diff options
Diffstat (limited to 'mpi')
| -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 5d269466..15fa58ff 100644 --- a/mpi/mpi-inv.c +++ b/mpi/mpi-inv.c @@ -165,6 +165,11 @@ gcry_mpi_invm( gcry_mpi_t x, gcry_mpi_t a, gcry_mpi_t 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); |