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## Key derivation
> **See also**: [Libsodium's documentation on its key derivation features](https://download.libsodium.org/doc/key_derivation).
### crypto_kdf_derive_from_key
Derive a subkey from a master key.
**Parameters and their respective types**:
1. `{number}` output length (typically you want `32`)
2. `{number}` subkey ID
3. `{string|Buffer}` context (must be a string/buffer of length 8)
4. `{CryptographyKey}` master key
Returns a `Promise` that resolves to a `CryptographyKey`.
### crypto_kdf_keygen
Returns a `CryptographyKey` object containing a key appropriate
for the `crypto_kdf` API.
### Example for crypto_kdf
```javascript
const { SodiumPlus } = require('sodium-plus');
let sodium;
(async function () {
if (!sodium) sodium = await SodiumPlus.auto();
let masterKey = await sodium.crypto_kdf_keygen();
let context = 'Sodium++';
let subkey1 = await sodium.crypto_kdf_derive_from_key(32, 1, context, masterKey);
let subkey2 = await sodium.crypto_kdf_derive_from_key(32, 2, context, masterKey);
let subkey3 = await sodium.crypto_kdf_derive_from_key(32, 3, context, masterKey);
console.log({
'master-key': masterKey.getBuffer().toString('hex'),
'subkey1': subkey1.getBuffer().toString('hex'),
'subkey2': subkey2.getBuffer().toString('hex'),
'subkey3': subkey3.getBuffer().toString('hex')
});
})();
```
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