blob: 1935628b7bb5c05fb01dbc556f6bd65a89e0287a [file] [log] [blame]
#!/usr/bin/env python3
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to you under the Apache License, Version 2.0 (the
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import os
import sys
sys.path.insert(0, os.path.abspath(os.path.join(os.path.dirname(__file__), '..')))
import amcl.core_utils
import amcl.aes
seed_hex = "78d0fb6705ce77dee47d03eb5b9c5d30"
if __name__ == "__main__":
seed = bytes.fromhex(seed_hex)
# seed = os.urandom(16)
rng = amcl.core_utils.create_csprng(seed)
iv = amcl.core_utils.generate_random(rng, amcl.aes.IVL)
key = amcl.core_utils.generate_random(rng, amcl.aes.KEYL)
aad = b"hello world"
plaintext1 = b'test message'
print("Encrypt message")
print(f"\tplaintext: {plaintext1.decode('utf-8')}")
print(f"\tiv: {iv.hex()}")
print(f"\tkey: {key.hex()}")
print(f"\taad: {aad.hex()}")
ciphertext, tag1 = amcl.aes.gcm_encrypt(key, iv, aad, plaintext1)
print("\nEncrypted message")
print(f"\tciphertext: {ciphertext.hex()}")
print(f"\ttag: {tag1.hex()}")
plaintext2, tag2 = amcl.aes.gcm_decrypt(key, iv, aad, ciphertext)
assert tag1 == tag2, 'tags are not equal!'
assert plaintext1 == plaintext2, 'Plaintext are not equal!'
print("\nDecrypted message")
print(f"\tplaintext: {plaintext2.decode('utf-8')}")
print(f"\ttag: {tag2.hex()}")
# Create ciphertext error
ciphertext_hex = ciphertext.hex()
new = list(ciphertext_hex)
new[0] = "a" if (new[0] != "a") else "b"
ciphertext_bad_hex = ''.join(new)
ciphertext_bad = bytes.fromhex(ciphertext_bad_hex)
plaintext3, tag3 = amcl.aes.gcm_decrypt(key, iv, aad, ciphertext_bad)
assert tag1 != tag3, 'tags are equal!'
assert plaintext1 != plaintext3, 'Plaintext not equal!'
# Create aad error
aad_hex = aad.hex()
new = list(aad_hex)
new[0] = "a" if (new[0] != "a") else "b"
aad_bad_hex = ''.join(new)
aad_bad = bytes.fromhex(aad_bad_hex)
plaintext4, tag4 = amcl.aes.gcm_decrypt(key, iv, aad_bad, ciphertext)
assert tag1 != tag4, 'tags are equal!'
assert plaintext1 == plaintext4, 'Plaintext are not equal!'
# Create iv error
iv_hex = iv.hex()
new = list(iv_hex)
new[0] = "a" if (new[0] != "a") else "b"
iv_bad_hex = ''.join(new)
iv_bad = bytes.fromhex(iv_bad_hex)
plaintext5, tag5 = amcl.aes.gcm_decrypt(key, iv_bad, aad, ciphertext)
assert tag1 != tag5, 'tags are equal!'
assert plaintext1 != plaintext5, 'Plaintext are equal!'
# Create key error
key_hex = key.hex()
new = list(key_hex)
new[0] = "a" if (new[0] != "a") else "b"
key_bad_hex = ''.join(new)
key_bad = bytes.fromhex(key_bad_hex)
plaintext6, tag6 = amcl.aes.gcm_decrypt(key_bad, iv, aad, ciphertext)
assert tag1 != tag6, 'tags are equal!'
assert plaintext1 != plaintext6, 'Plaintext are equal!'