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# 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, encoder
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())
if data[1]:
raise ValueError(
"The signature contains bytes after the end of the ASN.1 sequence."
)
r = int(data[0].getComponentByName('r'))
s = int(data[0].getComponentByName('s'))
return (r, s)
def encode_rfc6979_signature(r, s):
sig = _DSSSigValue()
sig.setComponentByName('r', r)
sig.setComponentByName('s', s)
return encoder.encode(sig)
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