Python实现RSA加密解密加签验签

提前准备好公钥和私钥文件.
公钥和私钥文件生成见文章Python生成RSA公钥public.pem私钥private.pem

利用Crypto模块实现

python3需要安装pycryptodome
pip install pycryptodome

注意: windows环境下可能会有找不到Crypto的情况,这里有个小BUG,windows环境下安装完pycryptodome后在你python的根目录下如:
Python\Python36\Lib\site-packages
里面有一个文件夹叫做crypto,将首字母小写c改成大写C即可解决.

实现代码:

from Crypto.PublicKey import RSA
from Crypto.Cipher import PKCS1_v1_5 as Cipher_pkcs1_v1_5
from Crypto.Signature import PKCS1_v1_5 as Signature_pkcs1_v1_5
from Crypto.Hash import SHA
import base64


class RSAsys:
    public_pem = './public.pem'  # 公钥文件路径
    private_pem = './private.pem'  # 私钥文件路径

    # 加密
    @classmethod
    def rsa_encrypt(cls, message):
        rsakey = RSA.importKey(open(cls.public_pem).read())
        cipher = Cipher_pkcs1_v1_5.new(rsakey)  # 创建用于执行pkcs1_v1_5加密或解密的密码
        cipher_text = base64.b64encode(cipher.encrypt(message.encode('utf-8')))
        return cipher_text.decode('utf-8')

    # 解密
    @classmethod
    def rsa_decrypt(cls, cipher_text):
        encrypt_text = cipher_text.encode('utf-8')
        rsakey = RSA.importKey(open(cls.private_pem).read())
        cipher = Cipher_pkcs1_v1_5.new(rsakey)  # 创建用于执行pkcs1_v1_5加密或解密的密码
        text = cipher.decrypt(base64.b64decode(encrypt_text), "解密失败")
        return text.decode('utf-8')

    # 加签
    @classmethod
    def sign_add(cls, message):
        rsakey = RSA.importKey(open(cls.private_pem).read())
        signer = Signature_pkcs1_v1_5.new(rsakey)
        digest = SHA.new()
        digest.update(message.encode("utf-8"))
        sign = signer.sign(digest)
        signature = base64.b64encode(sign)
        return signature.decode('utf-8')

    # 验签
    @classmethod
    def sign_verify(cls, message_verify, signature):
        rsakey = RSA.importKey(open(cls.public_pem).read())
        verifier = Signature_pkcs1_v1_5.new(rsakey)
        hsmsg = SHA.new()
        hsmsg.update(message_verify.encode("utf-8"))
        try:
            verifier.verify(hsmsg, base64.b64decode(signature))
            return True
        except Exception as e:
            return False


if __name__ == '__main__':
    message = 'helloworld'
    cipher = RSAsys.rsa_encrypt(message)
    print("加密", cipher)
    text = RSAsys.rsa_decrypt(cipher)
    print("解密", text)
    sign = RSAsys.sign_add(message)
    print("加签", sign)
    sign_ver = RSAsys.sign_verify(message, sign)
    print("验签", sign_ver)

参考文章