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This commit is contained in:
mwiegand 2021-06-20 20:32:20 +02:00
parent 0bf405d961
commit 89bc0976f7
1 changed files with 17 additions and 4 deletions
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21
libs/derive_string.py
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@ -4,6 +4,7 @@ from hashlib import sha3_256
from itertools import count
from Crypto.Cipher import ChaCha20
from math import floor, ceil
from time import sleep
def chacha_bits(input, bit_count):
zerobyte = (0).to_bytes(length=1, byteorder='big')
@ -11,23 +12,35 @@ def chacha_bits(input, bit_count):
i = 0
while True:
print('-----------------------------')
start_bit = bit_count * i
start_byte = start_bit // 8
start_padding = start_bit % 8
print('start_bit', start_bit)
print('start_byte', start_byte)
print('start_padding', start_padding)
end_bit = bit_count * i + bit_count
end_byte = end_bit // 8
end_padding = 8 - (end_bit % 8)
byte_count = end_byte - start_byte
print('end_bit', end_bit)
print('end_byte', end_byte)
print('end_padding', end_padding)
byte_count = (end_byte - start_byte) + 1
print('byte_count', byte_count)
cipher.seek(start_byte)
ciphertext = cipher.encrypt(zerobyte*byte_count)
print('ciphertext', bin(int.from_bytes(ciphertext, byteorder='big')))
shifted_ciphertext = int.from_bytes(ciphertext, byteorder='big') >> end_padding
print('shifted_ciphertext', bin(shifted_ciphertext))
bit_mask = int('1'*bit_count, 2)
print('bit_mask', bin(bit_mask))
masked_ciphertext = shifted_ciphertext & bit_mask
print('masked_ciphertext', bin(masked_ciphertext))
yield masked_ciphertext
i += 1
@ -46,5 +59,5 @@ def derive_string(input, length, choices):
return ''.join(next(get_character) for i in range(length))
print(
derive_string(b'12345', length=100, choices='abcde12345')
derive_string(b'12345', length=100, choices='abcdefghijklmnopqrstuvwxyz0123456789')
)