bool generate_key_image_helper(const AccountKeys& ack, const PublicKey& tx_public_key, size_t real_output_index, KeyPair& in_ephemeral, KeyImage& ki) {
KeyDerivation recv_derivation;
bool r = generate_key_derivation(tx_public_key, ack.viewSecretKey, recv_derivation);
assert(r && "key image helper: failed to generate_key_derivation");
if (!r) {
return false;
}
r = derive_public_key(recv_derivation, real_output_index, ack.address.spendPublicKey, in_ephemeral.publicKey);
assert(r && "key image helper: failed to derive_public_key");
if (!r) {
return false;
}
derive_secret_key(recv_derivation, real_output_index, ack.spendSecretKey, in_ephemeral.secretKey);
generate_key_image(in_ephemeral.publicKey, in_ephemeral.secretKey, ki);
return true;
}
void crypto_ops::generate_ring_signature(const hash &prefix_hash, const key_image &image,
const public_key *const *pubs, size_t pubs_count,
const secret_key &sec, size_t sec_index,
signature *sig) {
lock_guard<mutex> lock(random_lock);
size_t i;
ge_p3 image_unp;
ge_dsmp image_pre;
ec_scalar sum, k, h;
rs_comm *const buf = reinterpret_cast<rs_comm *>(alloca(rs_comm_size(pubs_count)));
assert(sec_index < pubs_count);
#if !defined(NDEBUG)
{
ge_p3 t;
public_key t2;
key_image t3;
assert(sc_check(&sec) == 0);
ge_scalarmult_base(&t, &sec);
ge_p3_tobytes(&t2, &t);
assert(*pubs[sec_index] == t2);
generate_key_image(*pubs[sec_index], sec, t3);
assert(image == t3);
for (i = 0; i < pubs_count; i++) {
assert(check_key(*pubs[i]));
}
}
#endif
if (ge_frombytes_vartime(&image_unp, &image) != 0) {
abort();
}
ge_dsm_precomp(image_pre, &image_unp);
sc_0(&sum);
buf->h = prefix_hash;
for (i = 0; i < pubs_count; i++) {
ge_p2 tmp2;
ge_p3 tmp3;
if (i == sec_index) {
random_scalar(k);
ge_scalarmult_base(&tmp3, &k);
ge_p3_tobytes(&buf->ab[i].a, &tmp3);
hash_to_ec(*pubs[i], tmp3);
ge_scalarmult(&tmp2, &k, &tmp3);
ge_tobytes(&buf->ab[i].b, &tmp2);
} else {
random_scalar(sig[i].c);
random_scalar(sig[i].r);
if (ge_frombytes_vartime(&tmp3, &*pubs[i]) != 0) {
abort();
}
ge_double_scalarmult_base_vartime(&tmp2, &sig[i].c, &tmp3, &sig[i].r);
ge_tobytes(&buf->ab[i].a, &tmp2);
hash_to_ec(*pubs[i], tmp3);
ge_double_scalarmult_precomp_vartime(&tmp2, &sig[i].r, &tmp3, &sig[i].c, image_pre);
ge_tobytes(&buf->ab[i].b, &tmp2);
sc_add(&sum, &sum, &sig[i].c);
}
}
hash_to_scalar(buf, rs_comm_size(pubs_count), h);
sc_sub(&sig[sec_index].c, &h, &sum);
sc_mulsub(&sig[sec_index].r, &sig[sec_index].c, &sec, &k);
}
}
static crypto::key_image generate_key_image()
{
return crypto::rand<crypto::key_image>();
}
static crypto::public_key generate_output()
{
return crypto::rand<crypto::public_key>();
}
static const crypto::chacha_key KEY_1 = generate_chacha_key();
static const crypto::chacha_key KEY_2 = generate_chacha_key();
static const crypto::key_image KEY_IMAGE_1 = generate_key_image();
static const crypto::public_key OUTPUT_1 = generate_output();
static const crypto::public_key OUTPUT_2 = generate_output();
class RingDB: public tools::ringdb
{
public:
RingDB(const char *genesis = ""): tools::ringdb(make_filename(), genesis) { }
~RingDB() { close(); boost::filesystem::remove_all(filename); free(filename); }
private:
std::string make_filename()
{
boost::filesystem::path path = tools::get_default_data_dir();
path /= "fake";
#if defined(__MINGW32__) || defined(__MINGW__)
