51 lines
1.5 KiB
Python
51 lines
1.5 KiB
Python
from secrets import randbelow, token_bytes
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from cryptography.hazmat.primitives.ciphers import Cipher
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from cryptography.hazmat.primitives.ciphers.algorithms import ChaCha20
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from randquik import cha
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def test_cipherstreams_fullblocks():
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"""Requests in multiple of ChaCha20 block size 64 bytes"""
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key = token_bytes(32)
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nonce = token_bytes(16)
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c0 = Cipher(ChaCha20(key, nonce), None, None).encryptor()
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c1 = cha.Cha(key, nonce)
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for i in range(2048):
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N = 64 * (1 + randbelow(2048))
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ct0 = c0.update(bytes(N))
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ct1 = c1(bytearray(N))
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assert len(ct0) == len(ct1)
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assert ct0.hex() == ct1.hex()
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def test_cipherstreams_partial_updates():
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"""Odd-sized requests that retain leftover buffers"""
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key = token_bytes(32)
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nonce = token_bytes(16)
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c0 = Cipher(ChaCha20(key, nonce), None, None).encryptor()
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c1 = cha.Cha(key, nonce)
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for i in range(2048):
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N = 1 + randbelow(2048)
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ct0 = c0.update(bytes(N))
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ct1 = c1(bytearray(N))
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assert len(ct0) == len(ct1)
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assert ct0.hex() == ct1.hex()
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def test_cipherstreams_32leftover():
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"""Test the special case where the second response comes entirely from the leftover buffer"""
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key = token_bytes(32)
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nonce = token_bytes(16)
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c0 = Cipher(ChaCha20(key, nonce), None, None).encryptor()
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c1 = cha.Cha(key, nonce)
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for N in [512 - 32, 32]:
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ct0 = c0.update(bytes(N))
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ct1 = c1(bytearray(N))
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assert len(ct0) == len(ct1)
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assert ct0.hex() == ct1.hex()
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