libsodium_sys

Function crypto_kdf_blake2b_derive_from_key

Source 
pub unsafe extern "C" fn crypto_kdf_blake2b_derive_from_key(
    subkey: *mut c_uchar,
    subkey_len: usize,
    subkey_id: u64,
    ctx: *const c_char,
    key: *const c_uchar,
) -> c_int