MadelineProto/tests/encrypt_decrypt_ige_test.py

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2015-03-15 02:55:59 +01:00
# Author: Sammy Pfeiffer
# This file tests the AES 256 IGE cipher
# working in Python 2.7 and Python 3.4 (other versions untested)
# as it's needed for the implementation of Telegram API
from crypt import ige
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# AES 256 IGE is using AES ECB internally, it implies (extract from PyCrypto.cipher.AES):
# key : byte string
# The secret key to use in the symmetric cipher.
# It must be 16 (*AES-128*), 24 (*AES-192*), or 32 (*AES-256*) bytes long.
# IV : byte string
# The initialization vector to use for encryption or decryption.
#
# It is ignored for `MODE_ECB` and `MODE_CTR`.
#
# For all other modes, it must be `block_size` bytes longs.
# message must be a multiple of 16 in size
msg_to_encrypt = "This is a secret message"
padding_needed = 16 - len(msg_to_encrypt) % 16
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msg_to_encrypt_padded = msg_to_encrypt + str(0) * padding_needed
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print("Encrypting: '" + str(msg_to_encrypt) + "'")
print("With padding: '" + str(msg_to_encrypt_padded) + "'")
# 32 bytes long key
aes_key = b'12345678901234567890123456789012'
print("With key for AES 256 ECB: '" + str(aes_key) + "'")
# Initialization Vector must be 32 bytes
aes_iv = b'01234567890123456789012345678901'
print("And initialization vector: '" + str(aes_iv) + "'")
encrypted_msg = _ige(msg_to_encrypt_padded, aes_key, aes_iv, operation="encrypt")
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print("\nEncrypted msg: '" + str(encrypted_msg) + "'")
print("In hex: " + encrypted_msg.__repr__())
decrypted_msg = _ige(encrypted_msg, aes_key, aes_iv, operation="decrypt")
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print("\nDecrypted msg: '" + str(decrypted_msg) + "'")
print("In hex: " + decrypted_msg.__repr__())
if msg_to_encrypt_padded == decrypted_msg:
print("Encrypt + Decrypt process, completed succesfully.")
# Let's test incorrect inputs
print("\n\nTesting incorrect inputs:")
# Message with length not multiple of 16
msg_not_multiple_of_16 = "6bytes"
print("Trying to encrypt: '" + msg_not_multiple_of_16 +
"' of size: " + str(len(msg_not_multiple_of_16)))
try:
encrypted_msg = _ige(msg_not_multiple_of_16, aes_key, aes_iv, operation="encrypt")
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except ValueError as ve:
print(" Correctly got ValueError: '" + str(ve) + "'")
# key not being 32 bytes
aes_key_not_32_bytes = b'0123456789'
print("Trying to use key: '" + str(aes_key_not_32_bytes) + "'")
try:
encrypted_msg = _ige(msg_to_encrypt_padded, aes_key_not_32_bytes, aes_iv, operation="encrypt")
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except ValueError as ve:
print(" Correctly got ValueError: '" + str(ve) + "'")
# iv not being 32 bytes
iv_key_not_32_bytes = b'0123456789'
print("Trying to use iv: '" + str(iv_key_not_32_bytes) + "'")
try:
encrypted_msg = _ige(msg_to_encrypt_padded, aes_key, iv_key_not_32_bytes, operation="encrypt")
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except ValueError as ve:
print(" Correctly got ValueError: '" + str(ve) + "'")