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