SHA512withRSA簽名驗證.Net

我有一個「SHA512withRSA」簽名，已簽名的數據和公鑰（以base64格式），由第三方發送給我。我需要使用公鑰驗證給定數據的簽名是否正確。SHA512withRSA簽名驗證.Net

基本問題是如何在.Net（最好是C＃代碼）中進行驗證？

這是可能的只有.Net框架（它似乎不，似乎RSACryptoServiceProvider是相關的類，但它只支持SHA1作爲簽名算法）？

如果不是，我可以使用哪些庫來實現此目的？我一直在嘗試BouncyCastle，但我找不到解釋如何清楚地做到這一點的文檔。幾乎所有的文檔都是關於處理證書的，我既沒有也不想要證書。

編輯：新示例代碼（仍未）

using System; 
using System.Collections.Generic; 
using System.Diagnostics; 
using System.IO; 
using System.Linq; 
using System.Security.Cryptography; 
using System.Text; 
using System.Threading.Tasks; 

namespace SignatureVerificationTest 
{ 
    class Program 
    { 
     static void Main(string[] args) 
     { 
      var t = DoWorkAsync(); 
      Console.ReadLine(); 
     } 

     public static async Task DoWorkAsync() 
     { 
      var rawNotificationData = "merchantOrderId=e7ea4e4c-7ffa-4b19-8af9-ad875c493620&status=AUTHORISED&signature=hgvtCb6RjmhtumXTNuARW8fotZVoIJ%2FAaqXEow1pxA0Ic5afe0j2lGHO%2F6Q7rnPXqd728mMsmkjQSyxGDho7imxYGHEyEudt%2B%2FThOboAj%2FhePNLNfCeJR7DS7LIzO7SCTDkkTHZ%2F5sD5JhBATY3EFADrLnzzlF445mNRP%2Bv2vi3ogVC5k3oYfPCSmvOzd8DFUp6E6cwZelBGQjRHwVJf07%2B8x4esYxW%2FJii3z6quXzaKpImLFt3jaDTe109uwTwsv8bRBh%2F%2FSjFlHPaEr5QTAjTDA0IrMP6OggGTDkukW8sr7PUmQoq%2B4%2FLEIlHqXbuwZgJ2zr7fN75CcwWaj6FHfdiVvmeKGshO11DnHX7rN%2FTU36z7D7jRp%2Fykd4q409MorZUfZspHuXp2XRXo1732OZKRdYkX73eDphFKQUbmhGCf9wQq3xxxlw6Qr3ClTAi8SbOeY8IQIul%2Bp3x0X5G%2FiJmtiMcHMErxxCx2Y84OozrbvMEQP8qzY4FLUuV%2BKv9oragcXfDvpkJ4EAAqZPufXGZ3zCyk5yBJEXy6kqZ7ht16bpuD0aQMBlq2eTyQCOgtRvOPCFJYwCVJ8z43xQShffKa9Tj7gSgPE9LfvD3%2Ba4NdEh0Hg5yV7A7wABLySC%2F3thXvxVfVthNJEfdHZPhpAN2i3C5sql09R27k5SEV96c%3D"; 

      //Find the signature in the data, and url decode the value 
      var x = rawNotificationData.Split(new char[] { '&' }); 

      string notificationSignature = null; 
      foreach (var kvp in x) 
      { 
       var parts = kvp.Split(new char[] { '=' }); 
       if (parts[0] == "signature") 
       { 
        notificationSignature = Uri.UnescapeDataString(parts[1]); 
        break; 
       } 
      } 

      // Get the portion of the string that was signed 
      // Should be; 
      // merchantOrderId=e7ea4e4c-7ffa-4b19-8af9-ad875c493620&status=AUTHORISED 
      var signedData = rawNotificationData.Substring(0, rawNotificationData.IndexOf("&signature=", StringComparison.OrdinalIgnoreCase)); 


      //Define the public key (base 64 encoded string) 
      var publicKey = @"MIICIjANBgkqhkiG9w0BAQEFAAOCAg8AMIICCgKCAgEAv3kDhkB2yHn/4N1KtNsm 
8IuWuqfnOIDxOnR2txELEtKL1YqSTiAtoBHWfvGg2OMN1gu0/owecT7d9+TnXx7M 
NE4CGp3UOLkdTzRifDMrMh5T9WVvyKfV4Chnv/tkmK7BMSe+yS4T+3IQVBv0zFKu 
Hm9Y8Zicc5sIkTRdpgeg1wbYZkbKA5qZcYkKUKpWHKmWVMyIqqhwAcKFA9dc0j8f 
h6EM3JWQhFOFkXngUHX4O+L2mJ7rnYsMZzujoK3fNk/HIHYtJiZbkbEOzlDGhzp0 
ZackirqZ2iqPRSgZsVcyqTthNiYxjkOvB5AYb/Ww+3T/UQ2zaB0ac7dgLKrq8BL5 
HpVke93F4kQQ6M1BmIWfLiQt3FLRX+LxkcNC5q1SaPW8D/7lnYACM0JErrpA8/Dc 
7U7Th6R8Wk99V8O0FN6+t9gr3lwG99Hw7AykstlPWMdFDch+ljM4JGf/hvxcZDlp 
ACSRPf1BXNON1E6WMofyAXNSsuQ3kG/go0f5pzix+K/484y4PPKizbWTGWElK9sJ 
d2jDFEGG5iCoFzJNLvEvuvzHHhP+cM5y7LTX7D0B8LPdj1kIEboTAIfdhQ1IVVYa 
mSo7WTB/sHgxGk9+8K3EboGAzSmgIqlLrMZob1h8/32LsVSxKhgxs01tGotB7rJO 
MmwP7rPHQjvq0NoPMTFPd+ECAwEAAQ=="; 

      // Decode the base64 key into raw bytes 
      // (Decodes to 550 bytes) 
      var rawKey = Convert.FromBase64String(publicKey); 

      //Create an RSA crypto provider instance initialised with the key 
      //Decodes to a 512 byte modulus and 3 (1, 0, 1) byte exponent 
      using (var rsa = CreateRsa(rawKey)) 
      { 
       bool signatureVerified = rsa.VerifyData 
       (
        System.Text.UTF8Encoding.UTF8.GetBytes(signedData), 
        CryptoConfig.MapNameToOID("SHA512"), 
        Convert.FromBase64String(notificationSignature) 
       ); 

       //Fail if the signature didn't verify 
       Debug.Assert(signatureVerified, "Signature did not verify."); 
      } 
     } 

     private static readonly byte[] SeqOID = { 0x30, 0x0D, 0x06, 0x09, 0x2A, 0x86, 0x48, 0x86, 0xF7, 0x0D, 0x01, 0x01, 0x01, 0x05, 0x00 }; 

     private static RSACryptoServiceProvider CreateRsa(byte[] publicKey) 
     { 
      /* 

      This code parses the publickey bytes to extract the relevant bits of the public key, the initialises 
      the rsa crypto provider with the key. 
      Taken from "CreateRsa" below is modified from http://www.jensign.com/JavaScience/dotnet/pempublic/ 

      Original license below applies. 

      Copyright(c) 2006 - 2014 JavaScience Consulting, Michel Gallant 

      Permission is hereby granted, free of charge, to any person obtaining a copy 
      of this software and associated documentation files(the "Software"), to deal 
      in the Software without restriction, including without limitation the rights 
      to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 
      copies of the Software, and to permit persons to whom the Software is 
      furnished to do so, subject to the following conditions: 

      The above copyright notice and this permission notice shall be included in 
      all copies or substantial portions of the Software. 

      THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 
      IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
      FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE 
      AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 
      LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 
      OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 
      THE SOFTWARE. 
      */ 

      var mem = new System.IO.MemoryStream(publicKey); 
      BinaryReader binr = new BinaryReader(mem); //wrap Memory Stream with BinaryReader for easy reading 
      byte bt = 0; 
      ushort twobytes = 0; 

      twobytes = binr.ReadUInt16(); 
      if (twobytes == 0x8130) //data read as little endian order (actual data order for Sequence is 30 81) 
       binr.ReadByte(); //advance 1 byte 
      else if (twobytes == 0x8230) 
       binr.ReadInt16(); //advance 2 bytes 
      else 
       return null; 

      var seq = binr.ReadBytes(15); //read the Sequence OID 
      if (!CompareBytearrays(seq, SeqOID)) //make sure Sequence for OID is correct 
       return null; 

      twobytes = binr.ReadUInt16(); 
      if (twobytes == 0x8103) //data read as little endian order (actual data order for Bit String is 03 81) 
       binr.ReadByte(); //advance 1 byte 
      else if (twobytes == 0x8203) 
       binr.ReadInt16(); //advance 2 bytes 
      else 
       return null; 

      bt = binr.ReadByte(); 
      if (bt != 0x00) //expect null byte next 
       return null; 

      twobytes = binr.ReadUInt16(); 
      if (twobytes == 0x8130) //data read as little endian order (actual data order for Sequence is 30 81) 
       binr.ReadByte(); //advance 1 byte 
      else if (twobytes == 0x8230) 
       binr.ReadInt16(); //advance 2 bytes 
      else 
       return null; 

      twobytes = binr.ReadUInt16(); 
      byte lowbyte = 0x00; 
      byte highbyte = 0x00; 

      if (twobytes == 0x8102) //data read as little endian order (actual data order for Integer is 02 81) 
       lowbyte = binr.ReadByte(); // read next bytes which is bytes in modulus 
      else if (twobytes == 0x8202) 
      { 
       highbyte = binr.ReadByte(); //advance 2 bytes 
       lowbyte = binr.ReadByte(); 
      } 
      else 
       return null; 
      byte[] modint = { lowbyte, highbyte, 0x00, 0x00 }; //reverse byte order since asn.1 key uses big endian order 
      int modsize = BitConverter.ToInt32(modint, 0); 

      int firstbyte = binr.PeekChar(); 
      if (firstbyte == 0x00) 
      { //if first byte (highest order) of modulus is zero, don't include it 
       binr.ReadByte(); //skip this null byte 
       modsize -= 1; //reduce modulus buffer size by 1 
      } 

      byte[] modulus = binr.ReadBytes(modsize); //read the modulus bytes 

      if (binr.ReadByte() != 0x02)  //expect an Integer for the exponent data 
       return null; 
      int expbytes = (int)binr.ReadByte(); // should only need one byte for actual exponent data (for all useful values) 
      byte[] exponent = binr.ReadBytes(expbytes); 

      // ------- create RSACryptoServiceProvider instance and initialize with public key ----- 
      RSACryptoServiceProvider RSA = new RSACryptoServiceProvider(); 
      RSAParameters RSAKeyInfo = new RSAParameters(); 
      RSAKeyInfo.Modulus = modulus; 
      RSAKeyInfo.Exponent = exponent; 
      RSA.ImportParameters(RSAKeyInfo); 
      RSA.PersistKeyInCsp = false; 
      return RSA; 
     } 

     private static bool CompareBytearrays(byte[] a, byte[] b) 
     { 
      if (a.Length != b.Length) 
       return false; 
      int i = 0; 
      foreach (byte c in a) 
      { 
       if (c != b[i]) 
        return false; 
       i++; 
      } 
      return true; 
     } 

    } 
}

來源

2016-12-02 Yort

所以我也試過這裏的代碼; http://stackoverflow.com/questions/8437288/signing-and-verifying-signatures-with-rsa-c-sharp - 它驗證自己創建的簽名，但不是我給的那些簽名（用我的密鑰給出）。 RSA.SigningAlgorithm屬性仍然表示SHA1，但我不知道這是否重要。 – Yort

如果代碼有效並且只有公鑰是錯誤的，那麼應該關閉該問題，因爲錯誤在代碼中不明顯。 –

的RSACryptoServiceProvider能做到這一點，前提是你必須存儲在PROV_RSA_AES（24）的關鍵，而不是PROV_RSA_FULL（1）。

new RSACryptoServiceProvider()應作出PROV_RSA_AES了，所以，我希望它是錯誤的導入密鑰的唯一方法是，如果您還指定了一個CspParameters輸入（並明確改變了dwProvType值）。

如果你有一個現有的RSACryptoServiceProvider對象，你可以打開一個新的與

CspParameters keyParams = new CspParameters(); 
CspKeyContainerInfo keyInfo = currentKey.CspKeyContainerInfo; 
keyParams.KeyContainerName = keyInfo.KeyContainerName; 
keyParams.ProviderType = 24 /*PROV_RSA_AES*/; 
keyParams.KeyNumber = (int)keyInfo.KeyNumber; 
keyParams.Flags = CspProviderFlags.UseExistingKey; 

if (keyInfo.MachineKeyStore) 
    keyParams.Flags |= CspProviderFlags.UseMachineKeyStore; 

return new RSACryptoServiceProvider(keyParams);

或者，如果你在.NET 4.6+，切換到RSACng，這對SHA-更穩定的支持2個簽名。

來源

2016-12-05 22:16:49 bartonjs

欣賞幫助，但當我嘗試獲取CryptographicException並顯示錯誤消息「密鑰不存在」時。讓我編輯這個問題，包括一些示例代碼，看看是否有人能夠發現我的愚蠢。我是一個加密noob，所以它可能是我正在做的愚蠢的事情。謝謝。 – Yort

在與提供信息的第三方討論後，我看到了錯誤的公鑰。切換到正確的公鑰後，驗證成功。

來源

2016-12-06 02:08:44 Yort

SHA512withRSA簽名驗證.Net

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