first commit

2026-09-14 23:22:10 +09:00
commit 9f9c8fb69b
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+import typing as t
+import json
+import hashlib
+from collections import OrderedDict
+from ..util import to_bytes, urlsafe_b64encode
+
+
+def calculate_thumbprint(
+    value: dict[str, t.Any],
+    digest_method: t.Literal["sha256", "sha384", "sha512"] = "sha256",
+) -> str:
+    """Calculate the thumbprint value of a Key, per RFC 7638.
+
+    .. code-block:: python
+
+        from joserfc import jwk
+
+        jwk.thumbprint({
+            'kty': 'oct',
+            'k': 'sTBpI_oCHSyW-n0exSwhzNHwU9FGRioPauxWA84bnRU',
+        })
+        # 'DCdRGGDKvhAJgmVlCp6tosc2T9ELtd30S_15vn8bhrI'
+    """
+    sorted_fields = sorted(value.keys())
+    data = OrderedDict()
+    for k in sorted_fields:
+        data[k] = value[k]
+    json_data = json.dumps(data, ensure_ascii=True, separators=(",", ":"))
+    hash_value = hashlib.new(digest_method, to_bytes(json_data))
+    digest_data = hash_value.digest()
+    return urlsafe_b64encode(digest_data).decode("utf-8")