wolfSSL/wolfssl
1
0
Fork 1
mirror of https://github.com/wolfSSL/wolfssl.git synced 2025-08-01 11:44:38 +02:00
Code Issues Packages Projects Releases Wiki Activity

Merge pull request #4617 from SparkiDev/ecc_point_on_curve

Browse Source 
ECC wc_ecc_point_is_on_curve: validate oridinates against prime
This commit is contained in:
David Garske
2021-11-30 08:25:47 -08:00
committed by GitHub
parent 7a41089b12 567cd155ea
commit 5a55baddad
1 changed files with 17 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

17
wolfcrypt/src/ecc.c
View File

@@ -4349,6 +4349,23 @@ int wc_ecc_point_is_on_curve(ecc_point *p, int curve_idx)
ECC_CURVE_FIELD_PRIME | ECC_CURVE_FIELD_AF |
ECC_CURVE_FIELD_BF);
}
/* x must be in the range [0, p-1] */
if (err == MP_OKAY) {
if (mp_cmp(p->x, curve->prime) != MP_LT)
err = ECC_OUT_OF_RANGE_E;
}
/* y must be in the range [0, p-1] */
if (err == MP_OKAY) {
if (mp_cmp(p->y, curve->prime) != MP_LT)
err = ECC_OUT_OF_RANGE_E;
}
/* z must be 1 */
if (err == MP_OKAY) {
if (!mp_isone(p->z))
err = ECC_BAD_ARG_E;
}
if (err == MP_OKAY) {
err = wc_ecc_is_point(p, curve->Af, curve->Bf, curve->prime);
}