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/*
* Message Authentication Code base class
* (C) 1999-2008 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include <botan/mac.h>
#include <botan/exceptn.h>
#include <botan/scan_name.h>
#include <botan/mem_ops.h>
#if defined(BOTAN_HAS_CMAC)
#include <botan/cmac.h>
#endif
#if defined(BOTAN_HAS_GMAC)
#include <botan/gmac.h>
#include <botan/block_cipher.h>
#endif
#if defined(BOTAN_HAS_HMAC)
#include <botan/hmac.h>
#include <botan/hash.h>
#endif
#if defined(BOTAN_HAS_POLY1305)
#include <botan/poly1305.h>
#endif
#if defined(BOTAN_HAS_SIPHASH)
#include <botan/siphash.h>
#endif
#if defined(BOTAN_HAS_ANSI_X919_MAC)
#include <botan/x919_mac.h>
#endif
namespace Botan {
std::unique_ptr<MessageAuthenticationCode>
MessageAuthenticationCode::create(const std::string& algo_spec,
const std::string& provider)
{
const SCAN_Name req(algo_spec);
#if defined(BOTAN_HAS_GMAC)
if(req.algo_name() == "GMAC" && req.arg_count() == 1)
{
if(provider.empty() || provider == "base")
{
if(auto bc = BlockCipher::create(req.arg(0)))
return std::unique_ptr<MessageAuthenticationCode>(new GMAC(bc.release()));
}
}
#endif
#if defined(BOTAN_HAS_HMAC)
if(req.algo_name() == "HMAC" && req.arg_count() == 1)
{
// TODO OpenSSL
if(provider.empty() || provider == "base")
{
if(auto h = HashFunction::create(req.arg(0)))
return std::unique_ptr<MessageAuthenticationCode>(new HMAC(h.release()));
}
}
#endif
#if defined(BOTAN_HAS_POLY1305)
if(req.algo_name() == "Poly1305" && req.arg_count() == 0)
{
if(provider.empty() || provider == "base")
return std::unique_ptr<MessageAuthenticationCode>(new Poly1305);
}
#endif
#if defined(BOTAN_HAS_SIPHASH)
if(req.algo_name() == "SipHash")
{
if(provider.empty() || provider == "base")
{
return std::unique_ptr<MessageAuthenticationCode>(
new SipHash(req.arg_as_integer(0, 2), req.arg_as_integer(1, 4)));
}
}
#endif
#if defined(BOTAN_HAS_CMAC)
if((req.algo_name() == "CMAC" || req.algo_name() == "OMAC") && req.arg_count() == 1)
{
// TODO: OpenSSL CMAC
if(provider.empty() || provider == "base")
{
if(auto bc = BlockCipher::create(req.arg(0)))
return std::unique_ptr<MessageAuthenticationCode>(new CMAC(bc.release()));
}
}
#endif
#if defined(BOTAN_HAS_ANSI_X919_MAC)
if(req.algo_name() == "X9.19-MAC")
{
if(provider.empty() || provider == "base")
{
return std::unique_ptr<MessageAuthenticationCode>(new ANSI_X919_MAC);
}
}
#endif
BOTAN_UNUSED(req);
BOTAN_UNUSED(provider);
return nullptr;
}
std::vector<std::string>
MessageAuthenticationCode::providers(const std::string& algo_spec)
{
return probe_providers_of<MessageAuthenticationCode>(algo_spec, {"base", "openssl"});
}
//static
std::unique_ptr<MessageAuthenticationCode>
MessageAuthenticationCode::create_or_throw(const std::string& algo,
const std::string& provider)
{
if(auto mac = MessageAuthenticationCode::create(algo, provider))
{
return mac;
}
throw Lookup_Error("MAC", algo, provider);
}
void MessageAuthenticationCode::start_msg(const uint8_t nonce[], size_t nonce_len)
{
BOTAN_UNUSED(nonce);
if(nonce_len > 0)
throw Invalid_IV_Length(name(), nonce_len);
}
/*
* Default (deterministic) MAC verification operation
*/
bool MessageAuthenticationCode::verify_mac(const uint8_t mac[], size_t length)
{
secure_vector<uint8_t> our_mac = final();
if(our_mac.size() != length)
return false;
return constant_time_compare(our_mac.data(), mac, length);
}
}
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