Set psk_key_exchange_modes extension

1 files changed, 2 insertions, 0 deletions

diff --git a/crypto/src/tls/TlsUtilities.cs b/crypto/src/tls/TlsUtilities.cs

index 8df787b6f..b03548398 100644
--- a/crypto/src/tls/TlsUtilities.cs
+++ b/crypto/src/tls/TlsUtilities.cs
@@ -5481,6 +5481,7 @@ namespace Org.BouncyCastle.Tls
             int bindersSize = OfferedPsks.GetBindersSize(pskExternals);
 
             AddPreSharedKeyToClientExtensions(pskExternals, clientExtensions);
+            TlsExtensionsUtilities.AddPskKeyExchangeModesExtension(clientExtensions, pskKeyExchangeModes);
 
             return new OfferedPsks.BindersConfig(pskExternals, pskKeyExchangeModes, pskEarlySecrets, bindersSize);
         }
@@ -5520,6 +5521,7 @@ namespace Org.BouncyCastle.Tls
             }
 
             AddPreSharedKeyToClientExtensions(result.m_psks, clientExtensions);
+            // NOTE: psk_key_exchange_modes should already be in 'clientExtensions' from the ClientHello
 
             return result;
         }