File size: 821 Bytes
fa0b996 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 | defmodule Alice.Hasher do
@moduledoc """
Alice's implementation of the integer hashing challenge.
Uses built-in crypto functions for SHA-256.
"""
@doc """
Computes SHA-256 hash of a string.
"""
def sha256(input) do
input
|> :crypto.hash(:sha256)
|> Base.encode16(case: :lower)
end
@doc """
Sums a list of integers.
"""
def sum_list(list) do
Enum.reduce(list, 0, &(&1 + &2))
end
@doc """
Computes factorial recursively.
"""
def factorial(0), do: 1
def factorial(n), do: n * factorial(n - 1)
@doc """
Main entry point that routes to the appropriate function.
"""
def solve(:sha256, input), do: sha256(input)
def solve(:sum_list, input), do: sum_list(input)
def solve(:factorial, input), do: factorial(input)
def solve(_challenge, _input), do: nil
end
|