SHA-1 scram name should be SHA1 (and fix typo in error rethrow)

ircrobots/sasl.py

@@ -161,7 +161,7 @@ class SASLContext(ServerContext):
         try:
             algo = SCRAMAlgorithm(algo_str_prep)
         except ValueError:
-            raise ValueError("Unknown SCRAM algorithm '%s'" % algo)
+            raise ValueError("Unknown SCRAM algorithm '%s'" % algo_str_prep)
         scram = SCRAMContext(algo, username, password)
 
         client_first = _b64eb(scram.client_first())

ircrobots/scram.py

@@ -8,7 +8,7 @@ from typing import Dict
 # MD2 has been removed as it's unacceptably weak
 class SCRAMAlgorithm(Enum):
     MD5     = "MD5"
-    SHA_1   = "SHA-1"
+    SHA_1   = "SHA1"
     SHA_224 = "SHA224"
     SHA_256 = "SHA256"
     SHA_384 = "SHA384"