arno/trezor-firmware
1
0
Fork 0
mirror of https://github.com/trezor/trezor-firmware.git synced 2024-11-22 07:28:10 +00:00
Code Issues Releases Wiki Activity

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

Browse Source
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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
crypto/shamir.c
View File

@ -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[6] ^= a2[7] & 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_mul(r, r, z); // r = x^250
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,