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: / proc / self / root / lib / python3 / dist-packages / pymacaroons / binders /

Filename : hash_signatures_binder.py

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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)
        )