diff options
| -rw-r--r-- | mpi/mpi-inv.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/mpi/mpi-inv.c b/mpi/mpi-inv.c index b76263047..361c57ea4 100644 --- a/mpi/mpi-inv.c +++ b/mpi/mpi-inv.c @@ -165,6 +165,11 @@ mpi_invm( MPI x, MPI a, MPI n ) int sign; int odd ; + if (!mpi_cmp_ui (a, 0)) + return 0; /* Inverse does not exists. */ + if (!mpi_cmp_ui (n, 1)) + return 0; /* Inverse does not exists. */ + u = mpi_copy(a); v = mpi_copy(n); |