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import binascii
from pymacaroons.binders.base_binder import BaseBinder
from pymacaroons.utils import hmac_concat, truncate_or_pad
class HashSignaturesBinder(BaseBinder):
def __init__(self, root, key=None):
super(HashSignaturesBinder, self).__init__(root)
self.key = key or truncate_or_pad(b'\0')
def bind_signature(self, signature):
return hmac_concat(
self.key,
binascii.unhexlify(self.root.signature_bytes),
binascii.unhexlify(signature)
)