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PrivateKey.py
58 lines (41 loc) · 1.4 KB
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PrivateKey.py
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from Crypto.Signature import pss
from Crypto.PublicKey import RSA
from Message import Message
from PublicKey import PublicKey
import copy
class PrivateKey:
"Class maintaining private keys"""
def __init__(self,key):
""" generates an element of PublicKey from a key
as defined in Crypto.PublicKey"""
self.privateKey= key
def __copy__(self):
return PrivateKey(self.privateKey)
def __repr__(self):
return str(self.privateKey.export_key())
def __hash__(self):
return hash(str(self))
def __eq__(self,other):
return self.privateKey == other.privateKey
def toPublicKey(self):
return PublicKey(self.privateKey.publickey())
def sign(self,message):
"""Signs a message using the current private key"""
return pss.new(self.privateKey).sign(message.toSHA256Hash())
def generatePrivateKey():
"""Generates a random private key"""
return PrivateKey(RSA.generate(2048))
def test():
"""Test cases """
prk= generatePrivateKey()
print("Private key generated = ",prk)
msg = Message()
msg.addInteger(13)
msg.addPublicKey(RSA.generate(2048).publickey())
print("Message = ",msg)
keyForSigning = RSA.generate(2048)
privateKeyForSigning= PrivateKey(keyForSigning)
signature = privateKeyForSigning.sign(msg)
print("Signature=",signature)
if __name__== "__main__":
test()