aead_benchmark.py

import time
  
from cryptography.hazmat.primitives.ciphers.aead import AESGCM

# typical values for QUIC using AES-256-GCM
key = bytes(32)
nonce = bytes(12)
data = bytes(1200)
additional_data = bytes(20)

aead = AESGCM(key)

# encryption
start = time.time()
for _ in range(1000000):
    aead.encrypt(nonce, data, additional_data)
print("encryption", time.time() - start)

# decryption
encrypted = aead.encrypt(nonce, data, additional_data)
start = time.time()
for _ in range(1000000):
    aead.decrypt(nonce, encrypted, additional_data)
print("decryption", time.time() - start)