安装第三方包：pip install pycryptodome

from Crypto.PublicKey import RSA import Crypto.Signature.PKCS1_v1_5 as sign_PKCS1_v1_5 #签名/验签 from Crypto.Cipher import PKCS1_v1_5 #用于加密 from Crypto import Random from Crypto import Hash     # x = RSA.generate(2048) # # y = RSA.generate(2048, Random.new().read) 也可以使用伪随机数辅助生成 # s_key = x.export_key() #私钥 # g_key = x.publickey().export_key() #公钥 # print(s_key,'\n111\n',g_key)       #写入文件--1 # with open("s.pem", "wb") as x: # x.write(s_key) # with open("g.pem", "wb") as x: # x.write(g_key)     #从文件中导入密钥 -- 公钥是通过私钥生成的 (公钥不会变 -- 只知道私钥的情况)-2 with open('s.pem','rb')as x:     s_key = RSA.importKey(x.read()) # g_key = s_key.publickey().export_key()  #导入公钥 with open('g.pem','rb')as x:     g_key = RSA.importKey(x.read())  s_key = s_key.export_key() g_key = g_key.export_key()  # cert = s_key.export_key("DER") #生成证书 -- 它与私钥唯一对应 # print(cert)     #实现RSA 非对称加解密 my_private_key = s_key  # 私钥 my_public_key = g_key  # 公钥     #使用公钥 - 私钥加解信息   def encrypt_with_rsa(plain_text):       #先公钥加密     cipher_pub_obj = PKCS1_v1_5.new(RSA.importKey(my_public_key))     _secret_byte_obj = cipher_pub_obj.encrypt(plain_text.encode())
 
    return _secret_byte_obj
 
def decrypt_with_rsa(_secret_byte_obj):
 
    #后私钥解密
    cipher_pri_obj = PKCS1_v1_5.new(RSA.importKey(my_private_key))
    _byte_obj = cipher_pri_obj.decrypt(_secret_byte_obj, Random.new().read)
    plain_text = _byte_obj.decode()
 
    return plain_text
 
def executer_without_signature():
 
    #加解密验证
    text = "info"
    assert text == decrypt_with_rsa(encrypt_with_rsa(text))
    print("rsa test success！")
 
 
 
# 使用私钥 - 公钥对信息进行签名，验签 

def to_sign(plain_text,private_key):
    #签名
    signer_pri_obj = sign_PKCS1_v1_5.new(RSA.importKey(key))
    rand_hash = Hash.SHA256.new()
    rand_hash.update(plain_text.encode())
    signature = signer_pri_obj.sign(rand_hash)
 
    return signature
 
def to_verify(signature, plain_text,public_key):
    #验签
    verifier = sign_PKCS1_v1_5.new(RSA.importKey(key))
    _rand_hash = Hash.SHA256.new()
    _rand_hash.update(plain_text.encode())
    verify = verifier.verify(_rand_hash, signature)
    print('verify',verify)
    return verify #true / false
 
def executer_with_signature():
    #签名/验签
    text = "info"
    assert to_verify(to_sign(text,my_private_key), text,my_public_key)
    print("rsa Signature verified!")
 
if __name__ == '__main__' :
 
    executer_without_signature() # 只加密不签名
    executer_with_signature()  #只签名不加密