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Hardcode numwords in semi-internal vli_numBits()

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This commit is contained in:
Manuel Pégourié-Gonnard 2019-11-04 12:56:59 +01:00
parent 94e48498ef
commit 2bf5a129cf
3 changed files with 10 additions and 13 deletions
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6
tinycrypt/ecc_dsa.c
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@ -159,7 +159,7 @@ int uECC_sign_with_k(const uint8_t *private_key, const uint8_t *message_hash,
bits2int(tmp, message_hash, hash_size, curve);
uECC_vli_modAdd(s, tmp, s, curve->n, num_n_words); /* s = e + r*d */
uECC_vli_modMult(s, s, k, curve->n, num_n_words); /* s = (e + r*d) / k */
if (uECC_vli_numBits(s, num_n_words) > (bitcount_t)curve->num_bytes * 8) {
if (uECC_vli_numBits(s) > (bitcount_t)curve->num_bytes * 8) {
return 0;
}
@ -264,8 +264,8 @@ int uECC_verify(const uint8_t *public_key, const uint8_t *message_hash,
points[1] = curve->G;
points[2] = _public;
points[3] = sum;
num_bits = smax(uECC_vli_numBits(u1, num_n_words),
uECC_vli_numBits(u2, num_n_words));
num_bits = smax(uECC_vli_numBits(u1),
uECC_vli_numBits(u2));
point = points[(!!uECC_vli_testBit(u1, num_bits - 1)) |
((!!uECC_vli_testBit(u2, num_bits - 1)) << 1)];