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/*
* (C) 2009 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#include "tests.h"
#include <fstream>
#include <iostream>
#include <sstream>
#include <boost/regex.hpp>
#include <botan/eax.h>
#include <botan/hex.h>
#include <botan/lookup.h>
using namespace Botan;
namespace {
unsigned from_string(const std::string& s)
{
std::istringstream stream(s);
unsigned n;
stream >> n;
return n;
}
std::string seq(unsigned n)
{
std::string s;
for(unsigned i = 0; i != n; ++i)
{
unsigned char b = (i & 0xFF);
const char bin2hex[] = { '0', '1', '2', '3', '4', '5', '6', '7',
'8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };
s += bin2hex[(b >> 4)];
s += bin2hex[(b & 0x0f)];
}
return s;
}
size_t eax_test(const std::string& algo,
const std::string& key_str,
const std::string& nonce_str,
const std::string& header_str,
const std::string& tag_str,
const std::string& plaintext_str,
const std::string& ciphertext)
{
size_t fail = 0;
try
{
EAX_Encryption enc(get_block_cipher(algo));
EAX_Decryption dec(get_block_cipher(algo));
enc.set_key(hex_decode(key_str));
dec.set_key(hex_decode(key_str));
enc.set_associated_data_vec(hex_decode(header_str));
dec.set_associated_data_vec(hex_decode(header_str));
secure_vector<byte> text = hex_decode_locked(plaintext_str);
enc.start_vec(hex_decode(nonce_str));
enc.finish(text);
const std::string produced = hex_encode(text);
if(produced != ciphertext + tag_str)
{
std::cout << "EAX " << algo << " " << produced << " != expected " << ciphertext << tag_str << "\n";
++fail;
}
text.clear();
text = hex_decode_locked(ciphertext);
text += hex_decode_locked(tag_str);
dec.start_vec(hex_decode(nonce_str));
dec.finish(text);
const std::string decrypted = hex_encode(text);
if(decrypted != plaintext_str)
{
std::cout << "EAX " << algo << " " << decrypted << " != expected " << plaintext_str << "\n";
++fail;
}
}
catch(std::exception& e)
{
std::cout << "Exception during EAX test " << e.what() << "\n";
++fail;
}
return fail;
}
std::pair<std::string, int> translate_algo(const std::string& in)
{
if(in == "aes (16 byte key)")
return std::make_pair("AES-128", 16);
if(in == "blowfish (8 byte key)")
return std::make_pair("Blowfish", 8);
if(in == "rc2 (8 byte key)")
return std::make_pair("RC2", 8);
if(in == "rc5 (8 byte key)")
return std::make_pair("RC5", 8);
if(in == "rc6 (16 byte key)")
return std::make_pair("RC6", 16);
if(in == "safer-sk128 (16 byte key)")
return std::make_pair("SAFER-SK(10)", 16);
if(in == "twofish (16 byte key)")
return std::make_pair("Twofish", 16);
if(in == "des (8 byte key)")
return std::make_pair("DES", 8);
if(in == "3des (24 byte key)")
return std::make_pair("TripleDES", 24);
// These 3 are disabled due to differences in base algorithm.
#if 0
// XTEA: LTC uses little endian, Botan (and Crypto++) use big-endian
// I swapped to LE in XTEA and the vectors did match
if(in == "xtea (16 byte key)")
return std::make_pair("XTEA", 16);
// Skipjack: LTC uses big-endian, Botan (and Crypto++) use
// little-endian I am not sure if that was the full difference
// though, was unable to replicate LTC's EAX vectors with Skipjack
if(in == "skipjack (10 byte key)")
return std::make_pair("Skipjack", 10);
// Noekeon: uses direct keying instead of indirect
if(in == "noekeon (16 byte key)")
return std::make_pair("Noekeon", 16);
#endif
return std::make_pair("", 0);
}
std::string rep(const std::string& s_in, unsigned n)
{
std::string s_out;
for(unsigned i = 0; i != n; ++i)
s_out += s_in[i % s_in.size()];
return s_out;
}
size_t eax_tests(std::istream& in)
{
std::string algo;
std::string key;
size_t fails = 0;
size_t tests = 0;
while(in.good())
{
std::string line;
std::getline(in, line);
if(line == "")
continue;
if(line.size() > 5 && line.substr(0, 4) == "EAX-")
{
std::pair<std::string, int> name_and_keylen =
translate_algo(line.substr(4));
algo = name_and_keylen.first;
key = seq(name_and_keylen.second);
}
else if(algo != "")
{
boost::regex vec_regex("^([ 0-9]{3}): (.*), (.*)$");
boost::smatch what;
if(boost::regex_match(line, what, vec_regex, boost::match_extra))
{
unsigned n = from_string(what[1]);
std::string ciphertext = what[2];
std::string tag = what[3];
std::string plaintext = seq(n);
std::string header = seq(n);
std::string nonce = seq(n);
tests += 1;
fails += eax_test(algo, key, nonce, header, tag,
plaintext, ciphertext);
key = rep(tag, key.size()); // repeat as needed
}
}
}
test_report("EAX", tests, fails);
return fails;
}
}
size_t test_eax()
{
// Uses a set of tests created for libtomcrypt
std::ifstream in(CHECKS_DIR "/eax.vec");
return eax_tests(in);
}
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