1 files changed, 49 insertions, 0 deletions
diff --git a/third_party/python/pyasn1-modules/tools/pkcs8dump.py b/third_party/python/pyasn1-modules/tools/pkcs8dump.py
new file mode 100755
index 0000000000..2bb83884a8
--- /dev/null
+++ b/third_party/python/pyasn1-modules/tools/pkcs8dump.py
@@ -0,0 +1,49 @@
+#!/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  bunch of ASN.1/PEM plain/encrypted private keys in PKCS#8 
+# format on stdin, parse each into plain text, then build substrate from it
+#
+from pyasn1.codec.der import decoder, encoder
+from pyasn1_modules import rfc5208, pem
+import sys
+
+if len(sys.argv) != 1:
+    print("""Usage:
+$ cat pkcs8key.pem | %s""" % sys.argv[0])
+    sys.exit(-1)
+
+cnt = 0
+
+while True:
+    idx, substrate = pem.readPemBlocksFromFile(
+        sys.stdin,
+        ('-----BEGIN PRIVATE KEY-----', '-----END PRIVATE KEY-----'),
+        ('-----BEGIN ENCRYPTED PRIVATE KEY-----', '-----END ENCRYPTED PRIVATE KEY-----')
+    )
+    if not substrate:
+        break
+
+    if idx == 0:
+        asn1Spec = rfc5208.PrivateKeyInfo()
+    elif idx == 1:
+        asn1Spec = rfc5208.EncryptedPrivateKeyInfo()
+    else:
+        break
+
+    key, rest = decoder.decode(substrate, asn1Spec=asn1Spec)
+
+    if rest:
+        substrate = substrate[:-len(rest)]
+
+    print(key.prettyPrint())
+
+    assert encoder.encode(key) == substrate, 'pkcs8 recode fails'
+
+    cnt += 1
+
+print('*** %s PKCS#8 key(s) de/serialized' % cnt)