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Add new, constant time mpi comparison

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This commit is contained in:
Janos Follath 2019-09-05 14:47:19 +01:00
parent c87a54683b
commit e0187b95f0
2 changed files with 105 additions and 0 deletions
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19
include/mbedtls/bignum.h
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@ -484,6 +484,25 @@ int mbedtls_mpi_cmp_abs( const mbedtls_mpi *X, const mbedtls_mpi *Y );
*/
int mbedtls_mpi_cmp_mpi( const mbedtls_mpi *X, const mbedtls_mpi *Y );
/**
* \brief Compare two MPIs in constant time.
*
* \param X The left-hand MPI. This must point to an initialized MPI
* with the same allocated length as Y.
* \param Y The right-hand MPI. This must point to an initialized MPI
* with the same allocated length as X.
* \param ret The result of the comparison:
* \c 1 if \p X is greater than \p Y.
* \c -1 if \p X is lesser than \p Y.
* \c 0 if \p X is equal to \p Y.
*
* \return 0 on success.
* \return MBEDTLS_ERR_MPI_BAD_INPUT_DATA if the allocated length of
* the two input MPIs is not the same.
*/
int mbedtls_mpi_cmp_mpi_ct( const mbedtls_mpi *X, const mbedtls_mpi *Y,
int *ret );
/**
* \brief Compare signed values
*