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Add modular exponentiation to bignum core

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Signed-off-by: Janos Follath <janos.follath@arm.com>
This commit is contained in:
Janos Follath
2022-09-30 14:13:14 +01:00
parent 0fc88779ec
commit b6673f0f19
2 changed files with 158 additions and 0 deletions
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23
library/bignum_core.h
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@@ -496,6 +496,29 @@ int mbedtls_mpi_core_fill_random( mbedtls_mpi_uint *X, size_t X_limbs,
/* BEGIN MERGE SLOT 1 */
/**
* \brief Perform a modular exponentiation with secret exponent:
* X = A^E mod N
*
* \param[out] X The destination MPI, as a little endian array of length
* \p limbs.
* \param[in] A The base MPI, as a little endian array of length \p limbs.
* \param[in] N The modulus, as a little endian array of length \p limbs.
* \param limbs The number of limbs in \p X, \p A, \p N, \p RR.
* \param[in] E The exponent, as a little endian array of length \p E_limbs.
* \param E_limbs The number of limbs in \p E.
* \param[in] RR The precomputed residue of 2^{2*biL} modulo N, as a little
* endian array of length \p limbs.
*
* \return \c 0 if successful.
* \return #MBEDTLS_ERR_MPI_ALLOC_FAILED if a memory allocation failed.
*/
int mbedtls_mpi_core_exp_mod( mbedtls_mpi_uint *X,
const mbedtls_mpi_uint *A,
const mbedtls_mpi_uint *N, size_t limbs,
const mbedtls_mpi_uint *E, size_t E_limbs,
const mbedtls_mpi_uint *RR );
/* END MERGE SLOT 1 */
/* BEGIN MERGE SLOT 2 */