05.JS常见加密方式与Python改写

1.对称加密（加密解密密钥相同）AES

from Crypto.Cipher import AES import base64 class USE_AES: """ AES 除了MODE_SIV模式key长度为：32, 48, or 64, 其余key长度为16, 24 or 32 详细见AES内部文档 CBC模式传入iv参数 本例使用常用的ECB模式 """ def __init__(self, key): if len(key) > 32: key = key[:32] self.key = self.to_16(key) def to_16(self, key): """ 转为16倍数的bytes数据 :param key: :return: """ key = bytes(key, encoding="utf8") while len(key) % 16 != 0: key += b'\0' return key # 返回bytes def aes(self): return AES.new(self.key, AES.MODE_ECB) # 初始化加密器 def encrypt(self, text): aes = self.aes() return str(base64.encodebytes(aes.encrypt(self.to_16(text))),encoding='utf8').replace('\n', '') # 加密 def decodebytes(self, text): aes = self.aes() return str(aes.decrypt(base64.decodebytes(bytes(text, encoding='utf8'))).rstrip(b'\0').decode("utf8")) # 解密 if __name__ == '__main__': aes_test = USE_AES("123") a = aes_test.encrypt("测试") b = aes_test.decodebytes(a) print('加密后：{}'.format(a),'解密后：{}'.format(b)) 

2.对称加密（加密解密密钥相同）：DES 和 DES3

from pyDes import des, CBC, PAD_PKCS5 from Crypto.Cipher import DES3 class USE_DES: """ des(key,[mode], [IV], [pad], [pad mode]) key:必须正好8字节 mode（模式）：ECB、CBC iv:CBC模式中必须提供长8字节 pad:填充字符 padmode:加密填充模式PAD_NORMAL or PAD_PKCS5 """ def __init__(self, key, iv): if not isinstance(key, bytes): key = bytes(key, encoding="utf8") if not isinstance(iv, bytes): iv = bytes(iv, encoding="utf8") self.key = key self.iv = iv def encrypt(self, text): """ DES 加密 :param text: 原始字符串 :return: 加密后字符串，bytes """ if not isinstance(text, bytes): text = bytes(text, "utf-8") secret_key = self.key iv = self.iv k = des(secret_key, CBC, iv, pad=None, padmode=PAD_PKCS5) en = k.encrypt(text, padmode=PAD_PKCS5) return en def descrypt(self, text): """ DES 解密 :param text: 加密后的字符串，bytes :return: 解密后的字符串 """ secret_key = self.key iv = self.iv k = des(secret_key, CBC, iv, pad=None, padmode=PAD_PKCS5) de = k.decrypt(text, padmode=PAD_PKCS5) return de.decode() class USE_DES3: """ new(key, mode, *args, kwargs) key:必须8bytes倍数介于16-24 mode： iv:初始化向量适用于MODE_CBC、MODE_CFB、MODE_OFB、MODE_OPENPGP，4种模式 ``MODE_CBC``, ``MODE_CFB``, and ``MODE_OFB``长度为8bytes MODE_OPENPGP加密时8bytes解密时10bytes 未提供默认随机生成 nonce：仅在 ``MODE_EAX`` and ``MODE_CTR``模式中使用 ``MODE_EAX``建议16bytes ``MODE_CTR``建议[0, 7]长度 未提供则随机生成 segment_size：分段大小，仅在 ``MODE_CFB``模式中使用，长度为8倍数，未指定则默认为8 mac_len：适用``MODE_EAX``模式，身份验证标记的长度（字节），它不能超过8（默认值） initial_value：适用MODE_CTR，计数器的初始值计数器块。默认为0。 """ def __init__(self, key): self.key = key self.mode = DES3.MODE_ECB def encrypt(self, text): """ 传入明文 :param text:bytes类型，长度是KEY的倍数 :return: """ if not isinstance(text, bytes): text = bytes(text, 'utf-8') x = len(text) % 8 text = text+b'\0'*x cryptor = DES3.new(self.key, self.mode) ciphertext = cryptor.encrypt(text) return ciphertext def decrypt(self, text): cryptor = DES3.new(self.key, self.mode) plain_text = cryptor.decrypt(text) st = str(plain_text.decode("utf-8")).rstrip('\0') return st if __name__ == '__main__': des_test = USE_DES(b"", b"") a = des_test.encrypt("测试加密") b = des_test.descrypt(a) print('加密后：{}'.format(a), '解密后：{}'.format(b)) des3_test = USE_DES3(b"qazxswe") a = des3_test.encrypt("测试加密") b = des3_test.decrypt(a) print('加密后：{}'.format(a), '解密后：{}'.format(b)) 

3.非对称加密（分公钥私钥）：RSA

import rsa class USE_RSA: """ 生成密钥可保存.pem格式文件 1024位的证书，加密时最大支持117个字节，解密时为128； 2048位的证书，加密时最大支持245个字节，解密时为256。 加密大文件时需要先用AES或者DES加密，再用RSA加密密钥，详细见文档 文档:https://stuvel.eu/files/python-rsa-doc/usage.html#generating-keys """ def __init__(self, number=1024): """ :param number: 公钥、私钥 """ self.pubkey, self.privkey = rsa.newkeys(number) def rsaEncrypt(self, text): """ :param test: str :return: bytes """ content = text.encode('utf-8') crypto = rsa.encrypt(content, self.pubkey) return crypto def rsaDecrypt(self, text): """ :param text:bytes :return: str """ content = rsa.decrypt(text, self.privkey) con = content.decode('utf-8') return con def savePem(self, path_name, text): """ :param path_name: 保存路径 :param text: str :return:bytes """ if "PEM" in path_name.upper(): path_name = path_name[:-4] with open('{}.pem'.format(path_name), 'bw') as f: f.write(text.save_pkcs1()) def readPem(self, path_name, key_type): """ :param path_name: 密钥文件 :param key_type:类型 :return: """ if 'pubkey' in key_type: self.pubkey = rsa.PublicKey.load_pkcs1(path_name) else: self.privkey = rsa.PublicKey.load_pkcs1(path_name) return True def sign(self, message, priv_key=None, hash_method='SHA-1'): """ 生成明文的哈希签名以便还原后对照 :param message: str :param priv_key: :param hash_method: 哈希的模式 :return: """ if None == priv_key: priv_key = self.privkey return rsa.sign(message.encode(), priv_key, hash_method) def checkSign(self, mess, result, pubkey=None): """ 验证签名：传入解密后明文、签名、公钥，验证成功返回哈希方法，失败则报错 :param mess: str :param result: bytes :param pubkey: :return: str """ if None == pubkey: pubkey = self.privkey try: result = rsa.verify(mess, result, pubkey) return result except: return False if __name__ == '__main__': rsa_test = USE_RSA() a = rsa_test.rsaEncrypt("测试加密") b = rsa_test.rsaDecrypt(a) print('加密后：{}'.format(a), '解密后：{}'.format(b)) 

4.信息摘要算法/签名算法：MD5、HMAC、SHA

import hashlib import hmac def USE_MD5(test): if not isinstance(test, bytes): test = bytes(test, 'utf-8') m = hashlib.md5() m.update(test) return m.hexdigest() def USE_HMAC(key, text): if not isinstance(key, bytes): key = bytes(key, 'utf-8') if not isinstance(text, bytes): text = bytes(text, 'utf-8') h = hmac.new(key, text, digestmod='MD5') return h.hexdigest() def USE_SHA(text): if not isinstance(text, bytes): text = bytes(text, 'utf-8') sha = hashlib.sha1(text) encrypts = sha.hexdigest() return encrypts if __name__ == '__main__': md5_test = USE_MD5("测试签名") hmac_test = USE_HMAC("", "测试") sha_test = USE_SHA("测试加密") print(md5_test,hmac_test,sha_test)