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+/*
+ * Ouroboros - Copyright (C) 2016 - 2017
+ *
+ * SHA3 algorithm
+ *
+ * This implementation is adapted and redistributed from the RHASH
+ * project
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License
+ * version 2.1 as published by the Free Software Foundation.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+/* sha3.c - an implementation of Secure Hash Algorithm 3 (Keccak).
+ * based on the
+ * The Keccak SHA-3 submission. Submission to NIST (Round 3), 2011
+ * by Guido Bertoni, Joan Daemen, Michaël Peeters and Gilles Van Assche
+ *
+ * Copyright: 2013 Aleksey Kravchenko <rhash.admin@gmail.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. Use this program at your own risk!
+ */
+
+#include <assert.h>
+#include <string.h>
+
+#include "sha3.h"
+#include "byte_order.h"
+
+#define NumberOfRounds 24
+
+/* SHA3 (Keccak) constants for 24 rounds */
+static uint64_t keccak_round_constants[NumberOfRounds] = {
+ I64(0x0000000000000001), I64(0x0000000000008082),
+ I64(0x800000000000808A), I64(0x8000000080008000),
+ I64(0x000000000000808B), I64(0x0000000080000001),
+ I64(0x8000000080008081), I64(0x8000000000008009),
+ I64(0x000000000000008A), I64(0x0000000000000088),
+ I64(0x0000000080008009), I64(0x000000008000000A),
+ I64(0x000000008000808B), I64(0x800000000000008B),
+ I64(0x8000000000008089), I64(0x8000000000008003),
+ I64(0x8000000000008002), I64(0x8000000000000080),
+ I64(0x000000000000800A), I64(0x800000008000000A),
+ I64(0x8000000080008081), I64(0x8000000000008080),
+ I64(0x0000000080000001), I64(0x8000000080008008)
+};
+
+static void rhash_keccak_init(struct sha3_ctx * ctx,
+ unsigned bits)
+{
+ /* NB: The Keccak capacity parameter = bits * 2 */
+ unsigned rate = 1600 - bits * 2;
+
+ memset(ctx, 0, sizeof(struct sha3_ctx));
+ ctx->block_size = rate / 8;
+ assert(rate <= 1600 && (rate % 64) == 0);
+}
+
+void rhash_sha3_224_init(struct sha3_ctx * ctx)
+{
+ rhash_keccak_init(ctx, 224);
+}
+
+void rhash_sha3_256_init(struct sha3_ctx * ctx)
+{
+ rhash_keccak_init(ctx, 256);
+}
+void rhash_sha3_384_init(struct sha3_ctx * ctx)
+{
+ rhash_keccak_init(ctx, 384);
+}
+
+void rhash_sha3_512_init(struct sha3_ctx * ctx)
+{
+ rhash_keccak_init(ctx, 512);
+}
+
+static void keccak_theta(uint64_t * A)
+{
+ unsigned int x;
+ uint64_t C[5];
+ uint64_t D[5];
+
+ for (x = 0; x < 5; x++)
+ C[x] = A[x] ^ A[x + 5] ^ A[x + 10] ^ A[x + 15] ^ A[x + 20];
+
+ D[0] = ROTL64(C[1], 1) ^ C[4];
+ D[1] = ROTL64(C[2], 1) ^ C[0];
+ D[2] = ROTL64(C[3], 1) ^ C[1];
+ D[3] = ROTL64(C[4], 1) ^ C[2];
+ D[4] = ROTL64(C[0], 1) ^ C[3];
+
+ for (x = 0; x < 5; x++) {
+ A[x] ^= D[x];
+ A[x + 5] ^= D[x];
+ A[x + 10] ^= D[x];
+ A[x + 15] ^= D[x];
+ A[x + 20] ^= D[x];
+ }
+}
+
+static void keccak_pi(uint64_t * A)
+{
+ uint64_t A1;
+ A1 = A[1];
+ A[ 1] = A[ 6];
+ A[ 6] = A[ 9];
+ A[ 9] = A[22];
+ A[22] = A[14];
+ A[14] = A[20];
+ A[20] = A[ 2];
+ A[ 2] = A[12];
+ A[12] = A[13];
+ A[13] = A[19];
+ A[19] = A[23];
+ A[23] = A[15];
+ A[15] = A[ 4];
+ A[ 4] = A[24];
+ A[24] = A[21];
+ A[21] = A[ 8];
+ A[ 8] = A[16];
+ A[16] = A[ 5];
+ A[ 5] = A[ 3];
+ A[ 3] = A[18];
+ A[18] = A[17];
+ A[17] = A[11];
+ A[11] = A[ 7];
+ A[ 7] = A[10];
+ A[10] = A1;
+ /* note: A[ 0] is left as is */
+}
+
+static void keccak_chi(uint64_t * A)
+{
+ int i;
+ for (i = 0; i < 25; i += 5) {
+ uint64_t A0 = A[0 + i];
+ uint64_t A1 = A[1 + i];
+ A[0 + i] ^= ~A1 & A[2 + i];
+ A[1 + i] ^= ~A[2 + i] & A[3 + i];
+ A[2 + i] ^= ~A[3 + i] & A[4 + i];
+ A[3 + i] ^= ~A[4 + i] & A0;
+ A[4 + i] ^= ~A0 & A1;
+ }
+}
+
+static void rhash_sha3_permutation(uint64_t * state)
+{
+ int round;
+ for (round = 0; round < NumberOfRounds; round++) {
+ keccak_theta(state);
+ /* apply Keccak rho() transformation */
+ state[ 1] = ROTL64(state[ 1], 1);
+ state[ 2] = ROTL64(state[ 2], 62);
+ state[ 3] = ROTL64(state[ 3], 28);
+ state[ 4] = ROTL64(state[ 4], 27);
+ state[ 5] = ROTL64(state[ 5], 36);
+ state[ 6] = ROTL64(state[ 6], 44);
+ state[ 7] = ROTL64(state[ 7], 6);
+ state[ 8] = ROTL64(state[ 8], 55);
+ state[ 9] = ROTL64(state[ 9], 20);
+ state[10] = ROTL64(state[10], 3);
+ state[11] = ROTL64(state[11], 10);
+ state[12] = ROTL64(state[12], 43);
+ state[13] = ROTL64(state[13], 25);
+ state[14] = ROTL64(state[14], 39);
+ state[15] = ROTL64(state[15], 41);
+ state[16] = ROTL64(state[16], 45);
+ state[17] = ROTL64(state[17], 15);
+ state[18] = ROTL64(state[18], 21);
+ state[19] = ROTL64(state[19], 8);
+ state[20] = ROTL64(state[20], 18);
+ state[21] = ROTL64(state[21], 2);
+ state[22] = ROTL64(state[22], 61);
+ state[23] = ROTL64(state[23], 56);
+ state[24] = ROTL64(state[24], 14);
+
+ keccak_pi(state);
+ keccak_chi(state);
+
+ /* apply iota(state, round) */
+ *state ^= keccak_round_constants[round];
+ }
+}
+
+static void rhash_sha3_process_block(uint64_t hash[25],
+ const uint64_t * block,
+ size_t block_size)
+{
+ /* expanded loop */
+ hash[ 0] ^= le2me_64(block[ 0]);
+ hash[ 1] ^= le2me_64(block[ 1]);
+ hash[ 2] ^= le2me_64(block[ 2]);
+ hash[ 3] ^= le2me_64(block[ 3]);
+ hash[ 4] ^= le2me_64(block[ 4]);
+ hash[ 5] ^= le2me_64(block[ 5]);
+ hash[ 6] ^= le2me_64(block[ 6]);
+ hash[ 7] ^= le2me_64(block[ 7]);
+ hash[ 8] ^= le2me_64(block[ 8]);
+ /* if not sha3-512 */
+ if (block_size > 72) {
+ hash[ 9] ^= le2me_64(block[ 9]);
+ hash[10] ^= le2me_64(block[10]);
+ hash[11] ^= le2me_64(block[11]);
+ hash[12] ^= le2me_64(block[12]);
+ /* if not sha3-384 */
+ if (block_size > 104) {
+ hash[13] ^= le2me_64(block[13]);
+ hash[14] ^= le2me_64(block[14]);
+ hash[15] ^= le2me_64(block[15]);
+ hash[16] ^= le2me_64(block[16]);
+ /* if not sha3-256 */
+ if (block_size > 136) {
+ hash[17] ^= le2me_64(block[17]);
+#ifdef FULL_SHA3_FAMILY_SUPPORT
+ /* if not sha3-224 */
+ if (block_size > 144) {
+ hash[18] ^= le2me_64(block[18]);
+ hash[19] ^= le2me_64(block[19]);
+ hash[20] ^= le2me_64(block[20]);
+ hash[21] ^= le2me_64(block[21]);
+ hash[22] ^= le2me_64(block[22]);
+ hash[23] ^= le2me_64(block[23]);
+ hash[24] ^= le2me_64(block[24]);
+ }
+#endif
+ }
+ }
+ }
+ /* make a permutation of the hash */
+ rhash_sha3_permutation(hash);
+}
+
+#define SHA3_FINALIZED 0x80000000
+
+void rhash_sha3_update(struct sha3_ctx * ctx,
+ const uint8_t * msg,
+ size_t size)
+{
+ size_t idx = (size_t) ctx->rest;
+ size_t block_size = (size_t) ctx->block_size;
+
+ if (ctx->rest & SHA3_FINALIZED) return;
+ ctx->rest = (unsigned) ((ctx->rest + size) % block_size);
+
+ /* fill partial block */
+ if (idx) {
+ size_t left = block_size - idx;
+ memcpy((uint8_t *) ctx->message + idx, msg,
+ (size < left ? size : left));
+ if (size < left) return;
+
+ /* process partial block */
+ rhash_sha3_process_block(ctx->hash, ctx->message, block_size);
+ msg += left;
+ size -= left;
+ }
+
+ while (size >= block_size) {
+ uint64_t * aligned_message_block;
+ if (IS_ALIGNED_64(msg)) {
+ /*
+ * the most common case is processing of an already
+ * aligned message without copying it
+ */
+ aligned_message_block = (uint64_t *) msg;
+ } else {
+ memcpy(ctx->message, msg, block_size);
+ aligned_message_block = ctx->message;
+ }
+
+ rhash_sha3_process_block(ctx->hash, aligned_message_block,
+ block_size);
+ msg += block_size;
+ size -= block_size;
+ }
+
+ if (size)
+ memcpy(ctx->message, msg, size);
+}
+
+void rhash_sha3_final(struct sha3_ctx * ctx,
+ uint8_t * res)
+{
+ size_t digest_length = 100 - ctx->block_size / 2;
+ const size_t block_size = ctx->block_size;
+
+ if (!(ctx->rest & SHA3_FINALIZED)) {
+ /* clear the rest of the data queue */
+ memset((uint8_t *) ctx->message + ctx->rest, 0,
+ block_size - ctx->rest);
+ ((uint8_t *) ctx->message)[ctx->rest] |= 0x06;
+ ((uint8_t *) ctx->message)[block_size - 1] |= 0x80;
+
+ /* process final block */
+ rhash_sha3_process_block(ctx->hash, ctx->message, block_size);
+ ctx->rest = SHA3_FINALIZED;
+ }
+
+ assert(block_size > digest_length);
+
+ if (res != NULL)
+ me64_to_le_str(res, ctx->hash, digest_length);
+}
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