在node中加密文件，在java中使用"AES/GCM/NoPadding“解密。在node.js中基本上等同于AES/GCM/无填充

const crypto = require('crypto');

const key = crypto.randomBytes(32); // 生成32字节的随机密钥

const cipher = crypto.createCipheriv('aes-256-gcm', key, iv);

const fs = require('fs');
const input = fs.createReadStream('input.txt'); // 待加密的文件路径
const output = fs.createWriteStream('output.txt'); // 加密后的文件路径

input.pipe(cipher).pipe(output);

const crypto = require('crypto');
const fs = require('fs');

const key = crypto.randomBytes(32);
const iv = crypto.randomBytes(16);

const cipher = crypto.createCipheriv('aes-256-gcm', key, iv);
const input = fs.createReadStream('input.txt');
const output = fs.createWriteStream('output.txt');

input.pipe(cipher).pipe(output);

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.spec.GCMParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;

Path encryptedFilePath = Paths.get("output.txt"); // 加密后的文件路径
byte[] encryptedData = Files.readAllBytes(encryptedFilePath);

byte[] keyBytes = "0123456789abcdef0123456789abcdef".getBytes(); // 密钥，需要与加密时使用的密钥一致
SecretKey key = new SecretKeySpec(keyBytes, "AES");

Cipher cipher = Cipher.getInstance("AES/GCM/NoPadding");
GCMParameterSpec spec = new GCMParameterSpec(128, iv); // iv是加密时使用的初始化向量，需要与加密时一致
cipher.init(Cipher.DECRYPT_MODE, key, spec);

byte[] decryptedData = cipher.doFinal(encryptedData);

Path decryptedFilePath = Paths.get("decrypted.txt"); // 解密后的文件路径
Files.write(decryptedFilePath, decryptedData);

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.spec.GCMParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;

public class FileDecryption {
    public static void main(String[] args) throws Exception {
        Path encryptedFilePath = Paths.get("output.txt");
        byte[] encryptedData = Files.readAllBytes(encryptedFilePath);

        byte[] keyBytes = "0123456789abcdef0123456789abcdef".getBytes();
        SecretKey key = new SecretKeySpec(keyBytes, "AES");

        Cipher cipher = Cipher.getInstance("AES/GCM/NoPadding");
        GCMParameterSpec spec = new GCMParameterSpec(128, iv);
        cipher.init(Cipher.DECRYPT_MODE, key, spec);

        byte[] decryptedData = cipher.doFinal(encryptedData);

        Path decryptedFilePath = Paths.get("decrypted.txt");
        Files.write(decryptedFilePath, decryptedData);
    }
}