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# Read ASN.1/PEM PKCS#7 on stdin, parse it into plain text,
# then build substrate from it
from pyasn1_modules import rfc2315, pem
from pyasn1.codec.der import encoder, decoder
import sys
if len(sys.argv) != 1:
print("""Usage:
$ cat pkcs7Certificate.pem | %s""" % (sys.argv[0],))
sys.exit(-1)
idx, substrate = pem.readPemFromFile(
sys.stdin, ('-----BEGIN PKCS7-----', '-----END PKCS7-----')
)
assert substrate, 'bad PKCS7 data on input'
contentInfo, rest = decoder.decode(substrate, asn1Spec=rfc2315.ContentInfo())
if rest: substrate = substrate[:-len(rest)]
print(contentInfo.prettyPrint())
assert encoder.encode(contentInfo, defMode=False) == substrate or \
encoder.encode(contentInfo, defMode=True) == substrate, \
're-encode fails'
contentType = contentInfo.getComponentByName('contentType')
contentInfoMap = {
(1, 2, 840, 113549, 1, 7, 1): rfc2315.Data(),
(1, 2, 840, 113549, 1, 7, 2): rfc2315.SignedData(),
(1, 2, 840, 113549, 1, 7, 3): rfc2315.EnvelopedData(),
(1, 2, 840, 113549, 1, 7, 4): rfc2315.SignedAndEnvelopedData(),
(1, 2, 840, 113549, 1, 7, 5): rfc2315.DigestedData(),
(1, 2, 840, 113549, 1, 7, 6): rfc2315.EncryptedData()
}
content, _ = decoder.decode(
contentInfo.getComponentByName('content'),
asn1Spec=contentInfoMap[contentType]
)
print(content.prettyPrint())
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