Question

I’m following the RSA algorithm from the Wiki: http://en.wikipedia.org/wiki/RSA_(algorithm)

I am using Python 3.3.0 and I’m trying to do RSA Encryption and I ran into two problems that I don’t know how to do.

In the Encryptions class, my methods all need to be indented one level in to indicate that they are methods of the class and are not global functions.

When the main script asks for input at the end, if I just hit return, an exception is thrown that Python reached an unexpected EOF.

How can I do that ?

My code so far:

Modular.py

def _base_b_convert(n, b):
   if b < 1 or n < 0:
      raise ValueError("Invalid Argument")

   q = n
   a = []
   while q != 0:
      value = int(q % b)
      a.append(value)
      q =int(q / b)
   return a


def mod_exp(base, n, mod):
    if base < 0 or n < 0 or mod < 0:
    raise ValueError("Invalid Argument")
    a = (_base_b_convert(n, 2))
    x = 1
    pow = base % mod
    for i in range(0, len(a)):
    if a[i] == 1:
        x = (x * pow) % mod
    pow = pow**2 % mod
    return x

main.py

from encryptions import Encryptions

def main():
    enc = Encryptions()
    message = enc.encrypt(message)
    print(message)
    print()
    print("Decrypting message:")
    message = enc.decrypt(message)
    print(message)

    input("--Press any key to end--")

if __name__ == '__main__':
    main()

Answer 1

input() in Python 2 is not what you think it is — rather, it evaluates the string inputted as Python code, which is not what you want. Instead, use raw_input.

As for your indentation problem, that’s just Python syntax. Nothing you can do.