python encrypt 实现AES加密

Posted 2021-03-08 眼镜儿

AES加密方式有五种 ： ECB, CBC, CTR, CFB, OFB

从安全性角度推荐cbc算法

windows 下安装 ： pip install pycryptodome

linux 下安装 ： pip install pycrypto

cbc加密需要一个十六位的key 和一个十六位的iv(偏移量)

ecb加密不需要iv

 

 

aes cbc 加密的python实现

from Crypto.Cipher import AES
from binascii import b2a_hex, a2b_hex


# 如果text不足十六位的倍数用空格补充
def add_to_16(text):
    if len(text.encode(‘utf8‘)) % 16:
        add = 16 - (len(text.encode(‘utf8‘)) % 16)
    else:
        add = 0
    text = text + ‘‘ * add
    return text


# 加密
def encrypt(text):
    key = ‘9999999999999999‘.encode(‘utf8‘)
    mode = AES.MODE_CBC
    iv = b‘qqqqqqqqqqqqqqqq‘
    text = add_to_16(text)
    cryptos = AES.new(key, mode, iv)
    cipher_text = cryptos.encrypt(text)
    # 因为AES加密后的字符串不一定是ascii字符集的，输出保存可能存在问题，所以这里转为16进制字符串
    return b2a_hex(cipher_text)


# 解密后去掉空格
def decrypt(text):
    key = ‘9999999999999999‘.encode(‘utf8‘)
    mode = AES.MODE_CBC
    iv = b‘qqqqqqqqqqqqqqqq‘
    cryptos = AES.new(key, mode, iv)
    plain_text = cryptos.decrypt(a2b_hex(text))
    return bytes.decode(plain_text).rstrip(‘‘)


if __name__ == ‘__main__‘:
    a = encrypt(‘hello‘)
    b = decrypt(a)
    print(‘加密‘, a)
    print(‘解密‘, b)

 

 

aes ecb加密， 没有偏移量iv

from Crypto.Cipher import AES
from binascii import b2a_hex, a2b_hex


# 如果text不足十六位的倍数用空格补充
def add_to_16(text):
    if len(text.encode(‘utf8‘)) % 16:
        add = 16 - (len(text.encode(‘utf8‘)) % 16)
    else:
        add = 0
    text = text + ‘‘ * add
    return text


# 加密
def encrypt(text):
    key = ‘9999999999999999‘.encode(‘utf8‘)
    mode = AES.MODE_ECB
    text = add_to_16(text)
    cryptos = AES.new(key, mode)
    cipher_text = cryptos.encrypt(text)
    # 因为AES加密后的字符串不一定是ascii字符集的，输出保存可能存在问题，所以这里转为16进制字符串
    return b2a_hex(cipher_text)


# 解密后去掉空格
def decrypt(text):
    key = ‘9999999999999999‘.encode(‘utf8‘)
    mode = AES.MODE_ECB
    cryptos = AES.new(key, mode)
    plain_text = cryptos.decrypt(a2b_hex(text))
    return bytes.decode(plain_text).rstrip(‘‘)


if __name__ == ‘__main__‘:
    a = encrypt(‘hello‘)
    b = decrypt(a)
    print(‘加密‘, a)
    print(‘解密‘, b)