expose get_fingerprint() method to BIP32

Closes #36

Author: BenWestgate

bip32/bip32.py

@@ -14,6 +14,7 @@
     _deriv_path_str_to_list,
     _pubkey_is_valid,
     _privkey_is_valid,
+    _pubkey_to_fingerprint,
 )
 
 
@@ -99,6 +100,7 @@ def __init__(
         self.index = index
         self.network = network
 
+    
     def get_extended_privkey_from_path(self, path):
         """Get an extended privkey from a derivation path.
 
@@ -276,6 +278,11 @@ def get_xpub_bytes(self):
             self.network,
         )
 
+    def get_fingerprint(self):
+        """Get the public key fingerprint."""
+        return _pubkey_to_fingerprint(self.pubkey)
+
+
     @classmethod
     def from_xpriv(cls, xpriv):
         """Get a BIP32 "wallet" out of this xpriv