基于AES算法的文件加密解密实例代码及技术解答

本示例演示如何使用AES算法对文件进行加密和解密，保护文件的安全性。AES是一种广泛应用的对称加密算法，其高度的安全性使其成为保护敏感信息的理想选择。该示例使用Python语言实现。

from Crypto.Cipher import AES
from Crypto.Util.Padding import pad, unpad
from Crypto.Random import get_random_bytes

# 加密函数
def encrypt_file(key, file_path, output_path):
    cipher = AES.new(key, AES.MODE_CBC)
    with open(file_path, 'rb') as file:
        plaintext = file.read()
    ciphertext = cipher.encrypt(pad(plaintext, AES.block_size))
    with open(output_path, 'wb') as file:
        file.write(cipher.iv)
        file.write(ciphertext)

# 解密函数
def decrypt_file(key, file_path, output_path):
    with open(file_path, 'rb') as file:
        iv = file.read(16)
        ciphertext = file.read()
    cipher = AES.new(key, AES.MODE_CBC, iv)
    decrypted_data = unpad(cipher.decrypt(ciphertext), AES.block_size)
    with open(output_path, 'wb') as file:
        file.write(decrypted_data)

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

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