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/*
* Interface for AEAD modes
* (C) 2013 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#include <botan/aead.h>
#include <botan/libstate.h>
#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
namespace Botan {
AEAD_Mode* get_aead(const std::string& algo_spec, Cipher_Dir direction)
{
Algorithm_Factory& af = global_state().algorithm_factory();
const std::vector<std::string> algo_parts = split_on(algo_spec, '/');
if(algo_parts.empty())
throw Invalid_Algorithm_Name(algo_spec);
if(algo_parts.size() < 2)
return nullptr;
const std::string cipher_name = algo_parts[0];
const std::string mode_name = algo_parts[1];
const size_t tag_size = 16; // default for all current AEAD
const BlockCipher* cipher = af.prototype_block_cipher(cipher_name);
if(!cipher)
return nullptr;
#if defined(BOTAN_HAS_AEAD_EAX)
if(mode_name == "EAX")
{
if(direction == ENCRYPTION)
return new EAX_Encryption(cipher->clone(), tag_size);
else
return new EAX_Decryption(cipher->clone(), tag_size);
}
#endif
#if defined(BOTAN_HAS_AEAD_GCM)
if(mode_name == "GCM")
{
if(direction == ENCRYPTION)
return new GCM_Encryption(cipher->clone(), tag_size);
else
return new GCM_Decryption(cipher->clone(), tag_size);
}
#endif
#if defined(BOTAN_HAS_AEAD_OCB)
if(mode_name == "OCB")
{
if(direction == ENCRYPTION)
return new OCB_Encryption(cipher->clone(), tag_size);
else
return new OCB_Decryption(cipher->clone(), tag_size);
}
#endif
return nullptr;
}
}
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