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/*
* 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().mac_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));
}
}
}
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