基于AES加密算法的文件加解密示例与技术解答

AES（高级加密标准）是一种广泛应用的对称加密算法，本示例展示了如何使用AES加密算法对文件进行加密和解密操作，并提供了相关的技术解答。

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

def encrypt_file(input_file, output_file, key):
    cipher = AES.new(key, AES.MODE_EAX)
    with open(input_file, 'rb') as file:
        plaintext = file.read()
        ciphertext, tag = cipher.encrypt_and_digest(plaintext)
    with open(output_file, 'wb') as file:
        [file.write(x) for x in (cipher.nonce, tag, ciphertext)]

def decrypt_file(input_file, output_file, key):
    with open(input_file, 'rb') as file:
        nonce, tag, ciphertext = [file.read(x) for x in (16, 16, -1)]
    cipher = AES.new(key, AES.MODE_EAX, nonce=nonce)
    decrypted = cipher.decrypt_and_verify(ciphertext, tag)
    with open(output_file, 'wb') as file:
        file.write(decrypted)

# 使用示例
key = get_random_bytes(16)  # 128-bit key
encrypt_file('plain.txt', 'encrypted.bin', key)
decrypt_file('encrypted.bin', 'decrypted.txt', key)

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