70 lines
2.3 KiB
Python
70 lines
2.3 KiB
Python
"""passbook crypto models"""
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from binascii import hexlify
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from typing import Optional
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from uuid import uuid4
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from cryptography.hazmat.backends import default_backend
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from cryptography.hazmat.primitives import hashes
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from cryptography.hazmat.primitives.asymmetric.rsa import RSAPrivateKey
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from cryptography.hazmat.primitives.serialization import load_pem_private_key
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from cryptography.x509 import Certificate, load_pem_x509_certificate
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from django.db import models
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from django.utils.translation import gettext_lazy as _
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from passbook.lib.models import CreatedUpdatedModel
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class CertificateKeyPair(CreatedUpdatedModel):
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"""CertificateKeyPair that can be used for signing or encrypting if `key_data`
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is set, otherwise it can be used to verify remote data."""
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kp_uuid = models.UUIDField(primary_key=True, editable=False, default=uuid4)
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name = models.TextField()
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certificate_data = models.TextField(help_text=_("PEM-encoded Certificate data"))
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key_data = models.TextField(
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help_text=_(
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"Optional Private Key. If this is set, you can use this keypair for encryption."
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),
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blank=True,
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default="",
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)
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_cert: Optional[Certificate] = None
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_key: Optional[RSAPrivateKey] = None
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@property
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def certificate(self) -> Certificate:
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"""Get python cryptography Certificate instance"""
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if not self._cert:
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self._cert = load_pem_x509_certificate(
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self.certificate_data.encode("utf-8"), default_backend()
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)
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return self._cert
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@property
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def private_key(self) -> Optional[RSAPrivateKey]:
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"""Get python cryptography PrivateKey instance"""
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if not self._key:
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self._key = load_pem_private_key(
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str.encode("\n".join([x.strip() for x in self.key_data.split("\n")])),
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password=None,
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backend=default_backend(),
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)
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return self._key
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@property
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def fingerprint(self) -> str:
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"""Get SHA256 Fingerprint of certificate_data"""
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return hexlify(self.certificate.fingerprint(hashes.SHA256()), ":").decode(
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"utf-8"
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)
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def __str__(self) -> str:
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return f"Certificate-Key Pair {self.name} {self.fingerprint}"
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class Meta:
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verbose_name = _("Certificate-Key Pair")
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verbose_name_plural = _("Certificate-Key Pairs")
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