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-rw-r--r--docs/hazmat/primitives/twofactor.rst6
1 files changed, 6 insertions, 0 deletions
diff --git a/docs/hazmat/primitives/twofactor.rst b/docs/hazmat/primitives/twofactor.rst
index 3912d483..124d0ef5 100644
--- a/docs/hazmat/primitives/twofactor.rst
+++ b/docs/hazmat/primitives/twofactor.rst
@@ -52,6 +52,9 @@ codes (HMAC).
:class:`~cryptography.hazmat.primitives.hashes.SHA256()` or
:class:`~cryptography.hazmat.primitives.hashes.SHA512()` or if the
``length`` parameter is not an integer.
+ :raises cryptography.exceptions.UnsupportedInterface: This is raised if the
+ provided ``backend`` does not implement
+ :class:`~cryptography.hazmat.backends.interfaces.HMACBackend`
.. method:: generate(counter)
@@ -148,6 +151,9 @@ similar to the following code.
:class:`~cryptography.hazmat.primitives.hashes.SHA256()` or
:class:`~cryptography.hazmat.primitives.hashes.SHA512()` or if the
``length`` parameter is not an integer.
+ :raises cryptography.exceptions.UnsupportedInterface: This is raised if the
+ provided ``backend`` does not implement
+ :class:`~cryptography.hazmat.backends.interfaces.HMACBackend`
.. method:: generate(time)