[catapult] - Copy Telemetry's gsutilz over to third_party.

third_party/gsutil/third_party/pyasn1-modules/tools/x509dump.py

Index: third_party/gsutil/third_party/pyasn1-modules/tools/x509dump.py
diff --git a/third_party/gsutil/third_party/pyasn1-modules/tools/x509dump.py b/third_party/gsutil/third_party/pyasn1-modules/tools/x509dump.py
new file mode 100755
index 0000000000000000000000000000000000000000..64cba7e3053cbf478cbe128b1c357fdc2c5de76f
--- /dev/null
+++ b/third_party/gsutil/third_party/pyasn1-modules/tools/x509dump.py
@@ -0,0 +1,40 @@
+#!/usr/bin/python
+#
+# Read ASN.1/PEM X.509 certificates on stdin, parse each into plain text,
+# then build substrate from it
+#
+from pyasn1.codec.der import decoder, encoder
+from pyasn1_modules import rfc2459, pem
+import sys
+
+if len(sys.argv) != 1:
+    print("""Usage:
+$ cat CACertificate.pem | %s
+$ cat userCertificate.pem | %s""" % (sys.argv[0], sys.argv[0]))
+    sys.exit(-1)
+    
+certType = rfc2459.Certificate()
+
+certCnt = 0
+
+while 1:
+    idx, substrate = pem.readPemBlocksFromFile(
+                        sys.stdin, ('-----BEGIN CERTIFICATE-----',
+                                    '-----END CERTIFICATE-----')
+                     )
+    if not substrate:
+        break
+        
+    cert, rest = decoder.decode(substrate, asn1Spec=certType)
+
+    if rest: substrate = substrate[:-len(rest)]
+        
+    print(cert.prettyPrint())
+
+    assert encoder.encode(cert, defMode=False) == substrate or \
+           encoder.encode(cert, defMode=True) == substrate, \
+           'cert recode fails'
+        
+    certCnt = certCnt + 1
+    
+print('*** %s PEM cert(s) de/serialized' % certCnt)