纯python实现aes加解密算法

纯Python实现AES（高级加密标准）加解密算法通常会依赖于第三方库，如`pycryptodome`或`cryptography`。以下是使用`pycryptodome`库的一个简单示例：

首先，确保安装了`pycryptodome`，可以使用pip进行安装：

pip install pycryptodome

然后，你可以通过以下代码来实现AES的加解密：

from Crypto.Cipher import AES
from Crypto.Util.Padding import pad, unpad
from base64 import b64encode, b64decode

def aes_encrypt(plaintext, key):
    cipher = AES.new(key.encode('utf-8'), AES.MODE_CBC)
    ciphertext = cipher.encrypt(pad(plaintext.encode('utf-8'), AES.block_size))
    iv = cipher.iv
    return b64encode(iv + ciphertext)

def aes_decrypt(ciphertext, key):
    ciphertext = b64decode(ciphertext)
    iv = ciphertext[:16]
    cipher = AES.new(key.encode('utf-8'), AES.MODE_CBC, iv=iv)
    plaintext = unpad(cipher.decrypt(ciphertext[16:]), AES.block_size)
    return plaintext.decode('utf-8')

# 示例
key = 'your_secret_key_1234567890'
plaintext = 'Hello, world!'
encrypted_text = aes_encrypt(plaintext, key)
decrypted_text = aes_decrypt(encrypted_text, key)

print(f"Encrypted text: {encrypted_text}")
print(f"Decrypted text: {decrypted_text}")