#!/usr/bin/env python

import os
import sys
from base64 import b64encode
from uuid import uuid4

try:
    from cryptography import x509
    from cryptography.hazmat.backends import default_backend
    from cryptography.hazmat.primitives import hashes
except ImportError:
    print("Please install cryptography: `pip install cryptography`")
    sys.exit(1)

if len(sys.argv) < 2 or not os.path.exists(sys.argv[1]):
    print("Specify the path to the certificate as the first argument:\n"
          "\tpython %s /path/to/cert" % sys.argv[0].rsplit('/')[-1])
    sys.exit(1)

with open(sys.argv[1], 'rb') as fp:
    _cert_string = fp.read()
    _cert_x509 = x509.load_pem_x509_certificate(_cert_string,
                                                default_backend())
    cert_fp_hash = b64encode(_cert_x509.fingerprint(hashes.SHA1()))
    cert_base64 = _cert_string.replace(b'\n', b'')
    cert_base64 = cert_base64.replace(b'-----BEGIN CERTIFICATE-----', b'')
    cert_base64 = cert_base64.replace(b'-----END CERTIFICATE-----', b'')

print('SHA1 hash of certificate fingerprint: %s' % cert_fp_hash.decode())
print('Key ID: %s' % uuid4())
print('Base64 encoded certificate:\n%s\n' % cert_base64.decode())