Add signature verification to list retrieval

- Move test data to src
- Verify signatures by calling the Verify method
- Add a customizable parameter to force prehashed signatures

Signed-off-by: jwijenbergh <jeroenwijenbergh@protonmail.com>

1 files changed, 37 insertions, 0 deletions

diff --git a/src/test_data/generate_forged.py b/src/test_data/generate_forged.py
new file mode 100644
index 0000000..843b32d
--- /dev/null
+++ b/src/test_data/generate_forged.py
@@ -0,0 +1,37 @@
+#!/usr/bin/env python3
+
+import hashlib
+import base64
+
+# Hash server_list.json
+
+with open("server_list.json", "rb") as f:
+	b = f.read()
+
+with open("server_list.json.blake2b", "wb") as f:
+	f.write(hashlib.blake2b(b).digest())
+
+# Forge pure signature on hash, see https://github.com/jedisct1/minisign/issues/104
+
+with open("server_list.json.minisig", "rb") as f:
+	siglines = f.readlines()
+
+siglines[0] = b"untrusted comment: this signature has ED changed to Ed\n"
+sig = base64.b64decode(siglines[1])
+siglines[1] = base64.b64encode(b"Ed" + sig[2:]) + b"\n"
+
+with open("server_list.json.forged_pure.minisig", "wb") as f:
+	f.writelines(siglines)
+	# Should now work: minisign -Vm server_list.json.blake2b -x server_list.json.forged_pure.minisig -p public-key
+
+# Try to forge key ID
+
+with open("server_list.json.wrong_key.minisig", "rb") as f:
+	siglines = f.readlines()
+
+siglines[0] = b"untrusted comment: this signature was created with wrong_secret.key but has key ID changed to that of public.key\n"
+sig_wrong = base64.b64decode(siglines[1])
+siglines[1] = base64.b64encode(sig_wrong[:2] + sig[2:2+8] + sig_wrong[2+8:]) + b"\n"
+
+with open("server_list.json.forged_keyid.minisig", "wb") as f:
+	f.writelines(siglines)