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Diffstat (limited to 'src/libcryptobox/curve25519/curve25519.c')
| -rw-r--r-- | src/libcryptobox/curve25519/curve25519.c | 97 |
1 files changed, 97 insertions, 0 deletions
diff --git a/src/libcryptobox/curve25519/curve25519.c b/src/libcryptobox/curve25519/curve25519.c new file mode 100644 index 000000000..1870d4987 --- /dev/null +++ b/src/libcryptobox/curve25519/curve25519.c @@ -0,0 +1,97 @@ +/* + * Copyright (c) 2015, Vsevolod Stakhov + * 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 "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); +} curve25519_impl_t; + +#define CURVE25519_DECLARE(ext) \ + void scalarmult_##ext(guint8 *mypublic, const guint8 *secret, const guint8 *basepoint) + +#define CURVE25519_IMPL(cpuflags, desc, ext) \ + {(cpuflags), desc, scalarmult_##ext} + +#if defined(__LP64__) + +#if defined(HAVE_AVX) +CURVE25519_DECLARE(avx); +#define CURVE25519_AVX CURVE25519_IMPL(CPUID_AVX, "avx", avx) +#endif + +#endif + +#if !defined(__LP64__) +CURVE25519_DECLARE(donna32); +#define CURVE25519_GENERIC CURVE25519_IMPL(0, "donna32", donna32) +#else +CURVE25519_DECLARE(donna64); +#define CURVE25519_GENERIC CURVE25519_IMPL(0, "donna64", donna64) +#endif + +static const curve25519_impl_t curve25519_list[] = { + CURVE25519_GENERIC, +#if defined(CURVE25519_AVX) + CURVE25519_AVX, +#endif +}; + +static const curve25519_impl_t *curve25519_opt = &curve25519_list[0]; + +void +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; + } + } + } +} + +int +curve25519 (guchar *mypublic, + const guchar *secret, + const guchar *basepoint) +{ + curve25519_opt->scalarmult (mypublic, secret, basepoint); + + return 0; +} + |