SimpleYggGen-CPP/dev/sha512.cpp

// Source: https://github.com/jedisct1/libsodium/tree/1.0.18/src/libsodium/crypto_hash/sha512/cp/hash_sha512_cp.c

#include <limits.h>
#include <stdlib.h>
#include <string.h>

#include "sha512.h"


#define LOAD64_BE(SRC) load64_be(SRC)
static inline uint64_t
load64_be(const uint8_t src[8])
{
#ifdef NATIVE_BIG_ENDIAN
	uint64_t w;
	memcpy(&w, src, sizeof w);
	return w;
#else
	uint64_t w = (uint64_t)src[7];
	w |= (uint64_t)src[6] << 8;
	w |= (uint64_t)src[5] << 16;
	w |= (uint64_t)src[4] << 24;
	w |= (uint64_t)src[3] << 32;
	w |= (uint64_t)src[2] << 40;
	w |= (uint64_t)src[1] << 48;
	w |= (uint64_t)src[0] << 56;
	return w;
#endif
}

#define STORE64_BE(DST, W) store64_be((DST), (W))
static inline void
store64_be(uint8_t dst[8], uint64_t w)
{
#ifdef NATIVE_BIG_ENDIAN
	memcpy(dst, &w, sizeof w);
#else
	dst[7] = (uint8_t)w; w >>= 8;
	dst[6] = (uint8_t)w; w >>= 8;
	dst[5] = (uint8_t)w; w >>= 8;
	dst[4] = (uint8_t)w; w >>= 8;
	dst[3] = (uint8_t)w; w >>= 8;
	dst[2] = (uint8_t)w; w >>= 8;
	dst[1] = (uint8_t)w; w >>= 8;
	dst[0] = (uint8_t)w;
#endif
}

#define ROTR64(X, B) rotr64((X), (B))
static inline uint64_t rotr64(const uint64_t x, const int b)
{
	return (x >> b) | (x << (64 - b));
}

static void be64enc_vect(unsigned char *dst, const uint64_t *src, size_t len)
{
	size_t i;

	for (i = 0; i < len / 8; i++) {
		STORE64_BE(dst + i * 8, src[i]);
	}
}

static void be64dec_vect(uint64_t *dst, const unsigned char *src, size_t len)
{
	size_t i;

	for (i = 0; i < len / 8; i++) {
		dst[i] = LOAD64_BE(src + i * 8);
	}
}

static const uint64_t Krnd[80] = {
	0x428a2f98d728ae22ULL, 0x7137449123ef65cdULL, 0xb5c0fbcfec4d3b2fULL,
	0xe9b5dba58189dbbcULL, 0x3956c25bf348b538ULL, 0x59f111f1b605d019ULL,
	0x923f82a4af194f9bULL, 0xab1c5ed5da6d8118ULL, 0xd807aa98a3030242ULL,
	0x12835b0145706fbeULL, 0x243185be4ee4b28cULL, 0x550c7dc3d5ffb4e2ULL,
	0x72be5d74f27b896fULL, 0x80deb1fe3b1696b1ULL, 0x9bdc06a725c71235ULL,
	0xc19bf174cf692694ULL, 0xe49b69c19ef14ad2ULL, 0xefbe4786384f25e3ULL,
	0x0fc19dc68b8cd5b5ULL, 0x240ca1cc77ac9c65ULL, 0x2de92c6f592b0275ULL,
	0x4a7484aa6ea6e483ULL, 0x5cb0a9dcbd41fbd4ULL, 0x76f988da831153b5ULL,
	0x983e5152ee66dfabULL, 0xa831c66d2db43210ULL, 0xb00327c898fb213fULL,
	0xbf597fc7beef0ee4ULL, 0xc6e00bf33da88fc2ULL, 0xd5a79147930aa725ULL,
	0x06ca6351e003826fULL, 0x142929670a0e6e70ULL, 0x27b70a8546d22ffcULL,
	0x2e1b21385c26c926ULL, 0x4d2c6dfc5ac42aedULL, 0x53380d139d95b3dfULL,
	0x650a73548baf63deULL, 0x766a0abb3c77b2a8ULL, 0x81c2c92e47edaee6ULL,
	0x92722c851482353bULL, 0xa2bfe8a14cf10364ULL, 0xa81a664bbc423001ULL,
	0xc24b8b70d0f89791ULL, 0xc76c51a30654be30ULL, 0xd192e819d6ef5218ULL,
	0xd69906245565a910ULL, 0xf40e35855771202aULL, 0x106aa07032bbd1b8ULL,
	0x19a4c116b8d2d0c8ULL, 0x1e376c085141ab53ULL, 0x2748774cdf8eeb99ULL,
	0x34b0bcb5e19b48a8ULL, 0x391c0cb3c5c95a63ULL, 0x4ed8aa4ae3418acbULL,
	0x5b9cca4f7763e373ULL, 0x682e6ff3d6b2b8a3ULL, 0x748f82ee5defb2fcULL,
	0x78a5636f43172f60ULL, 0x84c87814a1f0ab72ULL, 0x8cc702081a6439ecULL,
	0x90befffa23631e28ULL, 0xa4506cebde82bde9ULL, 0xbef9a3f7b2c67915ULL,
	0xc67178f2e372532bULL, 0xca273eceea26619cULL, 0xd186b8c721c0c207ULL,
	0xeada7dd6cde0eb1eULL, 0xf57d4f7fee6ed178ULL, 0x06f067aa72176fbaULL,
	0x0a637dc5a2c898a6ULL, 0x113f9804bef90daeULL, 0x1b710b35131c471bULL,
	0x28db77f523047d84ULL, 0x32caab7b40c72493ULL, 0x3c9ebe0a15c9bebcULL,
	0x431d67c49c100d4cULL, 0x4cc5d4becb3e42b6ULL, 0x597f299cfc657e2aULL,
	0x5fcb6fab3ad6faecULL, 0x6c44198c4a475817ULL
};

#define Ch(x, y, z) ((x & (y ^ z)) ^ z)
#define Maj(x, y, z) ((x & (y | z)) | (y & z))
#define SHR(x, n) (x >> n)
#define ROTR(x, n) ROTR64(x, n)
#define S0(x) (ROTR(x, 28) ^ ROTR(x, 34) ^ ROTR(x, 39))
#define S1(x) (ROTR(x, 14) ^ ROTR(x, 18) ^ ROTR(x, 41))
#define s0(x) (ROTR(x, 1) ^ ROTR(x, 8) ^ SHR(x, 7))
#define s1(x) (ROTR(x, 19) ^ ROTR(x, 61) ^ SHR(x, 6))

#define RND(a, b, c, d, e, f, g, h, k) \
    h += S1(e) + Ch(e, f, g) + k;      \
    d += h;                            \
    h += S0(a) + Maj(a, b, c);

#define RNDr(S, W, i, ii)                                                   \
    RND(S[(80 - i) % 8], S[(81 - i) % 8], S[(82 - i) % 8], S[(83 - i) % 8], \
        S[(84 - i) % 8], S[(85 - i) % 8], S[(86 - i) % 8], S[(87 - i) % 8], \
        W[i + ii] + Krnd[i + ii])

#define MSCH(W, ii, i) \
    W[i + ii + 16] =   \
        s1(W[i + ii + 14]) + W[i + ii + 9] + s0(W[i + ii + 1]) + W[i + ii]

void crypto_hash_sha512(uint8_t* out, const uint8_t* in)
{
	static const uint64_t sha512_initial_state[8] = {
		0x6a09e667f3bcc908ULL, 0xbb67ae8584caa73bULL, 0x3c6ef372fe94f82bULL,
		0xa54ff53a5f1d36f1ULL, 0x510e527fade682d1ULL, 0x9b05688c2b3e6c1fULL,
		0x1f83d9abfb41bd6bULL, 0x5be0cd19137e2179ULL
	};

	uint64_t S[8];
	memcpy(S, sha512_initial_state, 64);

	uint64_t W[80];
	memset(W + 5, 0, 80);
	be64dec_vect(W, in, 32);
	W[4] = 0x8000000000000000ULL;  // PAD
	W[15] = 0x0000000000000100ULL; // in size: 256 bits

	for (int i = 0; i < 80; i += 16)
	{
		RNDr(S, W, 0, i);
		RNDr(S, W, 1, i);
		RNDr(S, W, 2, i);
		RNDr(S, W, 3, i);
		RNDr(S, W, 4, i);
		RNDr(S, W, 5, i);
		RNDr(S, W, 6, i);
		RNDr(S, W, 7, i);
		RNDr(S, W, 8, i);
		RNDr(S, W, 9, i);
		RNDr(S, W, 10, i);
		RNDr(S, W, 11, i);
		RNDr(S, W, 12, i);
		RNDr(S, W, 13, i);
		RNDr(S, W, 14, i);
		RNDr(S, W, 15, i);
		if (i == 64)
			break;
		MSCH(W, 0, i);
		MSCH(W, 1, i);
		MSCH(W, 2, i);
		MSCH(W, 3, i);
		MSCH(W, 4, i);
		MSCH(W, 5, i);
		MSCH(W, 6, i);
		MSCH(W, 7, i);
		MSCH(W, 8, i);
		MSCH(W, 9, i);
		MSCH(W, 10, i);
		MSCH(W, 11, i);
		MSCH(W, 12, i);
		MSCH(W, 13, i);
		MSCH(W, 14, i);
		MSCH(W, 15, i);
	}
	for (int i = 0; i < 8; i++)
		S[i] += sha512_initial_state[i];
	be64enc_vect(out, S, 64);
}