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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)
#if defined(BOTAN_HAS_AES)
#include <iostream>
#include <botan/ocb.h>
#include <botan/hex.h>
#include <botan/sha2_32.h>
#include <botan/aes.h>
#include <botan/loadstor.h>
using namespace Botan;
namespace {
std::vector<byte> ocb_encrypt(OCB_Encryption& enc,
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());
secure_vector<byte> buf(pt.begin(), pt.end());
enc.finish(buf, 0);
try
{
secure_vector<byte> ct = buf;
dec.set_associated_data(ad.data(), ad.size());
dec.start(nonce.data(), nonce.size());
dec.finish(ct, 0);
if(ct != pt)
std::cout << "OCB failed to decrypt correctly" << std::endl;
}
catch(std::exception& e)
{
std::cout << "OCB round trip error - " << e.what() << std::endl;
}
return unlock(buf);
}
size_t test_ocb_long(size_t keylen, size_t taglen,
const std::string &expected)
{
// Test from RFC 7253 Appendix A
const std::string algo = "AES-" + std::to_string(keylen);
std::unique_ptr<BlockCipher> aes(BlockCipher::create(algo));
if(!aes)
throw Algorithm_Not_Found(algo);
OCB_Encryption enc(aes->clone(), taglen / 8);
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);
store_be(static_cast<u32bit>(3*i+1), &N[8]);
C += ocb_encrypt(enc, dec, N, S, S);
store_be(static_cast<u32bit>(3*i+2), &N[8]);
C += ocb_encrypt(enc, dec, N, S, empty);
store_be(static_cast<u32bit>(3*i+3), &N[8]);
C += ocb_encrypt(enc, dec, N, empty, S);
}
store_be(static_cast<u32bit>(385), &N[8]);
const std::vector<byte> cipher = ocb_encrypt(enc, dec, N, empty, C);
const std::string cipher_hex = hex_encode(cipher);
if(cipher_hex != expected)
{
std::cout << "OCB " << algo << " long test mistmatch "
<< cipher_hex << " != " << expected << std::endl;
return 1;
}
return 0;
}
}
size_t test_ocb()
{
size_t fails = 0;
fails += test_ocb_long(128, 128, "67E944D23256C5E0B6C61FA22FDF1EA2");
fails += test_ocb_long(192, 128, "F673F2C3E7174AAE7BAE986CA9F29E17");
fails += test_ocb_long(256, 128, "D90EB8E9C977C88B79DD793D7FFA161C");
fails += test_ocb_long(128, 96, "77A3D8E73589158D25D01209");
fails += test_ocb_long(192, 96, "05D56EAD2752C86BE6932C5E");
fails += test_ocb_long(256, 96, "5458359AC23B0CBA9E6330DD");
fails += test_ocb_long(128, 64, "192C9B7BD90BA06A");
fails += test_ocb_long(192, 64, "0066BC6E0EF34E24");
fails += test_ocb_long(256, 64, "7D4EA5D445501CBE");
test_report("OCB long", 9, fails);
return fails;
}
#else
UNTESTED_WARNING(ocb);
#endif // BOTAN_HAS_AES
#else
SKIP_TEST(ocb);
#endif // BOTAN_HAS_AEAD_OCB
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