如何在wp8中用C＃签署数据

Question

我正在开发wp8应用程序。我在第一次登录请求时向服务器发送公钥。在响应服务器发送令牌（简单的base64字符串，大约1200-1300个字符），我需要使用私钥签名并在下一个请求中发送回服务器。现在，服务器验证该令牌并在第一次请求中发送相应的公钥。我有工作的java代码，这是上面的事情。

String privateKey = sharedPref.getString("privateKey", ""); 

byte [] decoded = Base64.decode(privateKey, Base64.NO_WRAP); 

KeyFactory kf = KeyFactory.getInstance("RSA"); 
PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(decoded); 
PrivateKey privateKeyNew = kf.generatePrivate(keySpec); 

String tokenSp = sharedPref.getString("token", ""); 
byte[] tokenBytes = tokenSp.getBytes(); 
Signature dsa = Signature.getInstance("SHA1withRSA"); 
dsa.initSign(privateKeyNew); 
dsa.update(tokenBytes); 
byte[] signedData = dsa.sign(); 

ByteArrayOutputStream baos = new ByteArrayOutputStream(); 
baos.write(tokenBytes); 
baos.write(signedData); 

byte[] finalout = baos.toByteArray(); 
signedToken = new String(Base64.encode(finalout, 0, finalout.length, Base64.NO_WRAP)); 

我想在c＃中实现相同。我写的代码是：

UnicodeEncoding ByteConverter = new UnicodeEncoding(); 

CspParameters parameters = new CspParameters(); 
parameters.KeyContainerName = "MyContainer"; 
RSACryptoServiceProvider obj = new RSACryptoServiceProvider(parameters); 

byte[] dataToEncrypt=ByteConverter.GetBytes(s[0]); 
byte[] SignedData=obj.SignData(dataToEncrypt, "SHA256"); 

MemoryStream stream = new MemoryStream(); 
stream.Write(dataToEncrypt,0,dataToEncrypt.Count()); 
stream.Write(SignedData,0,SignedData.Count()); 

byte[] finalBytesToSend = stream.ToArray(); 

string s2 = Convert.ToBase64String(finalBytesToSend); 
return s2;  

而对于服务器我送“SHA256”作为公共密钥verify.Is它更正一下，我在C＃中做了什么？

Answer 1

我相信你需要的东西就像下面这样。您可能需要检查publicKeyXml并对格式稍作修改。

// create a RSA provider with a 1024 bits key 
using(RSACryptoServiceProvider rsaProv = new RSACryptoServiceProvider(1024)) 
{ 
    // export public key and send it to server to obtain base64 token 
    string publicKeyXml = rsaProv.ToXmlString(false); 
    string base64TokenFromServer = GetTokenFromServer(publicKeyXml); 

    // decode base64 token 
    byte[] tokenBytes = Convert.FromBase64String(base64TokenFromServer); 

    // sign token bytes using RSA provider's private key and SHA1 
    byte[] tokenSignatureBytes; 
    using (var ms = new MemoryStream(tokenBytes)) 
    { 
     tokenSignatureBytes = rsaProv.SignData(ms, SHA1.Create()); 
    } 

    // concat token bytes and signature bytes 
    byte[] finalOut; 
    using (var ms = new MemoryStream()) 
    { 
     ms.Write(tokenBytes, 0, tokenBytes.Length); 
     ms.Write(tokenSignatureBytes, 0, tokenSignatureBytes.Length); 
     ms.Flush(); 
     finalOut = ms.ToArray(); 
    } 

    // encode final out to base64 
    string signedToken = Convert.ToBase64String(finalOut); 
}