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Optimize the implementation of ec_field_size() 

No need to create and copy BIGNUM p, a and b, just call
EC_GROUP_get0_field() instead.

Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Paul Yang <kaishen.yy@antfin.com>
(Merged from https://github.com/openssl/openssl/pull/23313)
This commit is contained in:
K1 2024-01-16 21:07:38 +08:00 committed by Matt Caswell
parent 20ddfe78e9
commit 9170cc0398
1 changed files with 4 additions and 17 deletions
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21
crypto/sm2/sm2_crypt.c
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@ -46,25 +46,12 @@ IMPLEMENT_ASN1_FUNCTIONS(SM2_Ciphertext)
static size_t ec_field_size(const EC_GROUP *group)
{
/* Is there some simpler way to do this? */
BIGNUM *p = BN_new();
BIGNUM *a = BN_new();
BIGNUM *b = BN_new();
size_t field_size = 0;
const BIGNUM *p = EC_GROUP_get0_field(group);
if (p == NULL || a == NULL || b == NULL)
goto done;
if (p == NULL)
return 0;
if (!EC_GROUP_get_curve(group, p, a, b, NULL))
goto done;
field_size = (BN_num_bits(p) + 7) / 8;
done:
BN_free(p);
BN_free(a);
BN_free(b);
return field_size;
return BN_num_bytes(p);
}
int ossl_sm2_plaintext_size(const unsigned char *ct, size_t ct_size,