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/* keccak.c - SHA3 hash functions
* Copyright (C) 2015 g10 Code GmbH
*
* This file is part of Libgcrypt.
*
* Libgcrypt is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser general Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* Libgcrypt 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 program; if not, see <http://www.gnu.org/licenses/>.
*/
#include <config.h>
#include <string.h>
#include "g10lib.h"
#include "bithelp.h"
#include "bufhelp.h"
#include "cipher.h"
#include "hash-common.h"
typedef struct
{
u64 h0;
} KECCAK_STATE;
typedef struct
{
gcry_md_block_ctx_t bctx;
KECCAK_STATE state;
} KECCAK_CONTEXT;
static void
keccak_init (int algo, void *context, unsigned int flags)
{
KECCAK_CONTEXT *ctx = context;
KECCAK_STATE *hd = &ctx->state;
unsigned int features = _gcry_get_hw_features ();
(void)flags;
memset (hd, 0, sizeof *hd);
ctx->bctx.nblocks = 0;
ctx->bctx.nblocks_high = 0;
ctx->bctx.count = 0;
ctx->bctx.blocksize = 128;
ctx->bctx.bwrite = NULL;
(void)features;
}
static void
sha3_224_init (void *context, unsigned int flags)
{
keccak_init (GCRY_MD_SHA3_224, context, flags);
}
static void
sha3_256_init (void *context, unsigned int flags)
{
keccak_init (GCRY_MD_SHA3_256, context, flags);
}
static void
sha3_384_init (void *context, unsigned int flags)
{
keccak_init (GCRY_MD_SHA3_384, context, flags);
}
static void
sha3_512_init (void *context, unsigned int flags)
{
keccak_init (GCRY_MD_SHA3_512, context, flags);
}
/* The routine final terminates the computation and
* returns the digest.
* The handle is prepared for a new cycle, but adding bytes to the
* handle will the destroy the returned buffer.
* Returns: 64 bytes representing the digest. When used for sha384,
* we take the leftmost 48 of those bytes.
*/
static void
keccak_final (void *context)
{
KECCAK_CONTEXT *hd = context;
unsigned int stack_burn_depth;
_gcry_md_block_write (context, NULL, 0); /* flush */ ;
}
static byte *
keccak_read (void *context)
{
KECCAK_CONTEXT *hd = (KECCAK_CONTEXT *) context;
return hd->bctx.buf;
}
/*
Self-test section.
*/
static gpg_err_code_t
selftests_keccak (int algo, int extended, selftest_report_func_t report)
{
return 0;
#if 0
const char *what;
const char *errtxt;
/* FIXME: Add a switch(algo) or use several functions. */
what = "short string";
errtxt = _gcry_hash_selftest_check_one
(GCRY_MD_SHA3_384, 0,
"abc", 3,
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 48);
if (errtxt)
goto failed;
if (extended)
{
what = "long string";
errtxt = _gcry_hash_selftest_check_one
(GCRY_MD_SHA3_384, 0,
"abcdefghbcdefghicdefghijdefghijkefghijklfghijklmghijklmn"
"hijklmnoijklmnopjklmnopqklmnopqrlmnopqrsmnopqrstnopqrstu", 112,
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00",48);
if (errtxt)
goto failed;
what = "one million \"a\"";
errtxt = _gcry_hash_selftest_check_one
(GCRY_MD_SHA3_384, 1,
NULL, 0,
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00",48);
if (errtxt)
goto failed;
}
return 0; /* Succeeded. */
failed:
if (report)
report ("digest", algo, what, errtxt);
return GPG_ERR_SELFTEST_FAILED;
#endif
}
/* Run a full self-test for ALGO and return 0 on success. */
static gpg_err_code_t
run_selftests (int algo, int extended, selftest_report_func_t report)
{
gpg_err_code_t ec;
switch (algo)
{
case GCRY_MD_SHA3_224:
case GCRY_MD_SHA3_256:
case GCRY_MD_SHA3_384:
case GCRY_MD_SHA3_512:
ec = selftests_keccak (algo, extended, report);
break;
default:
ec = GPG_ERR_DIGEST_ALGO;
break;
}
return ec;
}
static byte sha3_224_asn[] = { 0x30 };
static gcry_md_oid_spec_t oid_spec_sha3_224[] =
{
{ "?" },
/* PKCS#1 sha3_224WithRSAEncryption */
{ "?" },
{ NULL }
};
static byte sha3_256_asn[] = { 0x30 };
static gcry_md_oid_spec_t oid_spec_sha3_256[] =
{
{ "?" },
/* PKCS#1 sha3_256WithRSAEncryption */
{ "?" },
{ NULL }
};
static byte sha3_384_asn[] = { 0x30 };
static gcry_md_oid_spec_t oid_spec_sha3_384[] =
{
{ "?" },
/* PKCS#1 sha3_384WithRSAEncryption */
{ "?" },
{ NULL }
};
static byte sha3_512_asn[] = { 0x30 };
static gcry_md_oid_spec_t oid_spec_sha3_512[] =
{
{ "?" },
/* PKCS#1 sha3_512WithRSAEncryption */
{ "?" },
{ NULL }
};
gcry_md_spec_t _gcry_digest_spec_sha3_224 =
{
GCRY_MD_SHA3_224, {0, 1},
"SHA3-224", sha3_224_asn, DIM (sha3_224_asn), oid_spec_sha3_224, 64,
sha3_224_init, _gcry_md_block_write, keccak_final, keccak_read,
sizeof (KECCAK_CONTEXT),
run_selftests
};
gcry_md_spec_t _gcry_digest_spec_sha3_256 =
{
GCRY_MD_SHA3_256, {0, 1},
"SHA3-256", sha3_256_asn, DIM (sha3_256_asn), oid_spec_sha3_256, 64,
sha3_256_init, _gcry_md_block_write, keccak_final, keccak_read,
sizeof (KECCAK_CONTEXT),
run_selftests
};
gcry_md_spec_t _gcry_digest_spec_sha3_384 =
{
GCRY_MD_SHA3_384, {0, 1},
"SHA3-384", sha3_384_asn, DIM (sha3_384_asn), oid_spec_sha3_384, 64,
sha3_384_init, _gcry_md_block_write, keccak_final, keccak_read,
sizeof (KECCAK_CONTEXT),
run_selftests
};
gcry_md_spec_t _gcry_digest_spec_sha3_512 =
{
GCRY_MD_SHA3_512, {0, 1},
"SHA3-512", sha3_512_asn, DIM (sha3_512_asn), oid_spec_sha3_512, 64,
sha3_512_init, _gcry_md_block_write, keccak_final, keccak_read,
sizeof (KECCAK_CONTEXT),
run_selftests
};
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