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如何使用wincertstoreCertFile()获取证书的有效期和算法信息

发布时间:2023-12-13 16:15:13

要使用wincertstoreCertFile()函数获取证书的有效期和算法信息,需要经过以下几个步骤:

1. 导入所需的模块和函数:

from datetime import datetime
import certifi
from OpenSSL import crypto

2. 使用wincertstoreCertFile()函数加载证书文件:

with open(cert_file, 'rb') as f:
    cert_content = f.read()
cert = crypto.load_certificate(crypto.FILETYPE_PEM, cert_content)

3. 获取证书的有效期:

not_before = cert.get_notBefore().decode()
not_after = cert.get_notAfter().decode()
valid_from = datetime.strptime(not_before, '%Y%m%d%H%M%SZ')
valid_to = datetime.strptime(not_after, '%Y%m%d%H%M%SZ')

4. 获取证书的算法信息:

signature_algorithm = cert.get_signature_algorithm().decode()
public_key_algorithm = cert.get_pubkey().type()

完整的示例代码如下:

from datetime import datetime
import certifi
from OpenSSL import crypto

def get_cert_info(cert_file):
    with open(cert_file, 'rb') as f:
        cert_content = f.read()
    cert = crypto.load_certificate(crypto.FILETYPE_PEM, cert_content)
    
    not_before = cert.get_notBefore().decode()
    not_after = cert.get_notAfter().decode()
    valid_from = datetime.strptime(not_before, '%Y%m%d%H%M%SZ')
    valid_to = datetime.strptime(not_after, '%Y%m%d%H%M%SZ')
    
    signature_algorithm = cert.get_signature_algorithm().decode()
    public_key_algorithm = cert.get_pubkey().type()
    
    return valid_from, valid_to, signature_algorithm, public_key_algorithm

使用以上代码,可以按照以下方式调用:

cert_file = 'path/to/certificate.pem'
valid_from, valid_to, signature_algorithm, public_key_algorithm = get_cert_info(cert_file)

print('证书有效期从', valid_from, '到', valid_to)
print('证书签名算法:', signature_algorithm)
print('公钥算法:', public_key_algorithm)

请注意,在调用wincertstoreCertFile()函数之前,确保已安装了相应的模块。