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Added support for ES256K algorithm.

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It uses secp256k1 curve with SHA-256.

Signed-off-by: Pol Henarejos <pol.henarejos@cttc.es>
This commit is contained in:
Pol Henarejos
2023-08-16 12:18:42 +02:00
parent 5105545df0
commit 8ffd1bfe38
3 changed files with 11 additions and 1 deletions
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8
src/fido/cbor_get_info.c
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@@ -90,7 +90,7 @@ int cbor_get_info() {
CBOR_CHECK(cbor_encode_uint(&mapEncoder, MAX_CRED_ID_LENGTH)); // MAX_CRED_ID_MAX_LENGTH
CBOR_CHECK(cbor_encode_uint(&mapEncoder, 0x0A));
CBOR_CHECK(cbor_encoder_create_array(&mapEncoder, &arrayEncoder, 3));
CBOR_CHECK(cbor_encoder_create_array(&mapEncoder, &arrayEncoder, 4));
CBOR_CHECK(cbor_encoder_create_map(&arrayEncoder, &mapEncoder2, 2));
CBOR_CHECK(cbor_encode_text_stringz(&mapEncoder2, "alg"));
CBOR_CHECK(cbor_encode_negative_int(&mapEncoder2, -FIDO2_ALG_ES256));
@@ -109,6 +109,12 @@ int cbor_get_info() {
CBOR_CHECK(cbor_encode_text_stringz(&mapEncoder2, "type"));
CBOR_CHECK(cbor_encode_text_stringz(&mapEncoder2, "public-key"));
CBOR_CHECK(cbor_encoder_close_container(&arrayEncoder, &mapEncoder2));
CBOR_CHECK(cbor_encoder_create_map(&arrayEncoder, &mapEncoder2, 2));
CBOR_CHECK(cbor_encode_text_stringz(&mapEncoder2, "alg"));
CBOR_CHECK(cbor_encode_negative_int(&mapEncoder2, -FIDO2_ALG_ES256K));
CBOR_CHECK(cbor_encode_text_stringz(&mapEncoder2, "type"));
CBOR_CHECK(cbor_encode_text_stringz(&mapEncoder2, "public-key"));
CBOR_CHECK(cbor_encoder_close_container(&arrayEncoder, &mapEncoder2));
CBOR_CHECK(cbor_encoder_close_container(&mapEncoder, &arrayEncoder));
CBOR_CHECK(cbor_encode_uint(&mapEncoder, 0x0B));

3
src/fido/cbor_make_credential.c
View File

@@ -177,6 +177,9 @@ int cbor_make_credential(const uint8_t *data, size_t len) {
else if (pubKeyCredParams[i].alg == FIDO2_ALG_ES512) {
curve = FIDO2_CURVE_P521;
}
else if (pubKeyCredParams[i].alg == FIDO2_ALG_ES256K) {
curve = FIDO2_CURVE_P256K1;
}
else if (pubKeyCredParams[i].alg == 0) { // no present
curve = -1;
}

1
src/fido/fido.h
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@@ -64,6 +64,7 @@ extern int ecdh(uint8_t protocol, const mbedtls_ecp_point *Q, uint8_t *sharedSec
#define FIDO2_ALG_ES384 -35 //ECDSA-SHA384 P384
#define FIDO2_ALG_ES512 -36 //ECDSA-SHA512 P521
#define FIDO2_ALG_ECDH_ES_HKDF_256 -25 //ECDH-ES + HKDF-256
#define FIDO2_ALG_ES256K -47
#define FIDO2_CURVE_P256 1
#define FIDO2_CURVE_P384 2