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Hardcode numwords in vli_modSub

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Manuel Pégourié-Gonnard 2019-11-04 14:50:54 +01:00
parent 0779be7f31
commit 1b0875d863
3 changed files with 27 additions and 33 deletions
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4
tinycrypt/ecc_dsa.c
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@ -253,7 +253,7 @@ int uECC_verify(const uint8_t *public_key, const uint8_t *message_hash,
uECC_vli_set(sum + num_words, _public + num_words);
uECC_vli_set(tx, curve->G);
uECC_vli_set(ty, curve->G + num_words);
uECC_vli_modSub(z, sum, tx, curve->p, num_words); /* z = x2 - x1 */
uECC_vli_modSub(z, sum, tx, curve->p); /* z = x2 - x1 */
XYcZ_add(tx, ty, sum, sum + num_words, curve);
uECC_vli_modInv(z, z, curve->p, num_words); /* z = 1/z */
apply_z(sum, sum + num_words, z);
@ -283,7 +283,7 @@ int uECC_verify(const uint8_t *public_key, const uint8_t *message_hash,
uECC_vli_set(tx, point);
uECC_vli_set(ty, point + num_words);
apply_z(tx, ty, z);
uECC_vli_modSub(tz, rx, tx, curve->p, num_words); /* Z = x2 - x1 */
uECC_vli_modSub(tz, rx, tx, curve->p); /* Z = x2 - x1 */
XYcZ_add(tx, ty, rx, ry, curve);
uECC_vli_modMult_fast(z, z, tz);
}