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/*
* (C) 2014,2015 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include "tests.h"
#if defined(BOTAN_HAS_AEAD_OCB)
#include <botan/ocb.h>
#include <botan/loadstor.h>
#endif
namespace Botan_Tests {
namespace {
#if defined(BOTAN_HAS_AEAD_OCB)
class OCB_Long_KAT_Tests : public Text_Based_Test
{
public:
OCB_Long_KAT_Tests() : Text_Based_Test("ocb_long.vec",
{"Keylen", "Taglen", "Output"}) {}
Test::Result run_one_test(const std::string&, const VarMap& vars)
{
const size_t keylen = get_req_sz(vars, "Keylen");
const size_t taglen = get_req_sz(vars, "Taglen");
const std::vector<byte> expected = get_req_bin(vars, "Output");
// Test from RFC 7253 Appendix A
const std::string algo = "AES-" + std::to_string(keylen);
Test::Result result("OCB long");
std::unique_ptr<Botan::BlockCipher> aes(Botan::BlockCipher::create(algo));
if(!aes)
{
result.note_missing(algo);
return result;
}
Botan::OCB_Encryption enc(aes->clone(), taglen / 8);
Botan::OCB_Decryption dec(aes->clone(), taglen / 8);
std::vector<byte> key(keylen/8);
key[keylen/8-1] = taglen;
enc.set_key(key);
dec.set_key(key);
const std::vector<byte> empty;
std::vector<byte> N(12);
std::vector<byte> C;
for(size_t i = 0; i != 128; ++i)
{
const std::vector<byte> S(i);
Botan::store_be(static_cast<uint32_t>(3*i+1), &N[8]);
ocb_encrypt(result, C, enc, dec, N, S, S);
Botan::store_be(static_cast<uint32_t>(3*i+2), &N[8]);
ocb_encrypt(result, C, enc, dec, N, S, empty);
Botan::store_be(static_cast<uint32_t>(3*i+3), &N[8]);
ocb_encrypt(result, C, enc, dec, N, empty, S);
}
Botan::store_be(static_cast<uint32_t>(385), &N[8]);
std::vector<byte> final_result;
ocb_encrypt(result, final_result, enc, dec, N, empty, C);
result.test_eq("correct value", final_result, expected);
return result;
}
private:
void ocb_encrypt(Test::Result& result,
std::vector<byte>& output_to,
Botan::OCB_Encryption& enc,
Botan::OCB_Decryption& dec,
const std::vector<byte>& nonce,
const std::vector<byte>& pt,
const std::vector<byte>& ad)
{
enc.set_associated_data(ad.data(), ad.size());
enc.start(nonce.data(), nonce.size());
Botan::secure_vector<byte> buf(pt.begin(), pt.end());
enc.finish(buf, 0);
output_to.insert(output_to.end(), buf.begin(), buf.end());
try
{
dec.set_associated_data(ad.data(), ad.size());
dec.start(nonce.data(), nonce.size());
dec.finish(buf, 0);
result.test_eq("OCB round tripped", buf, pt);
}
catch(std::exception& e)
{
result.test_failure("OCB round trip error", e.what());
}
}
};
BOTAN_REGISTER_TEST("ocb_long", OCB_Long_KAT_Tests);
#endif
}
}
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