python encrypt 實現AES加密

AES加密方式有五種 ： ECB, CBC, CTR, CFB, OFB

從安全性角度推薦cbc算法

windows 下安裝 ： pip install pycryptodome

linux 下安裝 ： pip install pycrypto

cbc加密需要一個十六位的key 和一個十六位的iv(偏移量)

ecb加密不需要iv

 

 

aes cbc 加密的python實現

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


# 如果text不足十六位的倍數用空格補充
def add_to_16(text):
    if len(text.encode('utf8')) % 16:
        add = 16 - (len(text.encode('utf8')) % 16)
    else:
        add = 0
    text = text + '\0' * 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)
    # 因為AES加密后的字符串不一定是ascii字符集的，輸出保存可能存在問題，所以這里轉為16進制字符串
    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('\0')


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

 

 

aes ecb加密， 沒有偏移量iv

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


# 如果text不足十六位的倍數用空格補充
def add_to_16(text):
    if len(text.encode('utf8')) % 16:
        add = 16 - (len(text.encode('utf8')) % 16)
    else:
        add = 0
    text = text + '\0' * 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)
    # 因為AES加密后的字符串不一定是ascii字符集的，輸出保存可能存在問題，所以這里轉為16進制字符串
    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('\0')


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