Python read text file as binary? -

i trying build encryption program in python 2.7. read binary file , use key encrypt it. however, ran problem. files image files , executables read hex values. however, text files not using open(). if run

file=open("myfile.txt", "rb")

out=file.read()

it still comes out text. i'm on windows 7, not linux think may make difference. there way read binary file (including text files), not image , executable files?

take @ below code .also has many points you

from hashlib import md5 crypto.cipher import aes crypto import random  def derive_key_and_iv(password, salt, key_length, iv_length):     d = d_i = ''     while len(d) < key_length + iv_length:         d_i = md5(d_i + password + salt).digest()         d += d_i     return d[:key_length], d[key_length:key_length+iv_length]  def encrypt(in_file, out_file, password, key_length=32):     bs = aes.block_size     salt = random.new().read(bs - len('salted__'))     key, iv = derive_key_and_iv(password, salt, key_length, bs)     cipher = aes.new(key, aes.mode_cbc, iv)     out_file.write('salted__' + salt)     finished = false     while not finished:         chunk = in_file.read(1024 * bs)         if len(chunk) == 0 or len(chunk) % bs != 0:             padding_length = (bs - len(chunk) % bs) or bs             chunk += padding_length * chr(padding_length)             finished = true         out_file.write(cipher.encrypt(chunk))  def decrypt(in_file, out_file, password, key_length=32):     bs = aes.block_size     salt = in_file.read(bs)[len('salted__'):]     key, iv = derive_key_and_iv(password, salt, key_length, bs)     cipher = aes.new(key, aes.mode_cbc, iv)     next_chunk = ''     finished = false     while not finished:         chunk, next_chunk = next_chunk, cipher.decrypt(in_file.read(1024 * bs))         if len(next_chunk) == 0:             padding_length = ord(chunk[-1])             chunk = chunk[:-padding_length]             finished = true         out_file.write(chunk) 

usage

with open(in_filename, 'rb') in_file, open(out_filename, 'wb') out_file:     encrypt(in_file, out_file, password) open(in_filename, 'rb') in_file, open(out_filename, 'wb') out_file:     decrypt(in_file, out_file, password)