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/**
* TLS Cipher Suites
* (C) 2004-2006 Jack Lloyd
*
* Released under the terms of the Botan license
*/
#include <botan/tls_suites.h>
#include <botan/tls_exceptn.h>
#include <botan/parsing.h>
#include <vector>
#include <string>
namespace Botan {
namespace {
/**
* Convert an SSL/TLS ciphersuite to a string
*/
std::string lookup_ciphersuite(u16bit suite)
{
if(suite == RSA_RC4_MD5) return "RSA/NONE/ARC4/16/MD5";
if(suite == RSA_RC4_SHA) return "RSA/NONE/ARC4/16/SHA1";
if(suite == RSA_3DES_SHA) return "RSA/NONE/3DES/24/SHA1";
if(suite == RSA_AES128_SHA) return "RSA/NONE/AES/16/SHA1";
if(suite == RSA_AES256_SHA) return "RSA/NONE/AES/32/SHA1";
if(suite == DHE_RSA_3DES_SHA) return "RSA/DH/3DES/24/SHA1";
if(suite == DHE_RSA_AES128_SHA) return "RSA/DH/AES/16/SHA1";
if(suite == DHE_RSA_AES256_SHA) return "RSA/DH/AES/32/SHA1";
if(suite == DHE_DSS_3DES_SHA) return "DSA/DH/3DES/24/SHA1";
if(suite == DHE_DSS_AES128_SHA) return "DSA/DH/AES/16/SHA1";
if(suite == DHE_DSS_AES256_SHA) return "DSA/DH/AES/32/SHA1";
return "";
}
}
/**
* CipherSuite Constructor
*/
CipherSuite::CipherSuite(u16bit suite_code)
{
if(suite_code == 0)
return;
std::string suite_string = lookup_ciphersuite(suite_code);
if(suite_string == "")
throw Invalid_Argument("Unknown ciphersuite: " +
to_string(suite_code));
std::vector<std::string> suite_info = split_on(suite_string, '/');
if(suite_info[0] == "RSA") sig_algo = RSA_SIG;
else if(suite_info[0] == "DSA") sig_algo = DSA_SIG;
else if(suite_info[0] == "NONE") sig_algo = NO_SIG;
else
throw TLS_Exception(INTERNAL_ERROR,
"CipherSuite: Unknown sig type " + suite_info[0]);
if(suite_info[1] == "DH") kex_algo = DH_KEX;
else if(suite_info[1] == "RSA") kex_algo = RSA_KEX;
else if(suite_info[1] == "NONE") kex_algo = NO_KEX;
else
throw TLS_Exception(INTERNAL_ERROR,
"CipherSuite: Unknown kex type " + suite_info[1]);
cipher = suite_info[2];
cipher_key_length = to_u32bit(suite_info[3]);
mac = suite_info[4];
}
}
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