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Source code for

# -*- coding: utf-8 -*-
"""Private keys for the security serializer."""
from __future__ import absolute_import, unicode_literals

from cryptography.hazmat.backends import default_backend
from cryptography.hazmat.primitives import serialization
from cryptography.hazmat.primitives.asymmetric import padding
from kombu.utils.encoding import ensure_bytes

from .utils import reraise_errors

__all__ = ('PrivateKey',)

[docs]class PrivateKey(object): """Represents a private key.""" def __init__(self, key, password=None): with reraise_errors( 'Invalid private key: {0!r}', errors=(ValueError,) ): self._key = serialization.load_pem_private_key( ensure_bytes(key), password=password, backend=default_backend())
[docs] def sign(self, data, digest): """Sign string containing data.""" with reraise_errors('Unable to sign data: {0!r}'): padd = padding.PSS( mgf=padding.MGF1(digest), salt_length=padding.PSS.MAX_LENGTH) return self._key.sign(ensure_bytes(data), padd, digest)