crypto.generateKeySync(type, options)

• type：<string> 生成的密钥的预期用途。当前接受的值为 'hmac' 和 'aes'。

  ¥type: <string> The intended use of the generated secret key. Currently accepted values are 'hmac' and 'aes'.

• options：<Object>

  • length：<number> 要生成的密钥的位长度。

    ¥length: <number> The bit length of the key to generate.

    • 如果 type 是 'hmac'，则最小长度为 8，最大长度为 2³¹-1。如果该值不是 8 的倍数，则生成的密钥将被截断为 Math.floor(length / 8)。

      ¥If type is 'hmac', the minimum is 8, and the maximum length is 2³¹-1. If the value is not a multiple of 8, the generated key will be truncated to Math.floor(length / 8).

    • 如果 type 是 'aes'，则长度必须是 128、192 或 256 之一。

      ¥If type is 'aes', the length must be one of 128, 192, or 256.

• 返回：<KeyObject>

  ¥Returns: <KeyObject>

同步生成给定 length 的新的随机的密钥。type 将确定将在 length 上执行哪些验证。

¥Synchronously generates a new random secret key of the given length. The type will determine which validations will be performed on the length.

const {
  generateKeySync,
} = await import('node:crypto');

const key = generateKeySync('hmac', { length: 512 });
console.log(key.export().toString('hex'));  // e89..........41econst {
  generateKeySync,
} = require('node:crypto');

const key = generateKeySync('hmac', { length: 512 });
console.log(key.export().toString('hex'));  // e89..........41e拷贝

生成的 HMAC 密钥的大小不应超过底层哈希函数的块大小。有关详细信息，请参阅 crypto.createHmac()。

¥The size of a generated HMAC key should not exceed the block size of the underlying hash function. See crypto.createHmac() for more information.