sodium_crypto_kdf_derive_from_key
Derive a subkey
Description
string sodium_crypto_kdf_derive_from_key(
int $subkey_length,
int $subkey_id,
string $context,
#[\SensitiveParameter]string $key
)
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.