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// Copyright (c) 2012-2013 The Bitcoin Core developers
// Distributed under the MIT/X11 software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
//
// Unit tests for canonical signatures
//
#include "data/sig_noncanonical.json.h"
#include "data/sig_canonical.json.h"
#include "random.h"
#include "script.h"
#include "util.h"
#include <boost/foreach.hpp>
#include <boost/test/unit_test.hpp>
#include "json/json_spirit_writer_template.h"
#include <openssl/ecdsa.h>
using namespace std;
using namespace json_spirit;
// In script_tests.cpp
extern Array read_json(const std::string& jsondata);
BOOST_AUTO_TEST_SUITE(canonical_tests)
// OpenSSL-based test for canonical signature (without test for hashtype byte)
bool static IsCanonicalSignature_OpenSSL_inner(const std::vector<unsigned char>& vchSig)
{
if (vchSig.size() == 0)
return false;
const unsigned char *input = &vchSig[0];
ECDSA_SIG *psig = NULL;
d2i_ECDSA_SIG(&psig, &input, vchSig.size());
if (psig == NULL)
return false;
unsigned char buf[256];
unsigned char *pbuf = buf;
unsigned int nLen = i2d_ECDSA_SIG(psig, NULL);
if (nLen != vchSig.size()) {
ECDSA_SIG_free(psig);
return false;
}
nLen = i2d_ECDSA_SIG(psig, &pbuf);
ECDSA_SIG_free(psig);
return (memcmp(&vchSig[0], &buf[0], nLen) == 0);
}
// OpenSSL-based test for canonical signature
bool static IsCanonicalSignature_OpenSSL(const std::vector<unsigned char> &vchSignature) {
if (vchSignature.size() < 1)
return false;
if (vchSignature.size() > 127)
return false;
if (vchSignature[vchSignature.size() - 1] & 0x7C)
return false;
std::vector<unsigned char> vchSig(vchSignature);
vchSig.pop_back();
if (!IsCanonicalSignature_OpenSSL_inner(vchSig))
return false;
return true;
}
BOOST_AUTO_TEST_CASE(script_canon)
{
Array tests = read_json(std::string(json_tests::sig_canonical, json_tests::sig_canonical + sizeof(json_tests::sig_canonical)));
BOOST_FOREACH(Value &tv, tests) {
string test = tv.get_str();
if (IsHex(test)) {
std::vector<unsigned char> sig = ParseHex(test);
BOOST_CHECK_MESSAGE(IsCanonicalSignature(sig, SCRIPT_VERIFY_STRICTENC), test);
BOOST_CHECK_MESSAGE(IsCanonicalSignature_OpenSSL(sig), test);
}
}
}
BOOST_AUTO_TEST_CASE(script_noncanon)
{
Array tests = read_json(std::string(json_tests::sig_noncanonical, json_tests::sig_noncanonical + sizeof(json_tests::sig_noncanonical)));
BOOST_FOREACH(Value &tv, tests) {
string test = tv.get_str();
if (IsHex(test)) {
std::vector<unsigned char> sig = ParseHex(test);
BOOST_CHECK_MESSAGE(!IsCanonicalSignature(sig, SCRIPT_VERIFY_STRICTENC), test);
BOOST_CHECK_MESSAGE(!IsCanonicalSignature_OpenSSL(sig), test);
}
}
}
BOOST_AUTO_TEST_CASE(script_signstrict)
{
for (int i=0; i<100; i++) {
CKey key;
key.MakeNewKey(i & 1);
std::vector<unsigned char> sig;
uint256 hash = GetRandHash();
BOOST_CHECK(key.Sign(hash, sig)); // Generate a random signature.
BOOST_CHECK(key.GetPubKey().Verify(hash, sig)); // Check it.
sig.push_back(0x01); // Append a sighash type.
BOOST_CHECK(IsCanonicalSignature(sig, SCRIPT_VERIFY_STRICTENC | SCRIPT_VERIFY_LOW_S));
BOOST_CHECK(IsCanonicalSignature_OpenSSL(sig));
}
}
BOOST_AUTO_TEST_SUITE_END()
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