mirror of
https://git.wownero.com/wownero/wownero.git
synced 2024-08-15 01:03:23 +00:00
214 lines
5.8 KiB
C
214 lines
5.8 KiB
C
// keccak.c
|
|
// 19-Nov-11 Markku-Juhani O. Saarinen <mjos@iki.fi>
|
|
// A baseline Keccak (3rd round) implementation.
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
#include "int-util.h"
|
|
#include "hash-ops.h"
|
|
#include "keccak.h"
|
|
|
|
static void local_abort(const char *msg)
|
|
{
|
|
fprintf(stderr, "%s\n", msg);
|
|
#ifdef NDEBUG
|
|
_exit(1);
|
|
#else
|
|
abort();
|
|
#endif
|
|
}
|
|
|
|
const uint64_t keccakf_rndc[24] =
|
|
{
|
|
0x0000000000000001, 0x0000000000008082, 0x800000000000808a,
|
|
0x8000000080008000, 0x000000000000808b, 0x0000000080000001,
|
|
0x8000000080008081, 0x8000000000008009, 0x000000000000008a,
|
|
0x0000000000000088, 0x0000000080008009, 0x000000008000000a,
|
|
0x000000008000808b, 0x800000000000008b, 0x8000000000008089,
|
|
0x8000000000008003, 0x8000000000008002, 0x8000000000000080,
|
|
0x000000000000800a, 0x800000008000000a, 0x8000000080008081,
|
|
0x8000000000008080, 0x0000000080000001, 0x8000000080008008
|
|
};
|
|
|
|
const int keccakf_rotc[24] =
|
|
{
|
|
1, 3, 6, 10, 15, 21, 28, 36, 45, 55, 2, 14,
|
|
27, 41, 56, 8, 25, 43, 62, 18, 39, 61, 20, 44
|
|
};
|
|
|
|
const int keccakf_piln[24] =
|
|
{
|
|
10, 7, 11, 17, 18, 3, 5, 16, 8, 21, 24, 4,
|
|
15, 23, 19, 13, 12, 2, 20, 14, 22, 9, 6, 1
|
|
};
|
|
|
|
// update the state with given number of rounds
|
|
|
|
void keccakf(uint64_t st[25], int rounds)
|
|
{
|
|
int i, j, round;
|
|
uint64_t t, bc[5];
|
|
|
|
for (round = 0; round < rounds; round++) {
|
|
|
|
// Theta
|
|
for (i = 0; i < 5; i++)
|
|
bc[i] = st[i] ^ st[i + 5] ^ st[i + 10] ^ st[i + 15] ^ st[i + 20];
|
|
|
|
for (i = 0; i < 5; i++) {
|
|
t = bc[(i + 4) % 5] ^ ROTL64(bc[(i + 1) % 5], 1);
|
|
for (j = 0; j < 25; j += 5)
|
|
st[j + i] ^= t;
|
|
}
|
|
|
|
// Rho Pi
|
|
t = st[1];
|
|
for (i = 0; i < 24; i++) {
|
|
j = keccakf_piln[i];
|
|
bc[0] = st[j];
|
|
st[j] = ROTL64(t, keccakf_rotc[i]);
|
|
t = bc[0];
|
|
}
|
|
|
|
// Chi
|
|
for (j = 0; j < 25; j += 5) {
|
|
for (i = 0; i < 5; i++)
|
|
bc[i] = st[j + i];
|
|
for (i = 0; i < 5; i++)
|
|
st[j + i] ^= (~bc[(i + 1) % 5]) & bc[(i + 2) % 5];
|
|
}
|
|
|
|
// Iota
|
|
st[0] ^= keccakf_rndc[round];
|
|
}
|
|
}
|
|
|
|
// compute a keccak hash (md) of given byte length from "in"
|
|
typedef uint64_t state_t[25];
|
|
|
|
void keccak(const uint8_t *in, size_t inlen, uint8_t *md, int mdlen)
|
|
{
|
|
state_t st;
|
|
uint8_t temp[144];
|
|
size_t i, rsiz, rsizw;
|
|
|
|
static_assert(HASH_DATA_AREA <= sizeof(temp), "Bad keccak preconditions");
|
|
if (mdlen <= 0 || (mdlen > 100 && sizeof(st) != (size_t)mdlen))
|
|
{
|
|
local_abort("Bad keccak use");
|
|
}
|
|
|
|
rsiz = sizeof(state_t) == mdlen ? HASH_DATA_AREA : 200 - 2 * mdlen;
|
|
rsizw = rsiz / 8;
|
|
|
|
memset(st, 0, sizeof(st));
|
|
|
|
for ( ; inlen >= rsiz; inlen -= rsiz, in += rsiz) {
|
|
for (i = 0; i < rsizw; i++)
|
|
st[i] ^= swap64le(((uint64_t *) in)[i]);
|
|
keccakf(st, KECCAK_ROUNDS);
|
|
}
|
|
|
|
// last block and padding
|
|
if (inlen + 1 >= sizeof(temp) || inlen > rsiz || rsiz - inlen + inlen + 1 >= sizeof(temp) || rsiz == 0 || rsiz - 1 >= sizeof(temp) || rsizw * 8 > sizeof(temp))
|
|
{
|
|
local_abort("Bad keccak use");
|
|
}
|
|
|
|
memcpy(temp, in, inlen);
|
|
temp[inlen++] = 1;
|
|
memset(temp + inlen, 0, rsiz - inlen);
|
|
temp[rsiz - 1] |= 0x80;
|
|
|
|
for (i = 0; i < rsizw; i++)
|
|
st[i] ^= swap64le(((uint64_t *) temp)[i]);
|
|
|
|
keccakf(st, KECCAK_ROUNDS);
|
|
|
|
if (((size_t)mdlen % sizeof(uint64_t)) != 0)
|
|
{
|
|
local_abort("Bad keccak use");
|
|
}
|
|
memcpy_swap64le(md, st, mdlen/sizeof(uint64_t));
|
|
}
|
|
|
|
void keccak1600(const uint8_t *in, size_t inlen, uint8_t *md)
|
|
{
|
|
keccak(in, inlen, md, sizeof(state_t));
|
|
}
|
|
|
|
#define KECCAK_FINALIZED 0x80000000
|
|
#define KECCAK_BLOCKLEN 136
|
|
#define KECCAK_WORDS 17
|
|
#define KECCAK_DIGESTSIZE 32
|
|
#define IS_ALIGNED_64(p) (0 == (7 & ((const char*)(p) - (const char*)0)))
|
|
#define KECCAK_PROCESS_BLOCK(st, block) { \
|
|
for (int i_ = 0; i_ < KECCAK_WORDS; i_++){ \
|
|
((st))[i_] ^= swap64le(((block))[i_]); \
|
|
}; \
|
|
keccakf(st, KECCAK_ROUNDS); }
|
|
|
|
|
|
void keccak_init(KECCAK_CTX * ctx){
|
|
memset(ctx, 0, sizeof(KECCAK_CTX));
|
|
}
|
|
|
|
void keccak_update(KECCAK_CTX * ctx, const uint8_t *in, size_t inlen){
|
|
if (ctx->rest & KECCAK_FINALIZED) {
|
|
local_abort("Bad keccak use");
|
|
}
|
|
|
|
const size_t idx = ctx->rest;
|
|
ctx->rest = (ctx->rest + inlen) % KECCAK_BLOCKLEN;
|
|
|
|
// fill partial block
|
|
if (idx) {
|
|
size_t left = KECCAK_BLOCKLEN - idx;
|
|
memcpy((char*)ctx->message + idx, in, (inlen < left ? inlen : left));
|
|
if (inlen < left) return;
|
|
|
|
KECCAK_PROCESS_BLOCK(ctx->hash, ctx->message);
|
|
|
|
in += left;
|
|
inlen -= left;
|
|
}
|
|
|
|
const bool is_aligned = IS_ALIGNED_64(in);
|
|
while (inlen >= KECCAK_BLOCKLEN) {
|
|
const uint64_t* aligned_message_block;
|
|
if (is_aligned) {
|
|
aligned_message_block = (uint64_t*)in;
|
|
} else {
|
|
memcpy(ctx->message, in, KECCAK_BLOCKLEN);
|
|
aligned_message_block = ctx->message;
|
|
}
|
|
|
|
KECCAK_PROCESS_BLOCK(ctx->hash, aligned_message_block);
|
|
in += KECCAK_BLOCKLEN;
|
|
inlen -= KECCAK_BLOCKLEN;
|
|
}
|
|
if (inlen) {
|
|
memcpy(ctx->message, in, inlen);
|
|
}
|
|
}
|
|
|
|
void keccak_finish(KECCAK_CTX * ctx, uint8_t *md){
|
|
if (!(ctx->rest & KECCAK_FINALIZED))
|
|
{
|
|
// clear the rest of the data queue
|
|
memset((char*)ctx->message + ctx->rest, 0, KECCAK_BLOCKLEN - ctx->rest);
|
|
((char*)ctx->message)[ctx->rest] |= 0x01;
|
|
((char*)ctx->message)[KECCAK_BLOCKLEN - 1] |= 0x80;
|
|
|
|
// process final block
|
|
KECCAK_PROCESS_BLOCK(ctx->hash, ctx->message);
|
|
ctx->rest = KECCAK_FINALIZED; // mark context as finalized
|
|
}
|
|
|
|
static_assert(KECCAK_BLOCKLEN > KECCAK_DIGESTSIZE, "");
|
|
static_assert(KECCAK_DIGESTSIZE % sizeof(uint64_t) == 0, "");
|
|
if (md) {
|
|
memcpy_swap64le(md, ctx->hash, KECCAK_DIGESTSIZE / sizeof(uint64_t));
|
|
}
|
|
}
|