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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 enum import Enum
from cryptography import x509
from cryptography.hazmat.backends import _get_backend
from cryptography.hazmat.primitives import hashes, serialization
from cryptography.hazmat.primitives.asymmetric import ec, rsa
from cryptography.utils import _check_byteslike
def load_pem_pkcs7_certificates(data):
backend = _get_backend(None)
return backend.load_pem_pkcs7_certificates(data)
def load_der_pkcs7_certificates(data):
backend = _get_backend(None)
return backend.load_der_pkcs7_certificates(data)
class PKCS7SignatureBuilder(object):
def __init__(self, data=None, signers=[], additional_certs=[]):
self._data = data
self._signers = signers
self._additional_certs = additional_certs
def set_data(self, data):
_check_byteslike("data", data)
if self._data is not None:
raise ValueError("data may only be set once")
return PKCS7SignatureBuilder(data, self._signers)
def add_signer(self, certificate, private_key, hash_algorithm):
if not isinstance(
hash_algorithm,
(
hashes.SHA1,
hashes.SHA224,
hashes.SHA256,
hashes.SHA384,
hashes.SHA512,
),
):
raise TypeError(
"hash_algorithm must be one of hashes.SHA1, SHA224, "
"SHA256, SHA384, or SHA512"
)
if not isinstance(certificate, x509.Certificate):
raise TypeError("certificate must be a x509.Certificate")
if not isinstance(
private_key, (rsa.RSAPrivateKey, ec.EllipticCurvePrivateKey)
):
raise TypeError("Only RSA & EC keys are supported at this time.")
return PKCS7SignatureBuilder(
self._data,
self._signers + [(certificate, private_key, hash_algorithm)],
)
def add_certificate(self, certificate):
if not isinstance(certificate, x509.Certificate):
raise TypeError("certificate must be a x509.Certificate")
return PKCS7SignatureBuilder(
self._data, self._signers, self._additional_certs + [certificate]
)
def sign(self, encoding, options, backend=None):
if len(self._signers) == 0:
raise ValueError("Must have at least one signer")
if self._data is None:
raise ValueError("You must add data to sign")
options = list(options)
if not all(isinstance(x, PKCS7Options) for x in options):
raise ValueError("options must be from the PKCS7Options enum")
if encoding not in (
serialization.Encoding.PEM,
serialization.Encoding.DER,
serialization.Encoding.SMIME,
):
raise ValueError(
"Must be PEM, DER, or SMIME from the Encoding enum"
)
# Text is a meaningless option unless it is accompanied by
# DetachedSignature
if (
PKCS7Options.Text in options
and PKCS7Options.DetachedSignature not in options
):
raise ValueError(
"When passing the Text option you must also pass "
"DetachedSignature"
)
if PKCS7Options.Text in options and encoding in (
serialization.Encoding.DER,
serialization.Encoding.PEM,
):
raise ValueError(
"The Text option is only available for SMIME serialization"
)
# No attributes implies no capabilities so we'll error if you try to
# pass both.
if (
PKCS7Options.NoAttributes in options
and PKCS7Options.NoCapabilities in options
):
raise ValueError(
"NoAttributes is a superset of NoCapabilities. Do not pass "
"both values."
)
backend = _get_backend(backend)
return backend.pkcs7_sign(self, encoding, options)
class PKCS7Options(Enum):
Text = "Add text/plain MIME type"
Binary = "Don't translate input data into canonical MIME format"
DetachedSignature = "Don't embed data in the PKCS7 structure"
NoCapabilities = "Don't embed SMIME capabilities"
NoAttributes = "Don't embed authenticatedAttributes"
NoCerts = "Don't embed signer certificate"