Mailing List Archive

* mpi/ec.c (field_table_mpis): New.
(ec_p_init): Cache converted field table MPIs.
--

Signed-off-by: Jussi Kivilinna <jussi.kivilinna@iki.fi>
---
mpi/ec.c | 22 ++++++++++++++++------
1 file changed, 16 insertions(+), 6 deletions(-)

diff --git a/mpi/ec.c b/mpi/ec.c
index e25d9d8a..029099b4 100644
--- a/mpi/ec.c
+++ b/mpi/ec.c
@@ -719,7 +719,10 @@ static const struct field_table field_table[] = {
},
{ NULL, NULL, NULL, NULL, NULL, NULL },
};
+
+static gcry_mpi_t field_table_mpis[DIM(field_table)];

+
/* Force recomputation of all helper variables. */
void
_gcry_mpi_ec_get_reset (mpi_ec_t ec)
@@ -876,9 +879,19 @@ ec_p_init (mpi_ec_t ctx, enum gcry_mpi_ec_models model,
gcry_mpi_t f_p;
gpg_err_code_t rc;

- rc = _gcry_mpi_scan (&f_p, GCRYMPI_FMT_HEX, field_table[i].p, 0, NULL);
- if (rc)
- log_fatal ("scanning ECC parameter failed: %s\n", gpg_strerror (rc));
+ if (field_table_mpis[i] == NULL)
+ {
+ rc = _gcry_mpi_scan (&f_p, GCRYMPI_FMT_HEX, field_table[i].p, 0,
+ NULL);
+ if (rc)
+ log_fatal ("scanning ECC parameter failed: %s\n",
+ gpg_strerror (rc));
+ field_table_mpis[i] = f_p; /* cache */
+ }
+ else
+ {
+ f_p = field_table_mpis[i];
+ }

if (!mpi_cmp (p, f_p))
{
@@ -888,7 +901,6 @@ ec_p_init (mpi_ec_t ctx, enum gcry_mpi_ec_models model,
ctx->mul2 = field_table[i].mul2 ? field_table[i].mul2 : ctx->mul2;
ctx->pow2 = field_table[i].pow2 ? field_table[i].pow2 : ctx->pow2;
ctx->mod = field_table[i].mod ? field_table[i].mod : ctx->mod;
- _gcry_mpi_release (f_p);

if (ctx->a)
{
@@ -907,8 +919,6 @@ ec_p_init (mpi_ec_t ctx, enum gcry_mpi_ec_models model,

break;
}
-
- _gcry_mpi_release (f_p);
}

/* Prepare for fast reduction. */
--
2.30.2


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