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/*
* Copyright (c) 2013, Alexey Degtyarev <alexey@renatasystems.org>.
* All rights reserved.
*
* GOST R 34.11-2012 core and API functions.
*
* $Id$
*/
#include "crypt-port.h"
#if INCLUDE_gost_yescrypt
#include "alg-gost3411-2012-core.h"
#pragma GCC diagnostic ignored "-Wcast-align"
#define BSWAP64(x) \
(((x & 0xFF00000000000000ULL) >> 56) | \
((x & 0x00FF000000000000ULL) >> 40) | \
((x & 0x0000FF0000000000ULL) >> 24) | \
((x & 0x000000FF00000000ULL) >> 8) | \
((x & 0x00000000FF000000ULL) << 8) | \
((x & 0x0000000000FF0000ULL) << 24) | \
((x & 0x000000000000FF00ULL) << 40) | \
((x & 0x00000000000000FFULL) << 56))
void
GOST34112012Cleanup(GOST34112012Context *CTX)
{
explicit_bzero(CTX, sizeof (GOST34112012Context));
}
void
GOST34112012Init(GOST34112012Context *CTX, const unsigned int digest_size)
{
unsigned int i;
memset(CTX, 0, sizeof (GOST34112012Context));
CTX->digest_size = digest_size;
for (i = 0; i < 8; i++)
{
if (digest_size == 256)
CTX->h.QWORD[i] = 0x0101010101010101ULL;
else
CTX->h.QWORD[i] = 0x00ULL;
}
}
static inline void
pad(GOST34112012Context *CTX)
{
if (CTX->bufsize < sizeof CTX->buffer)
{
memset (CTX->buffer + CTX->bufsize, 0,
sizeof(CTX->buffer) - CTX->bufsize);
CTX->buffer[CTX->bufsize] = 0x01;
}
}
static inline void
add512(const uint512_u *x, const uint512_u *y, uint512_u *r)
{
#ifndef __GOST3411_BIG_ENDIAN__
unsigned int CF;
unsigned int i;
CF = 0;
for (i = 0; i < 8; i++)
{
const unsigned long long left = x->QWORD[i];
unsigned long long sum;
sum = left + y->QWORD[i] + CF;
if (sum != left)
CF = (sum < left);
r->QWORD[i] = sum;
}
#else
const unsigned char *xp, *yp;
unsigned char *rp;
unsigned int i;
int buf;
xp = (const unsigned char *) &x[0];
yp = (const unsigned char *) &y[0];
rp = (unsigned char *) &r[0];
buf = 0;
for (i = 0; i < 64; i++)
{
buf = xp[i] + yp[i] + (buf >> 8);
rp[i] = (unsigned char) (buf & 0xFF);
}
#endif
}
static void
g(uint512_u *h, const uint512_u *N, const unsigned char *m)
{
#ifdef __GOST3411_HAS_SSE2__
__m128i xmm0, xmm2, xmm4, xmm6; /* XMMR0-quadruple */
__m128i xmm1, xmm3, xmm5, xmm7; /* XMMR1-quadruple */
unsigned int i;
LOAD(N, xmm0, xmm2, xmm4, xmm6);
XLPS128M(h, xmm0, xmm2, xmm4, xmm6);
LOAD(m, xmm1, xmm3, xmm5, xmm7);
XLPS128R(xmm0, xmm2, xmm4, xmm6, xmm1, xmm3, xmm5, xmm7);
for (i = 0; i < 11; i++)
ROUND128(i, xmm0, xmm2, xmm4, xmm6, xmm1, xmm3, xmm5, xmm7);
XLPS128M((&C[11]), xmm0, xmm2, xmm4, xmm6);
X128R(xmm0, xmm2, xmm4, xmm6, xmm1, xmm3, xmm5, xmm7);
X128M(h, xmm0, xmm2, xmm4, xmm6);
X128M(m, xmm0, xmm2, xmm4, xmm6);
UNLOAD(h, xmm0, xmm2, xmm4, xmm6);
/* Restore the Floating-point status on the CPU */
_mm_empty();
#else
uint512_u Ki, data;
unsigned int i;
XLPS(h, N, (&data));
/* Starting E() */
Ki = data;
XLPS((&Ki), ((const uint512_u *) &m[0]), (&data));
for (i = 0; i < 11; i++)
ROUND(i, (&Ki), (&data));
XLPS((&Ki), (&C[11]), (&Ki));
X((&Ki), (&data), (&data));
/* E() done */
X((&data), h, (&data));
X((&data), ((const uint512_u *) &m[0]), h);
#endif
}
static inline void
stage2(GOST34112012Context *CTX, const unsigned char *data)
{
uint512_u m;
memcpy(&m, data, sizeof(m));
g(&(CTX->h), &(CTX->N), (const unsigned char *)&m);
add512(&(CTX->N), &buffer512, &(CTX->N));
add512(&(CTX->Sigma), &m, &(CTX->Sigma));
}
static inline void
stage3(GOST34112012Context *CTX)
{
uint512_u buf = {{ 0 }};
#ifndef __GOST3411_BIG_ENDIAN__
buf.QWORD[0] = CTX->bufsize << 3;
#else
buf.QWORD[0] = BSWAP64(CTX->bufsize << 3);
#endif
pad(CTX);
g(&(CTX->h), &(CTX->N), (const unsigned char *) &(CTX->buffer));
add512(&(CTX->N), &buf, &(CTX->N));
add512(&(CTX->Sigma), (const uint512_u *) &CTX->buffer[0],
&(CTX->Sigma));
g(&(CTX->h), &buffer0, (const unsigned char *) &(CTX->N));
g(&(CTX->h), &buffer0, (const unsigned char *) &(CTX->Sigma));
memcpy(&(CTX->hash), &(CTX->h), sizeof (uint512_u));
}
void
GOST34112012Update(GOST34112012Context *CTX, const unsigned char *data, size_t len)
{
size_t chunksize;
if (CTX->bufsize) {
chunksize = 64 - CTX->bufsize;
if (chunksize > len)
chunksize = len;
memcpy(&CTX->buffer[CTX->bufsize], data, chunksize);
CTX->bufsize += chunksize;
len -= chunksize;
data += chunksize;
if (CTX->bufsize == 64)
{
stage2(CTX, CTX->buffer);
CTX->bufsize = 0;
}
}
while (len > 63)
{
stage2(CTX, data);
data += 64;
len -= 64;
}
if (len) {
memcpy(&CTX->buffer, data, len);
CTX->bufsize = len;
}
}
void
GOST34112012Final(GOST34112012Context *CTX, unsigned char *digest)
{
stage3(CTX);
CTX->bufsize = 0;
if (CTX->digest_size == 256)
memcpy(digest, &(CTX->hash.QWORD[4]), 32);
else
memcpy(digest, &(CTX->hash.QWORD[0]), 64);
GOST34112012Cleanup(CTX);
}
#endif /* INCLUDE_gost_yescrypt */
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