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/*
* TLS Protocol Version Management
* (C) 2012 Jack Lloyd
*
* Released under the terms of the Botan license
*/
#ifndef BOTAN_TLS_PROTOCOL_VERSION_H__
#define BOTAN_TLS_PROTOCOL_VERSION_H__
#include <botan/get_byte.h>
#include <string>
namespace Botan {
namespace TLS {
/**
* TLS Protocol Version
*/
class BOTAN_DLL Protocol_Version
{
public:
enum Version_Code {
SSL_V3 = 0x0300,
TLS_V10 = 0x0301,
TLS_V11 = 0x0302,
TLS_V12 = 0x0303,
DTLS_V10 = 0xFEFF,
DTLS_V12 = 0xFEFD
};
static Protocol_Version latest_tls_version()
{
return Protocol_Version(TLS_V12);
}
static Protocol_Version latest_dtls_version()
{
return Protocol_Version(DTLS_V12);
}
Protocol_Version() : m_version(0) {}
/**
* @param named_version a specific named version of the protocol
*/
Protocol_Version(Version_Code named_version) :
m_version(static_cast<u16bit>(named_version)) {}
/**
* @param major the major version
* @param minor the minor version
*/
Protocol_Version(byte major, byte minor) :
m_version((static_cast<u16bit>(major) << 8) | minor) {}
/**
* @return true if this is a valid protocol version
*/
bool valid() const { return (m_version != 0); }
/**
* @return true if this is a protocol version we know about
*/
bool known_version() const;
/**
* @return major version of the protocol version
*/
byte major_version() const { return get_byte(0, m_version); }
/**
* @return minor version of the protocol version
*/
byte minor_version() const { return get_byte(1, m_version); }
/**
* @return human-readable description of this version
*/
std::string to_string() const;
/**
* If this version is known, return that. Otherwise return the
* best (most recent) version we know of.
* @return best matching protocol version
*/
Protocol_Version best_known_match() const;
/**
* @return true iff this is a DTLS version
*/
bool is_datagram_protocol() const;
/**
* @return true if this version supports negotiable signature algorithms
*/
bool supports_negotiable_signature_algorithms() const;
/**
* @return true if this version uses explicit IVs for block ciphers
*/
bool supports_explicit_cbc_ivs() const;
/**
* @return true if this version uses a ciphersuite specific PRF
*/
bool supports_ciphersuite_specific_prf() const;
/**
* @return if this version is equal to other
*/
bool operator==(const Protocol_Version& other) const
{
return (m_version == other.m_version);
}
/**
* @return if this version is not equal to other
*/
bool operator!=(const Protocol_Version& other) const
{
return (m_version != other.m_version);
}
/**
* @return if this version is later than other
*/
bool operator>(const Protocol_Version& other) const;
private:
u16bit m_version;
};
}
}
#endif
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