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fix: Blowfish - ignore IV length in ECB mode

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Fixes https://github.com/gchq/CyberChef/issues/1895.
This commit is contained in:
Francisco Pombal 2024-09-15 22:18:49 +01:00
parent d635cca210
commit 1fce8e5112
3 changed files with 21 additions and 9 deletions
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20
tests/operations/tests/Crypt.mjs
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@ -1579,19 +1579,31 @@ DES uses a key length of 8 bytes (64 bits).`,
from Crypto.Cipher import Blowfish
import binascii
input_data = b"The quick brown fox jumps over the lazy dog."
# Blowfish cipher parameters - key, mode, iv, segment_size, nonce
key = binascii.unhexlify("0011223344556677")
iv = binascii.unhexlify("0000000000000000")
mode = Blowfish.MODE_CBC
kwargs = {}
iv = binascii.unhexlify("ffeeddccbbaa9988")
if mode in [Blowfish.MODE_CBC, Blowfish.MODE_CFB, Blowfish.MODE_OFB]:
kwargs = {"iv": iv}
if mode == Blowfish.MODE_CFB:
kwargs["segment_size"] = 64
if mode == Blowfish.MODE_CTR:
nonce = binascii.unhexlify("0000000000000000")
nonce = nonce[:7]
kwargs["nonce"] = nonce
cipher = Blowfish.new(key, mode, **kwargs)
# Input data and padding
input_data = b"The quick brown fox jumps over the lazy dog."
if mode == Blowfish.MODE_ECB or mode == Blowfish.MODE_CBC:
padding_len = 8-(len(input_data) & 7)
for i in range(padding_len):
input_data += bytes([padding_len])
cipher = Blowfish.new(key, mode) # set iv, nonce, segment_size etc. here
# Encrypted text
cipher_text = cipher.encrypt(input_data)
cipher_text = binascii.hexlify(cipher_text).decode("UTF-8")
print("Encrypted: {}".format(cipher_text))