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This commit is contained in:
Frank Denis 2017-12-06 15:19:15 +00:00
parent 715cb6ba33
commit a916fff400
1 changed files with 27 additions and 27 deletions
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54
src/libsodium/crypto_core/ed25519/ref10/ed25519_ref10.c
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@ -422,6 +422,15 @@ ge25519_p3_0(ge25519_p3 *h)
fe25519_0(h->T); fe25519_0(h->T);
} }
static void
ge25519_cached_0(ge25519_cached *h)
{
fe25519_1(h->YplusX);
fe25519_1(h->YminusX);
fe25519_1(h->Z);
fe25519_0(h->T2d);
}
/* /*
r = p r = p
*/ */
@ -531,6 +540,15 @@ ge25519_cmov(ge25519_precomp *t, const ge25519_precomp *u, unsigned char b)
fe25519_cmov(t->xy2d, u->xy2d, b); fe25519_cmov(t->xy2d, u->xy2d, b);
} }
static void
ge25519_cmov_cached(ge25519_cached *t, const ge25519_cached *u, unsigned char b)
{
fe25519_cmov(t->YplusX, u->YplusX, b);
fe25519_cmov(t->YminusX, u->YminusX, b);
fe25519_cmov(t->Z, u->Z, b);
fe25519_cmov(t->T2d, u->T2d, b);
}
static void static void
ge25519_select(ge25519_precomp *t, const ge25519_precomp precomp[8], const signed char b) ge25519_select(ge25519_precomp *t, const ge25519_precomp precomp[8], const signed char b)
{ {
@ -554,21 +572,16 @@ ge25519_select(ge25519_precomp *t, const ge25519_precomp precomp[8], const signe
} }
static void static void
ge25519_cached_0(ge25519_cached *h) ge25519_select_base(ge25519_precomp *t, const int pos, const signed char b)
{ {
fe25519_1(h->YplusX); static const ge25519_precomp base[32][8] = { /* base[i][j] = (j+1)*256^i*B */
fe25519_1(h->YminusX); #ifdef HAVE_TI_MODE
fe25519_1(h->Z); # include "fe_51/base.h"
fe25519_0(h->T2d); #else
} # include "fe_25_5/base.h"
#endif
static void };
ge25519_cmov_cached(ge25519_cached *t, const ge25519_cached *u, unsigned char b) ge25519_select(t, base[pos], b);
{
fe25519_cmov(t->YplusX, u->YplusX, b);
fe25519_cmov(t->YminusX, u->YminusX, b);
fe25519_cmov(t->Z, u->Z, b);
fe25519_cmov(t->T2d, u->T2d, b);
} }
static void static void
@ -594,19 +607,6 @@ ge25519_select_cached(ge25519_cached *t, const ge25519_cached cached[8], const s
ge25519_cmov_cached(t, &minust, bnegative); ge25519_cmov_cached(t, &minust, bnegative);
} }
static void
ge25519_select_base(ge25519_precomp *t, const int pos, const signed char b)
{
static const ge25519_precomp base[32][8] = { /* base[i][j] = (j+1)*256^i*B */
#ifdef HAVE_TI_MODE
# include "fe_51/base.h"
#else
# include "fe_25_5/base.h"
#endif
};
ge25519_select(t, base[pos], b);
}
/* /*
r = p - q r = p - q
*/ */