内置模块

一、Crypto 模块

Hash

• 文件哈希计算

  流式读取大文件并计算哈希，避免内存溢出。

  import { createReadStream } from 'fs';
  import { createHash } from 'crypto';
  
  const calculateFileHash = (filePath, algorithm = 'md5') => {
    return new Promise((resolve, reject) => {
      const stream = createReadStream(filePath);
      const hash = createHash(algorithm);
  
      stream.on('data', (chunk) => hash.update(chunk));
      stream.on('end', () => resolve(hash.digest('hex')));
      stream.on('error', reject);
    });
  };
  
  // 使用示例
  calculateFileHash('./file.txt')
    .then(md5 => console.log('File MD5:', md5))
    .catch(console.error);
  

• 字符串哈希计算

  直接对字符串内容进行哈希。

  import { createHash } from 'crypto';
  
  const hashString = (text, algorithm = 'sha256') => {
    return createHash(algorithm)
      .update(text)
      .digest('hex');
  };
  
  console.log('SHA-256:', hashString('Hello World'));