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/*
* AES Key Wrap (RFC 3394)
* (C) 2011 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include <botan/rfc3394.h>
#include <botan/nist_keywrap.h>
#include <botan/block_cipher.h>
namespace Botan {
secure_vector<uint8_t> rfc3394_keywrap(const secure_vector<uint8_t>& key,
const SymmetricKey& kek)
{
if(kek.size() != 16 && kek.size() != 24 && kek.size() != 32)
throw Invalid_Argument("Bad KEK length " + std::to_string(kek.size()) + " for NIST key wrap");
const std::string cipher_name = "AES-" + std::to_string(8*kek.size());
std::unique_ptr<BlockCipher> aes(BlockCipher::create_or_throw(cipher_name));
aes->set_key(kek);
std::vector<uint8_t> wrapped = nist_key_wrap(key.data(), key.size(), *aes);
return secure_vector<uint8_t>(wrapped.begin(), wrapped.end());
}
secure_vector<uint8_t> rfc3394_keyunwrap(const secure_vector<uint8_t>& key,
const SymmetricKey& kek)
{
if(key.size() < 16 || key.size() % 8 != 0)
throw Invalid_Argument("Bad input key size for NIST key unwrap");
if(kek.size() != 16 && kek.size() != 24 && kek.size() != 32)
throw Invalid_Argument("Bad KEK length " + std::to_string(kek.size()) + " for NIST key unwrap");
const std::string cipher_name = "AES-" + std::to_string(8*kek.size());
std::unique_ptr<BlockCipher> aes(BlockCipher::create_or_throw(cipher_name));
aes->set_key(kek);
return nist_key_unwrap(key.data(), key.size(), *aes);
}
}
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