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Abort modular inversion when modulus is one.

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The modular inversion function hangs when provided with the modulus 1. This commit refuses this modulus with a BAD_INPUT error code. It also adds a test for this case.
This commit is contained in:
Hanno Becker
2017-04-18 15:49:39 +01:00
parent a4af1c47d2
commit 4bcb4914c5
3 changed files with 6 additions and 3 deletions
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4
include/mbedtls/bignum.h
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@ -665,8 +665,8 @@ int mbedtls_mpi_gcd( mbedtls_mpi *G, const mbedtls_mpi *A, const mbedtls_mpi *B
*
* \return 0 if successful,
* MBEDTLS_ERR_MPI_ALLOC_FAILED if memory allocation failed,
* MBEDTLS_ERR_MPI_BAD_INPUT_DATA if N is negative or nil
MBEDTLS_ERR_MPI_NOT_ACCEPTABLE if A has no inverse mod N
* MBEDTLS_ERR_MPI_BAD_INPUT_DATA if N is <= 1,
MBEDTLS_ERR_MPI_NOT_ACCEPTABLE if A has no inverse mod N.
*/
int mbedtls_mpi_inv_mod( mbedtls_mpi *X, const mbedtls_mpi *A, const mbedtls_mpi *N );