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# About
Node.js implementation of [RFC5869: HMAC-based Extract-and-Expand Key Derivation Function (HKDF)](https://tools.ietf.org/html/rfc5869).
Additionally, it supports a `HKDF-Expand-Label` variation based on [RFC8446: The Transport Layer Security (TLS) Protocol Version 1.3, section 7.1. Key Schedule](https://datatracker.ietf.org/doc/html/rfc8446#section-7.1).
The implementation is fully compliant with test vectors provided in the RFC.
There are alternative modules, but they are:
* much less performing and/or
* have quite poor code quality at the moment and/or
* are not compliant with RFC (e.g. work only with string parameters) and/or
* not working with current Node.js versions and/or
* do not support arbitrary hash functions and/or
* not reliable dependency for FutoIn™ Security concept in general.
Standalone HKDF `extract()` and `expand()` actions are also available for advanced usage.
**Documentation** --> [FutoIn™ Guide](https://futoin.org/docs/miscjs/hkdf/)
Author: [Andrey Galkin](mailto:andrey@futoin.org)
# Performance comparison
The figures in "derived keys per second".
* **futoin-hkdf** - **74 642**
- fully compliant
* `node-hdkf`/`hdkf` modules - *57 707* (~22% slower)
- seems to be broken by design
- **produces wrong results with RFC test vectors**
* `ctrlpanel-hdkf` - *52 181* (~30% slower)
- seems to be compliant
* `@stablelib/hkdf` - *39 808* (~46% slower)
- seems to be compliant
# Installation for Node.js
Command line:
```sh
$ npm install futoin-hkdf --save
```
or:
```sh
$ yarn add futoin-hkdf --save
```
# Examples
```javascript
const hkdf = require('futoin-hkdf');
// Parameter overview
//-------------------
// initial keying material
const ikm = 'string-or-buffer';
// required output length in bytes
const length = 16;
// can be empty string or false equivalent
const salt = 'strongly-encouraged';
// optional parameter
const info = 'optional-context';
// HMAC hashing algorithm to use
const hash = 'SHA-256';
// Generic derivation
//-------------------
hkdf(ikm, length, {salt, info, hash}); // Buffer(length) - derived key
hkdf(ikm, length, {salt, info, hash}).toString('hex'); // String(2*length)
// NOTE: all optional paramaters are passed in object
// With some parameters omitted
//-------------------
hkdf(ikm, length, {salt});
hkdf(ikm, length, {info});
hkdf(ikm, length, {hash});
hkdf(ikm, length);
// Advanced usage (only if you know what you are doing)
//-------------------
// As in underlying Node.js crypto library
const lhash = hash.toLowerCase().replace( '-', '' ); // 'sha256'
hkdf.hash_length(lhash); // get hash_len
hkdf.extract(lhash, hash_len, ikm, salt); // run only step #1
hkdf.expand(lhash, hash_len, prk, length, info); // run only step #2
// TLS v1.3+
//-------------------
const hkdf_tls = require('futoin-hkdf/tls');
const label = 'tls13 ...';
const context = Buffer.from( /* E.g some binary hash generation */ '' );
hkdf_tls(ikm, length, {salt, label, context, hash}); // Buffer(length) - derived key
// Advanced usage
hkdf_tls.expand_label(lhash, hash_len, prk, length, label, context);
// Same as:
hkdf.expand(lhash, hash_len, prk, length, hkdf_tls.info(length, label, context));
```
# API documentation
## Functions
<dl>
<dt><a href="#hkdf">hkdf(ikm, length, salt, info, hash)</a> ⇒ <code>Buffer</code></dt>
<dd><p>HMAC-based Extract-and-Expand Key Derivation Function (HKDF)</p>
</dd>
<dt><a href="#tls">tls(ikm, length, salt, label, info, hash)</a> ⇒ <code>Buffer</code></dt>
<dd><p>TLS v1.3 HKDF-extract + HKFD-Expand-Label action</p>
</dd>
</dl>
<a name="hkdf"></a>
## hkdf(ikm, length, salt, info, hash) ⇒ <code>Buffer</code>
HMAC-based Extract-and-Expand Key Derivation Function (HKDF)
**Kind**: global function
**Returns**: <code>Buffer</code> - Raw buffer with derived key of @p length bytes
| Param | Type | Default | Description |
| --- | --- | --- | --- |
| ikm | <code>Buffer</code> \| <code>string</code> | | Initial Keying Material |
| length | <code>integer</code> | | Required byte length of output |
| salt | <code>Buffer</code> \| <code>string</code> | <code>''</code> | Optional salt (recommended) |
| info | <code>Buffer</code> \| <code>string</code> | <code>''</code> | Optional context (safe to skip) |
| hash | <code>string</code> | <code>"'SHA-256'"</code> | HMAC hash function to use |
* [hkdf(ikm, length, salt, info, hash)](#hkdf) ⇒ <code>Buffer</code>
* [.hash_length(hash)](#hkdf.hash_length) ⇒ <code>integer</code>
* [.extract(hash, hash_len, ikm, salt)](#hkdf.extract) ⇒ <code>Buffer</code>
* [.expand(hash, hash_len, prk, length, info)](#hkdf.expand) ⇒ <code>Buffer</code>
<a name="hkdf.hash_length"></a>
### hkdf.hash\_length(hash) ⇒ <code>integer</code>
Get expected hash length.
**Kind**: static method of [<code>hkdf</code>](#hkdf)
**Returns**: <code>integer</code> - hash digest byte length
**Note**: Values are hardcoded with fallback for unknown algorithms.
| Param | Type | Description |
| --- | --- | --- |
| hash | <code>string</code> | Hash algorithm (as in underlying Node.js crypto library) |
<a name="hkdf.extract"></a>
### hkdf.extract(hash, hash_len, ikm, salt) ⇒ <code>Buffer</code>
HKDF extract action.
**Kind**: static method of [<code>hkdf</code>](#hkdf)
**Returns**: <code>Buffer</code> - A buffer with pseudorandom key
**Note**: Values are hardcoded with fallback for unknown algorithms.
| Param | Type | Description |
| --- | --- | --- |
| hash | <code>string</code> | Hash algorithm (as in underlying Node.js crypto library) |
| hash_len | <code>integer</code> | Hash digest length |
| ikm | <code>Buffer</code> \| <code>string</code> | Initial Keying Material |
| salt | <code>Buffer</code> \| <code>string</code> | Optional salt (recommended) |
<a name="hkdf.expand"></a>
### hkdf.expand(hash, hash_len, prk, length, info) ⇒ <code>Buffer</code>
HKDF expand action.
**Kind**: static method of [<code>hkdf</code>](#hkdf)
**Returns**: <code>Buffer</code> - A buffer with output keying material
**Note**: Values are hardcoded with fallback for unknown algorithms.
| Param | Type | Description |
| --- | --- | --- |
| hash | <code>string</code> | Hash algorithm (as in underlying Node.js crypto library) |
| hash_len | <code>integer</code> | Hash digest length |
| prk | <code>Buffer</code> \| <code>string</code> | A buffer with pseudorandom key |
| length | <code>integer</code> | length of output keying material in octets |
| info | <code>Buffer</code> \| <code>string</code> | Optional context (safe to skip) |
<a name="tls"></a>
## tls(ikm, length, salt, label, info, hash) ⇒ <code>Buffer</code>
TLS v1.3 HKDF-extract + HKFD-Expand-Label action
**Kind**: global function
**Returns**: <code>Buffer</code> - Raw buffer with derived key of @p length bytes
**Note**: label and context are limited to 255 bytes!
| Param | Type | Default | Description |
| --- | --- | --- | --- |
| ikm | <code>Buffer</code> \| <code>string</code> | | Initial Keying Material |
| length | <code>integer</code> | | Required byte length of output |
| salt | <code>Buffer</code> \| <code>string</code> | <code>''</code> | Optional salt (required by fact) |
| label | <code>Buffer</code> \| <code>string</code> | <code>''</code> | Optional label (required by fact) |
| info | <code>Buffer</code> \| <code>string</code> | <code>''</code> | Optional context (safe to skip) |
| hash | <code>string</code> | <code>"'SHA-256'"</code> | HMAC hash function to use |
* [tls(ikm, length, salt, label, info, hash)](#tls) ⇒ <code>Buffer</code>
* [.info(length, label, context)](#tls.info) ⇒ <code>Buffer</code>
* [.expand_label(hash, hash_len, prk, length, label, context)](#tls.expand_label) ⇒ <code>Buffer</code>
<a name="tls.info"></a>
### tls.info(length, label, context) ⇒ <code>Buffer</code>
Encode HKDF context parameter in TLS v1.3 style based on RFC8446 TLS v1.3.
**Kind**: static method of [<code>tls</code>](#tls)
**Returns**: <code>Buffer</code> - A buffer with encoded HKDF context
**Note**: label and context are limited to 255 bytes!
| Param | Type | Description |
| --- | --- | --- |
| length | <code>integer</code> | length of output keying material in octets |
| label | <code>string</code> | ASCII label |
| context | <code>Buffer</code> \| <code>string</code> | Binary context or empty string |
<a name="tls.expand_label"></a>
### tls.expand\_label(hash, hash_len, prk, length, label, context) ⇒ <code>Buffer</code>
TLS-HKDF expand label action - a HKDF-Expand-Label variation based on RFC8446 TLS v1.3.
**Kind**: static method of [<code>tls</code>](#tls)
**Returns**: <code>Buffer</code> - A buffer with output keying material
**Note**: label and context are limited to 255 bytes!
| Param | Type | Description |
| --- | --- | --- |
| hash | <code>string</code> | Hash algorithm (as in underlying Node.js crypto library) |
| hash_len | <code>integer</code> | Hash digest length |
| prk | <code>Buffer</code> \| <code>string</code> | A buffer with pseudorandom key |
| length | <code>integer</code> | length of output keying material in octets |
| label | <code>string</code> | ASCII label |
| context | <code>Buffer</code> \| <code>string</code> | Binary context or empty string |