Adding hmac-secret tests.

Signed-off-by: Pol Henarejos <pol.henarejos@cttc.es>

tests/utils.py

@@ -0,0 +1,59 @@
+from fido2.webauthn import AttestedCredentialData
+import random
+import string
+import secrets
+import math
+
+def verify(MC, GA, client_data_hash):
+    credential_data = AttestedCredentialData(MC.auth_data.credential_data)
+    GA.verify(client_data_hash, credential_data.public_key)
+
+
+def generate_random_user():
+    # https://www.w3.org/TR/webauthn/#user-handle
+    user_id_length = random.randint(1, 64)
+    user_id = secrets.token_bytes(user_id_length)
+
+    # https://www.w3.org/TR/webauthn/#dictionary-pkcredentialentity
+    name = "User name"
+    icon = "https://www.w3.org/TR/webauthn/"
+    display_name = "Displayed " + name
+
+    return {"id": user_id, "name": name, "icon": icon, "displayName": display_name}
+
+counter = 1
+def generate_user_maximum():
+    """
+    Generate RK with the maximum lengths of the fields, according to the minimal requirements of the FIDO2 spec
+    """
+    global counter
+
+    # https://www.w3.org/TR/webauthn/#user-handle
+    user_id_length = 64
+    user_id = secrets.token_bytes(user_id_length)
+
+    # https://www.w3.org/TR/webauthn/#dictionary-pkcredentialentity
+    name = ''.join(random.choice(string.ascii_uppercase + string.ascii_lowercase + string.digits) for _ in range(64))
+
+    name = f"{counter}: {name}"
+    icon = "https://www.w3.org/TR/webauthn/" + "A" * 128
+    display_name = "Displayed " + name
+
+    name = name[:64]
+    display_name = display_name[:64]
+    icon = icon[:128]
+
+    counter += 1
+
+    return {"id": user_id, "name": name, "icon": icon, "displayName": display_name}
+
+def shannon_entropy(data):
+    s = 0.0
+    total = len(data)
+    for x in range(0, 256):
+        freq = data.count(x)
+        p = freq / total
+        if p > 0:
+            s -= p * math.log2(p)
+    return s
+