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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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2
library/bignum.c
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@ -1893,7 +1893,7 @@ int mbedtls_mpi_inv_mod( mbedtls_mpi *X, const mbedtls_mpi *A, const mbedtls_mpi
int ret;
mbedtls_mpi G, TA, TU, U1, U2, TB, TV, V1, V2;
if( mbedtls_mpi_cmp_int( N, 0 ) <= 0 )
if( mbedtls_mpi_cmp_int( N, 1 ) <= 0 )
return( MBEDTLS_ERR_MPI_BAD_INPUT_DATA );
mbedtls_mpi_init( &TA ); mbedtls_mpi_init( &TU ); mbedtls_mpi_init( &U1 ); mbedtls_mpi_init( &U2 );