SHA256.cry

/*
   Copyright (c) 2018, Galois Inc.
   www.cryptol.net
   You can freely use this source code for educational purposes.
*/

module Primitive::Keyless::Hash::SHA256 = Primitive::Keyless::Hash::SHA where

type w = 32

type digest_size = 256

type j = 64

H0 = [ 0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a,
       0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19]

K = [ 0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
      0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
      0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
      0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
      0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
      0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
      0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
      0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2]

SIGMA_0 x = (x >>> 2) ^ (x >>> 13) ^ (x >>> 22)

SIGMA_1 x = (x >>> 6) ^ (x >>> 11) ^ (x >>> 25)

sigma_0 x = (x >>> 7) ^ (x >>> 18) ^ (x >> 3)

sigma_1 x = (x >>> 17) ^ (x >>> 19) ^ (x >> 10)