Python使用Crypto庫實現加密解密的示例詳解

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一：crypto庫安裝

pycrypto，pycryptodome是crypto第三方庫，pycrypto已經停止更新三年瞭，所以不建議安裝這個庫；pycryptodome是pycrypto的延伸版本，用法和pycrypto 是一模一樣的；所以隻需要安裝pycryptodome就可以瞭

pip install pycryptodome

二：python使用crypto

1：crypto的加密解密組件des.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-
 
from Crypto.Cipher import DES
from binascii import b2a_hex, a2b_hex
class MyDESCrypt: #自己實現的DES加密類
    def __init__(self, key = ''):
        #密鑰長度必須為64位，也就是8個字節
        if key is not '':
            self.key = key.encode('utf-8')
        else:
            self.key = '12345678'.encode('utf-8')
        self.mode = DES.MODE_CBC
    # 加密函數，如果text不足16位就用空格補足為16位，
    # 如果大於16當時不是16的倍數，那就補足為16的倍數。
    def encrypt(self,text):
        try:
            text = text.encode('utf-8')
            cryptor = DES.new(self.key, self.mode, self.key)
            # 這裡密鑰key 長度必須為16（DES-128）,
            # 24（DES-192）,或者32 （DES-256）Bytes 長度
            # 目前DES-128 足夠目前使用
            length = 16   #lenth可以設置為8的倍數
            count = len(text)
            if count < length:
                add = (length - count)
                # \0 backspace
                # text = text + ('\0' * add)
                text = text + ('\0' * add).encode('utf-8')
            elif count > length:
                add = (length - (count % length))
                # text = text + ('\0' * add)
                text = text + ('\0' * add).encode('utf-8')
            self.ciphertext = cryptor.encrypt(text)
            # 因為DES加密時候得到的字符串不一定是ascii字符集的，輸出到終端或者保存時候可能存在問題
            # 所以這裡統一把加密後的字符串轉化為16進制字符串
            return b2a_hex(self.ciphertext)
        except:
            return ""
    # 解密後，去掉補足的空格用strip() 去掉
    def decrypt(self, text):
        try:
            cryptor = DES.new(self.key, self.mode, self.key)
            plain_text = cryptor.decrypt(a2b_hex(text))
            # return plain_text.rstrip('\0')
            return bytes.decode(plain_text).rstrip('\0')
        except:
            return ""

2：crypto組件使用

from . import des
msg = "password is 961223"
key = "12345678"  #key值可傳可不傳
des1 = des.MyDESCrypt()
#加密
cipherTxt = des1.encrypt(msg)  #返回值為bytes型
print(cipherTxt)
#解密
decTxt = des1.decrypt(cipherTxt);  #返回值為str型
print(decTxt)

知識補充

下面是小編為大傢整理的一些Python利用pycrypto進行加密解密的示例，希望對大傢有所幫助

AES-ECB加解密

下面是采用 ECB並以pkcs7填充的加密與解密方法

import base64

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


def aes_encrypt(secret_key, data):
    """加密數據
    :param secret_key: 加密秘鑰
    :param data: 需要加密數據
    """
    data = bytes(data, encoding="utf-8")
    # 填充數據采用pkcs7
    data = pad(data, block_size=16, style="pkcs7")
    # 創建加密器
    cipher = AES.new(key=secret_key.encode("utf-8"), mode=AES.MODE_ECB)
    # 對數據進行加密
    encrypted_data = cipher.encrypt(data)
    # 對數據進行base64編碼
    encrypted_data = base64.b64encode(encrypted_data)
    return encrypted_data.decode()


def aes_decrypt(secret_key, data):
    """解密數據
    """
    data = base64.b64decode(data)
    cipher = AES.new(key=secret_key.encode("utf-8"), mode=AES.MODE_ECB)
    decrypt_data = cipher.decrypt(data)
    decrypt_data = unpad(decrypt_data, 16, style="pkcs7")
    return decrypt_data.decode("utf-8")


if __name__ == '__main__':
    key = "22a1d4c4263e83d7f8c33a321eb19ae7"
    data = "asdASD73j8H9k6C1asvhBOK0PXOzJM7dsqXysssW"
    print("原始數據：%s" % data)
    r = aes_encrypt(key, data)
    print("加密數據：%s" % r)
    r = aes_decrypt("22a1d4c4263e83d7f8c33a321eb19ae7", r)
    print("解密數據：%s" % r)

執行結果如下

AES-GCM加解密

import base64
import random
import string

from Crypto.Cipher import AES


def encrypt_aes_gcm(key, data, associated_data=None, nonce=None):
    """
    AES-GCM加密
    :param key: 密鑰。16, 24 or 32字符長度的字符串
    :param data: 待加密字符串
    :param associated_data: 附加數據，一般為None
    :param nonce: 隨機值，和MD5的“加鹽”有些類似，目的是防止同樣的明文塊，始終加密成同樣的密文塊
    :return:
    """
    key = key.encode('utf-8')
    data = data.encode('utf-8')
    # 假如先後端約定隨機值為16位長度的字符串
    nonce = nonce or "1234567812345678"
    nonce = nonce.encode("utf-8")

    # 生成加密器
    cipher = AES.new(key, AES.MODE_GCM, nonce=nonce)
    if associated_data is not None:
        cipher.update(associated_data.encode())

    # 加密數據
    cipher_data, auth_tag = cipher.encrypt_and_digest(data)

    # 拼接數據
    join_data = nonce + cipher_data + auth_tag      # 拼接數據為：前16位為nonce，後16位為驗簽值

    # 返回base64編碼數據
    return base64.b64encode(join_data).decode('utf-8')


def decrypt_aes_gcm(key, cipher_data, associated_data=None):
    """
    AES-GCM解密
    :param cipher_data: encrypt_aes_gcm 方法返回的數據
    :return:
    """
    key = key.encode('utf-8')

    # 進行base64解碼
    debase64_cipher_data = base64.b64decode(cipher_data)

    # 分割數據
    nonce = debase64_cipher_data[:16]
    cipher_data = debase64_cipher_data[16:-16]
    auth_tag = debase64_cipher_data[-16:]

    cipher = AES.new(key, AES.MODE_GCM, nonce=nonce)
    if associated_data is not None:
        cipher.update(associated_data.encode())

    # 解密數據
    plaintext = cipher.decrypt_and_verify(cipher_data, auth_tag)
    return plaintext.decode()


if __name__ == '__main__':
    aes_key = 'DnKRYZbvVzdhPlF10rtcxmi5Cj36AbCd'
    associated_data = "1234567812345678"
    nonce = ''.join(random.sample(string.ascii_letters + string.digits, 16))
    data = '{"lang":"zh-CN","pageNumber":1,"pageSize":10,"cycleId":"1522973936269266945"}'
    print("原始數據：" + data)

    cipher_data = encrypt_aes_gcm(aes_key, data, associated_data=associated_data, nonce=nonce)
    print("加密數據：" + cipher_data)

    de_data = decrypt_aes_gcm(aes_key, cipher_data, associated_data)
    print("解密數據：" + de_data)

執行結果如下：

使用RAS實現非對稱加解密

# -*- coding: utf-8 -*-

from Crypto import Random
from Crypto.PublicKey import RSA
from Crypto.Cipher import PKCS1_v1_5
import base64


def get_key():
    """生成公私鑰"""
    # 生成rsa算法實例
    rsa = RSA.generate(1024, Random.new().read)
    # 生成公鑰私鑰
    private_pem = rsa.exportKey()
    public_pem = rsa.publickey().exportKey()

    return {
        "public_key": public_pem.decode(),
        "private_key": private_pem.decode()
    }


def rsa_encrypt(data, public_key):
    """公鑰加密"""
    # 加載公鑰
    rsakey = RSA.importKey(public_key)
    # 生成密碼器
    cipher = PKCS1_v1_5.new(rsakey)
    # 加密數據。註意，在python3中加密的數據必須是bytes類型的數據，不能是str類型的數據
    encrypt_data = cipher.encrypt(data.encode(encoding="utf-8"))
    # # 對數據進行base64編碼
    encrypt_data = base64.b64encode(encrypt_data)
    # 公鑰每次加密的結果不一樣。原因是每次padding的數據不一樣
    return encrypt_data.decode()


def rsa_decrypt(cipher_data, private_key):
    """私鑰解密"""
    # 加載私鑰
    rsakey = RSA.importKey(private_key)
    # 生成密碼器
    cipher = PKCS1_v1_5.new(rsakey)
    # 將密文解密成明文，返回的是一個bytes類型數據，需要自己轉換成str
    decrypt_data = cipher.decrypt(base64.b64decode(cipher_data), "解密失敗")
    return decrypt_data.decode()


if __name__ == '__main__':
    # k = get_key()
    # public_key = k.get("public_key")
    # private_key = k.get("private_key")
    #
    # print(public_key)
    # print(private_key)

    public_key = """-----BEGIN PUBLIC KEY-----
MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDKF7UTc5K61xMUKrCtld0dYJf/
KjT5P+R3H8n8my8aEYqUaWQjO3CkQGsLN//5Tbs8g5Of4vAkqytoleWxSQxFGO7T
YuOQ7UtvRhKqTKvX8PvDnKX7ebKzw3zIXt1QDRbc2bJTqVAbPDdT1DNvyocQdCMC
BtPA2algMRs4Zq0qpwIDAQAB
-----END PUBLIC KEY-----
    """
    private_key = """-----BEGIN RSA PRIVATE KEY-----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-----END RSA PRIVATE KEY-----
    """

    data = "hello python!"
    cipher_data = rsa_encrypt(data, public_key)
    print(cipher_data)

    decrypt_data = rsa_decrypt(cipher_data, private_key)
    print(decrypt_data)

執行結果如下

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