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-rw-r--r--src/block_template.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/block_template.c b/src/block_template.c
index bc7aa74..c36b316 100644
--- a/src/block_template.c
+++ b/src/block_template.c
@@ -170,7 +170,7 @@ ALGnew(PyObject *self, PyObject *args, PyObject *kwdict)
"Key cannot be the null string");
return NULL;
}
- if (IVlen != BLOCK_SIZE && IVlen != 0)
+ if (IVlen != BLOCK_SIZE && mode != MODE_ECB && mode != MODE_CTR)
{
PyErr_Format(PyExc_ValueError,
"IV must be %i bytes long", BLOCK_SIZE);