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Diffstat (limited to 'main/openssl/crypto/ec/ec_cvt.c')
-rw-r--r--main/openssl/crypto/ec/ec_cvt.c28
1 files changed, 27 insertions, 1 deletions
diff --git a/main/openssl/crypto/ec/ec_cvt.c b/main/openssl/crypto/ec/ec_cvt.c
index d45640ba..bfcbab35 100644
--- a/main/openssl/crypto/ec/ec_cvt.c
+++ b/main/openssl/crypto/ec/ec_cvt.c
@@ -78,7 +78,32 @@ EC_GROUP *EC_GROUP_new_curve_GFp(const BIGNUM *p, const BIGNUM *a, const BIGNUM
const EC_METHOD *meth;
EC_GROUP *ret;
+#if defined(OPENSSL_BN_ASM_MONT)
+ /*
+ * This might appear controversial, but the fact is that generic
+ * prime method was observed to deliver better performance even
+ * for NIST primes on a range of platforms, e.g.: 60%-15%
+ * improvement on IA-64, ~25% on ARM, 30%-90% on P4, 20%-25%
+ * in 32-bit build and 35%--12% in 64-bit build on Core2...
+ * Coefficients are relative to optimized bn_nist.c for most
+ * intensive ECDSA verify and ECDH operations for 192- and 521-
+ * bit keys respectively. Choice of these boundary values is
+ * arguable, because the dependency of improvement coefficient
+ * from key length is not a "monotone" curve. For example while
+ * 571-bit result is 23% on ARM, 384-bit one is -1%. But it's
+ * generally faster, sometimes "respectfully" faster, sometimes
+ * "tolerably" slower... What effectively happens is that loop
+ * with bn_mul_add_words is put against bn_mul_mont, and the
+ * latter "wins" on short vectors. Correct solution should be
+ * implementing dedicated NxN multiplication subroutines for
+ * small N. But till it materializes, let's stick to generic
+ * prime method...
+ * <appro>
+ */
+ meth = EC_GFp_mont_method();
+#else
meth = EC_GFp_nist_method();
+#endif
ret = EC_GROUP_new(meth);
if (ret == NULL)
@@ -122,7 +147,7 @@ EC_GROUP *EC_GROUP_new_curve_GFp(const BIGNUM *p, const BIGNUM *a, const BIGNUM
return ret;
}
-
+#ifndef OPENSSL_NO_EC2M
EC_GROUP *EC_GROUP_new_curve_GF2m(const BIGNUM *p, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)
{
const EC_METHOD *meth;
@@ -142,3 +167,4 @@ EC_GROUP *EC_GROUP_new_curve_GF2m(const BIGNUM *p, const BIGNUM *a, const BIGNUM
return ret;
}
+#endif