| #!/usr/bin/python |
| # |
| # 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.readPemBlocksFromFile( |
| 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()) |
