24 lines
824 B
Python
24 lines
824 B
Python
from cryptography.hazmat.backends import default_backend
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from cryptography.hazmat.primitives import hashes
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class CBlock:
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data = None
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previousHash = None
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previousBlock = None
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def __init__(self, data, previousBlock):
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self.data = data
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self.previousBlock = previousBlock
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if previousBlock != None:
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self.previousHash = previousBlock.computeHash()
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def computeHash(self):
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digest = hashes.Hash(hashes.SHA256(), backend=default_backend())
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digest.update(bytes(str(self.data),'utf8'))
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digest.update(bytes(str(self.previousHash),'utf8'))
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return digest.finalize()
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def is_valid(self):
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if self.previousBlock == None:
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return True
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return self.previousBlock.computeHash() == self.previousHash |