AES CBC PKCS7加密解密算法 Python实现

所需库

• pycryptodome

代码

from Crypto.Cipher import AES
from Crypto.Util.Padding import pad

# 16位
key = '1a1a1a1a1a1a1a1a'
# 16位
iv = '1234567890000000'

# 解密
# 参数：密文
def decrypt(ciphertext):
    
    b_text = bytes.fromhex(ciphertext)
    cipher = AES.new(key.encode('utf-8'), AES.MODE_CBC, iv.encode('utf-8'))
    try:
        plaintext = cipher.decrypt(b_text).decode('utf-8')
    except UnicodeDecodeError as e:
        print(e)
        print("key不正确")
        exit(-1)
    else:
        return plaintext


# 加密 参数：明文
def encrypt(plaintext: str):
    cipher = AES.new(key.encode('utf-8'), AES.MODE_CBC, iv.encode('utf-8'))
    pad_pkcs7 = pad(plaintext.encode('utf-8'), AES.block_size, style="pkcs7")
    ciphertext = bytes.hex(cipher.encrypt(pad_pkcs7))
    return ciphertext


if __name__ == '__main__':
    plaintext_str = "this is a test str."
    en_str = encrypt(plaintext_str)
    de_str = decrypt(en_str)
    # 加密后的密文
    print(en_str)
    # 解密后的明文
    print(de_str.encode('utf-8'))