/** * 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. * */ #ifndef OPTIGA_BACKEND_UTILS_H__ #define OPTIGA_BACKEND_UTILS_H__ #include #include #include #include "sdk_config.h" #include "nordic_common.h" #include "sdk_errors.h" /** @brief Define for a integer tag in DER encoding. */ #define DER_TAG_INTEGER 0x02 /** @brief Max size of integer in DER encoding. * * @note This limit is for this implementation only, ASN.1 DER supports more */ #define DER_INTEGER_MAX_LEN 0x7F /** @brief Define for overhead to encode a DER of two integers * * @details TAG + LENGTH needs 2 bytes if the highest bit of the integer is set * we need an extra byte */ #define DER_OVERHEAD ((2 + 1) * 2) /** * @brief Decodes two ASN.1 integers to the R and S components of a ECC signature. * * @param[in] p_asn1 Pointer to buffer containing the ASN.1 encoded R and S values. * @param[in] asn1_len Length of the asn1 buffer. * @param[out] p_rs Pointer to buffer where to write the R and S values * @param[in,out] p_rs_len pointer to variable containing length of the rs buffer, * updated to actual length after the call. * * @returns NRF_SUCCESS on success, otherwise NRF_ERROR_CRYPTO_INTERNAL. */ ret_code_t asn1_to_ecdsa_rs(uint8_t const * p_asn1, size_t asn1_len, uint8_t * p_rs, size_t * p_rs_len); /** * @brief Encodes the ECDSA signature components (r, s) in ASN.1 format. * * @param[in] p_r Pointer to buffer containing component r of the ECDSA signature. * @param[in] r_len Length of the r component of the ECDSA signature. * @param[in] p_s Pointer to buffer containing component s of the ECDSA signature. * @param[in] s_len Length of the s component of the ECDSA signature. * @param[out] p_asn_sig Pointer to buffer to hold the resulting ASN.1-encoded ECDSA signature. * @param[out] p_asn_sig_len Pointer to variable holding the length of the buffer for ASN.1-encoded * ECDSA signature. This will be updated to the actual size when the * function is called. * * @returns True on success, otherwise false. */ bool ecdsa_rs_to_asn1(uint8_t const * p_r, size_t r_len, uint8_t const * p_s, size_t s_len, uint8_t * p_asn_sig, size_t * p_asn_sig_len); #endif // OPTIGA_BACKEND_UTILS_H__