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/*
* TLS Cipher Suites
* (C) 2004-2011,2012 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#ifndef BOTAN_TLS_CIPHER_SUITES_H__
#define BOTAN_TLS_CIPHER_SUITES_H__
#include <botan/types.h>
#include <string>
#include <vector>
namespace Botan {
namespace TLS {
/**
* Ciphersuite Information
*/
class BOTAN_DLL Ciphersuite
{
public:
/**
* Convert an SSL/TLS ciphersuite to algorithm fields
* @param suite the ciphersuite code number
* @return ciphersuite object
*/
static Ciphersuite by_id(uint16_t suite);
/**
* Returns true iff this suite is a known SCSV
*/
static bool is_scsv(uint16_t suite);
/**
* Generate a static list of all known ciphersuites and return it.
*
* @return list of all known ciphersuites
*/
static const std::vector<Ciphersuite>& all_known_ciphersuites();
/**
* Formats the ciphersuite back to an RFC-style ciphersuite string
* @return RFC ciphersuite string identifier
*/
std::string to_string() const { return m_iana_id; }
/**
* @return ciphersuite number
*/
uint16_t ciphersuite_code() const { return m_ciphersuite_code; }
/**
* @return true if this is a PSK ciphersuite
*/
bool psk_ciphersuite() const;
/**
* @return true if this is an ECC ciphersuite
*/
bool ecc_ciphersuite() const;
/**
* @return true if this suite uses a CBC cipher
*/
bool cbc_ciphersuite() const;
/**
* @return key exchange algorithm used by this ciphersuite
*/
std::string kex_algo() const { return m_kex_algo; }
/**
* @return signature algorithm used by this ciphersuite
*/
std::string sig_algo() const { return m_sig_algo; }
/**
* @return symmetric cipher algorithm used by this ciphersuite
*/
std::string cipher_algo() const { return m_cipher_algo; }
/**
* @return message authentication algorithm used by this ciphersuite
*/
std::string mac_algo() const { return m_mac_algo; }
std::string prf_algo() const
{
if(m_prf_algo && *m_prf_algo)
return m_prf_algo;
return m_mac_algo;
}
/**
* @return cipher key length used by this ciphersuite
*/
size_t cipher_keylen() const { return m_cipher_keylen; }
size_t nonce_bytes_from_record() const { return m_nonce_bytes_from_record; }
size_t nonce_bytes_from_handshake() const { return m_nonce_bytes_from_handshake; }
size_t mac_keylen() const { return m_mac_keylen; }
/**
* @return true if this is a valid/known ciphersuite
*/
bool valid() const { return m_usable; }
bool operator<(const Ciphersuite& o) const { return ciphersuite_code() < o.ciphersuite_code(); }
bool operator<(const uint16_t c) const { return ciphersuite_code() < c; }
Ciphersuite() {}
private:
bool is_usable() const;
Ciphersuite(uint16_t ciphersuite_code,
const char* iana_id,
const char* sig_algo,
const char* kex_algo,
const char* cipher_algo,
size_t cipher_keylen,
size_t nonce_bytes_from_handshake,
size_t nonce_bytes_from_record,
const char* mac_algo,
size_t mac_keylen,
const char* prf_algo) :
m_ciphersuite_code(ciphersuite_code),
m_iana_id(iana_id),
m_sig_algo(sig_algo),
m_kex_algo(kex_algo),
m_prf_algo(prf_algo),
m_cipher_algo(cipher_algo),
m_mac_algo(mac_algo),
m_cipher_keylen(cipher_keylen),
m_nonce_bytes_from_handshake(nonce_bytes_from_handshake),
m_nonce_bytes_from_record(nonce_bytes_from_record),
m_mac_keylen(mac_keylen)
{
m_usable = is_usable();
}
uint16_t m_ciphersuite_code = 0;
/*
All of these const char* strings are references to compile time
constants in tls_suite_info.cpp
*/
const char* m_iana_id = nullptr;
const char* m_sig_algo = nullptr;
const char* m_kex_algo = nullptr;
const char* m_prf_algo = nullptr;
const char* m_cipher_algo = nullptr;
const char* m_mac_algo = nullptr;
size_t m_cipher_keylen = 0;
size_t m_nonce_bytes_from_handshake = 0;
size_t m_nonce_bytes_from_record = 0;
size_t m_mac_keylen = 0;
bool m_usable = false;
};
}
}
#endif
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