encryption.py

from __future__ import print_function

import math

try:
    input = raw_input
except NameError:
    pass

key = int(math.pi * 1e14)
text = input("Enter text: ")
values = reverse = []


def encryptChar(target):
    # encrytion algorithm
    target = (((target + 42) * key) - 449)
    return target


def decryptChar(target):
    target = (((target + 449) / key) - 42)
    return target


def encrypt(input_text):
    col_values = []
    for i in range(len(input_text)):
        current = ord(input_text[i])
        current = encryptChar(current)
        col_values.append(current)
    return col_values


def decrypt(enc_text):
    col_values = []
    for i in range(len(enc_text)):
        current = int(decryptChar(enc_text[i]))
        current = chr(current)
        col_values.append(current)
    return col_values


def readAndDecrypt(filename):
    file = open(filename, "r")
    data = file.read()
    datalistint = []
    actualdata = []
    datalist = data.split(" ")
    datalist.remove('')
    datalistint = [float(datalist[i]) for i in range(len(datalist))]
    for i in range(len(datalist)):
        current1 = int(decryptChar(datalistint[i]))
        current1 = chr(current1)
        actualdata.append(current1)
    file.close()
    return actualdata


def readAndEncrypt(filename):
    file = open(filename, "r")
    data = file.read()
    datalist = list(data)
    encrypted_list = list()
    encrypted_list_str = list()
    for i in range(len(datalist)):
        current = ord(datalist[i])
        current = encryptChar(current)
        encrypted_list.append(current)
    file.close()
    return encrypted_list


def readAndEncryptAndSave(inp_file, out_file):
    enc_list = readAndEncrypt(inp_file)
    output = open(out_file, "w")
    for i in range(len(enc_list)):
        output.write(str(enc_list[i]) + " ")
    output.close()


def readAndDecryptAndSave(inp_file, out_file):
    dec_list = readAndDecrypt(inp_file)
    output = open(out_file, "w")
    for i in range(len(dec_list)):
        output.write(str(dec_list[i]))
    output.close()


# encryption
for i in range(len(text)):
    current = ord(text[i])
    current = encryptChar(current)
    values.append(current)

# decryption
for i in range(len(text)):
    current = int(decryptChar(values[i]))
    current = chr(current)
    reverse.append(current)
print(reverse)

# saves encrypted in txt file
output = open("encrypted.txt", "w")
for i in range(len(values)):
    output.write(str(values[i]) + " ")
output.close()

# read and decrypts
print(readAndDecrypt("encrypted.txt"))