decode.py

import MyMath
import MyBase


def getPrivateKey (file) : # file Privatekey
	fi = open(file,"r")
	n = int(fi.readline())
	d = int(fi.readline())
	fi.close()
	return n, d

def getCiphertext(file): # file Ciphertext
	fi = open(file,"r")
	C = fi.readline()
	C = C.split(" ")
	C = C[:-1]
	fi.close()
	return C

def decode(n, d, C, base, fileOut): # file PlanintextDecode
	fo = open(fileOut,"w")
	P = ""
	for i in C:
		m = MyMath.powMod(MyBase.toInt(i,64),d,n)
		c = str(m)
		while len(c) % base != 0:
			c = '0' + c
		x = 0
		while x != len(c):
			a = c[x:x+base]
			x+= base
			P+= chr(int(a))
			fo.write(chr(int(a)))
	fo.close()
	return P

def main():
	n, d= getPrivateKey("Data/PrivateKey.txt")
	C= getCiphertext("Data/Ciphertext.txt")
	C= decode(n, d, C, 4, "Data/PlaintextDecode.txt")
	#print(C)

main()