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Restore tinycrypt implementation of regularize_k()

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Signed-off-by: Shelly Liberman <shelly.liberman@arm.com>
This commit is contained in:
Shelly Liberman 2020-10-25 18:48:06 +02:00
parent 8472bc76c6
commit a23f599584
1 changed files with 4 additions and 1 deletions
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5
tinycrypt/ecc.c
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@ -1610,10 +1610,13 @@ static void EccPoint_mult(uECC_word_t * result, const uECC_word_t * point,
static uECC_word_t regularize_k(const uECC_word_t * const k, uECC_word_t *k0, static uECC_word_t regularize_k(const uECC_word_t * const k, uECC_word_t *k0,
uECC_word_t *k1) uECC_word_t *k1)
{ {
wordcount_t num_n_words = NUM_ECC_WORDS;
bitcount_t num_n_bits = NUM_ECC_BITS; bitcount_t num_n_bits = NUM_ECC_BITS;
uECC_word_t carry = uECC_vli_add(k0, k, curve_n) || uECC_word_t carry = uECC_vli_add(k0, k, curve_n) ||
uECC_vli_testBit(k0, num_n_bits); (num_n_bits < ((bitcount_t)num_n_words * uECC_WORD_SIZE * 8) &&
uECC_vli_testBit(k0, num_n_bits));
uECC_vli_add(k1, k0, curve_n); uECC_vli_add(k1, k0, curve_n);