Remove oneliner methods in azure and gcp signers

Signed-off-by: Lukas Puehringer <[email protected]>

Author: lukpueh

securesystemslib/signer/_azure_signer.py

@@ -96,9 +96,7 @@ def __init__(self, az_key_uri: str, public_key: SSlibKey):
             az_key_uri,
             credential=cred,
         )
-        self.signature_algorithm = self._get_signature_algorithm(
-            public_key.scheme,
-        )
+        self.signature_algorithm = SIGNATURE_ALGORITHMS[public_key.scheme]
         self.hash_algorithm = public_key.get_hash_algorithm_name()
         self._public_key = public_key
 
@@ -145,11 +143,6 @@ def _create_crypto_client(
             )
             raise e
 
-    @staticmethod
-    def _get_signature_algorithm(scheme: str) -> SignatureAlgorithm:
-        """Return SignatureAlgorithm after parsing the public key"""
-        return SIGNATURE_ALGORITHMS[scheme]
-
     @staticmethod
     def _get_keytype_and_scheme(crv: str) -> tuple[str, str]:
         try:

securesystemslib/signer/_gcp_signer.py

@@ -149,7 +149,7 @@ def import_(cls, gcp_keyid: str) -> tuple[str, SSlibKey]:
         request = {"name": gcp_keyid}
         kms_pubkey = client.get_public_key(request)
         try:
-            keytype, scheme = cls._get_keytype_and_scheme(kms_pubkey.algorithm)
+            keytype, scheme = KEYTYPES_AND_SCHEMES[kms_pubkey.algorithm]
         except KeyError as e:
             raise exceptions.UnsupportedAlgorithmError(
                 f"{kms_pubkey.algorithm} is not a supported signing algorithm"
@@ -161,11 +161,6 @@ def import_(cls, gcp_keyid: str) -> tuple[str, SSlibKey]:
 
         return f"{cls.SCHEME}:{gcp_keyid}", public_key
 
-    @staticmethod
-    def _get_keytype_and_scheme(algorithm: int) -> tuple[str, str]:
-        """Return keytype and scheme for the KMS algorithm enum"""
-        return KEYTYPES_AND_SCHEMES[algorithm]
-
     def sign(self, payload: bytes) -> Signature:
         """Signs payload with Google Cloud KMS.