Add support for RFC 3274 (#36)

* Add support for RFC 3274

3 files changed, 111 insertions, 2 deletions

diff --git a/pyasn1_modules/rfc3274.py b/pyasn1_modules/rfc3274.py
new file mode 100644
index 0000000..bf8a7a6
--- /dev/null
+++ b/pyasn1_modules/rfc3274.py
@@ -0,0 +1,48 @@
+#
+# This file is part of pyasn1-modules software.
+#
+# Created by Russ Housley with assistance from asn1ate v.0.6.0.
+#
+# Copyright (c) 2019, Vigil Security, LLC
+# License: http://snmplabs.com/pyasn1/license.html
+#
+# CMS Compressed Data Content Type
+#
+# ASN.1 source from:
+# https://www.rfc-editor.org/rfc/rfc3274.txt
+#
+
+from pyasn1.type import namedtype
+from pyasn1.type import univ
+
+from pyasn1_modules import rfc5280
+from pyasn1_modules import rfc5652
+
+
+class CompressionAlgorithmIdentifier(rfc5280.AlgorithmIdentifier):
+    pass
+
+
+# The CMS Compressed Data Content Type
+
+id_ct_compressedData = univ.ObjectIdentifier('1.2.840.113549.1.9.16.1.9')
+
+class CompressedData(univ.Sequence):
+    pass
+
+CompressedData.componentType = namedtype.NamedTypes(
+    namedtype.NamedType('version', rfc5652.CMSVersion()), # Always set to 0
+    namedtype.NamedType('compressionAlgorithm', CompressionAlgorithmIdentifier()),
+    namedtype.NamedType('encapContentInfo', rfc5652.EncapsulatedContentInfo())
+)
+
+
+# Algorithm identifier for the zLib Compression Algorithm
+# This includes cpa_zlibCompress as defined in RFC 6268,
+# from https://www.rfc-editor.org/rfc/rfc6268.txt
+
+id_alg_zlibCompress = univ.ObjectIdentifier('1.2.840.113549.1.9.16.3.8')
+
+cpa_zlibCompress = rfc5280.AlgorithmIdentifier()
+cpa_zlibCompress['algorithm'] = id_alg_zlibCompress
+# cpa_zlibCompress['parameters'] are absent
\ No newline at end of file
diff --git a/pyasn1_modules/rfc3565.py b/pyasn1_modules/rfc3565.py
index 2cac273..c4b742d 100644
--- a/pyasn1_modules/rfc3565.py
+++ b/pyasn1_modules/rfc3565.py
@@ -1,8 +1,8 @@
 # Copyright (c) 2019, Vigil Security, LLC
 # License: http://snmplabs.com/pyasn1/license.html
 #
-# Use of the Elliptic Curve Diffie-Hellman Key Agreement Algorithm
-# with X25519 and X448 in the Cryptographic Message Syntax (CMS)
+# Use of the Advanced Encryption Standard (AES) Encryption
+#   Algorithm in the Cryptographic Message Syntax (CMS)
 #
 # ASN.1 source from:
 # https://www.rfc-editor.org/rfc/rfc3565.txt
diff --git a/tests/test_rfc3274.py b/tests/test_rfc3274.py
new file mode 100644
index 0000000..fbf44a2
--- /dev/null
+++ b/tests/test_rfc3274.py
@@ -0,0 +1,61 @@
+#
+# This file is part of pyasn1-modules software.
+#
+# Created by Russ Housley
+# Copyright (c) 2019, Vigil Security, LLC
+# License: http://snmplabs.com/pyasn1/license.html
+#
+
+import sys
+
+from pyasn1.codec.der.decoder import decode as der_decode
+from pyasn1.codec.der.encoder import encode as der_encode
+
+from pyasn1_modules import pem
+from pyasn1_modules import rfc3274
+from pyasn1_modules import rfc5652
+
+try:
+    import unittest2 as unittest
+except ImportError:
+    import unittest
+
+
+class CompressedDataTestCase(unittest.TestCase):
+    compressed_data_pem_text = """\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+"""
+
+    def setUp(self):
+        self.asn1Spec = rfc5652.ContentInfo()
+
+    def testDerCodec(self):
+        substrate = pem.readBase64fromText(self.compressed_data_pem_text)
+        asn1Object, rest = der_decode(substrate, asn1Spec=self.asn1Spec)
+        assert not rest
+        assert asn1Object.prettyPrint()
+        assert der_encode(asn1Object) == substrate
+
+        assert asn1Object['contentType'] == rfc3274.id_ct_compressedData
+        cd, rest = der_decode(asn1Object['content'], asn1Spec=rfc3274.CompressedData())
+        assert not rest
+        assert cd.prettyPrint()
+        assert der_encode(cd) == asn1Object['content']
+
+        assert cd['compressionAlgorithm']['algorithm'] == rfc3274.id_alg_zlibCompress
+        assert cd['encapContentInfo']['eContentType'] == rfc5652.id_data
+
+suite = unittest.TestLoader().loadTestsFromModule(sys.modules[__name__])
+
+if __name__ == '__main__':
+    unittest.TextTestRunner(verbosity=2).run(suite)