arno/trezor-firmware
1
0
Fork 0
mirror of https://github.com/trezor/trezor-firmware.git synced 2024-11-19 14:08:11 +00:00
Code Issues Releases Wiki Activity

refactor(crypto): extract get_public_key_length

Browse Source 
[no changelog]
This commit is contained in:
Ondřej Vejpustek 2024-08-06 13:12:36 +02:00
parent eaa12f1cad
commit 3994c654e9
1 changed files with 16 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

32
crypto/zkp_ecdsa.c
View File

@ -41,6 +41,16 @@ static bool is_zero_digest(const uint8_t *digest) {
return memcmp(digest, zeroes, 32) == 0; return memcmp(digest, zeroes, 32) == 0;
} }
static size_t get_public_key_length(const uint8_t *public_key_bytes) {
if (public_key_bytes[0] == 0x04) {
return 65;
} else if (public_key_bytes[0] == 0x02 || public_key_bytes[0] == 0x03) {
return 33;
} else {
return 0;
}
}
// ECDSA compressed public key derivation // ECDSA compressed public key derivation
// curve has to be &secp256k1 // curve has to be &secp256k1
// private_key_bytes has 32 bytes // private_key_bytes has 32 bytes
@ -322,17 +332,10 @@ int zkp_ecdsa_verify_digest(const ecdsa_curve *curve,
int result = 0; int result = 0;
int public_key_length = 0; size_t public_key_length = get_public_key_length(public_key_bytes);
if (public_key_length == 0) {
if (result == 0) {
if (public_key_bytes[0] == 0x04) {
public_key_length = 65;
} else if (public_key_bytes[0] == 0x02 || public_key_bytes[0] == 0x03) {
public_key_length = 33;
} else {
result = 1; result = 1;
} }
}
if (result == 0) { if (result == 0) {
if (is_zero_digest(digest)) { if (is_zero_digest(digest)) {
@ -430,17 +433,10 @@ int zkp_ecdh_multiply(const ecdsa_curve *curve,
int result = 0; int result = 0;
int public_key_length = 0; size_t public_key_length = get_public_key_length(public_key_bytes);
if (public_key_length == 0) {
if (result == 0) {
if (public_key_bytes[0] == 0x04) {
public_key_length = 65;
} else if (public_key_bytes[0] == 0x02 || public_key_bytes[0] == 0x03) {
public_key_length = 33;
} else {
result = 1; result = 1;
} }
}
const secp256k1_context *context_read_only = zkp_context_get_read_only(); const secp256k1_context *context_read_only = zkp_context_get_read_only();
secp256k1_pubkey public_key = {0}; secp256k1_pubkey public_key = {0};