Add CMC-related modules

Modules have been generated using asn1ate, with manual fixes to link up
different RFCs.

1 files changed, 56 insertions, 0 deletions

diff --git a/tools/cmcdump.py b/tools/cmcdump.py
new file mode 100755
index 0000000..bce48b1
--- /dev/null
+++ b/tools/cmcdump.py
@@ -0,0 +1,56 @@
+#!/usr/bin/env python
+#
+# Read CMC certificate request with wrappers on stdin, parse each into
+# plain text, then build substrate from it
+#
+from pyasn1.codec.der import decoder, encoder
+from pyasn1_modules import rfc5652, rfc6402, pem
+import sys
+
+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