libs/derive_string.py

@@ -1,50 +0,0 @@
-#!/usr/bin/env python
-
-from hashlib import sha3_256
-from itertools import count
-from Crypto.Cipher import ChaCha20
-from math import floor, ceil
-
-def chacha_bits(input, bit_count):
-    zerobyte = (0).to_bytes(length=1, byteorder='big')
-    cipher = ChaCha20.new(key=sha3_256(input).digest(), nonce=zerobyte*8)
-    i = 0
-
-    while True:
-        start_bit = bit_count * i
-        start_byte = start_bit // 8
-        start_padding = start_bit % 8
-
-        end_bit = bit_count * i + bit_count
-        end_byte = end_bit // 8
-        end_padding = 8 - (end_bit % 8)
-
-        byte_count = end_byte - start_byte
-
-        cipher.seek(start_byte)
-        ciphertext = cipher.encrypt(zerobyte*byte_count)
-        shifted_ciphertext = int.from_bytes(ciphertext, byteorder='big') >> end_padding
-        
-        bit_mask = int('1'*bit_count, 2)
-        masked_ciphertext = shifted_ciphertext & bit_mask
-        
-        yield masked_ciphertext
-        i += 1
-
-
-def chacha_chracter(input, choices):
-    get_bits = chacha_bits(input, len(choices).bit_length())
-    
-    while True:
-        choice = next(get_bits)
-        if choice < len(choices):
-            yield choices[choice]
-
-
-def derive_string(input, length, choices):
-    get_character = chacha_chracter(input, choices)
-    return ''.join(next(get_character) for i in range(length))
-
-print(
-    derive_string(b'12345', length=100, choices='abcde12345')
-)

requirements.txt

@@ -1,3 +1,2 @@
 bundlewrap>=4.8.0
-pycryptodome
 PyNaCl