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Fix U2F counter endianness (#1592)

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Co-authored-by: あく <alleteam@gmail.com>
This commit is contained in:
Walter Doekes 2022-08-17 17:44:08 +02:00 committed by GitHub
parent 6c268ec581
commit 831da59ed0
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 7 additions and 2 deletions
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9
applications/u2f/u2f.c
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@ -4,6 +4,7 @@
#include "u2f_data.h"
#include <furi_hal.h>
#include <furi_hal_random.h>
#include <littlefs/lfs_util.h> // for lfs_tobe32
#include "toolbox/sha256.h"
#include "toolbox/hmac_sha256.h"
@ -256,6 +257,7 @@ static uint16_t u2f_authenticate(U2fData* U2F, uint8_t* buf) {
uint8_t flags = 0;
uint8_t hash[32];
uint8_t signature[64];
uint32_t be_u2f_counter;
if(u2f_data_check(false) == false) {
U2F->ready = false;
@ -275,11 +277,14 @@ static uint16_t u2f_authenticate(U2fData* U2F, uint8_t* buf) {
}
U2F->user_present = false;
// The 4 byte counter is represented in big endian
be_u2f_counter = lfs_tobe32(U2F->counter);
// Generate hash
sha256_start(&sha_ctx);
sha256_update(&sha_ctx, req->app_id, 32);
sha256_update(&sha_ctx, &flags, 1);
sha256_update(&sha_ctx, (uint8_t*)&(U2F->counter), 4);
sha256_update(&sha_ctx, (uint8_t*)&(be_u2f_counter), 4);
sha256_update(&sha_ctx, req->challenge, 32);
sha256_finish(&sha_ctx, hash);
@ -309,7 +314,7 @@ static uint16_t u2f_authenticate(U2fData* U2F, uint8_t* buf) {
uECC_sign(priv_key, hash, 32, signature, U2F->p_curve);
resp->user_present = flags;
resp->counter = U2F->counter;
resp->counter = be_u2f_counter;
uint8_t signature_len = u2f_der_encode_signature(resp->signature, signature);
memcpy(resp->signature + signature_len, state_no_error, 2);