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#!/usr/bin/env python
#
# Read CMC certificate request with wrappers on stdin, parse each into
# plain text, then build substrate from it
#
import sys
from pyasn1.codec.der import decoder
from pyasn1.codec.der import encoder
from pyasn1_modules import pem
from pyasn1_modules import rfc5652
from pyasn1_modules import rfc6402
if len(sys.argv) != 1:
print("""Usage:
$ cat cmc_request.pem | %s""" % (sys.argv[0],))
sys.exit(-1)
reqCnt = 0
substrate = pem.readBase64FromFile(sys.stdin)
_, rest = decoder.decode(substrate, asn1Spec=rfc5652.ContentInfo())
assert not rest
next_layer = rfc5652.id_ct_contentInfo
data = substrate
while next_layer:
if next_layer == rfc5652.id_ct_contentInfo:
layer, rest = decoder.decode(data, asn1Spec=rfc5652.ContentInfo())
assert encoder.encode(layer) == data, 'wrapper recode fails'
assert not rest
print(" * New layer (wrapper):")
print(layer.prettyPrint())
next_layer = layer['contentType']
data = layer['content']
elif next_layer == rfc5652.id_signedData:
layer, rest = decoder.decode(data, asn1Spec=rfc5652.SignedData())
assert encoder.encode(layer) == data, 'wrapper recode fails'
assert not rest
print(" * New layer (wrapper):")
print(layer.prettyPrint())
next_layer = layer['encapContentInfo']['eContentType']
data = layer['encapContentInfo']['eContent']
elif next_layer == rfc6402.id_cct_PKIData:
layer, rest = decoder.decode(data, asn1Spec=rfc6402.PKIData())
assert encoder.encode(layer) == data, 'pkidata recode fails'
assert not rest
print(" * New layer (pkidata):")
print(layer.prettyPrint())
next_layer = None
data = None