mpi: allow conversion of zero-sized buffer.

This causes assertions in uint-buf and int-buf
on an empty buffer argument.

* mpi.c (mp_read_unsigned_bin): Remove len > 0
assertion, because the code works fine for len == 0,
returning the zero mp_int produced by mp_zero.

1 files changed, 1 insertions, 1 deletions

diff --git a/mpi/mpi.c b/mpi/mpi.c
index 5aa3d06f..3b01b6f9 100644
--- a/mpi/mpi.c
+++ b/mpi/mpi.c
@@ -2545,7 +2545,7 @@ mp_err mp_read_unsigned_bin(mp_int *mp, unsigned char *str, size_t len)
   mp_size ix;
   mp_err res;
 
-  ARGCHK(mp != NULL && str != NULL && len > 0, MP_BADARG);
+  ARGCHK(mp != NULL && str != NULL, MP_BADARG);
 
   mp_zero(mp);