Verifying Java signature in C#

I have signature created in Java by following code

KeyFactory keyFactory = KeyFactory.getInstance("RSA");
EncodedKeySpec privateKeySpec = new PKCS8EncodedKeySpec(privateKeyBytes);
PrivateKey privateKey = keyFactory.generatePrivate(privateKeySpec);
signature = (Signature) rsaSha256.getCipher();

signature.initSign(privateKey);
signature.update(binaryData);
signatureBytes = signature.sign();


By verifying signature in C#, im always getting false. Following code use BouncyCastle library

ISigner signer = SignerUtilities.GetSigner("SHA256withRSA");

using (TextReader sr = new StringReader(publicKey))

PemReader pr = new PemReader(sr);
RsaKeyParameters keys = (RsaKeyParameters)pr.ReadObject();

signer.Init(false, keys);
signer.BlockUpdate(value, 0, value.Length);
bool isValid = signer.VerifySignature(signature);

return isValid;



Following code return false too

private static bool VerifyWithPublicKey(byte data, byte sig, string publicKey)

RSACryptoServiceProvider rsa;

using (var keyreader = new StringReader(publicKey))

var pemReader = new PemReader(keyreader);
var y = (RsaKeyParameters)pemReader.ReadObject();
RSAParameters p1 = DotNetUtilities.ToRSAParameters(y);
rsa = new RSACryptoServiceProvider();

rsa.ImportParameters(p1);



byte hash;
using (var sha256 = SHA256.Create())

hash = sha256.ComputeHash(data);


RSAPKCS1SignatureDeformatter RSADeformatter = new RSAPKCS1SignatureDeformatter(rsa);
RSADeformatter.SetHashAlgorithm("SHA256");
//Verify the hash and display the results to the console.
if (RSADeformatter.VerifySignature(hash, sig))

Console.WriteLine("The signature was verified.");

else

Console.WriteLine("The signature was NOT verified.");


// This always returns false
return rsa.VerifyHash(hash, CryptoConfig.MapNameToOID("SHA256"), sig);



Im out of ideas. Anyone done something similar? If so, can you share your code please

javax.crypto.Signature#sign

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