miscreant_aes_siv_authenticated_encryption_quickstart.py

1import miscreant
2
3# Create a new AES-SIV instance with a 256-bit (32-byte) key
4# Note: Key must be 32, 48, or 64 bytes for AES-SIV
5key = b"\x00" * 32
6siv = miscreant.AES_SIV(key)
7
8# The message to be encrypted
9plaintext = b"Hello, world!"
10
11# Associated Data (optional): can be used to bind the ciphertext to a specific context
12associated_data = [b"header data"]
13
14# Encrypt the plaintext. In AES-SIV, the IV is synthesized from the 
15# plaintext and associated data, making it a deterministic encryption scheme.
16ciphertext = siv.seal(plaintext, associated_data)
17
18# Decrypt and verify the ciphertext
19decrypted_plaintext = siv.open(ciphertext, associated_data)
20
21print(f"Plaintext: {plaintext}")
22print(f"Ciphertext: {ciphertext.hex()}")
23print(f"Decrypted: {decrypted_plaintext}")