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crypto/shamir: Memzero stack variables even in performace critical functions.

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This commit is contained in:
Andrew Kozlik 2019-05-03 14:18:54 +02:00
parent 223868f552
commit 025974a97d
1 changed files with 5 additions and 0 deletions
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5
crypto/shamir.c
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@ -192,6 +192,8 @@ static void gf256_mul(uint32_t r[8], const uint32_t a[8], const uint32_t b[8]) {
r[5] ^= a2[6] & b[7]; r[5] ^= a2[6] & b[7];
r[6] ^= a2[7] & b[7]; r[6] ^= a2[7] & b[7];
r[7] ^= a2[0] & b[7]; r[7] ^= a2[0] & b[7];
memzero(a2, sizeof(a2));
} }
/* /*
@ -253,6 +255,9 @@ static void gf256_inv(uint32_t r[8], uint32_t x[8]) {
gf256_square(z, z); // z = x^200 gf256_square(z, z); // z = x^200
gf256_mul(r, r, z); // r = x^250 gf256_mul(r, r, z); // r = x^250
gf256_mul(r, r, y); // r = x^254 gf256_mul(r, r, y); // r = x^254
memzero(y, sizeof(y));
memzero(z, sizeof(z));
} }
bool shamir_interpolate(uint8_t *result, uint8_t result_index, bool shamir_interpolate(uint8_t *result, uint8_t result_index,