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(* @needs Value *)
type hash = Digestif.SHA256.t
let size = 256 / 8
let compare h1 h2 = Digestif.SHA256.unsafe_compare h1 h2 |> Ordering.of_int
let hash_of_value (v : Value.value) =
Representation.(blob_of_value v |> bytes_of_blob) |> Digestif.SHA256.digest_bytes
let hash_of_bytes bytes = Digestif.SHA256.digest_bytes bytes
let hash_of_blob blob = Representation.bytes_of_blob blob |> Digestif.SHA256.digest_bytes
let to_raw_string hash = Digestif.SHA256.to_raw_string hash
let of_raw_string str = Digestif.SHA256.of_raw_string str
let hash_equals = Digestif.SHA256.equal
let bytes_of_hash (h : hash) = Bytes.of_string (Digestif.SHA256.to_raw_string h)
let power_of_two p =
let b = Bytes.make 32 '\x00' in
let byte = 31 - (p / 8) in
Bytes.set b byte (Char.chr (1 lsl (p mod 8)));
Bytes.unsafe_to_string b
let pick n hash =
let threshold = Digestif.SHA256.of_raw_string (power_of_two (256 - n)) in
compare hash threshold = Ordering.Smaller
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