1 files changed, 22 insertions, 0 deletions
diff --git a/src/cryptography/hazmat/primitives/asymmetric/utils.py b/src/cryptography/hazmat/primitives/asymmetric/utils.py
new file mode 100644
index 00000000..5e35b3f6
--- /dev/null
+++ b/src/cryptography/hazmat/primitives/asymmetric/utils.py
@@ -0,0 +1,22 @@
+# This file is dual licensed under the terms of the Apache License, Version
+# 2.0, and the BSD License. See the LICENSE file in the root of this repository
+# for complete details.
+
+from __future__ import absolute_import, division, print_function
+
+from pyasn1.codec.der import decoder
+from pyasn1.type import namedtype, univ
+
+
+class _DSSSigValue(univ.Sequence):
+    componentType = namedtype.NamedTypes(
+        namedtype.NamedType('r', univ.Integer()),
+        namedtype.NamedType('s', univ.Integer())
+    )
+
+
+def decode_rfc6979_signature(signature):
+    data = decoder.decode(signature, asn1Spec=_DSSSigValue())
+    r = int(data[0].getComponentByName('r'))
+    s = int(data[0].getComponentByName('s'))
+    return (r, s)