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/*-
* Copyright 2016 Vsevolod Stakhov
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "config.h"
#include "cryptobox.h"
#include "curve25519.h"
#include "platform_config.h"
extern unsigned long cpu_config;
typedef struct curve25519_impl_s {
unsigned long cpu_flags;
const char *desc;
void (*scalarmult) (guint8 *mypublic,
const guint8 *secret,
const guint8 *basepoint);
void (*scalarmult_base) (guint8 *mypublic,
const guint8 *secret);
} curve25519_impl_t;
#define CURVE25519_DECLARE(ext) \
void scalarmult_##ext(guint8 *mypublic, const guint8 *secret, const guint8 *basepoint); \
void scalarmult_base_##ext(guint8 *mypublic, const guint8 *secret)
#define CURVE25519_IMPL(cpuflags, desc, ext) \
{(cpuflags), desc, scalarmult_##ext, scalarmult_base_##ext}
#if defined(__LP64__)
#if defined(HAVE_AVX)
CURVE25519_DECLARE(avx);
#define CURVE25519_AVX CURVE25519_IMPL(CPUID_AVX, "avx", avx)
#endif
#endif
CURVE25519_DECLARE(ref);
#define CURVE25519_REF CURVE25519_IMPL(0, "ref", ref)
#if defined(CMAKE_ARCH_x86_64) || defined(CMAKE_ARCH_i386)
CURVE25519_DECLARE(donna);
#define CURVE25519_GENERIC CURVE25519_IMPL(0, "donna", donna)
#else
#define CURVE25519_GENERIC CURVE25519_REF
#endif
static const curve25519_impl_t curve25519_list[] = {
CURVE25519_GENERIC,
#if defined(CURVE25519_AVX)
CURVE25519_AVX,
#endif
};
const guchar secA[] = {0x5A, 0xC9, 0x9F, 0x33, 0x63, 0x2E, 0x5A, 0x76, 0x8D,
0xE7, 0xE8, 0x1B, 0xF8, 0x54, 0xC2, 0x7C, 0x46, 0xE3,
0xFB, 0xF2, 0xAB, 0xBA, 0xCD, 0x29, 0xEC, 0x4A, 0xFF,
0x51, 0x73, 0x69, 0xC6, 0x60};
const guchar secB[] = {0x47, 0xDC, 0x3D, 0x21, 0x41, 0x74, 0x82, 0x0E, 0x11,
0x54, 0xB4, 0x9B, 0xC6, 0xCD, 0xB2, 0xAB, 0xD4, 0x5E,
0xE9, 0x58, 0x17, 0x05, 0x5D, 0x25, 0x5A, 0xA3, 0x58,
0x31, 0xB7, 0x0D, 0x32, 0x60};
static const curve25519_impl_t *curve25519_opt = &curve25519_list[0];
static gboolean
curve25519_test_impl (const curve25519_impl_t *impl)
{
guchar sec_local[32], sec_ref[32],
pubA[32], pubB[32];
curve25519_impl_t ref_impl = CURVE25519_REF;
ref_impl.scalarmult (pubA, secA, curve25519_basepoint);
ref_impl.scalarmult (pubB, secB, curve25519_basepoint);
impl->scalarmult (sec_local, secA, pubB);
ref_impl.scalarmult (sec_ref, secA, pubB);
if (memcmp (sec_local, sec_ref, sizeof (sec_ref)) != 0) {
return FALSE;
}
impl->scalarmult (sec_local, secB, pubA);
ref_impl.scalarmult (sec_ref, secB, pubA);
if (memcmp (sec_local, sec_ref, sizeof (sec_ref)) != 0) {
return FALSE;
}
impl->scalarmult (sec_local, secB, pubA);
impl->scalarmult (sec_ref, secA, pubB);
if (memcmp (sec_local, sec_ref, sizeof (sec_ref)) != 0) {
return FALSE;
}
return TRUE;
}
const char*
curve25519_load (void)
{
guint i;
if (cpu_config != 0) {
for (i = 0; i < G_N_ELEMENTS(curve25519_list); i++) {
if (curve25519_list[i].cpu_flags & cpu_config) {
curve25519_opt = &curve25519_list[i];
break;
}
}
}
g_assert (curve25519_test_impl (curve25519_opt));
return curve25519_opt->desc;
}
int
curve25519 (guchar *mypublic,
const guchar *secret,
const guchar *basepoint)
{
curve25519_opt->scalarmult (mypublic, secret, basepoint);
return 0;
}
int
curve25519_base (guchar *mypublic, const guchar *secret)
{
curve25519_opt->scalarmult_base (mypublic, secret);
return 0;
}
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