From d0c0ab627445f1dcb8eb3dcdb7c6bda3809a088d Mon Sep 17 00:00:00 2001
From: Magnus Ahltorp <map@kth.se>
Date: Wed, 24 Sep 2014 01:14:19 +0200
Subject: submitcert.py: Get submitted entry from log and compare

---
 tools/certtools.py  | 30 +++++++++++++++++++++++++++++-
 tools/submitcert.py | 19 +++++++++++++++++++
 2 files changed, 48 insertions(+), 1 deletion(-)

diff --git a/tools/certtools.py b/tools/certtools.py
index fa7f6ac..48e7b41 100644
--- a/tools/certtools.py
+++ b/tools/certtools.py
@@ -63,7 +63,7 @@ def get_proof_by_hash(baseurl, hash, tree_size):
         print params
         result = \
           urllib2.urlopen(baseurl + "ct/v1/get-proof-by-hash?" + params).read()
-        return result
+        return json.loads(result)
     except urllib2.HTTPError, e:
         print e.read()
         sys.exit(1)
@@ -72,6 +72,15 @@ def tls_array(data, length_len):
     length_bytes = struct.pack(">Q", len(data))[-length_len:]
     return length_bytes + data
 
+def unpack_tls_array(packed_data, length_len):
+    padded_length = ["\x00"] * 8
+    padded_length[-length_len:] = packed_data[:length_len]
+    (length,) = struct.unpack(">Q", "".join(padded_length))
+    unpacked_data = packed_data[length_len:length_len+length]
+    assert len(unpacked_data) == length
+    rest_data = packed_data[length_len+length:]
+    return (unpacked_data, rest_data)
+
 def add_chain(baseurl, submission):
     try:
         return json.loads(urllib2.urlopen(baseurl + "ct/v1/add-chain",
@@ -79,3 +88,22 @@ def add_chain(baseurl, submission):
     except urllib2.HTTPError, e:
         print e.read()
         sys.exit(1)
+
+def get_entries(baseurl, start, end):
+    try:
+        params = urllib.urlencode({"start":start, "end":end})
+        result = urllib2.urlopen(baseurl + "ct/v1/get-entries?" + params).read()
+        return json.loads(result)
+    except urllib2.HTTPError, e:
+        print e.read()
+        sys.exit(1)
+
+def decode_certificate_chain(packed_certchain):
+    (unpacked_certchain, rest) = unpack_tls_array(packed_certchain, 3)
+    assert len(rest) == 0
+    certs = []
+    while len(unpacked_certchain):
+        (cert, rest) = unpack_tls_array(unpacked_certchain, 3)
+        certs.append(cert)
+        unpacked_certchain = rest
+    return certs
diff --git a/tools/submitcert.py b/tools/submitcert.py
index 229d36c..7844dda 100755
--- a/tools/submitcert.py
+++ b/tools/submitcert.py
@@ -36,6 +36,8 @@ if lookup_in_log:
     leaf_type = struct.pack(">b", 0)
     merkle_tree_leaf = version + leaf_type + timestamped_entry
 
+    print "merkle_tree_leaf:", base64.b64encode(merkle_tree_leaf)
+
     leaf_hash = hashlib.sha256()
     leaf_hash.update(struct.pack(">b", 0))
     leaf_hash.update(merkle_tree_leaf)
@@ -48,3 +50,20 @@ if lookup_in_log:
     proof = get_proof_by_hash(baseurl, leaf_hash.digest(), sth["tree_size"])
 
     print proof
+
+    leaf_index = proof["leaf_index"]
+
+    entries = get_entries(baseurl, leaf_index, leaf_index)
+
+    fetched_entry = entries["entries"][0]
+
+    print fetched_entry
+
+    print "does the leaf_input of the fetched entry match what we calculated:", \
+      base64.decodestring(fetched_entry["leaf_input"]) == merkle_tree_leaf
+
+    extra_data = fetched_entry["extra_data"]
+
+    certchain = decode_certificate_chain(base64.decodestring(extra_data))
+
+    print [base64.b64encode(cert) for cert in certchain]
-- 
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