1 files changed, 73 insertions, 0 deletions
diff --git a/Crypto/src/crypto/tls/DefaultTlsCipherFactory.cs b/Crypto/src/crypto/tls/DefaultTlsCipherFactory.cs
new file mode 100644
index 000000000..53e3438d9
--- /dev/null
+++ b/Crypto/src/crypto/tls/DefaultTlsCipherFactory.cs
@@ -0,0 +1,73 @@
+using System;
+using System.IO;
+
+using Org.BouncyCastle.Crypto.Digests;
+using Org.BouncyCastle.Crypto.Engines;
+using Org.BouncyCastle.Crypto.Modes;
+
+namespace Org.BouncyCastle.Crypto.Tls
+{
+	public class DefaultTlsCipherFactory
+		: TlsCipherFactory
+	{
+		public virtual TlsCipher CreateCipher(TlsClientContext context,
+			EncryptionAlgorithm encryptionAlgorithm, DigestAlgorithm digestAlgorithm)
+		{
+			switch (encryptionAlgorithm)
+			{
+				case EncryptionAlgorithm.cls_3DES_EDE_CBC:
+					return CreateDesEdeCipher(context, 24, digestAlgorithm);
+				case EncryptionAlgorithm.AES_128_CBC:
+					return CreateAesCipher(context, 16, digestAlgorithm);
+				case EncryptionAlgorithm.AES_256_CBC:
+					return CreateAesCipher(context, 32, digestAlgorithm);
+				default:
+					throw new TlsFatalAlert(AlertDescription.internal_error);
+			}
+		}
+
+		/// <exception cref="IOException"></exception>
+		protected virtual TlsCipher CreateAesCipher(TlsClientContext context, int cipherKeySize,
+			DigestAlgorithm digestAlgorithm)
+		{
+			return new TlsBlockCipher(context, CreateAesBlockCipher(), CreateAesBlockCipher(),
+				CreateDigest(digestAlgorithm), CreateDigest(digestAlgorithm), cipherKeySize);
+		}
+
+		/// <exception cref="IOException"></exception>
+		protected virtual TlsCipher CreateDesEdeCipher(TlsClientContext context, int cipherKeySize,
+			DigestAlgorithm digestAlgorithm)
+		{
+			return new TlsBlockCipher(context, CreateDesEdeBlockCipher(), CreateDesEdeBlockCipher(),
+				CreateDigest(digestAlgorithm), CreateDigest(digestAlgorithm), cipherKeySize);
+		}
+
+		protected virtual IBlockCipher CreateAesBlockCipher()
+		{
+			return new CbcBlockCipher(new AesFastEngine());
+		}
+
+		protected virtual IBlockCipher CreateDesEdeBlockCipher()
+		{
+			return new CbcBlockCipher(new DesEdeEngine());
+		}
+
+		/// <exception cref="IOException"></exception>
+		protected virtual IDigest CreateDigest(DigestAlgorithm digestAlgorithm)
+		{
+			switch (digestAlgorithm)
+			{
+				case DigestAlgorithm.MD5:
+					return new MD5Digest();
+				case DigestAlgorithm.SHA:
+					return new Sha1Digest();
+				case DigestAlgorithm.SHA256:
+					return new Sha256Digest();
+				case DigestAlgorithm.SHA384:
+					return new Sha384Digest();
+				default:
+					throw new TlsFatalAlert(AlertDescription.internal_error);
+			}
+		}
+	}
+}