otp.py

#!/usr/bin/python3

import sys

MSGS = []

MSGS.append('315c4eeaa8b5f8aaf9174145bf43e1784b8fa00dc71d885a804e5ee9fa40b16349c146fb778cdf2d3aff021dfff5b403b510d0d0455468aeb98622b137dae857553ccd8883a7bc37520e06e515d22c954eba5025b8cc57ee59418ce7dc6bc41556bdb36bbca3e8774301fbcaa3b83b220809560987815f65286764703de0f3d524400a19b159610b11ef3e')
MSGS.append('234c02ecbbfbafa3ed18510abd11fa724fcda2018a1a8342cf064bbde548b12b07df44ba7191d9606ef4081ffde5ad46a5069d9f7f543bedb9c861bf29c7e205132eda9382b0bc2c5c4b45f919cf3a9f1cb74151f6d551f4480c82b2cb24cc5b028aa76eb7b4ab24171ab3cdadb8356f')
MSGS.append('32510ba9a7b2bba9b8005d43a304b5714cc0bb0c8a34884dd91304b8ad40b62b07df44ba6e9d8a2368e51d04e0e7b207b70b9b8261112bacb6c866a232dfe257527dc29398f5f3251a0d47e503c66e935de81230b59b7afb5f41afa8d661cb')
MSGS.append('32510ba9aab2a8a4fd06414fb517b5605cc0aa0dc91a8908c2064ba8ad5ea06a029056f47a8ad3306ef5021eafe1ac01a81197847a5c68a1b78769a37bc8f4575432c198ccb4ef63590256e305cd3a9544ee4160ead45aef520489e7da7d835402bca670bda8eb775200b8dabbba246b130f040d8ec6447e2c767f3d30ed81ea2e4c1404e1315a1010e7229be6636aaa')
MSGS.append('3f561ba9adb4b6ebec54424ba317b564418fac0dd35f8c08d31a1fe9e24fe56808c213f17c81d9607cee021dafe1e001b21ade877a5e68bea88d61b93ac5ee0d562e8e9582f5ef375f0a4ae20ed86e935de81230b59b73fb4302cd95d770c65b40aaa065f2a5e33a5a0bb5dcaba43722130f042f8ec85b7c2070')
MSGS.append('32510bfbacfbb9befd54415da243e1695ecabd58c519cd4bd2061bbde24eb76a19d84aba34d8de287be84d07e7e9a30ee714979c7e1123a8bd9822a33ecaf512472e8e8f8db3f9635c1949e640c621854eba0d79eccf52ff111284b4cc61d11902aebc66f2b2e436434eacc0aba938220b084800c2ca4e693522643573b2c4ce35050b0cf774201f0fe52ac9f26d71b6cf61a711cc229f77ace7aa88a2f19983122b11be87a59c355d25f8e4')
MSGS.append('32510bfbacfbb9befd54415da243e1695ecabd58c519cd4bd90f1fa6ea5ba47b01c909ba7696cf606ef40c04afe1ac0aa8148dd066592ded9f8774b529c7ea125d298e8883f5e9305f4b44f915cb2bd05af51373fd9b4af511039fa2d96f83414aaaf261bda2e97b170fb5cce2a53e675c154c0d9681596934777e2275b381ce2e40582afe67650b13e72287ff2270abcf73bb028932836fbdecfecee0a3b894473c1bbeb6b4913a536ce4f9b13f1efff71ea313c8661dd9a4ce')
MSGS.append('315c4eeaa8b5f8bffd11155ea506b56041c6a00c8a08854dd21a4bbde54ce56801d943ba708b8a3574f40c00fff9e00fa1439fd0654327a3bfc860b92f89ee04132ecb9298f5fd2d5e4b45e40ecc3b9d59e9417df7c95bba410e9aa2ca24c5474da2f276baa3ac325918b2daada43d6712150441c2e04f6565517f317da9d3')
MSGS.append('271946f9bbb2aeadec111841a81abc300ecaa01bd8069d5cc91005e9fe4aad6e04d513e96d99de2569bc5e50eeeca709b50a8a987f4264edb6896fb537d0a716132ddc938fb0f836480e06ed0fcd6e9759f40462f9cf57f4564186a2c1778f1543efa270bda5e933421cbe88a4a52222190f471e9bd15f652b653b7071aec59a2705081ffe72651d08f822c9ed6d76e48b63ab15d0208573a7eef027')
MSGS.append('466d06ece998b7a2fb1d464fed2ced7641ddaa3cc31c9941cf110abbf409ed39598005b3399ccfafb61d0315fca0a314be138a9f32503bedac8067f03adbf3575c3b8edc9ba7f537530541ab0f9f3cd04ff50d66f1d559ba520e89a2cb2a83')
MSGS.append('32510ba9babebbbefd001547a810e67149caee11d945cd7fc81a05e9f85aac650e9052ba6a8cd8257bf14d13e6f0a803b54fde9e77472dbff89d71b57bddef121336cb85ccb8f3315f4b52e301d16e9f52f904')


def strxor(a, b):
    '''
    xor two strings of different lengths
    :param a: first string
    :param b: second string
    '''
    if len(a) > len(b):
        return "".join([chr(ord(x) ^ ord(y)) for (x, y) in zip(a[:len(b)], b)])
    else:
        return "".join([chr(ord(x) ^ ord(y)) for (x, y) in zip(a, b[:len(a)])])


def random(size=16):
    return open("/dev/urandom").read(size)


def hexconv(func):
    '''
    Un decorador algo inutil, pero que sirve a modo ilustrativo
    Habria sido mejor incluir cada funcionalidad propia de cada funcion en la propia funcion
    :param func: la funcion a decorar
    '''
    def f(*args, **kw):
        print()
        if func.__name__ == 'encrypt':
            result = func(*args, **kw)
            print('Resultado: Texto encriptado hexadecimal:\n' + result.encode('hex'))
        elif func.__name__ == 'decrypt':
            print('Entrada: Texto  encriptado hexadecimal:')
            if 'cipher' in kw:
                print(kw['cipher'].encode('hex'))
            elif len(args) >= 2:
                print(args[1].encode('hex'))
            result = func(*args, **kw)
        print()
        return result
    return f


@hexconv
def encrypt(key, msg):
    c = strxor(key, msg)
    print()
    return c


@hexconv
def decrypt(key, cipher):
    p = strxor(key, cipher)
    print()
    print(p)


def xorCompare(i=0, j=0, c1=' ', c2=' ', fast=True):
    if c1 == ' ' and c2 == ' ':
        c1 = MSGS[i].decode('hex')
        c2 = MSGS[j].decode('hex')

    if fast:
        return strxor(c1, c2)
    else:  # Caracter por caracter
        result = ''
        for x, y in zip(c1, c2):
            print(str(x) + '(+)' + str(y) + ' = ' + strxor(x, y))
            result += strxor(x, y)
        return result


def procesa(cad, hexa=False):
    '''
    Recibe una cadena y saca una interpretacion ascii obviando caracteres no alfabeticos
    :param cad: cadena
    :param hexa: True si hexadecimal, False en caso contrario
    '''
    if hexa:
        cad = cad.decode('hex')

    cadena = ''
    for x in cad:
        if x == ' ':
            cadena += '_'
        elif x == '\x00':
            cadena += '='
        elif not x.isalpha():
            cadena += '.'
        else:
            cadena += chr(ord(x))
    return cadena


def exp(w, r=9):
    cadtotal = []
    for q in range(0, r + 1):
        if(w != q):
            """print str(w)+') ', procesa(MSGS[w], True)
            print '(+)'
            print str(q)+') ', procesa(MSGS[q], True)
            print '-----------------------------------'"""
            cadtotal.append(xorCompare(w, q))
    return cadtotal


def main():
    key = random(1024)
    ciphertexts = [encrypt(key, msg) for msg in MSGS]