sodium_crypto_kdf_derive_from_key
(PHP 7 >= 7.2.0, PHP 8)
sodium_crypto_kdf_derive_from_key — Derive a subkey
Description
sodium_crypto_kdf_derive_from_key( int $subkey_length, int $subkey_id, string $context, string $key ): string
Derive a subkey from a root key and additional context.
Similar to hash_hkdf().
Parameters
-
subkey_length -
Length of the key to return (in bytes)
-
subkey_id -
Return the Nth subkey from a given root key. Useful for seeking.
-
context -
Application-specific context.
-
key -
The root key from which the subkey is derived.
Return Values
A string of pseudorandom (raw binary) bytes.
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https://www.php.net/manual/en/function.sodium-crypto-kdf-derive-from-key.php
