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// 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
};
// update the state with given number of rounds
void keccakf(uint64_t st[25], int rounds)
{
int round;
uint64_t t, bc[5];
for (round = 0; round < rounds; ++round) {
// Theta
bc[0] = st[0] ^ st[5] ^ st[10] ^ st[15] ^ st[20];
bc[1] = st[1] ^ st[6] ^ st[11] ^ st[16] ^ st[21];
bc[2] = st[2] ^ st[7] ^ st[12] ^ st[17] ^ st[22];
bc[3] = st[3] ^ st[8] ^ st[13] ^ st[18] ^ st[23];
bc[4] = st[4] ^ st[9] ^ st[14] ^ st[19] ^ st[24];
#define THETA(i) { \
t = bc[(i + 4) % 5] ^ ROTL64(bc[(i + 1) % 5], 1); \
st[i ] ^= t; \
st[i + 5] ^= t; \
st[i + 10] ^= t; \
st[i + 15] ^= t; \
st[i + 20] ^= t; \
}
THETA(0);
THETA(1);
THETA(2);
THETA(3);
THETA(4);
// Rho Pi
t = st[1];
st[ 1] = ROTL64(st[ 6], 44);
st[ 6] = ROTL64(st[ 9], 20);
st[ 9] = ROTL64(st[22], 61);
st[22] = ROTL64(st[14], 39);
st[14] = ROTL64(st[20], 18);
st[20] = ROTL64(st[ 2], 62);
st[ 2] = ROTL64(st[12], 43);
st[12] = ROTL64(st[13], 25);
st[13] = ROTL64(st[19], 8);
st[19] = ROTL64(st[23], 56);
st[23] = ROTL64(st[15], 41);
st[15] = ROTL64(st[ 4], 27);
st[ 4] = ROTL64(st[24], 14);
st[24] = ROTL64(st[21], 2);
st[21] = ROTL64(st[ 8], 55);
st[ 8] = ROTL64(st[16], 45);
st[16] = ROTL64(st[ 5], 36);
st[ 5] = ROTL64(st[ 3], 28);
st[ 3] = ROTL64(st[18], 21);
st[18] = ROTL64(st[17], 15);
st[17] = ROTL64(st[11], 10);
st[11] = ROTL64(st[ 7], 6);
st[ 7] = ROTL64(st[10], 3);
st[10] = ROTL64(t, 1);
// Chi
#define CHI(j) { \
const uint64_t st0 = st[j ]; \
const uint64_t st1 = st[j + 1]; \
const uint64_t st2 = st[j + 2]; \
const uint64_t st3 = st[j + 3]; \
const uint64_t st4 = st[j + 4]; \
st[j ] ^= ~st1 & st2; \
st[j + 1] ^= ~st2 & st3; \
st[j + 2] ^= ~st3 & st4; \
st[j + 3] ^= ~st4 & st0; \
st[j + 4] ^= ~st0 & st1; \
}
CHI( 0);
CHI( 5);
CHI(10);
CHI(15);
CHI(20);
// 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++) {
uint64_t ina;
memcpy(&ina, in + i * 8, 8);
st[i] ^= swap64le(ina);
}
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");
}
if (inlen > 0)
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 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;
}
while (inlen >= KECCAK_BLOCKLEN) {
memcpy(ctx->message, in, KECCAK_BLOCKLEN);
KECCAK_PROCESS_BLOCK(ctx->hash, ctx->message);
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));
}
}
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