Implement get_fingerprint on Keypair

nkms/keystore/keypairs.py

@@ -1,3 +1,5 @@
+import sha3
+
 from typing import Union
 
 from nkms.crypto import api as API
@@ -45,6 +47,14 @@ class Keypair(object):
             return bytes(self.pubkey)
         return self.pubkey.save_key()
 
+    def get_fingerprint(self):
+        """
+        Hashes the key using keccak-256 and returns the hexdigest in bytes.
+
+        :return: Hexdigest fingerprint of key (keccak-256) in bytes
+        """
+        return sha3.keccak_256(bytes(self.pubkey)).hex_digest().encode()
+
 
 class EncryptingKeypair(Keypair):
     """

nkms/keystore/keystore.py

@@ -22,7 +22,6 @@ class KeyStore(object):
     """
     A storage class of cryptographic keys.
     """
-
     kfrag_splitter = BytestringSplitter(Signature, (KFrag, KFRAG_LENGTH))
 
     def __init__(self, sqlalchemy_engine=None):