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508 lines
12 KiB
C
508 lines
12 KiB
C
/* @(#)sha3.c 1.4 15/12/27 2015 J. Schilling */
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#include <schily/mconfig.h>
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#ifndef lint
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static UConst char sccsid[] =
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"@(#)sha3.c 1.4 15/12/27 2015 J. Schilling";
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#endif
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/*
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* SHA3 hash code taken from
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* https://github.com/rhash/RHash/tree/master/librhash
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*
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* Portions Copyright (c) 2015 J. Schilling
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*/
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/*
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* sha3.c - an implementation of Secure Hash Algorithm 3 (Keccak).
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* based on the
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* The Keccak SHA-3 submission. Submission to NIST (Round 3), 2011
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* by Guido Bertoni, Joan Daemen, Michaël Peeters and Gilles Van Assche
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*
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* Copyright: 2013 Aleksey Kravchenko <rhash.admin@gmail.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. Use this program at your own risk!
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*/
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#include <schily/assert.h>
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#include <schily/string.h>
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#include "byte_order.h"
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#include <schily/sha3.h>
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#ifdef HAVE_LONGLONG
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#if !defined(HAVE_MEMCPY) || !defined(HAVE_MEMSET)
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#include <schily/schily.h>
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#endif
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#if !defined(HAVE_MEMCPY) && !defined(memcpy)
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#define memcpy(s1, s2, n) movebytes(s2, s1, n)
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#endif
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#if !defined(HAVE_MEMSET) && !defined(memset)
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#define memset(s, c, n) fillbytes(s, n, c)
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#endif
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static void rhash_keccak_init __PR((sha3_ctx *ctx, unsigned bits));
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static void keccak_theta __PR((UInt64_t *A));
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static void keccak_pi __PR((UInt64_t *A));
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static void keccak_chi __PR((UInt64_t *A));
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static void rhash_sha3_permutation __PR((UInt64_t *state));
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static void rhash_sha3_process_block __PR((UInt64_t hash[25],
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const UInt64_t *block,
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size_t block_size));
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/*
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* The Cygwin compile environment incorrectly implements #pragma weak.
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* The weak symbols are only defined as local symbols making it impossible
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* to use them from outside the scope of this source file.
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* A platform that allows linking with global symbols has HAVE_LINK_WEAK
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* defined.
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*/
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#if defined(HAVE_PRAGMA_WEAK) && defined(HAVE_LINK_WEAK)
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#pragma weak SHA3_224_Init = rhash_sha3_224_init
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#pragma weak SHA3_256_Init = rhash_sha3_256_init
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#pragma weak SHA3_384_Init = rhash_sha3_384_init
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#pragma weak SHA3_512_Init = rhash_sha3_512_init
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#pragma weak SHA3_Update = rhash_sha3_update
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#else
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void SHA3_224_Init __PR((SHA3_CTX *ctx));
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void SHA3_256_Init __PR((SHA3_CTX *ctx));
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void SHA3_384_Init __PR((SHA3_CTX *ctx));
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void SHA3_512_Init __PR((SHA3_CTX *ctx));
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void SHA3_Update __PR((SHA3_CTX *ctx,
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const unsigned char *msg,
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size_t size));
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void
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SHA3_224_Init(ctx)
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SHA3_CTX *ctx;
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{
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rhash_sha3_224_init(ctx);
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}
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void
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SHA3_256_Init(ctx)
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SHA3_CTX *ctx;
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{
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rhash_sha3_256_init(ctx);
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}
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void
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SHA3_384_Init(ctx)
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SHA3_CTX *ctx;
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{
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rhash_sha3_384_init(ctx);
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}
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void
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SHA3_512_Init(ctx)
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SHA3_CTX *ctx;
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{
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rhash_sha3_512_init(ctx);
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}
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void
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SHA3_Update(ctx, msg, size)
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SHA3_CTX *ctx;
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const unsigned char *msg;
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size_t size;
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{
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rhash_sha3_update(ctx, msg, size);
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}
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#endif /* defined(HAVE_PRAGMA_WEAK) && defined(HAVE_LINK_WEAK) */
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/* constants */
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#define NumberOfRounds 24
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/* SHA3 (Keccak) constants for 24 rounds */
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static UInt64_t keccak_round_constants[NumberOfRounds] = {
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UI64(0x0000000000000001), UI64(0x0000000000008082),
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UI64(0x800000000000808A), UI64(0x8000000080008000),
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UI64(0x000000000000808B), UI64(0x0000000080000001),
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UI64(0x8000000080008081), UI64(0x8000000000008009),
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UI64(0x000000000000008A), UI64(0x0000000000000088),
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UI64(0x0000000080008009), UI64(0x000000008000000A),
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UI64(0x000000008000808B), UI64(0x800000000000008B),
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UI64(0x8000000000008089), UI64(0x8000000000008003),
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UI64(0x8000000000008002), UI64(0x8000000000000080),
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UI64(0x000000000000800A), UI64(0x800000008000000A),
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UI64(0x8000000080008081), UI64(0x8000000000008080),
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UI64(0x0000000080000001), UI64(0x8000000080008008)
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};
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/* Initializing a sha3 context for given number of output bits */
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static void
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rhash_keccak_init(ctx, bits)
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sha3_ctx *ctx;
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unsigned bits;
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{
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/* NB: The Keccak capacity parameter = bits * 2 */
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unsigned rate = 1600 - bits * 2;
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memset(ctx, 0, sizeof (sha3_ctx));
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ctx->block_size = rate / 8;
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assert(rate <= 1600 && (rate % 64) == 0);
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}
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/*
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* Initialize context before calculating hash.
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*
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* @param ctx context to initialize
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*/
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void
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rhash_sha3_224_init(ctx)
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sha3_ctx *ctx;
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{
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rhash_keccak_init(ctx, 224);
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}
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/*
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* Initialize context before calculating hash.
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*
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* @param ctx context to initialize
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*/
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void
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rhash_sha3_256_init(ctx)
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sha3_ctx *ctx;
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{
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rhash_keccak_init(ctx, 256);
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}
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/*
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* Initialize context before calculating hash.
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*
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* @param ctx context to initialize
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*/
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void
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rhash_sha3_384_init(ctx)
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sha3_ctx *ctx;
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{
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rhash_keccak_init(ctx, 384);
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}
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/*
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* Initialize context before calculating hash.
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*
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* @param ctx context to initialize
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*/
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void
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rhash_sha3_512_init(ctx)
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sha3_ctx *ctx;
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{
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rhash_keccak_init(ctx, 512);
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}
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/* Keccak theta() transformation */
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static void
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keccak_theta(A)
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UInt64_t *A;
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{
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unsigned int x;
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UInt64_t C[5], D[5];
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for (x = 0; x < 5; x++) {
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C[x] = A[x] ^ A[x + 5] ^ A[x + 10] ^ A[x + 15] ^ A[x + 20];
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}
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D[0] = ROTL64(C[1], 1) ^ C[4];
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D[1] = ROTL64(C[2], 1) ^ C[0];
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D[2] = ROTL64(C[3], 1) ^ C[1];
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D[3] = ROTL64(C[4], 1) ^ C[2];
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D[4] = ROTL64(C[0], 1) ^ C[3];
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for (x = 0; x < 5; x++) {
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A[x] ^= D[x];
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A[x + 5] ^= D[x];
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A[x + 10] ^= D[x];
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A[x + 15] ^= D[x];
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A[x + 20] ^= D[x];
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}
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}
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/* Keccak pi() transformation */
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static void
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keccak_pi(A)
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UInt64_t *A;
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{
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UInt64_t A1;
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A1 = A[1];
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A[ 1] = A[ 6];
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A[ 6] = A[ 9];
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A[ 9] = A[22];
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A[22] = A[14];
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A[14] = A[20];
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A[20] = A[ 2];
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A[ 2] = A[12];
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A[12] = A[13];
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A[13] = A[19];
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A[19] = A[23];
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A[23] = A[15];
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A[15] = A[ 4];
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A[ 4] = A[24];
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A[24] = A[21];
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A[21] = A[ 8];
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A[ 8] = A[16];
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A[16] = A[ 5];
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A[ 5] = A[ 3];
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A[ 3] = A[18];
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A[18] = A[17];
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A[17] = A[11];
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A[11] = A[ 7];
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A[ 7] = A[10];
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A[10] = A1;
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/* note: A[ 0] is left as is */
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}
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/* Keccak chi() transformation */
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static void
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keccak_chi(A)
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UInt64_t *A;
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{
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int i;
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for (i = 0; i < 25; i += 5) {
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UInt64_t A0 = A[0 + i], A1 = A[1 + i];
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A[0 + i] ^= ~A1 & A[2 + i];
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A[1 + i] ^= ~A[2 + i] & A[3 + i];
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A[2 + i] ^= ~A[3 + i] & A[4 + i];
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A[3 + i] ^= ~A[4 + i] & A0;
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A[4 + i] ^= ~A0 & A1;
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}
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}
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static void
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rhash_sha3_permutation(state)
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UInt64_t *state;
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{
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int round;
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for (round = 0; round < NumberOfRounds; round++)
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{
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keccak_theta(state);
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/* apply Keccak rho() transformation */
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state[ 1] = ROTL64(state[ 1], 1);
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state[ 2] = ROTL64(state[ 2], 62);
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state[ 3] = ROTL64(state[ 3], 28);
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state[ 4] = ROTL64(state[ 4], 27);
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state[ 5] = ROTL64(state[ 5], 36);
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state[ 6] = ROTL64(state[ 6], 44);
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state[ 7] = ROTL64(state[ 7], 6);
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state[ 8] = ROTL64(state[ 8], 55);
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state[ 9] = ROTL64(state[ 9], 20);
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state[10] = ROTL64(state[10], 3);
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state[11] = ROTL64(state[11], 10);
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state[12] = ROTL64(state[12], 43);
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state[13] = ROTL64(state[13], 25);
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state[14] = ROTL64(state[14], 39);
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state[15] = ROTL64(state[15], 41);
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state[16] = ROTL64(state[16], 45);
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state[17] = ROTL64(state[17], 15);
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state[18] = ROTL64(state[18], 21);
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state[19] = ROTL64(state[19], 8);
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state[20] = ROTL64(state[20], 18);
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state[21] = ROTL64(state[21], 2);
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state[22] = ROTL64(state[22], 61);
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state[23] = ROTL64(state[23], 56);
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state[24] = ROTL64(state[24], 14);
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keccak_pi(state);
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keccak_chi(state);
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/* apply iota(state, round) */
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*state ^= keccak_round_constants[round];
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}
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}
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/*
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* The core transformation. Process the specified block of data.
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*
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* @param hash the algorithm state
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* @param block the message block to process
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* @param block_size the size of the processed block in bytes
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*/
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static void
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rhash_sha3_process_block(hash, block, block_size)
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UInt64_t hash[25];
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const UInt64_t *block;
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size_t block_size;
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{
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/* expanded loop */
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hash[ 0] ^= le2me_64(block[ 0]);
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hash[ 1] ^= le2me_64(block[ 1]);
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hash[ 2] ^= le2me_64(block[ 2]);
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hash[ 3] ^= le2me_64(block[ 3]);
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hash[ 4] ^= le2me_64(block[ 4]);
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hash[ 5] ^= le2me_64(block[ 5]);
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hash[ 6] ^= le2me_64(block[ 6]);
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hash[ 7] ^= le2me_64(block[ 7]);
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hash[ 8] ^= le2me_64(block[ 8]);
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/* if not sha3-512 */
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if (block_size > 72) {
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hash[ 9] ^= le2me_64(block[ 9]);
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hash[10] ^= le2me_64(block[10]);
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hash[11] ^= le2me_64(block[11]);
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hash[12] ^= le2me_64(block[12]);
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/* if not sha3-384 */
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if (block_size > 104) {
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hash[13] ^= le2me_64(block[13]);
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hash[14] ^= le2me_64(block[14]);
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hash[15] ^= le2me_64(block[15]);
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hash[16] ^= le2me_64(block[16]);
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/* if not sha3-256 */
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if (block_size > 136) {
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hash[17] ^= le2me_64(block[17]);
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#ifdef FULL_SHA3_FAMILY_SUPPORT
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/* if not sha3-224 */
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if (block_size > 144) {
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hash[18] ^= le2me_64(block[18]);
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hash[19] ^= le2me_64(block[19]);
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hash[20] ^= le2me_64(block[20]);
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hash[21] ^= le2me_64(block[21]);
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hash[22] ^= le2me_64(block[22]);
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hash[23] ^= le2me_64(block[23]);
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hash[24] ^= le2me_64(block[24]);
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}
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#endif
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}
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}
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}
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/* make a permutation of the hash */
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rhash_sha3_permutation(hash);
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}
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#define SHA3_FINALIZED 0x80000000
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/*
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* Calculate message hash.
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* Can be called repeatedly with chunks of the message to be hashed.
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*
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* @param ctx the algorithm context containing current hashing state
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* @param msg message chunk
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* @param size length of the message chunk
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*/
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void
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rhash_sha3_update(ctx, msg, size)
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sha3_ctx *ctx;
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const unsigned char *msg;
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size_t size;
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{
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size_t idx = (size_t)ctx->rest;
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size_t block_size = (size_t)ctx->block_size;
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if (ctx->rest & SHA3_FINALIZED)
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return; /* too late for additional input */
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ctx->rest = (unsigned)((ctx->rest + size) % block_size);
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/* fill partial block */
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if (idx) {
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size_t left = block_size - idx;
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memcpy((char *)ctx->message + idx, msg,
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(size < left ? size : left));
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if (size < left)
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return;
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/* process partial block */
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rhash_sha3_process_block(ctx->hash, ctx->message, block_size);
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msg += left;
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size -= left;
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}
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while (size >= block_size) {
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UInt64_t *aligned_message_block;
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if (IS_ALIGNED_64(msg)) {
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/*
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* the most common case is processing of an already
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* aligned message without copying it
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*/
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aligned_message_block = (UInt64_t *)msg;
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} else {
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memcpy(ctx->message, msg, block_size);
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aligned_message_block = ctx->message;
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}
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rhash_sha3_process_block(ctx->hash, aligned_message_block,
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block_size);
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msg += block_size;
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size -= block_size;
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}
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if (size) {
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memcpy(ctx->message, msg, size); /* save leftovers */
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}
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}
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/*
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* Store calculated hash into the given array.
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*
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* @param ctx the algorithm context containing current hashing state
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* @param result calculated hash in binary form
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*/
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void
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rhash_sha3_final(ctx, result)
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sha3_ctx *ctx;
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unsigned char *result;
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{
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size_t digest_length = 100 - ctx->block_size / 2;
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const size_t block_size = ctx->block_size;
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if (!(ctx->rest & SHA3_FINALIZED))
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{
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/* clear the rest of the data queue */
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memset((char *)ctx->message + ctx->rest, 0,
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block_size - ctx->rest);
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((char *)ctx->message)[ctx->rest] |= 0x06;
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((char *)ctx->message)[block_size - 1] |= 0x80;
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/* process final block */
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rhash_sha3_process_block(ctx->hash, ctx->message, block_size);
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ctx->rest = SHA3_FINALIZED; /* mark context as finalized */
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}
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assert(block_size > digest_length);
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if (result) me64_to_le_str(result, ctx->hash, digest_length);
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}
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void
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SHA3_Final(result, ctx)
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UInt8_t *result;
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SHA3_CTX *ctx;
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{
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rhash_sha3_final(ctx, result);
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}
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#ifdef USE_KECCAK
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/*
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* Store calculated hash into the given array.
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*
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* @param ctx the algorithm context containing current hashing state
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* @param result calculated hash in binary form
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*/
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void
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rhash_keccak_final(sha3_ctx *ctx, unsigned char *result)
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{
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size_t digest_length = 100 - ctx->block_size / 2;
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const size_t block_size = ctx->block_size;
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if (!(ctx->rest & SHA3_FINALIZED)) {
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/* clear the rest of the data queue */
|
|
memset((char *)ctx->message + ctx->rest, 0,
|
|
block_size - ctx->rest);
|
|
((char *)ctx->message)[ctx->rest] |= 0x01;
|
|
((char *)ctx->message)[block_size - 1] |= 0x80;
|
|
|
|
/* process final block */
|
|
rhash_sha3_process_block(ctx->hash, ctx->message, block_size);
|
|
ctx->rest = SHA3_FINALIZED; /* mark context as finalized */
|
|
}
|
|
|
|
assert(block_size > digest_length);
|
|
if (result)
|
|
me64_to_le_str(result, ctx->hash, digest_length);
|
|
}
|
|
#endif /* USE_KECCAK */
|
|
|
|
#endif /* HAVE_LONGLONG */
|