Python code to crypt a message with AES-GCM 128 bits

encrypt_python_AES_GCM.py

from Crypto.Cipher import AES
from Crypto.Random import get_random_bytes
import base64

def encrypt_aes_gcm(plaintext, key):
    cipher = AES.new(key, AES.MODE_GCM)
    ciphertext, tag = cipher.encrypt_and_digest(plaintext)
    return ciphertext, cipher.nonce, tag

# Example usage
plaintext = 'I love medium'
key = get_random_bytes(32)  # AES key length is 16 bytes (128 bits)

# Encrypt
ciphertext, nonce, tag = encrypt_aes_gcm(plaintext.encode(), key)
print("Ciphertext:", ciphertext)
print("Nonce:", nonce)
print("Tag:", tag)

key_base64 = base64.b64encode(key).decode('utf-8')
ciphertext_base64 = base64.b64encode(ciphertext).decode('utf-8')
nonce_base64 = base64.b64encode(nonce).decode('utf-8')
tag_base64 = base64.b64encode(tag).decode('utf-8')

print(key_base64, ciphertext_base64, nonce_base64, tag_base64)