; Programa escrito en TASM para sumar todos los números de un arreglo.

MODEL Tiny
DATASEG
	lista DB  1,2,3,4 ; es igual a 0A (10, en decimal)
	suma  DB  0
	NREP  EQU 4

CODESEG
	ORG 100h
start:
	LEA SI, lista
	LEA DI, suma
	MOV CX, nrep
	XOR DL, DL

repetir:
	MOV AL, [SI]
	ADD DL, AL
	INC SI

LOOP repetir
	MOV [DI], DL

END start

#!/usr/bin/env python

from Crypto.Cipher import AES

def _convert2bytes(s):
	return s.encode() if not (isinstance(s, bytes)) else s

def encrypt(plaintext, password):
	password = _convert2bytes(password)
	plaintext = _convert2bytes(plaintext)

	cipher = AES.new(password, AES.MODE_GCM)
	nonce = cipher.nonce
	ciphertext, tag = cipher.encrypt_and_digest(plaintext)

	return nonce+tag+ciphertext

def decrypt(ciphertext, password):
	password = _convert2bytes(password)

	nonce = ciphertext[:16]
	tag = ciphertext[16:32]
	ciphertext = ciphertext[32:]
	
	descipher = AES.new(password, AES.MODE_GCM, nonce=nonce)

	return descipher.decrypt_and_verify(ciphertext, tag)

>>> import aes_gcm
>>> key = ("1"*32).encode()
>>> plaintext = "Hello world!"
>>> ciphertext = aes_gcm.encrypt(plaintext.encode(), key)
>>> ciphertext
b"{\xf5$'\x08\xc9\xa1\xdb\x0e\xc9D\x1cm#\xf6\x912g@+\xbe\xe1\xce\xc4\xe6\xb9=Q\t\xe5\xbbV\xb6s\xf4\x9c8\xd34\xee\xee\xecP\xed"
>>> decrypted = aes_gcm.decrypt(ciphertext, key)
>>> decrypted
b'Hello world!'
>>> decrypted.decode() == plaintext
True
>>>

>>> key = b'0' + key[1:]
>>> key
b'01111111111111111111111111111111'
>>> decrypted = aes_gcm.decrypt(ciphertext, key)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/tmp/aes_gcm.py", line 27, in decrypt
    return descipher.decrypt_and_verify(ciphertext, tag)
  File "/home/dtxdf/.local/lib/python3.8/site-packages/Crypto/Cipher/_mode_gcm.py", line 567, in decrypt_and_verify
    self.verify(received_mac_tag)
  File "/home/dtxdf/.local/lib/python3.8/site-packages/Crypto/Cipher/_mode_gcm.py", line 508, in verify
    raise ValueError("MAC check failed")
ValueError: MAC check failed
>>>

#!/usr/bin/env python

from Crypto.Cipher import AES
from Crypto.Util.Padding import pad, unpad

def _convert2bytes(s):
	return s.encode() if not (isinstance(s, bytes)) else s

def encrypt(plaintext, password):
	password = _convert2bytes(password)
	plaintext = _convert2bytes(plaintext)

	cipher = AES.new(password, AES.MODE_CBC)
	ciphertext = cipher.encrypt(pad(plaintext, AES.block_size))

	return cipher.iv + ciphertext

def decrypt(ciphertext, password):
	password = _convert2bytes(password)

	iv = ciphertext[:16]
	ciphertext = ciphertext[16:]
	
	descipher = AES.new(password, AES.MODE_CBC, iv=iv)

	return unpad(descipher.decrypt(ciphertext), AES.block_size)

>>> import aes_cbc
>>> key = ("1"*32).encode()
>>> plaintext = "Hello world!"
>>> ciphertext = aes_cbc.encrypt(plaintext, key)
>>> ciphertext
b';\xa4\xd5\xffgd\xe5\x98\x06i\xab\xbal\x19\xb2\xeai\xa8\x07\xca\xbe\x17U\\)\xc1\x1d\xfc\x03\xb9\xc7\x06'
>>> aes_cbc.decrypt(ciphertext, key)
b'Hello world!'
>>> key = b'0' + key[1:]
>>> aes_cbc.decrypt(ciphertext, key)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/tmp/aes_cbc.py", line 26, in decrypt
    return unpad(descipher.decrypt(ciphertext), AES.block_size)
  File "/home/dtxdf/.local/lib/python3.8/site-packages/Crypto/Util/Padding.py", line 93, in unpad
    raise ValueError("PKCS#7 padding is incorrect.")
ValueError: PKCS#7 padding is incorrect.
>>>

#!/usr/bin/env python

from Crypto.Cipher import AES

def _convert2bytes(s):
	return s.encode() if not (isinstance(s, bytes)) else s

def encrypt(plaintext, password):
	password = _convert2bytes(password)
	plaintext = _convert2bytes(plaintext)

	cipher = AES.new(password, AES.MODE_CBC)
	ciphertext = cipher.encrypt(plaintext)

	return cipher.iv + ciphertext

def decrypt(ciphertext, password):
	password = _convert2bytes(password)

	iv = ciphertext[:16]
	ciphertext = ciphertext[16:]
	
	descipher = AES.new(password, AES.MODE_CBC, iv=iv)

	return descipher.decrypt(ciphertext)

>>> import aes_cbc
>>> plaintext = "Buen día mundo.".encode()
>>> len(plaintext)
16
>>> key = ("1"*32).encode()
>>> ciphertext = aes_cbc.encrypt(plaintext, key)
>>> ciphertext
b'\xbb\xf4\x016\xd4\xea\xde\x9f\x92\xc7*\xb2]\xc2\xe8\xb4\xeegt\x9dy\xd9\x14\xa8\xb1\xee\x87\x93{&`\xfa'
>>> aes_cbc.decrypt(ciphertext, key)
b'Buen d\xc3\xada mundo.'
>>> key = b'0' + key[1:]
>>> decrypted = aes_cbc.decrypt(ciphertext, key)
>>> decrypted
b'\x05\xa0?IL!\x8dW\xf1<\x97\x85\x7f\xe7\xa98'
>>> decrypted.decode()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xa0 in position 1: invalid start byte
>>>

crunch <min> <max> [options]

crunch 1 4 hola

crunch 1 4 hola123 -c 10

crunch 1 7 abc | python add_digit.py

#!/usr/bin/env python3

import random
import sys

while (True):
    text = sys.stdin.readline()
    
    if not (text):
        break

    index = random.randint(0, len(text))
    rnumber = random.randint(0, 9) # Mencionaste sólo un digito
    array = ' '.join(text).split()
    array.insert(index, str(rnumber))

    print(''.join(array))

crunch 1 4 abcd | python add_digit.py

shift + Print
        import -window root /tmp/screenshot.png