aes加密python实现

AES (Advanced Encryption Standard) 是一种常用的对称加密算法，Python 中可以使用 `cryptography` 库来轻松实现 AES 加密。以下是简单的步骤：

from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes
from cryptography.hazmat.backends import default_backend
from cryptography.hazmat.primitives import padding

# 导入密钥、初始化向量（IV）
key = b'your_secret_key_32_bytes'  # 通常32字节（256位）
iv = b'your_initialization_vector_16_bytes'  # 通常16字节

def encrypt(plaintext):
    backend = default_backend()
    cipher = Cipher(algorithms.AES(key), modes.CBC(iv), backend=backend)
    encryptor = cipher.encryptor()

    padder = padding.PKCS7(cipher.block_size).padder()
    padded_plaintext = padder.update(plaintext) + padder.finalize()

    ciphertext = encryptor.update(padded_plaintext) + encryptor.finalize()
    return ciphertext

def decrypt(ciphertext):
    backend = default_backend()
    decipher = Cipher(algorithms.AES(key), modes.CBC(iv), backend=backend).decryptor()

    unpadder = padding.PKCS7(cipher.block_size).unpadder()
    decrypted_ciphertext = decipher.update(ciphertext) + decipher.finalize()

    plaintext = unpadder.update(decrypted_ciphertext) + unpadder.finalize()
    return plaintext.decode('utf-8')  # 如果你的数据是字符串

# 示例
plaintext = "Hello, world!"
ciphertext = encrypt(plaintext.encode('utf-8'))
decrypted_text = decrypt(ciphertext)

print(f"原始文本: {plaintext}")
print(f"加密后的文本: {ciphertext.hex()}")
print(f"解密后的文本: {decrypted_text}")