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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/md5.h>
#include <botan/sha160.h>
#include <botan/sha2_32.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)
{
SecureVector<byte> output;
if(version == Protocol_Version::TLS_V10 || version == Protocol_Version::TLS_V11)
{
MD5 md5;
SHA_160 sha1;
md5.update(data);
sha1.update(data);
output += md5.final();
output += sha1.final();
}
else if(version == Protocol_Version::TLS_V12)
{
// This might depend on the ciphersuite
SHA_256 sha256;
sha256.update(data);
output += sha256.final();
}
else
throw TLS_Exception(Alert::PROTOCOL_VERSION,
"Unknown version for handshake hashes");
return output;
}
/**
* Return a SSLv3 Handshake Hash
*/
SecureVector<byte> Handshake_Hash::final_ssl3(const MemoryRegion<byte>& secret)
{
const byte PAD_INNER = 0x36, PAD_OUTER = 0x5C;
MD5 md5;
SHA_160 sha1;
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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