Node.js crypto.hkdfSync()方法
原文:https://www . geesforgeks . org/node-js-crypto-hkdfsync-method/
该方法提供了基于同步 HMAC 的提取和扩展密钥派生函数密钥派生。给定键、盐和信息，使用摘要导出密钥T2】字节的密钥。
语法:
crypto.hkdfSync(digest, key, salt, info, keylen)
参数:该方法有 5 个参数。
- Digest: It must be a string.
- Key: Minimum length—1 byte, the type is string, buffer, array buffer, type data area, key object or data view.
- Salt: must be provided, but it can be zero-length and unique. Can be string , array buffer, buffer, type DARAY or data view .
- Information: must be provided, but it can be of zero length and cannot exceed 1024 bytes. Its type is string, buffer, array buffer, type buffer, key object or data view.
- keylen: is the length of the key to be generated and must be greater than 0. It must be a number of type B..
返回类型:以缓冲区的形式返回派生键。
例 1:
app.js
// Node.js program to demonstrate the
// crypto.hkdfSync() Method.
// // Including crypto module
import crypto from 'crypto'
//Implementing hkdfSync()
const Key = crypto.hkdfSync('sha512', 'key', 'salt', 'info', 64);
// Prints Buffer.
console.log(Key);
输出:
ArrayBuffer {
[Uint8Contents]: <24 15 6e 2c 35 52 5b
aa f3 d0 fb b9 2b 73 4c 80 32 a1 10 a3 f1 2e
25 96 e4 41 e1 92 48 70 d8 4c 3a 50 06 52 a7
23 73 80 24 43 24 51 04 6f d2 37 ef ad 83 92
fb 68 6c 52 77 a5 9e 01 05 39 16 53>,
byteLength: 64
}
例 2:
app . js
// Node.js program to demonstrate the
// crypto.hkdfSync() Method.
// Including crypto module
import crypto from 'crypto'
// Implementing hkdfSync()
const Key = crypto.hkdfSync('sha512', 'key', 'salt', 'info', 16);
// Prints Buffer.
console.log(Buffer.from(Key).toString('hex'));
输出:
24156e2c35525baaf3d0fbb92b734c80
例三:
Javascript
// Node.js program to demonstrate the
// crypto.hkdfSync() Method.
// Including crypto module
import crypto from 'crypto'
//Implementing hkdfSync()
const Key = crypto.hkdfSync('sha512', 'key', 'salt', 'info', 32);
// Prints Buffer.
console.log(Buffer.from(Key).toString('base64'));
输出:
JBVuLDVSW6rz0Pu5K3NMgDKhEKPxLiWW5EHhkkhw2Ew=
例 4:
Javascript
// Node.js program to demonstrate the
// crypto.hkdfSync() Method.
// Including crypto module
import crypto from 'crypto'
// Implementing hkdfSync()
const Key = crypto.hkdfSync('sha512', 'key', 'salt', 'info', 32);
// Prints Buffer.
console.log(Buffer.from(Key).toString('ascii'));
输出:
$n,5R[*sP{9+sL 2!#q.%dAaHpXL
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