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ECC wc_ecc_point_is_on_curve: validate oridinates against prime

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This commit is contained in:
Sean Parkinson 2021-11-30 14:08:07 +10:00
parent 7221e06ff7
commit 567cd155ea
1 changed files with 17 additions and 0 deletions
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17
wolfcrypt/src/ecc.c
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@ -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);
}