Add gsutil/third_party to telemetry/third_party/gsutilz/third_party.

tools/telemetry/third_party/gsutilz/third_party/pyasn1-modules/tools/pkcs7dump.py

Index: tools/telemetry/third_party/gsutilz/third_party/pyasn1-modules/tools/pkcs7dump.py
diff --git a/tools/telemetry/third_party/gsutilz/third_party/pyasn1-modules/tools/pkcs7dump.py b/tools/telemetry/third_party/gsutilz/third_party/pyasn1-modules/tools/pkcs7dump.py
new file mode 100755
index 0000000000000000000000000000000000000000..7794871620d33f48b971601d578c3d9b5784fe3c
--- /dev/null
+++ b/tools/telemetry/third_party/gsutilz/third_party/pyasn1-modules/tools/pkcs7dump.py
@@ -0,0 +1,47 @@
+#!/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())