79 lines
2.9 KiB
C
79 lines
2.9 KiB
C
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// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef __ESP_MBEDTLS_BIGNUM_H__
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#define __ESP_MBEDTLS_BIGNUM_H__
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#include_next "mbedtls/bignum.h"
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/**
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* This is a wrapper for the main mbedtls/bignum.h. This wrapper
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* provides a few additional ESP32-only functions.
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*
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* This is because we don't set MBEDTLS_BIGNUM_ALT in the same way we
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* do for AES, SHA, etc. Because we still use most of the bignum.h
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* implementation and just replace a few hardware accelerated
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* functions (see MBEDTLS_MPI_EXP_MOD_ALT & MBEDTLS_MPI_MUL_MPI_ALT in
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* esp_config.h).
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*
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* @note Unlike the other hardware accelerator support functions in esp32/hwcrypto, there is no
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* generic "hwcrypto/bignum.h" header for using these functions without mbedTLS. The reason for this
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* is that all of the function implementations depend strongly upon the mbedTLS MPI implementation.
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*/
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/**
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* @brief Lock access to RSA Accelerator (MPI/bignum operations)
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*
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* RSA Accelerator hardware unit can only be used by one
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* consumer at a time.
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*
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* @note This function is non-recursive (do not call it twice from the
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* same task.)
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*
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* @note You do not need to call this if you are using the mbedTLS bignum.h
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* API or esp_mpi_xxx functions. This function is only needed if you
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* want to call ROM RSA functions or access the registers directly.
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*
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*/
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void esp_mpi_acquire_hardware(void);
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/**
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* @brief Unlock access to RSA Accelerator (MPI/bignum operations)
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*
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* Has to be called once for each call to esp_mpi_acquire_hardware().
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*
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* @note You do not need to call this if you are using the mbedTLS bignum.h
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* API or esp_mpi_xxx functions. This function is only needed if you
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* want to call ROM RSA functions or access the registers directly.
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*/
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void esp_mpi_release_hardware(void);
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/* @brief MPI modular mupltiplication function
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*
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* Calculates Z = (X * Y) mod M using MPI hardware acceleration.
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*
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* This is not part of the standard mbedTLS bignum API.
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*
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* @note All of X, Y & Z should be less than 4096 bit long or an error is returned.
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*
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* @param Z Result bignum, should be pre-initialised with mbedtls_mpi_init().
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* @param X First multiplication argument.
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* @param Y Second multiplication argument.
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* @param M Modulus value for result.
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*
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* @return 0 on success, mbedTLS MPI error codes on failure.
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*/
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int esp_mpi_mul_mpi_mod(mbedtls_mpi *Z, const mbedtls_mpi *X, const mbedtls_mpi *Y, const mbedtls_mpi *M);
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#endif
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