From af83bf6712629bd9121d1b28b18dda936f0c28f2 Mon Sep 17 00:00:00 2001
From: Mark Haines <mark.haines@matrix.org>
Date: Mon, 3 Nov 2014 16:35:24 +0000
Subject: [PATCH] Script for checking event hashes

---
 scripts/check_event_hash.py | 43 +++++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)
 create mode 100644 scripts/check_event_hash.py

diff --git a/scripts/check_event_hash.py b/scripts/check_event_hash.py
new file mode 100644
index 0000000000..9fa4452ee6
--- /dev/null
+++ b/scripts/check_event_hash.py
@@ -0,0 +1,43 @@
+from synapse.crypto.event_signing import *
+from syutil.base64util import encode_base64
+
+import argparse
+import hashlib
+import sys
+import json
+
+class dictobj(dict):
+    def __init__(self, *args, **kargs):
+        dict.__init__(self, *args, **kargs)
+        self.__dict__ = self
+
+    def get_dict(self):
+        return dict(self)
+
+
+def main():
+    parser = parser = argparse.ArgumentParser()
+    parser.add_argument("input_json", nargs="?", type=argparse.FileType('r'),
+                        default=sys.stdin)
+    args = parser.parse_args()
+    logging.basicConfig()
+
+    event_json = dictobj(json.load(args.input_json))
+
+    algorithms = {
+        "sha256": hashlib.sha256,
+    }
+
+    for alg_name in event_json.hashes:
+        if check_event_pdu_content_hash(event_json, algorithms[alg_name]):
+            print "PASS content hash %s" % (alg_name,)
+        else:
+            print "FAIL content hash %s" % (alg_name,)
+
+    for algorithm in algorithms.values():
+        name, h_bytes = compute_pdu_event_reference_hash(event_json, algorithm)
+        print "Reference hash %s: %s" % (name, encode_base64(bytes))
+
+if __name__=="__main__":
+    main()
+