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      1 #!/usr/bin/env python
      2 # coding: utf-8
      3 #
      4 # This file is part of pyasn1-modules software.
      5 #
      6 # Created by Stanisaw Pitucha with asn1ate tool.
      7 # Copyright (c) 2005-2017, Ilya Etingof <etingof (at] gmail.com>
      8 # License: http://pyasn1.sf.net/license.html
      9 #
     10 # Read ASN.1/PEM X.509 certificates on stdin, parse each into plain text,
     11 # then build substrate from it (using RFC5280)
     12 #
     13 import sys
     14 
     15 from pyasn1.codec.der import decoder
     16 from pyasn1.codec.der import encoder
     17 
     18 from pyasn1_modules import pem
     19 from pyasn1_modules import rfc5280
     20 
     21 if len(sys.argv) != 1:
     22     print("""Usage:
     23 $ cat CACertificate.pem | %s
     24 $ cat userCertificate.pem | %s""" % (sys.argv[0], sys.argv[0]))
     25     sys.exit(-1)
     26 
     27 certType = rfc5280.Certificate()
     28 
     29 certCnt = 0
     30 
     31 while 1:
     32     idx, substrate = pem.readPemBlocksFromFile(
     33         sys.stdin, ('-----BEGIN CERTIFICATE-----',
     34                     '-----END CERTIFICATE-----')
     35     )
     36     if not substrate:
     37         break
     38 
     39     cert, rest = decoder.decode(substrate, asn1Spec=certType)
     40 
     41     if rest:
     42         substrate = substrate[:-len(rest)]
     43 
     44     print(cert.prettyPrint())
     45 
     46     assert encoder.encode(cert) == substrate, 'cert recode fails'
     47 
     48     certCnt += 1
     49 
     50 print('*** %s PEM cert(s) de/serialized' % certCnt)
     51