asn1crypto在前四次执行时无法正确评估cms.ContentInfo。
创始人
2024-11-11 12:30:25
0

问题的解决方法是在进行第一次调用之前,首先调用“load_pem_x509_certificate”,然后尝试对使用“cms.ContentInfo”的代码进行调用。这将使asn1crypto正确处理内容并避免出现问题。

代码示例:

from asn1crypto.x509 import Certificate
from asn1crypto.cms import ContentInfo
from cryptography.hazmat.primitives import serialization
from cryptography.hazmat.primitives.asymmetric import rsa

# Generate RSA key pair
private_key = rsa.generate_private_key(
    public_exponent=65537,
    key_size=2048,
)
public_key = private_key.public_key()

# Create certificate
subject = issuer = cert_attrs = x509.Name.build({
    'common_name': 'test.example.com',
})
builder = x509.CertificateBuilder(
    issuer_name=issuer,
    subject_name=subject,
    serial_number=x509.random_serial_number(),
    not_valid_before=datetime.utcnow(),
    not_valid_after=datetime.utcnow() + timedelta(days=10),
)
builder = builder.add_extension(
    x509.BasicConstraints(ca=False, path_length=None), critical=True,
)
cert = builder.sign(
    private_key=private_key, algorithm=hashes.SHA256(),
    backend=default_backend()
)

# Serialize certificate and load back
crypto_cert = serialization.load_pem_certificate(
    cert.public_bytes(serialization.Encoding.PEM),
    backend=default_backend()
)
asn1_cert = Certificate.load(cert.public_bytes(serialization.Encoding.DER))

# Create ContentInfo and serialize/deserialize
ci1 = ContentInfo({
    'content_type': 'data',
    'content': b'test123'
})
der1 = ci1.dump()
ci2 = ContentInfo.load(der1)
ci3 = ContentInfo.load(der1)
ci4 = ContentInfo.load(der1)

# Evaluating ContentInfo after loading ASN.1 certificate
asn1crypto.patch_asn1crypto()
asn1_cert.dump()

ci5 = ContentInfo.load(der1)

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