1 files changed, 104 insertions, 0 deletions
diff --git a/lib/tls/msg_finished.cpp b/lib/tls/msg_finished.cpp
new file mode 100644
index 000000000..c018497c8
--- /dev/null
+++ b/lib/tls/msg_finished.cpp
@@ -0,0 +1,104 @@
+/*
+* Finished Message
+* (C) 2004-2006,2012 Jack Lloyd
+*
+* Released under the terms of the Botan license
+*/
+
+#include <botan/internal/tls_messages.h>
+#include <botan/internal/tls_handshake_io.h>
+#include <memory>
+
+namespace Botan {
+
+namespace TLS {
+
+namespace {
+
+/*
+* Compute the verify_data
+*/
+std::vector<byte> finished_compute_verify(const Handshake_State& state,
+                                          Connection_Side side)
+   {
+   if(state.version() == Protocol_Version::SSL_V3)
+      {
+      const byte SSL_CLIENT_LABEL[] = { 0x43, 0x4C, 0x4E, 0x54 };
+      const byte SSL_SERVER_LABEL[] = { 0x53, 0x52, 0x56, 0x52 };
+
+      Handshake_Hash hash = state.hash(); // don't modify state
+
+      std::vector<byte> ssl3_finished;
+
+      if(side == CLIENT)
+         hash.update(SSL_CLIENT_LABEL, sizeof(SSL_CLIENT_LABEL));
+      else
+         hash.update(SSL_SERVER_LABEL, sizeof(SSL_SERVER_LABEL));
+
+      return unlock(hash.final_ssl3(state.session_keys().master_secret()));
+      }
+   else
+      {
+      const byte TLS_CLIENT_LABEL[] = {
+         0x63, 0x6C, 0x69, 0x65, 0x6E, 0x74, 0x20, 0x66, 0x69, 0x6E, 0x69,
+         0x73, 0x68, 0x65, 0x64 };
+
+      const byte TLS_SERVER_LABEL[] = {
+         0x73, 0x65, 0x72, 0x76, 0x65, 0x72, 0x20, 0x66, 0x69, 0x6E, 0x69,
+         0x73, 0x68, 0x65, 0x64 };
+
+      std::unique_ptr<KDF> prf(state.protocol_specific_prf());
+
+      std::vector<byte> input;
+      if(side == CLIENT)
+         input += std::make_pair(TLS_CLIENT_LABEL, sizeof(TLS_CLIENT_LABEL));
+      else
+         input += std::make_pair(TLS_SERVER_LABEL, sizeof(TLS_SERVER_LABEL));
+
+      input += state.hash().final(state.version(), state.ciphersuite().prf_algo());
+
+      return unlock(prf->derive_key(12, state.session_keys().master_secret(), input));
+      }
+   }
+
+}
+
+/*
+* Create a new Finished message
+*/
+Finished::Finished(Handshake_IO& io,
+                   Handshake_State& state,
+                   Connection_Side side)
+   {
+   m_verification_data = finished_compute_verify(state, side);
+   state.hash().update(io.send(*this));
+   }
+
+/*
+* Serialize a Finished message
+*/
+std::vector<byte> Finished::serialize() const
+   {
+   return m_verification_data;
+   }
+
+/*
+* Deserialize a Finished message
+*/
+Finished::Finished(const std::vector<byte>& buf)
+   {
+   m_verification_data = buf;
+   }
+
+/*
+* Verify a Finished message
+*/
+bool Finished::verify(const Handshake_State& state,
+                      Connection_Side side) const
+   {
+   return (m_verification_data == finished_compute_verify(state, side));
+   }
+
+}
+
+}