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/*
* (C) 2009 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#include <fstream>
#include <iostream>
#include <sstream>
#include <boost/regex.hpp>
#include <botan/botan.h>
#include <botan/eax.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;
}
void 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)
{
/*
printf("EAX(algo=%s key=%s nonce=%s header=%s tag=%s pt=%s ct=%s)\n",
algo.c_str(), key_str.c_str(), nonce_str.c_str(), header_str.c_str(), tag_str.c_str(),
plaintext_str.c_str(), ciphertext.c_str());
*/
SymmetricKey key(key_str);
InitializationVector iv(nonce_str);
EAX_Encryption* enc;
Pipe pipe(new Hex_Decoder,
enc = new EAX_Encryption(get_block_cipher(algo)),
new Hex_Encoder);
enc->set_key(key);
enc->set_iv(iv);
OctetString header(header_str);
enc->set_header(header.begin(), header.length());
pipe.start_msg();
pipe.write(plaintext_str);
pipe.end_msg();
std::string out = pipe.read_all_as_string();
if(out != ciphertext + tag_str)
{
printf("BAD enc %s '%s' != '%s%s'\n", algo.c_str(),
out.c_str(), ciphertext.c_str(), tag_str.c_str());
}
else
printf("OK enc %s\n", algo.c_str());
try
{
EAX_Decryption* dec;
Pipe pipe2(new Hex_Decoder,
dec = new EAX_Decryption(get_block_cipher(algo)),
new Hex_Encoder);
dec->set_key(key);
dec->set_iv(iv);
dec->set_header(header.begin(), header.length());
pipe2.start_msg();
pipe2.write(ciphertext);
pipe2.write(tag_str);
pipe2.end_msg();
std::string out2 = pipe2.read_all_as_string();
if(out2 != plaintext_str)
{
printf("BAD decrypt %s '%s'\n", algo.c_str(), out2.c_str());
}
else
printf("OK decrypt %s\n", algo.c_str());
}
catch(std::exception& e)
{
printf("%s\n", e.what());
}
}
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;
}
void run_tests(std::istream& in)
{
std::string algo;
std::string key;
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);
eax_test(algo, key, nonce, header, tag,
plaintext, ciphertext);
key = rep(tag, key.size()); // repeat as needed
}
}
}
}
}
int main()
{
std::ifstream in("eax_vecs.txt");
Botan::LibraryInitializer init;
if(!in)
{
std::cerr << "Couldn't read input file\n";
return 1;
}
run_tests(in);
}
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