Initial commit of AthonetTools

venv/lib/python3.10/site-packages/nacl/bindings/crypto_shorthash.py

@@ -0,0 +1,81 @@
+# Copyright 2016 Donald Stufft and individual contributors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+
+import nacl.exceptions as exc
+from nacl._sodium import ffi, lib
+from nacl.exceptions import ensure
+
+
+has_crypto_shorthash_siphashx24 = bool(
+    lib.PYNACL_HAS_CRYPTO_SHORTHASH_SIPHASHX24
+)
+
+BYTES: int = lib.crypto_shorthash_siphash24_bytes()
+KEYBYTES: int = lib.crypto_shorthash_siphash24_keybytes()
+
+XBYTES = 0
+XKEYBYTES = 0
+
+if has_crypto_shorthash_siphashx24:
+    XBYTES = lib.crypto_shorthash_siphashx24_bytes()
+    XKEYBYTES = lib.crypto_shorthash_siphashx24_keybytes()
+
+
+def crypto_shorthash_siphash24(data: bytes, key: bytes) -> bytes:
+    """Compute a fast, cryptographic quality, keyed hash of the input data
+
+    :param data:
+    :type data: bytes
+    :param key: len(key) must be equal to
+                :py:data:`.KEYBYTES` (16)
+    :type key: bytes
+    """
+    if len(key) != KEYBYTES:
+        raise exc.ValueError(
+            "Key length must be exactly {} bytes".format(KEYBYTES)
+        )
+    digest = ffi.new("unsigned char[]", BYTES)
+    rc = lib.crypto_shorthash_siphash24(digest, data, len(data), key)
+
+    ensure(rc == 0, raising=exc.RuntimeError)
+    return ffi.buffer(digest, BYTES)[:]
+
+
+def crypto_shorthash_siphashx24(data: bytes, key: bytes) -> bytes:
+    """Compute a fast, cryptographic quality, keyed hash of the input data
+
+    :param data:
+    :type data: bytes
+    :param key: len(key) must be equal to
+                :py:data:`.XKEYBYTES` (16)
+    :type key: bytes
+    :raises nacl.exceptions.UnavailableError: If called when using a
+        minimal build of libsodium.
+    """
+    ensure(
+        has_crypto_shorthash_siphashx24,
+        "Not available in minimal build",
+        raising=exc.UnavailableError,
+    )
+
+    if len(key) != XKEYBYTES:
+        raise exc.ValueError(
+            "Key length must be exactly {} bytes".format(XKEYBYTES)
+        )
+    digest = ffi.new("unsigned char[]", XBYTES)
+    rc = lib.crypto_shorthash_siphashx24(digest, data, len(data), key)
+
+    ensure(rc == 0, raising=exc.RuntimeError)
+    return ffi.buffer(digest, XBYTES)[:]