Convert HMAC to Rust (#8781)

1 files changed, 4 insertions, 62 deletions

diff --git a/src/cryptography/hazmat/primitives/hmac.py b/src/cryptography/hazmat/primitives/hmac.py
index 6627f5749..a9442d59a 100644
--- a/src/cryptography/hazmat/primitives/hmac.py
+++ b/src/cryptography/hazmat/primitives/hmac.py
@@ -4,68 +4,10 @@
 
 from __future__ import annotations
 
-import typing
-
-from cryptography import utils
-from cryptography.exceptions import AlreadyFinalized
-from cryptography.hazmat.backends.openssl.hmac import _HMACContext
+from cryptography.hazmat.bindings._rust import openssl as rust_openssl
 from cryptography.hazmat.primitives import hashes
 
+__all__ = ["HMAC"]
 
-class HMAC(hashes.HashContext):
-    _ctx: typing.Optional[_HMACContext]
-
-    def __init__(
-        self,
-        key: bytes,
-        algorithm: hashes.HashAlgorithm,
-        backend: typing.Any = None,
-        ctx=None,
-    ):
-        if not isinstance(algorithm, hashes.HashAlgorithm):
-            raise TypeError("Expected instance of hashes.HashAlgorithm.")
-        self._algorithm = algorithm
-
-        self._key = key
-        if ctx is None:
-            from cryptography.hazmat.backends.openssl.backend import (
-                backend as ossl,
-            )
-
-            self._ctx = ossl.create_hmac_ctx(key, self.algorithm)
-        else:
-            self._ctx = ctx
-
-    @property
-    def algorithm(self) -> hashes.HashAlgorithm:
-        return self._algorithm
-
-    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 copy(self) -> HMAC:
-        if self._ctx is None:
-            raise AlreadyFinalized("Context was already finalized.")
-        return HMAC(
-            self._key,
-            self.algorithm,
-            ctx=self._ctx.copy(),
-        )
-
-    def finalize(self) -> bytes:
-        if self._ctx is None:
-            raise AlreadyFinalized("Context was already finalized.")
-        digest = self._ctx.finalize()
-        self._ctx = None
-        return digest
-
-    def verify(self, signature: bytes) -> None:
-        utils._check_bytes("signature", signature)
-        if self._ctx is None:
-            raise AlreadyFinalized("Context was already finalized.")
-
-        ctx, self._ctx = self._ctx, None
-        ctx.verify(signature)
+HMAC = rust_openssl.hmac.HMAC
+hashes.HashContext.register(HMAC)