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/*
* TLS Cipher Suite
* (C) 2004-2010,2012,2013 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include <botan/tls_ciphersuite.h>
#include <botan/parsing.h>
#include <botan/block_cipher.h>
#include <botan/stream_cipher.h>
#include <botan/hash.h>
#include <algorithm>
namespace Botan {
namespace TLS {
bool Ciphersuite::is_scsv(uint16_t suite)
{
// TODO: derive from IANA file in script
return (suite == 0x00FF || suite == 0x5600);
}
bool Ciphersuite::psk_ciphersuite() const
{
return (kex_algo() == "PSK" ||
kex_algo() == "DHE_PSK" ||
kex_algo() == "ECDHE_PSK");
}
bool Ciphersuite::ecc_ciphersuite() const
{
return (sig_algo() == "ECDSA" || kex_algo() == "ECDH" || kex_algo() == "ECDHE_PSK");
}
bool Ciphersuite::cbc_ciphersuite() const
{
return (mac_algo() != "AEAD");
}
Ciphersuite Ciphersuite::by_id(uint16_t suite)
{
const std::vector<Ciphersuite>& all_suites = all_known_ciphersuites();
auto s = std::lower_bound(all_suites.begin(), all_suites.end(), suite);
if(s != all_suites.end() && s->ciphersuite_code() == suite)
{
return *s;
}
return Ciphersuite(); // some unknown ciphersuite
}
namespace {
bool have_hash(const std::string& prf)
{
return (HashFunction::providers(prf).size() > 0);
}
bool have_cipher(const std::string& cipher)
{
return (BlockCipher::providers(cipher).size() > 0) ||
(StreamCipher::providers(cipher).size() > 0);
}
}
bool Ciphersuite::is_usable() const
{
if(!m_cipher_keylen) // uninitialized object
return false;
if(!have_hash(prf_algo()))
return false;
#if !defined(BOTAN_HAS_TLS_CBC)
if(cbc_ciphersuite())
return false;
#endif
if(mac_algo() == "AEAD")
{
if(cipher_algo() == "ChaCha20Poly1305")
{
#if !defined(BOTAN_HAS_AEAD_CHACHA20_POLY1305)
return false;
#endif
}
else
{
auto cipher_and_mode = split_on(cipher_algo(), '/');
BOTAN_ASSERT(cipher_and_mode.size() == 2, "Expected format for AEAD algo");
if(!have_cipher(cipher_and_mode[0]))
return false;
const auto mode = cipher_and_mode[1];
#if !defined(BOTAN_HAS_AEAD_CCM)
if(mode == "CCM" || mode == "CCM-8")
return false;
#endif
#if !defined(BOTAN_HAS_AEAD_GCM)
if(mode == "GCM")
return false;
#endif
#if !defined(BOTAN_HAS_AEAD_OCB)
if(mode == "OCB(12)" || mode == "OCB")
return false;
#endif
}
}
else
{
// Old non-AEAD schemes
if(!have_cipher(cipher_algo()))
return false;
if(!have_hash(mac_algo())) // HMAC
return false;
}
if(kex_algo() == "SRP_SHA")
{
#if !defined(BOTAN_HAS_SRP6)
return false;
#endif
}
else if(kex_algo() == "ECDH" || kex_algo() == "ECDHE_PSK")
{
#if !defined(BOTAN_HAS_ECDH)
return false;
#endif
}
else if(kex_algo() == "DH" || kex_algo() == "DHE_PSK")
{
#if !defined(BOTAN_HAS_DIFFIE_HELLMAN)
return false;
#endif
}
else if(kex_algo() == "CECPQ1")
{
#if !defined(BOTAN_HAS_CECPQ1)
return false;
#endif
}
if(sig_algo() == "DSA")
{
#if !defined(BOTAN_HAS_DSA)
return false;
#endif
}
else if(sig_algo() == "ECDSA")
{
#if !defined(BOTAN_HAS_ECDSA)
return false;
#endif
}
else if(sig_algo() == "RSA")
{
#if !defined(BOTAN_HAS_RSA)
return false;
#endif
}
return true;
}
}
}
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