 位
Cipher c = Cipher.getInstance("AES/CBC/PKCS5Padding");
c.init(Cipher.ENCRYPT_MODE, key, new IvParameterSpec(ivBytes));
byte[] out = c.doFinal(plaintext.getBytes(StandardCharsets.UTF_8));