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    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,
        #[\SensitiveParameter] 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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