diff --git a/Crypto/src/crypto/tls/KeyExchangeAlgorithm.cs b/Crypto/src/crypto/tls/KeyExchangeAlgorithm.cs
new file mode 100644
index 000000000..3fdbeb2a6
--- /dev/null
+++ b/Crypto/src/crypto/tls/KeyExchangeAlgorithm.cs
@@ -0,0 +1,36 @@
+using System;
+
+namespace Org.BouncyCastle.Crypto.Tls
+{
+ public enum KeyExchangeAlgorithm
+ {
+ /*
+ * Note that the values here are implementation-specific and arbitrary.
+ * It is recommended not to depend on the particular values (e.g. serialization).
+ */
+ NULL,
+ RSA,
+ RSA_EXPORT,
+ DHE_DSS,
+ DHE_DSS_EXPORT,
+ DHE_RSA,
+ DHE_RSA_EXPORT,
+ DH_DSS,
+ DH_DSS_EXPORT,
+ DH_RSA,
+ DH_RSA_EXPORT,
+ DH_anon,
+ DH_anon_export,
+ PSK,
+ DHE_PSK,
+ RSA_PSK,
+ ECDH_ECDSA,
+ ECDHE_ECDSA,
+ ECDH_RSA,
+ ECDHE_RSA,
+ ECDH_anon,
+ SRP,
+ SRP_DSS,
+ SRP_RSA,
+ }
+}
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