crypto.createHash(algorithm[, options])

• 算法 <string>
• 选项 <Object> stream.transform 选项
• 返回: <Hash>

创建并返回一个 Hash 对象，可用于使用给定的 algorithm 生成哈希摘要。可选的 options 参数用于控制流行为。对于像 'shake256' 这样的 XOF 哈希函数，outputLength 选项可用于指定所需的输出字节长度。

【Creates and returns a Hash object that can be used to generate hash digests using the given algorithm. Optional options argument controls stream behavior. For XOF hash functions such as 'shake256', the outputLength option can be used to specify the desired output length in bytes.】

algorithm 取决于平台上 OpenSSL 版本支持的可用算法。例如 'sha256'、'sha512' 等。在较新的 OpenSSL 版本中，使用 openssl list -digest-algorithms 可以显示可用的摘要算法。

【The algorithm is dependent on the available algorithms supported by the version of OpenSSL on the platform. Examples are 'sha256', 'sha512', etc. On recent releases of OpenSSL, openssl list -digest-algorithms will display the available digest algorithms.】

示例：生成文件的 sha256 校验和

【Example: generating the sha256 sum of a file】

import {
  createReadStream,
} from 'node:fs';
import { argv } from 'node:process';
const {
  createHash,
} = await import('node:crypto');

const filename = argv[2];

const hash = createHash('sha256');

const input = createReadStream(filename);
input.on('readable', () => {
  // Only one element is going to be produced by the
  // hash stream.
  const data = input.read();
  if (data)
    hash.update(data);
  else {
    console.log(`${hash.digest('hex')} ${filename}`);
  }
});const {
  createReadStream,
} = require('node:fs');
const {
  createHash,
} = require('node:crypto');
const { argv } = require('node:process');

const filename = argv[2];

const hash = createHash('sha256');

const input = createReadStream(filename);
input.on('readable', () => {
  // Only one element is going to be produced by the
  // hash stream.
  const data = input.read();
  if (data)
    hash.update(data);
  else {
    console.log(`${hash.digest('hex')} ${filename}`);
  }
});拷贝