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main.py
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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
Created on Wed Mar 2 15:04:19 2022
@author: victor
"""
import numpy as np
import base64
class AES:
s_box = (
0x63 ,0x7c ,0x77 ,0x7b ,0xf2 ,0x6b ,0x6f ,0xc5 ,0x30 ,0x01 ,0x67 ,0x2b ,0xfe ,0xd7 ,0xab ,0x76,
0xca ,0x82 ,0xc9 ,0x7d ,0xfa ,0x59 ,0x47 ,0xf0 ,0xad ,0xd4 ,0xa2 ,0xaf ,0x9c ,0xa4 ,0x72 ,0xc0,
0xb7 ,0xfd ,0x93 ,0x26 ,0x36 ,0x3f ,0xf7 ,0xcc ,0x34 ,0xa5 ,0xe5 ,0xf1 ,0x71 ,0xd8 ,0x31 ,0x15,
0x04 ,0xc7 ,0x23 ,0xc3 ,0x18 ,0x96 ,0x05 ,0x9a ,0x07 ,0x12 ,0x80 ,0xe2 ,0xeb ,0x27 ,0xb2 ,0x75,
0x09 ,0x83 ,0x2c ,0x1a ,0x1b ,0x6e ,0x5a ,0xa0 ,0x52 ,0x3b ,0xd6 ,0xb3 ,0x29 ,0xe3 ,0x2f ,0x84,
0x53 ,0xd1 ,0x00 ,0xed ,0x20 ,0xfc ,0xb1 ,0x5b ,0x6a ,0xcb ,0xbe ,0x39 ,0x4a ,0x4c ,0x58 ,0xcf,
0xd0 ,0xef ,0xaa ,0xfb ,0x43 ,0x4d ,0x33 ,0x85 ,0x45 ,0xf9 ,0x02 ,0x7f ,0x50 ,0x3c ,0x9f ,0xa8,
0x51 ,0xa3 ,0x40 ,0x8f ,0x92 ,0x9d ,0x38 ,0xf5 ,0xbc ,0xb6 ,0xda ,0x21 ,0x10 ,0xff ,0xf3 ,0xd2,
0xcd ,0x0c ,0x13 ,0xec ,0x5f ,0x97 ,0x44 ,0x17 ,0xc4 ,0xa7 ,0x7e ,0x3d ,0x64 ,0x5d ,0x19 ,0x73,
0x60 ,0x81 ,0x4f ,0xdc ,0x22 ,0x2a ,0x90 ,0x88 ,0x46 ,0xee ,0xb8 ,0x14 ,0xde ,0x5e ,0x0b ,0xdb,
0xe0 ,0x32 ,0x3a ,0x0a ,0x49 ,0x06 ,0x24 ,0x5c ,0xc2 ,0xd3 ,0xac ,0x62 ,0x91 ,0x95 ,0xe4 ,0x79,
0xe7 ,0xc8 ,0x37 ,0x6d ,0x8d ,0xd5 ,0x4e ,0xa9 ,0x6c ,0x56 ,0xf4 ,0xea ,0x65 ,0x7a ,0xae ,0x08,
0xba ,0x78 ,0x25 ,0x2e ,0x1c ,0xa6 ,0xb4 ,0xc6 ,0xe8 ,0xdd ,0x74 ,0x1f ,0x4b ,0xbd ,0x8b ,0x8a,
0x70 ,0x3e ,0xb5 ,0x66 ,0x48 ,0x03 ,0xf6 ,0x0e ,0x61 ,0x35 ,0x57 ,0xb9 ,0x86 ,0xc1 ,0x1d ,0x9e,
0xe1 ,0xf8 ,0x98 ,0x11 ,0x69 ,0xd9 ,0x8e ,0x94 ,0x9b ,0x1e ,0x87 ,0xe9 ,0xce ,0x55 ,0x28 ,0xdf,
0x8c ,0xa1 ,0x89 ,0x0d ,0xbf ,0xe6 ,0x42 ,0x68 ,0x41 ,0x99 ,0x2d ,0x0f ,0xb0 ,0x54 ,0xbb ,0x16
)
r_con = (0x1, 0x2, 0x4, 0x8, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36)
def __init__(self, m: str, key: str, inputHex=False, keyHex=False):
self.c = ''
self.m = m
self.keys = np.empty((10, 16), dtype='<U4')
if inputHex:
self.state = np.array(m, dtype='<U4')
else:
vector = np.array([hex(ord(c)) for c in m], dtype='<U4')
self.state = vector.reshape(4,4).transpose().reshape(16)
if keyHex:
self.key = np.array(key, dtype='<U4')
else:
self.key = np.array([hex(ord(c)) for c in key], dtype='<U4').reshape(4,4).transpose().reshape(16)
def expand_key(self):
# Primera iteración usando la key original
self.keys[0, 0] = hex(int(self.key[0], 0) ^ self.sub_byte(self.key[7]) ^ self.r_con[0])
self.keys[0, 4] = hex(int(self.key[4], 0) ^ self.sub_byte(self.key[11]))
self.keys[0, 8] = hex(int(self.key[8], 0) ^ self.sub_byte(self.key[15]))
self.keys[0, 12] = hex(int(self.key[12], 0) ^ self.sub_byte(self.key[3]))
for i in range(1, 4):
self.keys[0, i] = hex(int(self.key[i], 0) ^ int(self.keys[0, i-1], 0))
self.keys[0, i + 4] = hex(int(self.key[4 + i], 0) ^ int(self.keys[0, 4 + i -1], 0))
self.keys[0, i + 8] = hex(int(self.key[8 + i], 0) ^ int(self.keys[0, 8 + i -1], 0))
self.keys[0, i + 12] = hex(int(self.key[12 + i], 0) ^ int(self.keys[0, 12 + i -1], 0))
# Siguientes iteraciones usando las keys generadas
for nround in range(1, 10):
self.keys[nround, 0] = hex(int(self.keys[nround-1, 0], 0) ^ self.sub_byte(self.keys[nround-1, 7]) ^ self.r_con[nround])
self.keys[nround, 4] = hex(int(self.keys[nround-1, 4], 0) ^ self.sub_byte(self.keys[nround-1, 11]))
self.keys[nround, 8] = hex(int(self.keys[nround-1, 8], 0) ^ self.sub_byte(self.keys[nround-1, 15]))
self.keys[nround, 12] = hex(int(self.keys[nround-1, 12], 0) ^ self.sub_byte(self.keys[nround-1, 3]))
for i in range(1, 4):
self.keys[nround, i] = hex(int(self.keys[nround-1, i], 0) ^ int(self.keys[nround, i -1], 0))
self.keys[nround, i + 4] = hex(int(self.keys[nround-1, 4 + i], 0) ^ int(self.keys[nround, 4 + i -1], 0))
self.keys[nround, i + 8] = hex(int(self.keys[nround-1, 8 + i], 0) ^ int(self.keys[nround, 8 + i -1], 0))
self.keys[nround, i + 12] = hex(int(self.keys[nround-1, 12 + i], 0) ^ int(self.keys[nround, 12 + i -1], 0))
def add_round_key(self, nround: int, initKey=False):
if initKey:
for i in range(16):
self.state[i] = hex(int(self.state[i], 0) ^ int(self.key[i], 0))
else:
for i in range(16):
self.state[i] = hex(int(self.state[i], 0) ^ int(self.keys[nround, i], 0))
def sub_byte(self, index: str):
return self.s_box[ int(index, 0) ]
def sub_bytes(self):
# Sustitución de cada valor en hexadecimal por si correspondiente en la tabla de sustitución
for i in range(16):
self.state[i] = hex(self.s_box[ int(self.state[i], 0) ])
def shift_rows(self):
# Shift right the row i, i times, from i=1..n
for i in range(1,4):
self.state[i*4 : (1+i) * 4] = np.roll(self.state[i*4 : (1+i) * 4], -i)
def GMUL2(self, x: str):
# Multiplicacion Galois por 2
b = int(x, 0)
h = (b >> 7) & 1
out = (b << 1) & 0xff # Haciendo un AND con 0xff, quitamos el bit que haya más a la izquierda del 8o bit
out ^= (h * 0x1b) # XOR con 0 o 0x1B dependiendo si el bit más a la izquieda es 0 o 1
return out
def GMUL3(self, x: str):
# La multiplicación x3 es simplemente Gmul2(x) XOR x
return self.GMUL2(x) ^ int(x, 0)
def mix_columns(self):
# Ejecuta el módulo de MixColumns
for i in range(4):
a1 = hex(self.GMUL2(self.state[i]) ^ self.GMUL3(self.state[4 + i]) ^ int(self.state[8 + i], 0) ^ int(self.state[12 + i], 0))
a2 = hex(int(self.state[i], 0) ^ self.GMUL2(self.state[4 + i]) ^ self.GMUL3(self.state[8 + i]) ^ int(self.state[12 + i], 0))
a3 = hex(int(self.state[i], 0) ^ int(self.state[4 + i], 0) ^ self.GMUL2(self.state[8 + i]) ^ self.GMUL3(self.state[12 + i]))
a4 = hex(self.GMUL3(self.state[i]) ^ int(self.state[4 + i], 0) ^ int(self.state[8 + i], 0) ^ self.GMUL2(self.state[12 + i]))
self.state[i] = a1
self.state[4 + i] = a2
self.state[8 + i] = a3
self.state[12 + i] = a4
def show_key(self):
c = ''
vector = self.key.reshape(4,4).transpose().reshape(16)
for i, valor in enumerate(vector):
if i % 4 == 0: c += ' '
if len(valor) == 3:
c += '0'
c += valor[2:]
print(c)
def show_state(self):
# Muestra el estado de nuestra matriz
print('\n-----------------------------')
for i in range(4):
print(self.state[i*4:4*(1+i)])
print('-----------------------------')
def state2base64(self):
c = self.state2hex()
b64 = base64.b64encode(c)
print(f'Base64: {b64}')
def state2hex(self):
print('Matriz de estado:')
c = ''
vector = self.state.reshape(4,4).transpose().reshape(16)
for i, valor in enumerate(vector):
if len(valor) == 3:
c += '0'
c += valor[2:]
print(f'Hex: {c}')
return c
def encrypt(self):
self.expand_key()
self.add_round_key(0, initKey=True)
for i in range(0,9):
self.sub_bytes()
self.shift_rows()
self.mix_columns()
self.add_round_key(i)
self.sub_bytes()
self.shift_rows()
self.add_round_key(-1)
self.muestra_hex()