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sodium_crypto_kdf_derive_from_key

PHP function Edit on GitHub ✎

(PHP 7 >= 7.2.0, PHP 8)

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.

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.

A string of pseudorandom (raw binary) bytes.