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lib/crypto/utils.ex
defmodule Tezex.Crypto.Utils do
@moduledoc false
@spec mod(integer, integer) :: non_neg_integer
def mod(x, n) do
case rem(x, n) do
r when r < 0 -> r + n
r -> r
end
end
@spec mod_add(integer, integer, integer) :: non_neg_integer
def mod_add(left, right, modulus) do
mod(left + right, modulus)
end
@spec mod_sub(integer, integer, integer) :: non_neg_integer
def mod_sub(left, right, modulus) do
mod(left - right, modulus)
end
def ipow(base, p, acc \\ 1)
def ipow(base, p, acc) when p > 0 do
ipow(base, p - 1, base * acc)
end
def ipow(_base, _p, acc) do
acc
end
@spec number_from_string(binary) :: integer
def number_from_string(string) do
{parsed_int, ""} =
string
|> Base.encode16()
|> Integer.parse(16)
parsed_int
end
end