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https://github.com/trezor/trezor-firmware.git
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98 lines
2.0 KiB
C
98 lines
2.0 KiB
C
// Copyright 2014 Google Inc. All rights reserved.
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//
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file or at
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// https://developers.google.com/open-source/licenses/bsd
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#ifndef __U2F_H_INCLUDED__
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#define __U2F_H_INCLUDED__
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#include <stdint.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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#ifndef __NO_PRAGMA_PACK
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#pragma pack(push, 1)
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#endif
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// General constants
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#define P256_SCALAR_SIZE 32 // nistp256 in bytes
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#define P256_POINT_SIZE ((P256_SCALAR_SIZE * 2) + 1)
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#define MAX_ECDSA_SIG_SIZE 72 // asn1 DER format
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#define MAX_KH_SIZE 128 // key handle
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#define MAX_CERT_SIZE 2048 // attestation certificate
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#define U2F_APPID_SIZE 32
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#define U2F_NONCE_SIZE 32
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#define UNCOMPRESSED_POINT 0x04
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typedef struct {
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uint8_t format;
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uint8_t x[P256_SCALAR_SIZE];
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uint8_t y[P256_SCALAR_SIZE];
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} P256_POINT;
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// U2Fv2 instructions
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#define U2F_INS_REGISTER 0x01
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#define U2F_INS_AUTHENTICATE 0x02
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#define U2F_INS_VERSION 0x03
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// U2F_REGISTER instruction defines
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#define U2F_REGISTER_ID 0x05 // magic constant
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#define U2F_REGISTER_HASH_ID 0x00 // magic constant
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typedef struct {
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uint8_t nonce[U2F_NONCE_SIZE];
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uint8_t appId[U2F_APPID_SIZE];
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} U2F_REGISTER_REQ;
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typedef struct {
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uint8_t registerId;
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P256_POINT pubKey;
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uint8_t keyHandleLen;
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uint8_t keyHandleCertSig[
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MAX_KH_SIZE +
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MAX_CERT_SIZE +
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MAX_ECDSA_SIG_SIZE];
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} U2F_REGISTER_RESP;
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// U2F_AUTHENTICATE instruction defines
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// Authentication parameter byte
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#define U2F_AUTH_ENFORCE 0x03 // Require user presence
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#define U2F_AUTH_CHECK_ONLY 0x07 // Test but do not consume
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typedef struct {
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uint8_t nonce[U2F_NONCE_SIZE];
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uint8_t appId[U2F_APPID_SIZE];
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uint8_t keyHandleLen;
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uint8_t keyHandle[MAX_KH_SIZE];
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} U2F_AUTHENTICATE_REQ;
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// Flags values
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#define U2F_TOUCHED 0x01
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#define U2F_ALTERNATE_INTERFACE 0x02
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typedef struct {
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uint8_t flags;
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uint32_t ctr;
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uint8_t sig[MAX_ECDSA_SIG_SIZE];
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} U2F_AUTHENTICATE_RESP;
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#ifndef __NO_PRAGMA_PACK
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#pragma pack(pop)
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#endif
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#ifdef __cplusplus
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}
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#endif
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#endif // __U2F_H_INCLUDED__
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