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/*
* TLS Handshake Hash
* (C) 2004-2006,2011 Jack Lloyd
*
* Released under the terms of the Botan license
*/
#include <botan/internal/tls_handshake_hash.h>
#include <botan/tls_exceptn.h>
#include <botan/libstate.h>
#include <botan/hash.h>
#include <memory>
namespace Botan {
namespace TLS {
void Handshake_Hash::update(Handshake_Type handshake_type,
const MemoryRegion<byte>& handshake_msg)
{
update(static_cast<byte>(handshake_type));
const size_t record_length = handshake_msg.size();
for(size_t i = 0; i != 3; i++)
update(get_byte<u32bit>(i+1, record_length));
update(handshake_msg);
}
/**
* Return a TLS Handshake Hash
*/
SecureVector<byte> Handshake_Hash::final(Protocol_Version version,
const std::string& mac_algo)
{
Algorithm_Factory& af = global_state().algorithm_factory();
std::auto_ptr<HashFunction> hash;
if(version == Protocol_Version::TLS_V10 || version == Protocol_Version::TLS_V11)
{
hash.reset(af.make_hash_function("TLS.Digest.0"));
}
else if(version == Protocol_Version::TLS_V12)
{
if(mac_algo == "MD5" || mac_algo == "SHA-1" || mac_algo == "SHA-256")
hash.reset(af.make_hash_function("SHA-256"));
else
hash.reset(af.make_hash_function(mac_algo));
}
else
throw TLS_Exception(Alert::PROTOCOL_VERSION,
"Unknown version for handshake hashes");
hash->update(data);
return hash->final();
}
/**
* Return a SSLv3 Handshake Hash
*/
SecureVector<byte> Handshake_Hash::final_ssl3(const MemoryRegion<byte>& secret)
{
const byte PAD_INNER = 0x36, PAD_OUTER = 0x5C;
Algorithm_Factory& af = global_state().algorithm_factory();
std::auto_ptr<HashFunction> md5(af.make_hash_function("MD5"));
std::auto_ptr<HashFunction> sha1(af.make_hash_function("SHA-1"));
md5->update(data);
sha1->update(data);
md5->update(secret);
sha1->update(secret);
for(size_t i = 0; i != 48; ++i)
md5->update(PAD_INNER);
for(size_t i = 0; i != 40; ++i)
sha1->update(PAD_INNER);
SecureVector<byte> inner_md5 = md5->final(), inner_sha1 = sha1->final();
md5->update(secret);
sha1->update(secret);
for(size_t i = 0; i != 48; ++i)
md5->update(PAD_OUTER);
for(size_t i = 0; i != 40; ++i)
sha1->update(PAD_OUTER);
md5->update(inner_md5);
sha1->update(inner_sha1);
SecureVector<byte> output;
output += md5->final();
output += sha1->final();
return output;
}
}
}
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