2015-03-15 02:55:59 +01:00
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# Author: Sammy Pfeiffer
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# This file tests the AES 256 IGE cipher
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# working in Python 2.7 and Python 3.4 (other versions untested)
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# as it's needed for the implementation of Telegram API
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2015-03-15 02:02:15 +01:00
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from ige import ige
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# AES 256 IGE is using AES ECB internally, it implies (extract from PyCrypto.cipher.AES):
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# key : byte string
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# The secret key to use in the symmetric cipher.
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# It must be 16 (*AES-128*), 24 (*AES-192*), or 32 (*AES-256*) bytes long.
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# IV : byte string
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# The initialization vector to use for encryption or decryption.
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#
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# It is ignored for `MODE_ECB` and `MODE_CTR`.
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#
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# For all other modes, it must be `block_size` bytes longs.
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# message must be a multiple of 16 in size
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msg_to_encrypt = "This is a secret message"
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padding_needed = 16 - len(msg_to_encrypt) % 16
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2015-03-15 02:44:48 +01:00
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msg_to_encrypt_padded = msg_to_encrypt + str(0) * padding_needed
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2015-03-15 02:02:15 +01:00
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print("Encrypting: '" + str(msg_to_encrypt) + "'")
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print("With padding: '" + str(msg_to_encrypt_padded) + "'")
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# 32 bytes long key
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aes_key = b'12345678901234567890123456789012'
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print("With key for AES 256 ECB: '" + str(aes_key) + "'")
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# Initialization Vector must be 32 bytes
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aes_iv = b'01234567890123456789012345678901'
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print("And initialization vector: '" + str(aes_iv) + "'")
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encrypted_msg = ige(msg_to_encrypt_padded, aes_key, aes_iv, operation="encrypt")
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print("\nEncrypted msg: '" + str(encrypted_msg) + "'")
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print("In hex: " + encrypted_msg.__repr__())
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decrypted_msg = ige(encrypted_msg, aes_key, aes_iv, operation="decrypt")
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print("\nDecrypted msg: '" + str(decrypted_msg) + "'")
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print("In hex: " + decrypted_msg.__repr__())
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if msg_to_encrypt_padded == decrypted_msg:
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print("Encrypt + Decrypt process, completed succesfully.")
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# Let's test incorrect inputs
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print("\n\nTesting incorrect inputs:")
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# Message with length not multiple of 16
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msg_not_multiple_of_16 = "6bytes"
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print("Trying to encrypt: '" + msg_not_multiple_of_16 +
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"' of size: " + str(len(msg_not_multiple_of_16)))
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try:
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encrypted_msg = ige(msg_not_multiple_of_16, aes_key, aes_iv, operation="encrypt")
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except ValueError as ve:
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print(" Correctly got ValueError: '" + str(ve) + "'")
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# key not being 32 bytes
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aes_key_not_32_bytes = b'0123456789'
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print("Trying to use key: '" + str(aes_key_not_32_bytes) + "'")
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try:
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encrypted_msg = ige(msg_to_encrypt_padded, aes_key_not_32_bytes, aes_iv, operation="encrypt")
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except ValueError as ve:
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print(" Correctly got ValueError: '" + str(ve) + "'")
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# iv not being 32 bytes
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iv_key_not_32_bytes = b'0123456789'
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print("Trying to use iv: '" + str(iv_key_not_32_bytes) + "'")
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try:
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encrypted_msg = ige(msg_to_encrypt_padded, aes_key, iv_key_not_32_bytes, operation="encrypt")
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except ValueError as ve:
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print(" Correctly got ValueError: '" + str(ve) + "'")
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