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-rw-r--r--tools/certtools.py10
1 files changed, 10 insertions, 0 deletions
diff --git a/tools/certtools.py b/tools/certtools.py
index 939d9f1..2c97dfb 100644
--- a/tools/certtools.py
+++ b/tools/certtools.py
@@ -668,3 +668,13 @@ def verify_inclusion_proof(inclusion_proof, index, treesize, leafhash):
assert len(nodes_for_index(index, treesize)) == len(inclusion_proof)
(_, hash) = reduce(lambda e1, e2: combine_two_hashes(e1, e2, treesize), chain)
return hash
+
+def extract_original_entry(entry):
+ leaf_input = base64.decodestring(entry["leaf_input"])
+ (leaf_cert, timestamp, issuer_key_hash) = unpack_mtl(leaf_input)
+ extra_data = base64.decodestring(entry["extra_data"])
+ if issuer_key_hash != None:
+ (precert, extra_data) = extract_precertificate(extra_data)
+ leaf_cert = precert
+ certchain = decode_certificate_chain(extra_data)
+ return ([leaf_cert] + certchain, timestamp, issuer_key_hash)