SHA512withRSA .Net의 서명 확인

Question

"SHA512withRSA"서명, 서명 된 데이터 및 공개 키 (base64 형식)가 제 3 자에게 전송되었습니다. 공개 키를 사용하여 서명이 주어진 데이터에 맞는지 확인해야합니다.

기본 질문은 .Net (이 C# 코드)에서 어떻게 확인합니까?

.Net 프레임 워크에서만 가능합니다 (RSACryptoServiceProvider는 관련 클래스이지만 SHA1을 서명 알고리즘으로 지원함).

그렇지 않은 경우 어떤 라이브러리를 사용할 수 있습니까? 나는 BouncyCastle을 시도해 왔지만 이것을 명확하게 설명하는 문서를 찾을 수는 없습니다. 거의 모든 문서는 인증서를 다루는 것에 관한 것이고, 나는 인증서를 갖고 있지도 원하지도 않는다.

편집 : 새로운 샘플 코드 (계속 실패)

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; 
     } 

    } 
} 

Answer 1

RSACryptoServiceProvider이 그것을 할 수있는 대신 PROV_RSA_FULL, 당신은 PROV_RSA_AES (24)에 저장된 키를 가지고 제공 (1).

new RSACryptoServiceProvider() 이미 PROV_RSA_AES을해야한다, 그래서 당신은 또한 CspParameters 입력을 지정 (명시 적으로 dwProvType 값을 변경)하면 나는 그것이 키를 가져 오기위한 잘못된 것으로 기대할 수있는 유일한 방법입니다.

기존 RSACryptoServiceProvider 개체가있는 경우 당신은 당신이 .NET 4.6+에 있다면, SHA-훨씬 더 안정적인 지원이있는, RSACng로 전환,

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); 

와 새를 열거 나 수 2 개의 서명.

Answer 2

정보를 제공하는 제 3 자와 논의한 후에 잘못된 공개 키를 받았습니다. 올바른 공개 키로 전환하면 이제 인증이 성공합니다.