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