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- /**
- * Copyright (c) 2018 - 2020, Nordic Semiconductor ASA
- *
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without modification,
- * are permitted provided that the following conditions are met:
- *
- * 1. Redistributions of source code must retain the above copyright notice, this
- * list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form, except as embedded into a Nordic
- * Semiconductor ASA integrated circuit in a product or a software update for
- * such product, must reproduce the above copyright notice, this list of
- * conditions and the following disclaimer in the documentation and/or other
- * materials provided with the distribution.
- *
- * 3. Neither the name of Nordic Semiconductor ASA nor the names of its
- * contributors may be used to endorse or promote products derived from this
- * software without specific prior written permission.
- *
- * 4. This software, with or without modification, must only be used with a
- * Nordic Semiconductor ASA integrated circuit.
- *
- * 5. Any software provided in binary form under this license must not be reverse
- * engineered, decompiled, modified and/or disassembled.
- *
- * THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS
- * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA OR CONTRIBUTORS BE
- * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
- * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
- * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
- * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- */
- #include "sdk_config.h"
- #include "nordic_common.h"
- #if NRF_MODULE_ENABLED(NRF_CRYPTO) && NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_OPTIGA)
- #include <stdbool.h>
- #include <string.h>
- #include "nrf_crypto_ecc.h"
- #include "nrf_crypto_ecdh.h"
- #include "nrf_crypto_mem.h"
- #include "nrf_crypto_rng.h"
- #include "nrf_crypto_shared.h"
- #include "nrf_assert.h"
- #include "optiga_backend_ecc.h"
- /*lint -save -e????*/
- #include "optiga/optiga_crypt.h"
- /*lint -restore*/
- int nrf_crypto_backend_optiga_ecc_optiga_rng(void * p_param, unsigned char * p_data, size_t size)
- {
- #if NRF_MODULE_ENABLED(NRF_CRYPTO_RNG)
- return NRF_SUCCESS;
- #else
- return NRF_ERROR_CRYPTO_FEATURE_UNAVAILABLE;
- #endif
- }
- static const uint8_t der_pub_key_header[] = {
- 0x03, // ASN.1 BITSTRING
- 0x42, // bytes following
- 0x00, // no unused bits
- 0x04 // uncompressed key, see https://tools.ietf.org/html/rfc5480#section-2.2
- };
- #define DER_PUB_KEY_HEADER_LEN (sizeof(der_pub_key_header)/sizeof(der_pub_key_header[0]))
- // for our purposes we always have 1 byte tag + 1 byte length
- #define DER_OCTET_STRING_HEADER_LEN 2
- // lengths for the ASN.1 DER encoded keys imported and exported by OPTIGA
- #define OPTIGA_SECP256R1_PRIV_KEY_LEN (DER_OCTET_STRING_HEADER_LEN + NRF_CRYPTO_ECC_SECP256R1_RAW_PRIVATE_KEY_SIZE)
- #define OPTIGA_SECP256R1_PUBL_KEY_LEN (DER_PUB_KEY_HEADER_LEN + NRF_CRYPTO_ECC_SECP256R1_RAW_PUBLIC_KEY_SIZE)
- ret_code_t nrf_crypto_backend_optiga_key_pair_generate(
- void * p_context,
- void * p_private_key,
- void * p_public_key)
- {
- optiga_lib_status_t res = OPTIGA_LIB_ERROR;
- nrf_crypto_backend_secp256r1_public_key_t * p_pub =
- (nrf_crypto_backend_secp256r1_public_key_t *) p_public_key;
- nrf_crypto_backend_secp256r1_private_key_t * p_priv =
- (nrf_crypto_backend_secp256r1_private_key_t *) p_private_key;
- bool export_private_key;
- if (p_priv->oid == 0)
- {
- // OID=0 was implicitly specified when initializising, mostly due to Nordic internal code calling our API
- p_priv->oid = (optiga_key_id_t)0xE100;
- export_private_key = false;
- }
- else if (p_priv->oid == NRF_CRYPTO_INFINEON_PRIVKEY_HOST_OID)
- {
- export_private_key = true;
- }
- else // any other value for OID, we assume the OID was purposefully specified by caller
- {
- export_private_key = false;
- }
- void * priv_key;
- if (export_private_key)
- {
- //lint -save -e611 -e545 (Suspicious cast, Suspicious use of &)
- priv_key = (void*) &p_priv->raw_privkey;
- //lint -restore
- p_priv->oid = (optiga_key_id_t)NRF_CRYPTO_INFINEON_PRIVKEY_HOST_OID;
- }
- else
- {
- //lint -save -e611 -e545 (Suspicious cast, Suspicious use of &)
- priv_key = (void*) &p_priv->oid;
- memset(p_priv->raw_privkey, 0, OPTIGA_SECP256R1_PRIV_KEY_LEN);
- //lint -restore
- }
- // Set all flags because the nrf_crypto API does not allow to specify key use
- const optiga_key_usage_t key_usage = (optiga_key_usage_t)(OPTIGA_KEY_USAGE_AUTHENTICATION |
- OPTIGA_KEY_USAGE_SIGN |
- OPTIGA_KEY_USAGE_KEY_AGREEMENT);
- uint16_t publ_key_len = OPTIGA_SECP256R1_PUBL_KEY_LEN;
- res = optiga_crypt_ecc_generate_keypair(OPTIGA_ECC_NIST_P_256,
- key_usage,
- export_private_key,
- priv_key,
- p_pub->raw_pubkey,
- &publ_key_len);
- if(res != OPTIGA_LIB_SUCCESS)
- {
- // error in the optiga library
- return NRF_ERROR_CRYPTO_INTERNAL;
- }
- if(publ_key_len != OPTIGA_SECP256R1_PUBL_KEY_LEN)
- {
- // unexpected length
- return NRF_ERROR_CRYPTO_INTERNAL;
- }
- // mark the public key as stored in host memory
- p_pub->oid = (optiga_key_id_t)NRF_CRYPTO_INFINEON_PUBKEY_HOST_OID;
- return NRF_SUCCESS;
- }
- ret_code_t nrf_crypto_backend_optiga_public_key_calculate(
- void * p_context,
- void const * p_private_key,
- void * p_public_key)
- {
- return NRF_ERROR_CRYPTO_FEATURE_UNAVAILABLE;
- }
- ret_code_t nrf_crypto_backend_optiga_private_key_from_raw(
- void * p_private_key,
- uint8_t const * p_raw_data)
- {
- return NRF_ERROR_CRYPTO_FEATURE_UNAVAILABLE;
- }
- #define DER_TAG_OCTET_STRING 0x04
- ret_code_t nrf_crypto_backend_optiga_private_key_to_raw(
- void const * p_private_key,
- uint8_t * p_raw_data)
- {
- nrf_crypto_backend_secp256r1_private_key_t * p_priv =
- (nrf_crypto_backend_secp256r1_private_key_t *)p_private_key;
- nrf_crypto_ecc_curve_info_t const * p_info = p_priv->header.p_info;
- if(p_priv->oid != NRF_CRYPTO_INFINEON_PRIVKEY_HOST_OID)
- {
- // must use magic OID for private key exported to host
- return NRF_ERROR_CRYPTO_INTERNAL;
- }
- uint8_t* p_key = p_priv->raw_privkey;
- if(*p_key != DER_TAG_OCTET_STRING)
- {
- // private key must be encoded as DER OCTET STRING
- return NRF_ERROR_CRYPTO_INTERNAL;
- }
- p_key++;
- if(p_info == &g_nrf_crypto_ecc_secp256r1_curve_info)
- {
- if(*p_key != NRF_CRYPTO_ECC_SECP256R1_RAW_PRIVATE_KEY_SIZE)
- {
- // wrong length
- return NRF_ERROR_CRYPTO_INTERNAL;
- }
- p_key++;
- memcpy(p_raw_data, p_key, NRF_CRYPTO_ECC_SECP256R1_RAW_PRIVATE_KEY_SIZE);
- return NRF_SUCCESS;
- }
- return NRF_ERROR_CRYPTO_FEATURE_UNAVAILABLE;
- }
- ret_code_t nrf_crypto_backend_optiga_public_key_from_raw(
- void * p_public_key,
- uint8_t const * p_raw_data)
- {
- nrf_crypto_backend_secp256r1_public_key_t * p_pub =
- (nrf_crypto_backend_secp256r1_public_key_t *)p_public_key;
- nrf_crypto_ecc_curve_info_t const * p_info = p_pub->header.p_info;
- if (p_info == &g_nrf_crypto_ecc_secp256r1_curve_info)
- {
- // copy header
- memcpy(p_pub->raw_pubkey, der_pub_key_header, DER_PUB_KEY_HEADER_LEN);
- // copy public key data
- memcpy(p_pub->raw_pubkey + DER_PUB_KEY_HEADER_LEN, p_raw_data, NRF_CRYPTO_ECC_SECP256R1_RAW_PUBLIC_KEY_SIZE);
- // Set OID to magic number for host-supplied public key
- p_pub->oid = (optiga_key_id_t)NRF_CRYPTO_INFINEON_PUBKEY_HOST_OID;
- return NRF_SUCCESS;
- }
- return NRF_ERROR_CRYPTO_FEATURE_UNAVAILABLE;
- }
- ret_code_t nrf_crypto_backend_optiga_public_key_to_raw(
- void const * p_public_key,
- uint8_t * p_raw_data)
- {
- nrf_crypto_backend_secp256r1_public_key_t * p_pub =
- (nrf_crypto_backend_secp256r1_public_key_t *)p_public_key;
- nrf_crypto_ecc_curve_info_t const * p_info = p_pub->header.p_info;
- if(p_pub->oid != NRF_CRYPTO_INFINEON_PUBKEY_HOST_OID)
- {
- // must use magic OID for host supplied public key
- return NRF_ERROR_CRYPTO_INTERNAL;
- }
- if (p_info == &g_nrf_crypto_ecc_secp256r1_curve_info)
- {
- if(memcmp(p_pub->raw_pubkey, der_pub_key_header, DER_PUB_KEY_HEADER_LEN) != 0) {
- // public key not correctly encoded
- return NRF_ERROR_CRYPTO_INTERNAL;
- }
- memcpy(p_raw_data,
- p_pub->raw_pubkey + DER_PUB_KEY_HEADER_LEN,
- NRF_CRYPTO_ECC_SECP256R1_RAW_PUBLIC_KEY_SIZE);
- return NRF_SUCCESS;
- }
- return NRF_ERROR_CRYPTO_FEATURE_UNAVAILABLE;
- }
- ret_code_t nrf_crypto_backend_optiga_private_key_free(
- void * p_private_key)
- {
- return NRF_ERROR_CRYPTO_INTERNAL;
- }
- ret_code_t nrf_crypto_backend_optiga_public_key_free(
- void * p_public_key)
- {
- return NRF_ERROR_CRYPTO_INTERNAL;
- }
- #if NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_OPTIGA_ECC_SECP256R1)
- const nrf_crypto_ecc_curve_info_t g_nrf_crypto_ecc_secp256r1_curve_info =
- {
- .public_key_size = sizeof(nrf_crypto_backend_secp256r1_public_key_t),
- .private_key_size = sizeof(nrf_crypto_backend_optiga_ecc_private_key_t),
- .curve_type = NRF_CRYPTO_ECC_SECP256R1_CURVE_TYPE,
- .raw_private_key_size = NRF_CRYPTO_ECC_SECP256R1_RAW_PRIVATE_KEY_SIZE,
- .raw_public_key_size = NRF_CRYPTO_ECC_SECP256R1_RAW_PUBLIC_KEY_SIZE,
- .p_backend_data = (void *)OPTIGA_ECC_NIST_P_256,
- };
- #endif
- #endif // NRF_MODULE_ENABLED(NRF_CRYPTO) && NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_OPTIGA)
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