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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 ''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 "chacha.h"
#include "platform_config.h"
extern unsigned long cpu_config;
typedef struct chacha_impl_t {
unsigned long cpu_flags;
const char *desc;
void (*chacha) (const chacha_key *key, const chacha_iv *iv,
const unsigned char *in, unsigned char *out, size_t inlen,
size_t rounds);
void (*xchacha) (const chacha_key *key, const chacha_iv24 *iv,
const unsigned char *in, unsigned char *out, size_t inlen,
size_t rounds);
void (*chacha_blocks) (chacha_state_internal *state,
const unsigned char *in, unsigned char *out, size_t bytes);
void (*hchacha) (const unsigned char key[32], const unsigned char iv[16],
unsigned char out[32], size_t rounds);
} chacha_impl_t;
#define CHACHA_DECLARE(ext) \
void chacha_##ext(const chacha_key *key, const chacha_iv *iv, const unsigned char *in, unsigned char *out, size_t inlen, size_t rounds); \
void xchacha_##ext(const chacha_key *key, const chacha_iv24 *iv, const unsigned char *in, unsigned char *out, size_t inlen, size_t rounds); \
void chacha_blocks_##ext(chacha_state_internal *state, const unsigned char *in, unsigned char *out, size_t bytes); \
void hchacha_##ext(const unsigned char key[32], const unsigned char iv[16], unsigned char out[32], size_t rounds);
#define CHACHA_IMPL(cpuflags, desc, ext) \
{(cpuflags), desc, chacha_##ext, xchacha_##ext, chacha_blocks_##ext, hchacha_##ext}
#if defined(HAVE_AVX2)
CHACHA_DECLARE(avx2)
#define CHACHA_AVX2 CHACHA_IMPL(CPUID_AVX2, "avx2", avx2)
#endif
#if defined(HAVE_AVX)
CHACHA_DECLARE(avx)
#define CHACHA_AVX CHACHA_IMPL(CPUID_AVX, "avx", avx)
#endif
#if defined(HAVE_SSE2)
CHACHA_DECLARE(sse2)
#define CHACHA_SSE2 CHACHA_IMPL(CPUID_SSE2, "sse2", sse2)
#endif
CHACHA_DECLARE(ref)
#define CHACHA_GENERIC CHACHA_IMPL(0, "generic", ref)
static const chacha_impl_t chacha_list[] = {
CHACHA_GENERIC,
#if defined(CHACHA_AVX2)
CHACHA_AVX2,
#endif
#if defined(CHACHA_AVX)
CHACHA_AVX,
#endif
#if defined(CHACHA_SSE2)
CHACHA_SSE2
#endif
};
static const chacha_impl_t *chacha_impl = &chacha_list[0];
static int
chacha_is_aligned (const void *p)
{
return ((size_t) p & (sizeof(size_t) - 1)) == 0;
}
const char *
chacha_load (void)
{
guint i;
if (cpu_config != 0) {
for (i = 0; i < G_N_ELEMENTS (chacha_list); i ++) {
if (chacha_list[i].cpu_flags & cpu_config) {
chacha_impl = &chacha_list[i];
break;
}
}
}
return chacha_impl->desc;
}
void chacha_init (chacha_state *S, const chacha_key *key,
const chacha_iv *iv, size_t rounds)
{
chacha_state_internal *state = (chacha_state_internal *) S;
memcpy (state->s + 0, key, 32);
memset (state->s + 32, 0, 8);
memcpy (state->s + 40, iv, 8);
state->rounds = rounds;
state->leftover = 0;
}
/* processes inlen bytes (can do partial blocks), handling input/ouput alignment */
static void
chacha_consume (chacha_state_internal *state,
const unsigned char *in, unsigned char *out, size_t inlen)
{
unsigned char buffer[16 * CHACHA_BLOCKBYTES];
int in_aligned, out_aligned;
/* it's ok to call with 0 bytes */
if (!inlen)
return;
/* if everything is aligned, handle directly */
in_aligned = chacha_is_aligned (in);
out_aligned = chacha_is_aligned (out);
if (in_aligned && out_aligned) {
chacha_impl->chacha_blocks (state, in, out, inlen);
return;
}
/* copy the unaligned data to an aligned buffer and process in chunks */
while (inlen) {
const size_t bytes = (inlen > sizeof(buffer)) ? sizeof(buffer) : inlen;
const unsigned char *src = in;
unsigned char *dst = (out_aligned) ? out : buffer;
if (!in_aligned) {
memcpy (buffer, in, bytes);
src = buffer;
}
chacha_impl->chacha_blocks (state, src, dst, bytes);
if (!out_aligned)
memcpy (out, buffer, bytes);
if (in)
in += bytes;
out += bytes;
inlen -= bytes;
}
}
/* hchacha */
void hchacha (const unsigned char key[32],
const unsigned char iv[16], unsigned char out[32], size_t rounds)
{
chacha_impl->hchacha (key, iv, out, rounds);
}
/* update, returns number of bytes written to out */
size_t
chacha_update (chacha_state *S, const unsigned char *in, unsigned char *out,
size_t inlen)
{
chacha_state_internal *state = (chacha_state_internal *) S;
unsigned char *out_start = out;
size_t bytes;
/* enough for at least one block? */
while ((state->leftover + inlen) >= CHACHA_BLOCKBYTES) {
/* handle the previous data */
if (state->leftover) {
bytes = (CHACHA_BLOCKBYTES - state->leftover);
if (in) {
memcpy (state->buffer + state->leftover, in, bytes);
in += bytes;
}
chacha_consume (state, (in) ? state->buffer : NULL, out,
CHACHA_BLOCKBYTES);
inlen -= bytes;
out += CHACHA_BLOCKBYTES;
state->leftover = 0;
}
/* handle the direct data */
bytes = (inlen & ~(CHACHA_BLOCKBYTES - 1));
if (bytes) {
chacha_consume (state, in, out, bytes);
inlen -= bytes;
if (in)
in += bytes;
out += bytes;
}
}
/* handle leftover data */
if (inlen) {
if (in)
memcpy (state->buffer + state->leftover, in, inlen);
else
memset (state->buffer + state->leftover, 0, inlen);
state->leftover += inlen;
}
return out - out_start;
}
/* finalize, write out any leftover data */
size_t
chacha_final (chacha_state *S, unsigned char *out)
{
chacha_state_internal *state = (chacha_state_internal *) S;
size_t leftover = state->leftover;
if (leftover) {
if (chacha_is_aligned (out)) {
chacha_impl->chacha_blocks (state, state->buffer, out, leftover);
}
else {
chacha_impl->chacha_blocks (state, state->buffer, state->buffer,
leftover);
memcpy (out, state->buffer, leftover);
}
}
rspamd_explicit_memzero (S, sizeof(chacha_state));
return leftover;
}
/* one-shot, input/output assumed to be word aligned */
void
chacha (const chacha_key *key, const chacha_iv *iv,
const unsigned char *in, unsigned char *out, size_t inlen,
size_t rounds)
{
chacha_impl->chacha (key, iv, in, out, inlen, rounds);
}
/*
xchacha, chacha with a 192 bit nonce
*/
void
xchacha_init (chacha_state *S, const chacha_key *key,
const chacha_iv24 *iv, size_t rounds)
{
chacha_key subkey;
hchacha (key->b, iv->b, subkey.b, rounds);
chacha_init (S, &subkey, (chacha_iv *) (iv->b + 16), rounds);
}
/* one-shot, input/output assumed to be word aligned */
void
xchacha (const chacha_key *key, const chacha_iv24 *iv,
const unsigned char *in, unsigned char *out, size_t inlen,
size_t rounds)
{
chacha_impl->xchacha (key, iv, in, out, inlen, rounds);
}
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