1 files changed, 44 insertions, 0 deletions
diff --git a/third_party/python/pyasn1-modules/tools/x509dump.py b/third_party/python/pyasn1-modules/tools/x509dump.py
new file mode 100755
index 0000000000..2c51c6a516
--- /dev/null
+++ b/third_party/python/pyasn1-modules/tools/x509dump.py
@@ -0,0 +1,44 @@
+#!/usr/bin/env python
+#
+# This file is part of pyasn1-modules software.
+#
+# Copyright (c) 2005-2017, Ilya Etingof <etingof@gmail.com>
+# License: http://pyasn1.sf.net/license.html
+#
+# 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 True:
+    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) == substrate, 'cert recode fails'
+
+    certCnt += 1
+
+print('*** %s PEM cert(s) de/serialized' % certCnt)