1 files changed, 91 insertions, 0 deletions
diff --git a/comm/third_party/botan/src/lib/tls/msg_finished.cpp b/comm/third_party/botan/src/lib/tls/msg_finished.cpp
new file mode 100644
index 0000000000..47c875a518
--- /dev/null
+++ b/comm/third_party/botan/src/lib/tls/msg_finished.cpp
@@ -0,0 +1,91 @@
+/*
+* Finished Message
+* (C) 2004-2006,2012 Jack Lloyd
+*
+* Botan is released under the Simplified BSD License (see license.txt)
+*/
+
+#include <botan/tls_messages.h>
+#include <botan/kdf.h>
+#include <botan/internal/tls_handshake_io.h>
+#include <botan/internal/tls_handshake_state.h>
+
+namespace Botan {
+
+namespace TLS {
+
+namespace {
+
+/*
+* Compute the verify_data
+*/
+std::vector<uint8_t> finished_compute_verify(const Handshake_State& state,
+                                          Connection_Side side)
+   {
+   const uint8_t TLS_CLIENT_LABEL[] = {
+      0x63, 0x6C, 0x69, 0x65, 0x6E, 0x74, 0x20, 0x66, 0x69, 0x6E, 0x69,
+      0x73, 0x68, 0x65, 0x64 };
+
+   const uint8_t 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<uint8_t> input;
+   std::vector<uint8_t> label;
+   if(side == CLIENT)
+      label += std::make_pair(TLS_CLIENT_LABEL, sizeof(TLS_CLIENT_LABEL));
+   else
+      label += 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, label));
+   }
+
+}
+
+/*
+* 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<uint8_t> Finished::serialize() const
+   {
+   return m_verification_data;
+   }
+
+/*
+* Deserialize a Finished message
+*/
+Finished::Finished(const std::vector<uint8_t>& buf) : m_verification_data(buf)
+   {}
+
+/*
+* Verify a Finished message
+*/
+bool Finished::verify(const Handshake_State& state,
+                      Connection_Side side) const
+   {
+   std::vector<byte> computed_verify = finished_compute_verify(state, side);
+
+#if defined(BOTAN_UNSAFE_FUZZER_MODE)
+   return true;
+#else
+   return (m_verification_data.size() == computed_verify.size()) &&
+      constant_time_compare(m_verification_data.data(), computed_verify.data(), computed_verify.size());
+#endif
+   }
+
+}
+
+}