使用起来相当简单。这未经测试，但应该可以工作：
# load OpenSSL.crypto
from OpenSSL import crypto
# open it, using password. Supply/read your own from stdin.
p12 = crypto.load_pkcs12(open("/path/to/cert.p12", 'rb').read(), passwd)
# get varIoUs properties of said file.
# note these are PyOpenSSL objects, not strings although you
# can convert them to PEM-encoded strings.
p12.get_certificate() # (signed) certificate object
p12.get_privatekey() # private key.
p12.get_ca_certificates() # ca chain.
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