init commit

output/Libraries/BouncyCastle.Crypto/Org/BouncyCastle/Crypto/Tls/TlsRsaSigner.cs

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+using System;
+using Org.BouncyCastle.Crypto.Digests;
+using Org.BouncyCastle.Crypto.Encodings;
+using Org.BouncyCastle.Crypto.Engines;
+using Org.BouncyCastle.Crypto.Parameters;
+using Org.BouncyCastle.Crypto.Signers;
+
+namespace Org.BouncyCastle.Crypto.Tls;
+
+public class TlsRsaSigner : AbstractTlsSigner
+{
+	public override byte[] GenerateRawSignature(SignatureAndHashAlgorithm algorithm, AsymmetricKeyParameter privateKey, byte[] hash)
+	{
+		ISigner signer = MakeSigner(algorithm, raw: true, forSigning: true, new ParametersWithRandom(privateKey, mContext.SecureRandom));
+		signer.BlockUpdate(hash, 0, hash.Length);
+		return signer.GenerateSignature();
+	}
+
+	public override bool VerifyRawSignature(SignatureAndHashAlgorithm algorithm, byte[] sigBytes, AsymmetricKeyParameter publicKey, byte[] hash)
+	{
+		ISigner signer = MakeSigner(algorithm, raw: true, forSigning: false, publicKey);
+		signer.BlockUpdate(hash, 0, hash.Length);
+		return signer.VerifySignature(sigBytes);
+	}
+
+	public override ISigner CreateSigner(SignatureAndHashAlgorithm algorithm, AsymmetricKeyParameter privateKey)
+	{
+		return MakeSigner(algorithm, raw: false, forSigning: true, new ParametersWithRandom(privateKey, mContext.SecureRandom));
+	}
+
+	public override ISigner CreateVerifyer(SignatureAndHashAlgorithm algorithm, AsymmetricKeyParameter publicKey)
+	{
+		return MakeSigner(algorithm, raw: false, forSigning: false, publicKey);
+	}
+
+	public override bool IsValidPublicKey(AsymmetricKeyParameter publicKey)
+	{
+		if (publicKey is RsaKeyParameters)
+		{
+			return !publicKey.IsPrivate;
+		}
+		return false;
+	}
+
+	protected virtual ISigner MakeSigner(SignatureAndHashAlgorithm algorithm, bool raw, bool forSigning, ICipherParameters cp)
+	{
+		if (algorithm != null != TlsUtilities.IsTlsV12(mContext))
+		{
+			throw new InvalidOperationException();
+		}
+		if (algorithm != null && algorithm.Signature != 1)
+		{
+			throw new InvalidOperationException();
+		}
+		IDigest digest = (raw ? new NullDigest() : ((algorithm != null) ? TlsUtilities.CreateHash(algorithm.Hash) : new CombinedHash()));
+		ISigner signer = ((algorithm == null) ? ((ISigner)new GenericSigner(CreateRsaImpl(), digest)) : ((ISigner)new RsaDigestSigner(digest, TlsUtilities.GetOidForHashAlgorithm(algorithm.Hash))));
+		signer.Init(forSigning, cp);
+		return signer;
+	}
+
+	protected virtual IAsymmetricBlockCipher CreateRsaImpl()
+	{
+		return new Pkcs1Encoding(new RsaBlindedEngine());
+	}
+}