Exported hashing functions to a separate util file

hash_util.py

Author: manustays

blockchain.py

@@ -1,8 +1,9 @@
 from functools import reduce
-import hashlib
-import json
 from collections import OrderedDict
 
+from hash_util import hash_block, hash_str_256
+
+
 # Configure Reward received for a successful mining of a block
 MINING_REWARD = 10
 
@@ -29,18 +30,6 @@
 
 
 
-def hash_block(block):
-	"""Returns the SHA256 hash of the block as a string
-
-	Arguments:
-		:block: The block to hash
-	"""
-	# Convert string to UTF8 with encode()
-	# Return string representation of SHA256 with hexdigest()
-	# The "sort_keys=True" ensures that order of data remains same during multiple hashing of same block
-	return hashlib.sha256(json.dumps(block, sort_keys=True).encode()).hexdigest()
-
-
 def valid_proof(transaction, last_hash, proof):
 	"""Returns True, if the proof (nonce) is valid a proof-of-work,
 	i.e., if it satisfies the proof-of-work condition of generating
@@ -52,7 +41,7 @@ def valid_proof(transaction, last_hash, proof):
 		:proof: The Nounce number that is to be checked
 	"""
 	guess = (str(transaction) + str(last_hash) + str(proof)).encode()	# Combine and UTF8 encode
-	guess_hash = hashlib.sha256(guess).hexdigest()
+	guess_hash = hash_str_256(guess)
 	print("GUESS HASH: ", guess_hash)
 	return guess_hash[:POW_LEADING_ZEROS] == ('0' * POW_LEADING_ZEROS)
 

hash_util.py

@@ -0,0 +1,23 @@
+import hashlib
+import json
+
+
+def hash_str_256(str):
+	"""Returns SHA256 hash of a string as string
+
+	Arguments:
+		:str: The string to hash
+	"""
+	return hashlib.sha256(str).hexdigest()
+
+
+def hash_block(block):
+	"""Returns the SHA256 hash of the block as a string
+
+	Arguments:
+		:block: The block to hash
+	"""
+	# Convert string to UTF8 with encode()
+	# Return string representation of SHA256 with hexdigest()
+	# The "sort_keys=True" ensures that order of data remains same during multiple hashing of same block
+	return hash_str_256(json.dumps(block, sort_keys=True).encode())