在C#中,我正在从HTTP请求中检索RSA公钥,并且它以base64编码的形式给出。
我收到了如下截图所示的未处理异常错误。
WebClient webClient = new WebClient();
string rsaPublicKeyBase64 = webClient.DownloadString("http://localhost:8000/getkey");
// rsaPublicKeyBase64 = LS0tLS1CRUdJTiBQVUJMSUMgS0VZLS0tLS0KTUlHZk1BMEdDU3FHU0liM0RRRUJBUVVBQTRHTkFEQ0JpUUtCZ1FEdDAwcXQ2Zi9UUXdMQmVsVExRdVlXb05xSQoxbmRkcFpaOGh0WWs4d0NLbmFuRFJpWkJ1NVo5NnBNT01yNi84RS9JUzB0amV4WGdsVjh0WFlKK0NKc1lDUHhoCnBDUkduUW9rYkE2MnpOODVXNEROVUNMQ0cyMXlXcndscFhjSmxLYkY2dFhxdmd3TGRQb2RwZzUwY3RrWkI4R0UKbDBLS3VOV3JHZXRad045V0NRSURBUUFCCi0tLS0tRU5EIFBVQkxJQyBLRVktLS0tLQo=
然后我解码Base64格式的RSA公钥。
byte[] rsaPublicKey = Convert.FromBase64String(rsaPublicKeyBase64);
/*
-----BEGIN PUBLIC KEY-----
MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDt00qt6f/TQwLBelTLQuYWoNqI
1nddpZZ8htYk8wCKnanDRiZBu5Z96pMOMr6/8E/IS0tjexXglV8tXYJ+CJsYCPxh
pCRGnQokbA62zN85W4DNUCLCG21yWrwlpXcJlKbF6tXqvgwLdPodpg50ctkZB8GE
l0KKuNWrGetZwN9WCQIDAQAB
-----END PUBLIC KEY-----
*/
我的下一步是将包含RSA公钥证书的byte[]
转换为RSACryptoServiceProvider
类型。我在网上找到了答案,但似乎都不适用于我。
这是我目前拥有的代码(不起作用):
string rsaPublicKeyFile = Path.Combine(Path.GetTempPath(), Guid.NewGuid().ToString());
X509Certificate2 cert = null;
try {
File.WriteAllBytes(rsaPublicKeyFile, rsaPublicKey);
cert = new X509Certificate2(rsaPublicKeyFile);
} finally {
File.Delete(rsaPublicKeyFile);
}
我收到了如下截图所示的未处理异常错误。
![Unhandled Exception Error](https://istack.dev59.com/umGP0.webp)
System.Security.Cryptography.CryptographicException: 'Cannot find the requested object.