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/*
* Copyright (c) 2015, Vsevolod Stakhov
* Copyright (c) 2015, Andrew Moon
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY AUTHOR ''AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL AUTHOR BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "cryptobox.h"
#include "poly1305.h"
#include "platform_config.h"
extern unsigned long cpu_config;
typedef struct poly1305_state_internal_t
{
unsigned char opaque[192]; /* largest state required (AVX2) */
size_t leftover, block_size;
unsigned char buffer[64]; /* largest blocksize (AVX2) */
} poly1305_state_internal;
typedef struct poly1305_impl_t
{
unsigned long cpu_flags;
const char *desc;
size_t (*block_size)(void);
void (*init_ext)(void *state, const poly1305_key *key, size_t bytes_hint);
void (*blocks)(void *state, const unsigned char *in, size_t inlen);
void (*finish_ext)(void *state, const unsigned char *in, size_t remaining,
unsigned char *mac);
void (*auth)(unsigned char *mac, const unsigned char *in, size_t inlen,
const poly1305_key *key);
} poly1305_impl_t;
#define POLY1305_DECLARE(ext) \
size_t poly1305_block_size_##ext(void); \
void poly1305_init_ext_##ext(void *state, const poly1305_key *key, size_t bytes_hint); \
void poly1305_blocks_##ext(void *state, const unsigned char *in, size_t inlen); \
void poly1305_finish_ext_##ext(void *state, const unsigned char *in, size_t remaining, unsigned char *mac); \
void poly1305_auth_##ext(unsigned char *mac, const unsigned char *m, size_t inlen, const poly1305_key *key);
#define POLY1305_IMPL(cpuflags, desc, ext) \
{(cpuflags), desc, poly1305_block_size_##ext, poly1305_init_ext_##ext, poly1305_blocks_##ext, poly1305_finish_ext_##ext, poly1305_auth_##ext}
#if defined(HAVE_AVX2)
POLY1305_DECLARE(avx2)
#define POLY1305_AVX2 POLY1305_IMPL(CPUID_AVX2, "avx2", avx2)
#endif
#if defined(HAVE_AVX)
POLY1305_DECLARE(avx)
#define POLY1305_AVX POLY1305_IMPL(CPUID_AVX, "avx", avx)
#endif
#if defined(HAVE_SSE2)
POLY1305_DECLARE(sse2)
#define POLY1305_SSE2 POLY1305_IMPL(CPUID_SSE2, "sse2", sse2)
#endif
POLY1305_DECLARE(ref)
#define POLY1305_GENERIC POLY1305_IMPL(0, "generic", ref)
/* list implemenations from most optimized to least, with generic as the last entry */
static const poly1305_impl_t poly1305_list[] =
{
POLY1305_GENERIC,
#if defined(POLY1305_AVX2)
POLY1305_AVX2,
#endif
#if defined(POLY1305_AVX)
POLY1305_AVX,
#endif
#if defined(POLY1305_SSE2)
POLY1305_SSE2,
#endif
};
static const poly1305_impl_t *poly1305_opt = &poly1305_list[0];
/* is the pointer aligned on a word boundary? */
static int poly1305_is_aligned(const void *p)
{
return ((size_t) p & (sizeof(size_t) - 1)) == 0;
}
const char*
poly1305_load(void)
{
guint i;
if (cpu_config != 0) {
for (i = 0; i < G_N_ELEMENTS(poly1305_list); i++) {
if (poly1305_list[i].cpu_flags & cpu_config) {
poly1305_opt = &poly1305_list[i];
break;
}
}
}
return poly1305_opt->desc;
}
/* processes inlen bytes (full blocks only), handling input alignment */
static void poly1305_consume(poly1305_state_internal *state,
const unsigned char *in, size_t inlen)
{
int in_aligned;
/* it's ok to call with 0 bytes */
if (!inlen)
return;
/* if everything is aligned, handle directly */
in_aligned = poly1305_is_aligned (in);
if (in_aligned) {
poly1305_opt->blocks (state->opaque, in, inlen);
return;
}
/* copy the unaligned data to an aligned buffer and process in chunks */
while (inlen) {
unsigned char buffer[1024];
const size_t bytes = (inlen > sizeof(buffer)) ? sizeof(buffer) : inlen;
memcpy (buffer, in, bytes);
poly1305_opt->blocks (state->opaque, buffer, bytes);
in += bytes;
inlen -= bytes;
}
}
void poly1305_init(poly1305_state *S, const poly1305_key *key)
{
poly1305_state_internal *state = (poly1305_state_internal *) S;
poly1305_opt->init_ext (state->opaque, key, 0);
state->leftover = 0;
state->block_size = poly1305_opt->block_size ();
}
void poly1305_init_ext(poly1305_state *S, const poly1305_key *key,
size_t bytes_hint)
{
poly1305_state_internal *state = (poly1305_state_internal *) S;
poly1305_opt->init_ext (state->opaque, key, bytes_hint);
state->leftover = 0;
state->block_size = poly1305_opt->block_size ();
}
void poly1305_update(poly1305_state *S, const unsigned char *in, size_t inlen)
{
poly1305_state_internal *state = (poly1305_state_internal *) S;
/* handle leftover */
if (state->leftover) {
size_t want = (state->block_size - state->leftover);
if (want > inlen)
want = inlen;
memcpy (state->buffer + state->leftover, in, want);
inlen -= want;
in += want;
state->leftover += want;
if (state->leftover < state->block_size)
return;
poly1305_opt->blocks (state->opaque, state->buffer, state->block_size);
state->leftover = 0;
}
/* process full blocks */
if (inlen >= state->block_size) {
size_t want = (inlen & ~(state->block_size - 1));
poly1305_consume (state, in, want);
in += want;
inlen -= want;
}
/* store leftover */
if (inlen) {
memcpy (state->buffer + state->leftover, in, inlen);
state->leftover += inlen;
}
}
void poly1305_finish(poly1305_state *S, unsigned char *mac)
{
poly1305_state_internal *state = (poly1305_state_internal *) S;
poly1305_opt->finish_ext (state->opaque, state->buffer, state->leftover,
mac);
}
void poly1305_auth(unsigned char *mac, const unsigned char *in, size_t inlen,
const poly1305_key *key)
{
poly1305_opt->auth (mac, in, inlen, key);
}
int poly1305_verify(const unsigned char mac1[16], const unsigned char mac2[16])
{
size_t i;
unsigned int dif = 0;
for (i = 0; i < 16; i++) {
dif |= (mac1[i] ^ mac2[i]);
}
dif = (dif - 1) >> ((sizeof(unsigned int) * 8) - 1);
return (dif & 1);
}
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