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101 lines
3.5 KiB
101 lines
3.5 KiB
#!/usr/bin/env python
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#
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# Copyright (C) 2016 The Android Open Source Project
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#
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# Licensed under the Apache License, Version 2.0 (the 'License');
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an 'AS IS' BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import random
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from OpenSSL import crypto
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from Crypto.PublicKey import RSA
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class Certificate(object):
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cert = None
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key = None
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def __init__(self, cert, key):
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self.cert = cert
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self.key = key
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def cert_pem(self):
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return crypto.dump_certificate(crypto.FILETYPE_PEM, self.cert)
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def key_pem(self):
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return crypto.dump_privatekey(crypto.FILETYPE_PEM, self.key)
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def save_to_file(self, path):
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with open(path, "w") as f:
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f.write(self.cert_pem())
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f.write(self.key_pem())
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def save_cert_to_file(self, path):
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with open(path, "w") as f:
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f.write(self.cert_pem())
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@staticmethod
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def from_file(path):
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with open(path) as f:
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data = f.read()
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cert = crypto.load_certificate(crypto.FILETYPE_PEM, data)
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key = crypto.load_privatekey(crypto.FILETYPE_PEM, data)
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return Certificate(cert, key)
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@staticmethod
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def create(cn, issuer=None, key=None, keysize=2048, digest="sha256",
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notBefore="20150101000000+0000", notAfter="20300101000000+0000",
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additional_extensions=None):
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if key is None:
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key = crypto.PKey()
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key.generate_key(crypto.TYPE_RSA, keysize)
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cert = crypto.X509()
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cert.set_pubkey(key)
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cert.set_version(2)
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cert.set_serial_number(random.randint(0, 2**20))
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cert.set_notBefore(notBefore)
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cert.set_notAfter(notAfter)
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cert.get_subject().CN = cn
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cert.set_issuer(cert.get_subject() if issuer is None else issuer.cert.get_subject())
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# Add the CA=True basic constraint
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basicContraints = crypto.X509Extension("basicConstraints", True, "CA:TRUE")
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cert.add_extensions([basicContraints])
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if additional_extensions is not None:
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cert.add_extensions(additional_extensions)
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signing_key = key if issuer is None else issuer.key
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cert.sign(signing_key, digest)
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return Certificate(cert, key)
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if __name__ == "__main__":
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# Generate test certificates.
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a = Certificate.create("Root A")
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a_sha1 = Certificate.create("Root A", key=a.key, digest="sha1")
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b = Certificate.create("Root B")
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a_to_b = Certificate.create("Root A", b, a.key)
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b_to_a = Certificate.create("Root B", a, b.key)
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leaf1 = Certificate.create("Leaf", a)
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intermediate_a = Certificate.create("intermediate", a)
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intermediate_b = Certificate.create("intermediate", b, intermediate_a.key)
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leaf2 = Certificate.create("Leaf 2", intermediate_a)
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# Save test certificates.
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a.save_cert_to_file("a.pem")
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a_sha1.save_cert_to_file("a_sha1.pem")
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b.save_cert_to_file("b.pem")
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a_to_b.save_cert_to_file("a_to_b.pem")
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b_to_a.save_cert_to_file("b_to_a.pem")
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leaf1.save_cert_to_file("leaf1.pem")
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leaf2.save_cert_to_file("leaf2.pem")
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intermediate_a.save_cert_to_file("intermediate_a.pem")
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intermediate_b.save_cert_to_file("intermediate_b.pem")
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