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#!/usr/bin/python
#
# Read bunch of ASN.1/PEM plain/encrypted private keys in PKCS#8
# format on stdin, parse each into plain text, then build substrate from it
#
from pyasn1.codec.der import decoder, encoder
from pyasn1_modules import rfc5208, pem
import sys
if len(sys.argv) != 1:
print("""Usage:
$ cat pkcs8key.pem | %s""" % sys.argv[0])
sys.exit(-1)
cnt = 0
while 1:
idx, substrate = pem.readPemBlocksFromFile(sys.stdin, ('-----BEGIN PRIVATE KEY-----', '-----END PRIVATE KEY-----'), ('-----BEGIN ENCRYPTED PRIVATE KEY-----', '-----END ENCRYPTED PRIVATE KEY-----') )
if not substrate:
break
if idx == 0:
asn1Spec = rfc5208.PrivateKeyInfo()
elif idx == 1:
asn1Spec = rfc5208.EncryptedPrivateKeyInfo()
else:
break
key, rest = decoder.decode(substrate, asn1Spec=asn1Spec)
if rest: substrate = substrate[:-len(rest)]
print(key.prettyPrint())
assert encoder.encode(key, defMode=False) == substrate or \
encoder.encode(key, defMode=True) == substrate, \
'pkcs8 recode fails'
cnt = cnt + 1
print('*** %s PKCS#8 key(s) de/serialized' % cnt)
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