Remove securesystemslib.hash

fixes secure-systems-lab#943

* Internal use does not need the additional features (custom blake
  algorithm name support and file hashing), and was replaced by direct
  calls to hashlib.

* External users were updated to no longer require
  `securesystemslib.hash` (theupdateframework/python-tuf#2815,
  in-toto/in-toto#861)

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

Author: lukpueh

securesystemslib/hash.py

@@ -1,10 +1,10 @@
 """Signer implementation for Azure Key Vault"""
 
+import hashlib
 import logging
 from typing import Optional, Tuple
 from urllib import parse
 
-import securesystemslib.hash as sslib_hash
 from securesystemslib.exceptions import UnsupportedLibraryError
 from securesystemslib.signer._key import Key, SSlibKey
 from securesystemslib.signer._signer import SecretsHandler, Signature, Signer
@@ -244,7 +244,7 @@ def sign(self, payload: bytes) -> Signature:
             Signature.
         """
 
-        hasher = sslib_hash.digest(self.hash_algorithm)
+        hasher = hashlib.new(self.hash_algorithm)
         hasher.update(payload)
         digest = hasher.digest()
         response = self.crypto_client.sign(self.signature_algorithm, digest)