DSA signing support (this is mostly skeuomorf's work, credit to him)
diff --git a/docs/hazmat/backends/interfaces.rst b/docs/hazmat/backends/interfaces.rst
index 6833f22..f363b54 100644
--- a/docs/hazmat/backends/interfaces.rst
+++ b/docs/hazmat/backends/interfaces.rst
@@ -345,6 +345,19 @@
1.0.0 and the key size is larger than 1024; older OpenSSL versions
do not support keys larger than 1024 bits.
+ .. method:: create_dsa_signature_ctx(private_key, algorithm)
+
+ :param private_key: An instance of a
+ :class:`~cryptography.hazmat.primitives.interfaces.DSAPrivateKey`
+ provider.
+
+ :param algorithm: An instance of a
+ :class:`~cryptography.hazmat.primitives.interfaces.HashAlgorithm`
+ provider
+
+ :returns:
+ :class:`~cryptography.hazmat.primitives.interfaces.AsymmetricSignatureContext`
+
.. method:: create_dsa_verification_ctx(public_key, signature, algorithm)
:param public_key: An instance of a