2 files changed, 6 insertions, 0 deletions
diff --git a/crypto/src/crypto/tls/DtlsServerProtocol.cs b/crypto/src/crypto/tls/DtlsServerProtocol.cs
index e2e9eddfc..c556d6320 100644
--- a/crypto/src/crypto/tls/DtlsServerProtocol.cs
+++ b/crypto/src/crypto/tls/DtlsServerProtocol.cs
@@ -156,6 +156,9 @@ namespace Org.BouncyCastle.Crypto.Tls
                 state.certificateRequest = state.server.GetCertificateRequest();
                 if (state.certificateRequest != null)
                 {
+                    if (TlsUtilities.IsTlsV12(state.serverContext) != (state.certificateRequest.SupportedSignatureAlgorithms != null))
+                        throw new TlsFatalAlert(AlertDescription.internal_error);
+
                     state.keyExchange.ValidateCertificateRequest(state.certificateRequest);
 
                     byte[] certificateRequestBody = GenerateCertificateRequest(state, state.certificateRequest);
diff --git a/crypto/src/crypto/tls/TlsServerProtocol.cs b/crypto/src/crypto/tls/TlsServerProtocol.cs
index 5716c0cd1..1b790c9e0 100644
--- a/crypto/src/crypto/tls/TlsServerProtocol.cs
+++ b/crypto/src/crypto/tls/TlsServerProtocol.cs
@@ -200,6 +200,9 @@ namespace Org.BouncyCastle.Crypto.Tls
                         this.mCertificateRequest = mTlsServer.GetCertificateRequest();
                         if (this.mCertificateRequest != null)
                         {
+                            if (TlsUtilities.IsTlsV12(Context) != (mCertificateRequest.SupportedSignatureAlgorithms != null))
+                                throw new TlsFatalAlert(AlertDescription.internal_error);
+
                             this.mKeyExchange.ValidateCertificateRequest(mCertificateRequest);
 
                             SendCertificateRequestMessage(mCertificateRequest);