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rsid_signature_example.cc
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// License: Apache 2.0. See LICENSE file in root directory.
// Copyright(c) 2020-2021 Intel Corporation. All Rights Reserved.
#include "rsid_signature_example.h"
#include "mbedtls/sha256.h"
#include <cstring>
#include <RealSenseID/FaceAuthenticator.h>
#define SHA_256_DIGEST_SIZE_BYTES 32
#define PRI_KEY_SIZE 32
#define PUB_X_Y_SIZE 32
#define PUB_KEY_SIZE 64
// Host's private key
static unsigned char HOST_PRI_KEY[PRI_KEY_SIZE] = {
0xb9, 0xad, 0xfe, 0x0e, 0x6d, 0xd4, 0xfb, 0x6f, 0x76, 0xdf, 0x53, 0x92, 0x87, 0x4e, 0x58, 0x39,
0xdd, 0x51, 0xd1, 0xaa, 0x79, 0x94, 0x5e, 0xa8, 0x36, 0x8f, 0xb5, 0xdf, 0xa8, 0x28, 0x26, 0x53};
// Host's public key
static unsigned char HOST_PUB_KEY[PUB_KEY_SIZE] = {
0xa9, 0x19, 0xcd, 0x93, 0x0f, 0xfb, 0x3e, 0x95, 0x5e, 0xf2, 0x94, 0xa5, 0x90, 0xca, 0x0e, 0x82,
0x19, 0x08, 0x72, 0x23, 0x8d, 0xec, 0x49, 0x97, 0xb4, 0x7d, 0x1c, 0x81, 0x6f, 0x18, 0x4e, 0xe7,
0x86, 0xf5, 0x69, 0x7a, 0xde, 0x6a, 0x69, 0xac, 0x64, 0xa2, 0xcd, 0xdf, 0x8c, 0xe1, 0x7a, 0xea,
0x4d, 0xf7, 0xc6, 0xd6, 0x10, 0xa2, 0xc5, 0x33, 0xe6, 0x0c, 0x2f, 0xce, 0x55, 0x6e, 0x1c, 0xf8};
// Device's public key
static unsigned char DEVICE_PUB_KEY[PUB_KEY_SIZE] = {
0x22, 0x52, 0x97, 0x90, 0xdf, 0x5e, 0x11, 0xe7, 0xba, 0xe8, 0xa5, 0x62, 0xec, 0x06, 0xd9, 0x73,
0x20, 0x4b, 0x9b, 0x5a, 0x14, 0x55, 0x3c, 0x64, 0xd9, 0xa6, 0x12, 0xb3, 0xb0, 0xa2, 0xfb, 0x3f,
0x91, 0xeb, 0x49, 0xc0, 0x2c, 0x6b, 0x3e, 0x5e, 0xdc, 0x3c, 0x90, 0x7a, 0x5d, 0x80, 0x63, 0x73,
0xff, 0x6f, 0x77, 0xcf, 0x04, 0xa8, 0x8b, 0x30, 0xd2, 0x44, 0x2b, 0x91, 0xda, 0x3f, 0x62, 0xc3};
namespace RealSenseID
{
namespace Examples
{
SignHelper::SignHelper()
{
mbedtls_entropy_init(&_entropy);
mbedtls_ctr_drbg_init(&_ctr_drbg);
mbedtls_ecdsa_init(&_ecdsa_host_context);
mbedtls_ecdsa_init(&_ecdsa_device_context);
if (mbedtls_ctr_drbg_seed(&_ctr_drbg, mbedtls_entropy_func, &_entropy, NULL, 0))
return;
if (mbedtls_ecdsa_genkey(&_ecdsa_host_context, MBEDTLS_ECP_DP_SECP256R1, mbedtls_ctr_drbg_random, &_ctr_drbg))
return;
if (mbedtls_mpi_read_binary(&_ecdsa_host_context.d, HOST_PRI_KEY, PRI_KEY_SIZE))
return;
if (mbedtls_mpi_read_binary(&_ecdsa_host_context.Q.X, HOST_PUB_KEY, PUB_X_Y_SIZE))
return;
if (mbedtls_mpi_read_binary(&_ecdsa_host_context.Q.Y, HOST_PUB_KEY + PUB_X_Y_SIZE, PUB_X_Y_SIZE))
return;
if (mbedtls_ecdsa_genkey(&_ecdsa_device_context, MBEDTLS_ECP_DP_SECP256R1, mbedtls_ctr_drbg_random, &_ctr_drbg))
return;
if (mbedtls_mpi_read_binary(&_ecdsa_device_context.d, HOST_PRI_KEY, PRI_KEY_SIZE))
return;
if (mbedtls_mpi_read_binary(&_ecdsa_device_context.Q.X, DEVICE_PUB_KEY, PUB_X_Y_SIZE))
return;
if (mbedtls_mpi_read_binary(&_ecdsa_device_context.Q.Y, DEVICE_PUB_KEY + PUB_X_Y_SIZE, PUB_X_Y_SIZE))
return;
if (mbedtls_ctr_drbg_seed(&_ctr_drbg, mbedtls_entropy_func, &_entropy, NULL, 0))
return;
_initialized = true;
}
SignHelper::~SignHelper()
{
mbedtls_entropy_free(&_entropy);
mbedtls_ctr_drbg_free(&_ctr_drbg);
mbedtls_ecdsa_free(&_ecdsa_host_context);
mbedtls_ecdsa_free(&_ecdsa_device_context);
}
bool SignHelper::Sign(const unsigned char* buffer, const unsigned int buffer_len, unsigned char* out_sig)
{
if (!_initialized)
return false;
unsigned char digest[SHA_256_DIGEST_SIZE_BYTES];
int ret = mbedtls_sha256_ret(buffer, buffer_len, digest, 0);
if (ret != 0)
{
printf("[ERROR] Failed! mbedtls_sha256_ret returned %d", ret);
return false;
}
unsigned char signature[MBEDTLS_ECDSA_MAX_LEN];
size_t sign_len, lenTag;
ret = mbedtls_ecdsa_write_signature(&_ecdsa_host_context, MBEDTLS_MD_SHA256, digest, SHA_256_DIGEST_SIZE_BYTES, signature,
&sign_len, mbedtls_ctr_drbg_random, &_ctr_drbg);
if (ret != 0)
{
printf("[ERROR] mbedtls_ecdsa_write_signature failed with status %d", ret);
return false;
}
unsigned char* ptrSig = signature;
mbedtls_mpi r, s;
mbedtls_mpi_init(&r);
mbedtls_mpi_init(&s);
ret =
mbedtls_asn1_get_tag(&ptrSig, signature + sign_len, &lenTag, MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE);
if (!ret)
{
ret = mbedtls_asn1_get_mpi(&ptrSig, signature + sign_len, &r);
if (!ret)
{
ret = mbedtls_asn1_get_mpi(&ptrSig, signature + sign_len, &s);
if (!ret)
{
ret = mbedtls_mpi_write_binary(&r, out_sig, PUB_X_Y_SIZE);
if (!ret)
{
ret = mbedtls_mpi_write_binary(&s, out_sig + PUB_X_Y_SIZE, PUB_X_Y_SIZE);
}
}
}
}
mbedtls_mpi_free(&r);
mbedtls_mpi_free(&s);
return ret == 0; // return true on success
}
bool SignHelper::Verify(const unsigned char* buffer, const unsigned int buffer_len, const unsigned char* sig,
const unsigned int sign_len)
{
if (!_initialized)
return false;
(void)sign_len; // unused
unsigned char buf[MBEDTLS_ECDSA_MAX_LEN];
unsigned char* p = buf + sizeof(buf);
mbedtls_mpi r, s;
mbedtls_mpi_init(&r);
mbedtls_mpi_init(&s);
int ret = mbedtls_mpi_read_binary(&r, sig, PUB_X_Y_SIZE);
if (!ret)
{
ret = mbedtls_mpi_read_binary(&s, sig + PUB_X_Y_SIZE, PUB_X_Y_SIZE);
if (!ret)
{
size_t len = 0;
MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_mpi(&p, buf, &s));
MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_mpi(&p, buf, &r));
MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_len(&p, buf, len));
MBEDTLS_ASN1_CHK_ADD(len,
mbedtls_asn1_write_tag(&p, buf, MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE));
unsigned char digest[SHA_256_DIGEST_SIZE_BYTES];
ret = mbedtls_sha256_ret(buffer, buffer_len, digest, 0);
if (ret != 0)
{
printf("[ERROR] Failed! mbedtls_sha256_ret returned %d", ret);
return false;
}
ret = mbedtls_ecdsa_read_signature(&_ecdsa_device_context, digest, SHA_256_DIGEST_SIZE_BYTES, p, len);
}
}
mbedtls_mpi_free(&r);
mbedtls_mpi_free(&s);
return ret == 0; // return true on success
};
void SignHelper::UpdateDevicePubKey(const unsigned char* pubKey)
{
::memcpy(DEVICE_PUB_KEY, pubKey, PUB_KEY_SIZE);
if (mbedtls_ecdsa_genkey(&_ecdsa_device_context, MBEDTLS_ECP_DP_SECP256R1, mbedtls_ctr_drbg_random, &_ctr_drbg))
return;
if (mbedtls_mpi_read_binary(&_ecdsa_device_context.d, HOST_PRI_KEY, PRI_KEY_SIZE))
return;
if (mbedtls_mpi_read_binary(&_ecdsa_device_context.Q.X, DEVICE_PUB_KEY, PUB_X_Y_SIZE))
return;
if (mbedtls_mpi_read_binary(&_ecdsa_device_context.Q.Y, DEVICE_PUB_KEY + PUB_X_Y_SIZE, PUB_X_Y_SIZE))
return;
if (mbedtls_ctr_drbg_seed(&_ctr_drbg, mbedtls_entropy_func, &_entropy, NULL, 0))
return;
}
const unsigned char* SignHelper::GetHostPubKey() const
{
return HOST_PUB_KEY;
}
Status SignHelper::ExchangeKeys(FaceAuthenticator* faceAuthenticator)
{
rsid_pairing_args rv;
::memcpy(rv.host_pubkey, GetHostPubKey(), sizeof(rv.host_pubkey));
::memset(rv.host_pubkey_sig, 0, sizeof(rv.host_pubkey_sig));
::memset(rv.device_pubkey_result, 0, sizeof(rv.device_pubkey_result));
Status s = faceAuthenticator->Pair(rv.host_pubkey, rv.host_pubkey_sig, rv.device_pubkey_result);
if (s == Status::Ok)
UpdateDevicePubKey((unsigned char*) rv.device_pubkey_result);
return s;
}
} // namespace Examples
} // namespace RealSenseID
/*
* c example implementation of signature callbacks.
* 1. create SignHelper instance.
* 2. store it in the *ctx field of the rsid_signature_clbk struct.
* 3. when the c callback are called, SignHelper* is extracted from the *ctx field,
* and used to perform the actual sign/verify callbacks.
*/
rsid_signature_clbk* rsid_create_example_sig_clbk()
{
auto* clbk = new (rsid_signature_clbk);
clbk->ctx = static_cast<void*>(new RealSenseID::Examples::SignHelper());
clbk->sign_clbk = rsid_sign_example;
clbk->verify_clbk = rsid_verify_example;
return clbk;
}
/* destroy security context */
void rsid_destroy_example_sig_clbk(rsid_signature_clbk* clbk)
{
if (clbk == nullptr)
return;
if (clbk->ctx != nullptr)
{
delete (reinterpret_cast<RealSenseID::Examples::SignHelper*>(clbk->ctx));
}
delete (clbk);
}
int rsid_sign_example(const unsigned char* buffer, const unsigned int buffer_len, unsigned char* out_sig, void* ctx)
{
auto* sig_clbk = static_cast<RealSenseID::Examples::SignHelper*>(ctx);
return static_cast<int>(sig_clbk->Sign(buffer, buffer_len, out_sig));
}
int rsid_verify_example(const unsigned char* buffer, const unsigned int buffer_len, const unsigned char* sig,
const unsigned int siglen, void* ctx)
{
auto* sig_clbk = static_cast<RealSenseID::Examples::SignHelper*>(ctx);
return static_cast<int>(sig_clbk->Verify(buffer, buffer_len, sig, siglen));
}
const unsigned char* rsid_get_host_pubkey_example(rsid_signature_clbk* clbk)
{
auto* sig_clbk = static_cast<RealSenseID::Examples::SignHelper*>(clbk->ctx);
return sig_clbk->GetHostPubKey();
}
void rsid_update_device_pubkey_example(rsid_signature_clbk *clbk, const unsigned char* pubkey)
{
auto* sig_clbk = static_cast<RealSenseID::Examples::SignHelper*>(clbk->ctx);
sig_clbk->UpdateDevicePubKey(pubkey);
}
/* Create pairing args using the given rsid_signature_clbk helper */
rsid_pairing_args* rsid_create_pairing_args_example(rsid_signature_clbk* clbk)
{
auto *rv = new rsid_pairing_args();
auto* sig_clbk = static_cast<RealSenseID::Examples::SignHelper*>(clbk->ctx);
::memcpy(rv->host_pubkey, sig_clbk->GetHostPubKey(), sizeof(rv->host_pubkey));
::memset(rv->host_pubkey_sig, 0, sizeof(rv->host_pubkey_sig));
::memset(rv->device_pubkey_result, 0, sizeof(rv->device_pubkey_result));
return rv;
}
// Destroy paring args
void rsid_destroy_pairing_args_example(rsid_pairing_args* args)
{
delete args;
}