PHP 8.1.0 RC 2 available for testing

sodium_crypto_kdf_derive_from_key

(PHP 7 >= 7.2.0, PHP 8)

sodium_crypto_kdf_derive_from_keyDerive 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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