python – Pyopenssl验证文件签名

我想使用pyopenssl验证下载文件的签名和证书,但文档不清楚,谷歌没有帮助.

我在用户的机器上有一个根CA证书,现在当用户下载文件时,我将随之发送证书和签名.首先,我需要在机器上使用rootCA验证证书,然后我需要用文件验证签名

在openssl中,我可以使用以下来验证ca证书

openssl verify -CAfile <root_pem> <cert_pem>

以及以下验证文件

openssl dgst <algo> -verify <cert_pub_key> -signature <signature> <file>

我正在寻找使用python进行相同的方式,最好是pyopenssl

解决方法:

我一般都在学习OpenSSL,更不用说PyOpenSSL了.话虽如此,我能够使用以下内容验证PyOpenSSL中的文件(第二个命令)：

from OpenSSL.crypto import load_publickey, FILETYPE_PEM, verify, X509

with open(file_to_verify, 'rb') as f:
    file_data = f.read()

with open(signature_filename, 'rb') as f:
    signature = f.read()

with open(public_key_filename) as f:
    public_key_data = f.read()

# load in the publickey file, in my case, I had a .pem file.
# If the file starts with
#     "-----BEGIN PUBLIC KEY-----"
# then it is of the PEM type. The only other FILETYPE is
# "FILETYPE_ASN1".
pkey = load_publickey(FILETYPE_PEM, public_key_data)

# the verify() function expects that the public key is
# wrapped in an X.509 certificate
x509 = X509()
x509.set_pubkey(pkey)

# perform the actual verification. We need the X509 object,
# the signature to verify, the file to verify, and the
# algorithm used when signing.
verify(x509, signature, file_data, 'sha256')

如果验证成功(即它什么都不做),verify()函数将返回None,否则如果出现错误则会引发异常.

标签：python,pyopenssl
来源： https://codeday.me/bug/20191002/1842035.html