Day 30 30.2 非对称加密RSA

非对称加密(RSA)

• 非对称加密.
• 加密和解密的秘钥不是同一个秘钥.
  • 这里需要两把钥匙. 一个公钥, 一个私钥.
    • 公钥发送给客户端. 发送端用公钥对数据进行加密. 再发送给接收端,
    • 接收端使用私钥来对数据解密.
    • 由于私钥只存放在接受端这边. 所以即使数据被截获了. 也是无法进行解密的.

公钥和私钥

常见的非对称加密算法: RSA, DSA等等, 我们就介绍一个. RSA加密, 也是最常见的一种加密方案

【一】创建公钥和私钥

from Crypto.PublicKey import RSA

# 生成秘钥
rsakey = RSA.generate(1024)
with open("rsa.public.pem", mode="wb") as f:
    f.write(rsakey.publickey().exportKey())

with open("rsa.private.pem", mode="wb") as f:
    f.write(rsakey.exportKey())

【二】加密

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


# 加密
data = "我喜欢你"
with open("rsa.public.pem", mode="r") as f:
    pk = f.read()
    rsa_pk = RSA.importKey(pk)
    rsa = PKCS1_v1_5.new(rsa_pk)

    result = rsa.encrypt(data.encode("utf-8"))
    # 处理成b64方便传输
    b64_result = base64.b64encode(result).decode("utf-8")
    print(b64_result)

【三】解密

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

data = "BkiKG8jzVGzbWOl4m8NXJEYglgtxhOB05MGmap8JSP97GzoewPBmDTs7c5iACUof3k/uJf0H88GygajVgBvkcbckJp7oO+Qj6VSUQYTOHhKN/VG2a8v+WzL34EO/S7BYoj2oOxIDAr8wDLxYxjBeXq/Be6Q1yBbnZcKaMkifhP8="
# 解密
with open("rsa.private.pem", mode="r") as f:
    prikey = f.read()
    rsa_pk = RSA.importKey(prikey)
    rsa = PKCS1_v1_5.new(rsa_pk)
    result = rsa.decrypt(base64.b64decode(data), None)
    print("rsa解密数据:::", result.decode("utf-8