Python實現Rsa非對稱加密

非對稱加密時公鑰和私鑰成對，使用公鑰加密的密碼 再用私鑰進行解密

使用場景：

密碼登錄加密：前端獲取后台給定公鑰進行加密，后端拿到密碼后再進行解密 然后將密碼md5轉換后存入數據庫。
后台密鑰具有時效性 這樣傳輸中被截取也無法仿造

import base64
import rsa

# 秘鑰的位數, 可以自定義指定, 例如: 128、256、512、1024、2048等
(pubkey, privkey) = rsa.newkeys(256)
# 生成公鑰
pub = pubkey.save_pkcs1()
with open('public.pem', 'wb') as f:
    f.write(pub)

# # 生成私鑰
pri = privkey.save_pkcs1()
with open('private.pem', 'wb') as f:
    f.write(pri)


pub_str = '''-----BEGIN RSA PUBLIC KEY-----
MCgCIQCR8RiQaYZ8AwSt/EVMVs0Y88qqWGW0pYFdCgfi8G0z1QIDAQAB
-----END RSA PUBLIC KEY-----
'''
``
priv_str = '''-----BEGIN RSA PRIVATE KEY-----
MIGqAgEAAiEAkfEYkGmGfAMErfxFTFbNGPPKqlhltKWBXQoH4vBtM9UCAwEAAQIg
WP1kdxqBkLjeb6D2OJhsqUtU9+E+KkG3+4/DHH6mJYECEgDi1MtnvlIeYE2YX2Rr
1/HiJQIQAKS1cuWHyxZ/PTFR50dj8QIRWnsDgCh83T0Q9rzmc9Y52DkCDzw0QroZ
Z6difOiRKnuS0QIRX2j3UMIeTiom54alccbRQ4Y=
-----END RSA PRIVATE KEY-----
'''

class Rsa():
    def __init__(self):
        self.pub_key = rsa.PublicKey.load_pkcs1(pub_str)
        self.priv_key = rsa.PrivateKey.load_pkcs1(priv_str)

    def encrypt(self,text):
        # rsa加密 最后把加密字符串轉為base64
        text = text.encode("utf-8")
        cryto_info = rsa.encrypt(text, self.pub_key)
        cipher_base64 = base64.b64encode(cryto_info)
        cipher_base64 = cipher_base64.decode()
        return cipher_base64
    
    def decrypt(self,text):
        # rsa解密 返回解密結果
        cryto_info = base64.b64decode(text)
        talk_real = rsa.decrypt(cryto_info, self.priv_key)
        res = talk_real.decode("utf-8")
        return res

if __name__=="__main__":
    rsaer = Rsa()
    info = rsaer.encrypt('哈哈哈哈牛逼')
    print('加密:',info)
    print('解密:',rsaer.decrypt(info))
    #加密: c1s4H392ngYbwfL7S4vJS8VuspQQrNEeKT73DqSZEQ4=
    #解密: 哈哈哈哈牛逼