sodium_crypto_kdf_derive_from_key
(PHP 7 >= 7.2.0, PHP 8)
sodium_crypto_kdf_derive_from_key — Derive a subkey
Description
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.