wolfSSL/wolfssl
1
0
Fork 1
mirror of https://github.com/wolfSSL/wolfssl.git synced 2025-07-29 18:27:29 +02:00
Code Issues Packages Projects Releases Wiki Activity

EC scalar mult with SP Math: fix scalar length check

Browse Source 
The support curves in SP all have an order length the same as modulus
length. The scalar cannot be larger than the order and so fix the check.
This commit is contained in:
Sean Parkinson
2023-01-23 10:02:14 +10:00
parent 4b8ab2550d
commit 4592f1a5b4
1 changed files with 4 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
wolfcrypt/src/ecc.c
View File

@ -3465,8 +3465,10 @@ exit:
(void)a;
/* k can't have more bits than modulus count plus 1 */
if (mp_count_bits(k) > mp_count_bits(modulus) + 1) {
/* For supported curves the order is the same length in bits as the modulus.
* Can't have more than order bits for the scalar.
*/
if (mp_count_bits(k) > mp_count_bits(modulus)) {
return ECC_OUT_OF_RANGE_E;
}
if (mp_count_bits(G->x) > mp_count_bits(modulus) ||