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