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/**
* Finished Message Source File
* (C) 2004-2006 Jack Lloyd
*
* Released under the terms of the Botan license
*/
#include <botan/tls_messages.h>
#include <botan/prf_tls.h>
namespace Botan {
/**
* Create a new Finished message
*/
Finished::Finished(Record_Writer& writer,
Version_Code version, Connection_Side side,
const MemoryRegion<byte>& master_secret,
HandshakeHash& hash)
{
verification_data = compute_verify(master_secret, hash, side, version);
send(writer, hash);
}
/**
* Serialize a Finished message
*/
SecureVector<byte> Finished::serialize() const
{
return verification_data;
}
/**
* Deserialize a Finished message
*/
void Finished::deserialize(const MemoryRegion<byte>& buf)
{
verification_data = buf;
}
/**
* Verify a Finished message
*/
bool Finished::verify(const MemoryRegion<byte>& secret, Version_Code version,
const HandshakeHash& hash, Connection_Side side)
{
SecureVector<byte> computed = compute_verify(secret, hash, side, version);
if(computed == verification_data)
return true;
return false;
}
/**
* Compute the verify_data
*/
SecureVector<byte> Finished::compute_verify(const MemoryRegion<byte>& secret,
HandshakeHash hash,
Connection_Side side,
Version_Code version)
{
if(version == SSL_V3)
{
const byte SSL_CLIENT_LABEL[] = { 0x43, 0x4C, 0x4E, 0x54 };
const byte SSL_SERVER_LABEL[] = { 0x53, 0x52, 0x56, 0x52 };
SecureVector<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 hash.final_ssl3(secret);
}
else if(version == TLS_V10)
{
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 };
TLS_PRF prf;
SecureVector<byte> input;
if(side == CLIENT)
input.append(TLS_CLIENT_LABEL, sizeof(TLS_CLIENT_LABEL));
else
input.append(TLS_SERVER_LABEL, sizeof(TLS_SERVER_LABEL));
input.append(hash.final());
return prf.derive_key(12, secret, input);
}
else
throw Invalid_Argument("Finished message: Unknown protocol version");
}
}
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