python3 对称加密算法AES、DES3

python3.6此库安装方式，需要pip3 install pycryptodome。

如有site-packages中存在crypto、pycrypto，在pip之前，需要pip3 uninstall crypto、pip3 uninstall pycrypto，否则无法安装成功。

C:\WINDOWS\system32>pip3 install pycryptodome
Collecting pycryptodome
  Downloading https://files.pythonhosted.org/packages/0f/5d/a429a53eacae3e13143248c3868c76985bcd0d75858bd4c25b574e51bd4d/pycryptodome-3.6.3-cp36-cp36m-win_amd64.whl (7.9MB)
    100% |████████████████████████████████| 7.9MB 111kB/s
Installing collected packages: pycryptodome
Successfully installed pycryptodome-3.6.3

AES：

import Crypto.Cipher.AES
import Crypto.Random
import base64
import binascii

def auto_fill(x):
    if len(x) <= 32:
        while len(x) not in [16, 24, 32]:
            x += " "
        return x.encode()
    else:
        raise "密钥长度不能大于32位！"

key = "asd"
content = "abcdefg1234567"
x = Crypto.Cipher.AES.new(auto_fill(key), Crypto.Cipher.AES.MODE_ECB)
a = base64.encodebytes(x.encrypt(auto_fill(content)))
b = x.decrypt(base64.decodebytes(a))
print(a)
print(b)
a = binascii.b2a_base64(x.encrypt(auto_fill(content)))
b = x.decrypt(binascii.a2b_base64(a))
print(a)
print(b)

key = "dsa"
iv = Crypto.Random.new().read(16)   # 向量，必须为16字节
content = "1234567abcdefg"
y = Crypto.Cipher.AES.new(auto_fill(key), Crypto.Cipher.AES.MODE_CBC, iv)
c = binascii.b2a_base64(y.encrypt(auto_fill(content)))
z = Crypto.Cipher.AES.new(auto_fill(key), Crypto.Cipher.AES.MODE_CBC, iv)
d = z.decrypt(binascii.a2b_base64(c))
print(c)
print(d)

运行结果：

b'jr/EIUp32kLHc3ypZZ1cyg==\n'
b'abcdefg1234567  '
b'jr/EIUp32kLHc3ypZZ1cyg==\n'
b'abcdefg1234567  '
b'j+Ul9KQd0HnuiHW3z9tD7A==\n'
b'1234567abcdefg  '

DES3：

import Crypto.Cipher.DES3
import base64
import binascii

def auto_fill(x):
    if len(x) > 24:
        raise "密钥长度不能大于等于24位！"
    else:
        while len(x) < 16:
            x += " "
        return x.encode()

key = "asd"
content = "abcdefg1234567"
x = Crypto.Cipher.DES3.new(auto_fill(key), Crypto.Cipher.DES3.MODE_ECB)
a = base64.encodebytes(x.encrypt(auto_fill(content)))
print(a)
b = x.decrypt(base64.decodebytes(a))
print(b)
a = binascii.b2a_base64(x.encrypt(auto_fill(content)))
b = x.decrypt(binascii.a2b_base64(a))
print(a)
print(b)

运行结果：

b'/ee3NFKeNqEk/qMNd1mjog==\n'
b'abcdefg1234567  '
b'/ee3NFKeNqEk/qMNd1mjog==\n'
b'abcdefg1234567  '