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(** {{:https://tools.ietf.org/html/rfc7914}
The scrypt Password-Based Key Derivation Function}
specifies the password-based key derivation function scrypt. The
function derives one or more secret keys from a secret string.
It is based on memory-hard functions which offer added protection
against attacks using custom hardware. *)
(** [scrypt_kdf password salt n r p dk_len] is [dk], the derived key
of [dk_len] octets.
[n], the cost parameter, must be larger than 1 and a power of 2.
[p], the parallelization parameter, must be a possitive integer
and less than or equal to 2^32 - 1 / (4 * r)
@raise Invalid_argument when either [n], [p] or [dk_len] are not
valid *)
val scrypt : password:string -> salt:string -> n:int -> r:int -> p:int -> dk_len:int32 -> string
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