progress in removing core

onionr/onionrcrypto/cryptoutils/__init__.py

@@ -1,5 +1,6 @@
-from . import safecompare, replayvalidation, randomshuffle
+from . import safecompare, replayvalidation, randomshuffle, verifypow
 
 replay_validator = replayvalidation.replay_timestamp_validation
 random_shuffle = randomshuffle.random_shuffle
-safe_compare = safecompare.safe_compare
+safe_compare = safecompare.safe_compare
+verify_POW = verifypow.verify_POW

onionr/onionrcrypto/cryptoutils/verifypow.py

@@ -0,0 +1,36 @@
+from .. import hashers
+import config, onionrproofs, logger
+def verify_POW(blockContent):
+    '''
+        Verifies the proof of work associated with a block
+    '''
+    retData = False
+
+    dataLen = len(blockContent)
+
+    try:
+        blockContent = blockContent.encode()
+    except AttributeError:
+        pass
+
+    blockHash = hashers.sha3_hash(blockContent)
+    try:
+        blockHash = blockHash.decode() # bytes on some versions for some reason
+    except AttributeError:
+        pass
+    
+    difficulty = onionrproofs.getDifficultyForNewBlock(blockContent, ourBlock=False)
+    
+    if difficulty < int(config.get('general.minimum_block_pow')):
+        difficulty = int(config.get('general.minimum_block_pow'))
+    mainHash = '0000000000000000000000000000000000000000000000000000000000000000'#nacl.hash.blake2b(nacl.utils.random()).decode()
+    puzzle = mainHash[:difficulty]
+
+    if blockHash[:difficulty] == puzzle:
+        # logger.debug('Validated block pow')
+        retData = True
+    else:
+        logger.debug("Invalid token, bad proof")
+
+    return retData
+