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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 itertools import count
from Crypto.Cipher import ChaCha20 from Crypto.Cipher import ChaCha20
from math import floor, ceil from math import floor, ceil
from time import sleep
def chacha_bits(input, bit_count): def chacha_bits(input, bit_count):
zerobyte = (0).to_bytes(length=1, byteorder='big') zerobyte = (0).to_bytes(length=1, byteorder='big')
@ -11,23 +12,35 @@ def chacha_bits(input, bit_count):
i = 0 i = 0
while True: while True:
print('-----------------------------')
start_bit = bit_count * i start_bit = bit_count * i
start_byte = start_bit // 8 start_byte = start_bit // 8
start_padding = 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_bit = bit_count * i + bit_count
end_byte = end_bit // 8 end_byte = end_bit // 8
end_padding = 8 - (end_bit % 8) end_padding = 8 - (end_bit % 8)
print('end_bit', end_bit)
byte_count = end_byte - start_byte 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) cipher.seek(start_byte)
ciphertext = cipher.encrypt(zerobyte*byte_count) 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 shifted_ciphertext = int.from_bytes(ciphertext, byteorder='big') >> end_padding
print('shifted_ciphertext', bin(shifted_ciphertext))
bit_mask = int('1'*bit_count, 2) bit_mask = int('1'*bit_count, 2)
print('bit_mask', bin(bit_mask))
masked_ciphertext = shifted_ciphertext & bit_mask masked_ciphertext = shifted_ciphertext & bit_mask
print('masked_ciphertext', bin(masked_ciphertext))
yield masked_ciphertext yield masked_ciphertext
i += 1 i += 1
@ -46,5 +59,5 @@ def derive_string(input, length, choices):
return ''.join(next(get_character) for i in range(length)) return ''.join(next(get_character) for i in range(length))
print( print(
derive_string(b'12345', length=100, choices='abcde12345') derive_string(b'12345', length=100, choices='abcdefghijklmnopqrstuvwxyz0123456789')
) )