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/*
* TLS Protocol Version Management
* (C) 2012 Jack Lloyd
*
* Released under the terms of the Botan license
*/
#include <botan/tls_version.h>
#include <botan/tls_exceptn.h>
#include <botan/parsing.h>
namespace Botan {
namespace TLS {
std::string Protocol_Version::to_string() const
{
const byte maj = major_version();
const byte min = minor_version();
if(maj == 3 && min == 0)
return "SSL v3";
if(maj == 3 && min >= 1) // TLS v1.x
return "TLS v1." + std::to_string(min-1);
if(maj == 254) // DTLS 1.x
return "DTLS v1." + std::to_string(255 - min);
// Some very new or very old protocol (or bogus data)
return "Unknown " + std::to_string(maj) + "." + std::to_string(min);
}
bool Protocol_Version::is_datagram_protocol() const
{
return major_version() == 254;
}
bool Protocol_Version::operator>(const Protocol_Version& other) const
{
if(this->is_datagram_protocol() != other.is_datagram_protocol())
throw TLS_Exception(Alert::PROTOCOL_VERSION,
"Version comparing " + to_string() +
" with " + other.to_string());
if(this->is_datagram_protocol())
return m_version < other.m_version; // goes backwards
return m_version > other.m_version;
}
Protocol_Version Protocol_Version::best_known_match() const
{
if(known_version())
return *this; // known version is its own best match
if(is_datagram_protocol())
return Protocol_Version::DTLS_V12;
else
return Protocol_Version::TLS_V12;
}
bool Protocol_Version::known_version() const
{
return (m_version == Protocol_Version::SSL_V3 ||
m_version == Protocol_Version::TLS_V10 ||
m_version == Protocol_Version::TLS_V11 ||
m_version == Protocol_Version::TLS_V12 ||
m_version == Protocol_Version::DTLS_V10 ||
m_version == Protocol_Version::DTLS_V12);
}
bool Protocol_Version::supports_negotiable_signature_algorithms() const
{
return (m_version == Protocol_Version::TLS_V12 ||
m_version == Protocol_Version::DTLS_V12);
}
bool Protocol_Version::supports_explicit_cbc_ivs() const
{
return (m_version == Protocol_Version::TLS_V11 ||
m_version == Protocol_Version::TLS_V12 ||
m_version == Protocol_Version::DTLS_V10 ||
m_version == Protocol_Version::DTLS_V12);
}
bool Protocol_Version::supports_ciphersuite_specific_prf() const
{
return (m_version == Protocol_Version::TLS_V12 ||
m_version == Protocol_Version::DTLS_V12);
}
}
}
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