diff options
| author | Paul Kehrer <paul.l.kehrer@gmail.com> | 2014-11-27 10:29:59 -1000 |
|---|---|---|
| committer | Paul Kehrer <paul.l.kehrer@gmail.com> | 2014-11-27 10:29:59 -1000 |
| commit | 65d054d1a9b8b122096d7994fc2fe675c06f423f (patch) | |
| tree | 4d42a91fc6a2a9105f04aa11501adec3999af039 /src | |
| parent | a98f95a14ef6394795b9a34402d41552e43a8101 (diff) | |
| download | cryptography-65d054d1a9b8b122096d7994fc2fe675c06f423f.tar.gz cryptography-65d054d1a9b8b122096d7994fc2fe675c06f423f.tar.bz2 cryptography-65d054d1a9b8b122096d7994fc2fe675c06f423f.zip | |
add decode_rfc6979_signature helper for DSA/ECDSA
Diffstat (limited to 'src')
| -rw-r--r-- | src/cryptography/hazmat/primitives/asymmetric/utils.py | 22 |
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) |