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-rw-r--r--docs/hazmat/primitives/asymmetric/dsa.rst49
1 files changed, 49 insertions, 0 deletions
diff --git a/docs/hazmat/primitives/asymmetric/dsa.rst b/docs/hazmat/primitives/asymmetric/dsa.rst
index 2819bbdb..5cee5705 100644
--- a/docs/hazmat/primitives/asymmetric/dsa.rst
+++ b/docs/hazmat/primitives/asymmetric/dsa.rst
@@ -118,6 +118,55 @@ DSA
``subgroup_order``, ``generator``, or ``y``
do not match the bounds specified in `FIPS 186-4`_.
+ .. method:: verifier(signature, algorithm, backend)
+
+ .. versionadded:: 0.4
+
+ Verify data was signed by the private key associated with this public
+ key.
+
+ .. code-block:: pycon
+
+ >>> from cryptography.hazmat.backends import default_backend
+ >>> from cryptography.hazmat.primitives import hashes
+ >>> from cryptography.hazmat.primitives.asymmetric import dsa
+ >>> parameters = dsa.DSAParameters.generate(
+ ... key_size=1024,
+ ... backend=default_backend()
+ ... )
+ >>> private_key = dsa.DSAPrivateKey.generate(
+ ... parameters=parameters,
+ ... backend=default_backend()
+ ... )
+ >>> signer = private_key.signer(
+ ... hashes.SHA256(),
+ ... default_backend()
+ ... )
+ >>> data= b"this is some data I'd like to sign"
+ >>> signer.update(data)
+ >>> signature = signer.finalize()
+ >>> public_key = private_key.public_key()
+ >>> verifier = public_key.verifier(
+ ... signature,
+ ... hashes.SHA256(),
+ ... default_backend()
+ ... )
+ >>> verifier.update(data)
+ >>> verifier.verify()
+
+ :param bytes signature: The signature to verify in DER encoding as
+ specified in :rfc:`6979`.
+
+ :param algorithm: An instance of a
+ :class:`~cryptography.hazmat.primitives.interfaces.HashAlgorithm`
+ provider.
+
+ :param backend: A
+ :class:`~cryptography.hazmat.backends.interfaces.DSABackend`
+ provider.
+
+ :returns:
+ :class:`~cryptography.hazmat.primitives.interfaces.AsymmetricVerificationContext`
.. _`DSA`: https://en.wikipedia.org/wiki/Digital_Signature_Algorithm
.. _`public-key`: https://en.wikipedia.org/wiki/Public-key_cryptography