OVMS3-idf/components/mbedtls/port/include/bignum_impl.h

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#ifndef _ESP_BIGNUM_H_
#define _ESP_BIGNUM_H_
#include <mbedtls/bignum.h>
#include <stdbool.h>
/* Use montgomery exponentiation (HAC 14.94) for calculating X ^ Y mod M,
this may be faster for some targets. The hardware acceleration support for modular
exponentiation on the ESP32 is slow for public key operations, so use montgomery
exponentiation instead.
*/
#if CONFIG_IDF_TARGET_ESP32
#define ESP_MPI_USE_MONT_EXP
#endif
/**
* @brief Enable the MPI hardware
*
*/
void esp_mpi_enable_hardware_hw_op( void );
/**
* @brief Disable the MPI hardware
*
*/
void esp_mpi_disable_hardware_hw_op( void );
/**
* @brief Calculate the number of words needed to represent the input word in hardware
*
* @param words The number of words to be represented
*
* @return size_t Number of words required
*/
size_t esp_mpi_hardware_words(size_t words);
/**
* @brief Starts a (X * Y) Mod M calculation in hardware. Rinv and M_prime needs to be precalculated in software.
*
*/
void esp_mpi_mul_mpi_mod_hw_op(const mbedtls_mpi *X, const mbedtls_mpi *Y, const mbedtls_mpi *M, const mbedtls_mpi *Rinv, mbedtls_mpi_uint Mprime, size_t hw_words);
/**
* @brief Starts a (X * Y) calculation in hardware.
*
*/
void esp_mpi_mul_mpi_hw_op(const mbedtls_mpi *X, const mbedtls_mpi *Y, size_t num_words);
/**
* @brief Special-case of (X * Y), where we use hardware montgomery mod
multiplication to calculate result where either A or B are >2048 bits so
can't use the standard multiplication method.
*
*/
void esp_mpi_mult_mpi_failover_mod_mult_hw_op(const mbedtls_mpi *X, const mbedtls_mpi *Y, size_t num_words);
/**
* @brief Read out the result from the previous calculation.
*
*/
void esp_mpi_read_result_hw_op(mbedtls_mpi *Z, size_t z_words);
#ifdef ESP_MPI_USE_MONT_EXP
/**
* @brief Starts a montgomery multiplication calculation in hardware
*
*/
int esp_mont_hw_op(mbedtls_mpi* Z, const mbedtls_mpi* X, const mbedtls_mpi* Y, const mbedtls_mpi* M,
mbedtls_mpi_uint Mprime,
size_t hw_words,
bool again);
#else
/**
* @brief Starts a (X ^ Y) Mod M calculation in hardware. Rinv and M_prime needs to be precalculated in software.
*
*/
void esp_mpi_exp_mpi_mod_hw_op(const mbedtls_mpi *X, const mbedtls_mpi *Y, const mbedtls_mpi *M, const mbedtls_mpi *Rinv, mbedtls_mpi_uint Mprime, size_t hw_words);
#endif //ESP_MPI_USE_MONT_EXP
#endif