moving to scripts

asq-env/lib/python3.9/site-packages/cryptography/hazmat/primitives/poly1305.py

@@ -0,0 +1,56 @@
+# This file is dual licensed under the terms of the Apache License, Version
+# 2.0, and the BSD License. See the LICENSE file in the root of this repository
+# for complete details.
+
+
+from cryptography import utils
+from cryptography.exceptions import (
+    AlreadyFinalized,
+    UnsupportedAlgorithm,
+    _Reasons,
+)
+
+
+class Poly1305(object):
+    def __init__(self, key: bytes):
+        from cryptography.hazmat.backends.openssl.backend import backend
+
+        if not backend.poly1305_supported():
+            raise UnsupportedAlgorithm(
+                "poly1305 is not supported by this version of OpenSSL.",
+                _Reasons.UNSUPPORTED_MAC,
+            )
+        self._ctx = backend.create_poly1305_ctx(key)
+
+    def update(self, data: bytes) -> None:
+        if self._ctx is None:
+            raise AlreadyFinalized("Context was already finalized.")
+        utils._check_byteslike("data", data)
+        self._ctx.update(data)
+
+    def finalize(self) -> bytes:
+        if self._ctx is None:
+            raise AlreadyFinalized("Context was already finalized.")
+        mac = self._ctx.finalize()
+        self._ctx = None
+        return mac
+
+    def verify(self, tag: bytes) -> None:
+        utils._check_bytes("tag", tag)
+        if self._ctx is None:
+            raise AlreadyFinalized("Context was already finalized.")
+
+        ctx, self._ctx = self._ctx, None
+        ctx.verify(tag)
+
+    @classmethod
+    def generate_tag(cls, key: bytes, data: bytes) -> bytes:
+        p = Poly1305(key)
+        p.update(data)
+        return p.finalize()
+
+    @classmethod
+    def verify_tag(cls, key: bytes, data: bytes, tag: bytes) -> None:
+        p = Poly1305(key)
+        p.update(data)
+        p.verify(tag)