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/*
* (C) 2013,2015 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include <botan/aead.h>
#include <botan/scan_name.h>
#include <sstream>
#if defined(BOTAN_HAS_BLOCK_CIPHER)
#include <botan/block_cipher.h>
#endif
#if defined(BOTAN_HAS_AEAD_CCM)
#include <botan/ccm.h>
#endif
#if defined(BOTAN_HAS_AEAD_CHACHA20_POLY1305)
#include <botan/chacha20poly1305.h>
#endif
#if defined(BOTAN_HAS_AEAD_EAX)
#include <botan/eax.h>
#endif
#if defined(BOTAN_HAS_AEAD_GCM)
#include <botan/gcm.h>
#endif
#if defined(BOTAN_HAS_AEAD_OCB)
#include <botan/ocb.h>
#endif
#if defined(BOTAN_HAS_AEAD_SIV)
#include <botan/siv.h>
#endif
namespace Botan {
AEAD_Mode* get_aead(const std::string& algo, Cipher_Dir dir)
{
#if defined(BOTAN_HAS_AEAD_CHACHA20_POLY1305)
if(algo == "ChaCha20Poly1305")
{
if(dir == ENCRYPTION)
return new ChaCha20Poly1305_Encryption;
else
return new ChaCha20Poly1305_Decryption;
}
#endif
if(algo.find('/') != std::string::npos)
{
const std::vector<std::string> algo_parts = split_on(algo, '/');
const std::string cipher_name = algo_parts[0];
const std::vector<std::string> mode_info = parse_algorithm_name(algo_parts[1]);
if(mode_info.empty())
return nullptr;
std::ostringstream alg_args;
alg_args << '(' << cipher_name;
for(size_t i = 1; i < mode_info.size(); ++i)
alg_args << ',' << mode_info[i];
for(size_t i = 2; i < algo_parts.size(); ++i)
alg_args << ',' << algo_parts[i];
alg_args << ')';
const std::string mode_name = mode_info[0] + alg_args.str();
return get_aead(mode_name, dir);
}
#if defined(BOTAN_HAS_BLOCK_CIPHER)
SCAN_Name req(algo);
if(req.arg_count() == 0)
{
return nullptr;
}
std::unique_ptr<BlockCipher> bc(BlockCipher::create(req.arg(0)));
if(!bc)
{
return nullptr;
}
#if defined(BOTAN_HAS_AEAD_CCM)
if(req.algo_name() == "CCM")
{
size_t tag_len = req.arg_as_integer(1, 16);
size_t L_len = req.arg_as_integer(2, 3);
if(dir == ENCRYPTION)
return new CCM_Encryption(bc.release(), tag_len, L_len);
else
return new CCM_Decryption(bc.release(), tag_len, L_len);
}
#endif
#if defined(BOTAN_HAS_AEAD_GCM)
if(req.algo_name() == "GCM")
{
size_t tag_len = req.arg_as_integer(1, 16);
if(dir == ENCRYPTION)
return new GCM_Encryption(bc.release(), tag_len);
else
return new GCM_Decryption(bc.release(), tag_len);
}
#endif
#if defined(BOTAN_HAS_AEAD_OCB)
if(req.algo_name() == "OCB")
{
size_t tag_len = req.arg_as_integer(1, 16);
if(dir == ENCRYPTION)
return new OCB_Encryption(bc.release(), tag_len);
else
return new OCB_Decryption(bc.release(), tag_len);
}
#endif
#if defined(BOTAN_HAS_AEAD_EAX)
if(req.algo_name() == "EAX")
{
size_t tag_len = req.arg_as_integer(1, bc->block_size());
if(dir == ENCRYPTION)
return new EAX_Encryption(bc.release(), tag_len);
else
return new EAX_Decryption(bc.release(), tag_len);
}
#endif
#if defined(BOTAN_HAS_AEAD_SIV)
if(req.algo_name() == "SIV")
{
if(dir == ENCRYPTION)
return new SIV_Encryption(bc.release());
else
return new SIV_Decryption(bc.release());
}
#endif
#endif
return nullptr;
}
}
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