/** * 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 #include #include #include "nrf_crypto_ecc.h" #include "nrf_crypto_ecdsa.h" /*lint -save -e????*/ #include "optiga/optiga_crypt.h" #include "ecdsa_utils.h" /*lint -restore*/ ret_code_t nrf_crypto_backend_optiga_sign( void * p_context, void const * p_private_key, uint8_t const * p_data, size_t data_size, uint8_t * p_signature) { optiga_lib_status_t res = OPTIGA_LIB_ERROR; nrf_crypto_backend_optiga_ecc_private_key_t * p_prv = (nrf_crypto_backend_optiga_ecc_private_key_t *)p_private_key; optiga_key_id_t oid = p_prv->oid; uint16_t der_sig_len = NRF_CRYPTO_ECDSA_SECP256R1_SIGNATURE_SIZE + ECDSA_RS_MAX_ASN1_OVERHEAD; uint8_t der_sig[NRF_CRYPTO_ECDSA_SECP256R1_SIGNATURE_SIZE + ECDSA_RS_MAX_ASN1_OVERHEAD] = {0}; res = optiga_crypt_ecdsa_sign((uint8_t *)p_data, data_size, oid, der_sig, &der_sig_len); if(res != OPTIGA_LIB_SUCCESS) { return NRF_ERROR_CRYPTO_INTERNAL; } // convert signature to format suitable for nrf_crypto if (!asn1_to_ecdsa_rs(der_sig, der_sig_len, p_signature, NRF_CRYPTO_ECDSA_SECP256R1_SIGNATURE_SIZE)) { return NRF_ERROR_CRYPTO_INTERNAL; } return NRF_SUCCESS; } ret_code_t nrf_crypto_backend_optiga_verify( void * p_context, void const * p_public_key, uint8_t const * p_data, size_t data_size, uint8_t const * p_signature) { nrf_crypto_backend_secp256r1_public_key_t * p_pub = (nrf_crypto_backend_secp256r1_public_key_t *)p_public_key; optiga_key_id_t oid = p_pub->oid; size_t der_sig_len = NRF_CRYPTO_ECDSA_SECP256R1_SIGNATURE_SIZE + ECDSA_RS_MAX_ASN1_OVERHEAD; uint8_t der_sig[NRF_CRYPTO_ECDSA_SECP256R1_SIGNATURE_SIZE + ECDSA_RS_MAX_ASN1_OVERHEAD] = {0}; const size_t rs_size = NRF_CRYPTO_ECDSA_SECP256R1_SIGNATURE_SIZE/2; optiga_lib_status_t res = OPTIGA_LIB_ERROR; // Convert signature to DER format needed by OPTIGA if (!ecdsa_rs_to_asn1_integers(p_signature, p_signature + rs_size, rs_size, der_sig, &der_sig_len)) { return NRF_ERROR_CRYPTO_INTERNAL; } if (oid == NRF_CRYPTO_INFINEON_PUBKEY_HOST_OID) { // Create magic OID for pubkey from host public_key_from_host_t pub_key = { .public_key = p_pub->raw_pubkey, .length = NRF_CRYPTO_ECC_SECP256R1_RAW_PUBLIC_KEY_SIZE + 4, // public key + DER BITSTRING header .curve = OPTIGA_ECC_NIST_P_256 }; res = optiga_crypt_ecdsa_verify((uint8_t *)p_data, data_size, der_sig, der_sig_len, OPTIGA_CRYPT_HOST_DATA, &pub_key); } else { // Public key is in OPTIGA, referenced by OID res = optiga_crypt_ecdsa_verify((uint8_t *)p_data, data_size, der_sig, der_sig_len, OPTIGA_CRYPT_OID_DATA, &oid); } // consider everything that is not success a signature failure if (res != OPTIGA_LIB_SUCCESS) { return NRF_ERROR_CRYPTO_ECDSA_INVALID_SIGNATURE; } return NRF_SUCCESS; } #endif // NRF_MODULE_ENABLED(NRF_CRYPTO) && NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_OPTIGA)