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-rw-r--r--docs/hazmat/backends/interfaces.rst4
1 files changed, 3 insertions, 1 deletions
diff --git a/docs/hazmat/backends/interfaces.rst b/docs/hazmat/backends/interfaces.rst
index 73011dd0..83ec6f19 100644
--- a/docs/hazmat/backends/interfaces.rst
+++ b/docs/hazmat/backends/interfaces.rst
@@ -133,13 +133,15 @@ A specific ``backend`` may provide one or more of these interfaces.
:returns: ``True`` if the specified ``algorithm`` is supported for HMAC
by this backend, otherwise ``False``.
- .. method:: create_hmac_ctx(algorithm)
+ .. method:: create_hmac_ctx(key, algorithm)
Create a
:class:`~cryptography.hazmat.primitives.hashes.HashContext` that
uses the specified ``algorithm`` to calculate a hash-based message
authentication code.
+ :param bytes key: Secret key as ``bytes``.
+
:param algorithm: An instance of a
:class:`~cryptography.hazmat.primitives.hashes.HashAlgorithm`
provider.