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Merge pull request #10108

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ede4d7f RingCT crypto: 6x faster zero commit (j-berman)

ACKs: UkoeHB, jeffro256
This commit is contained in:
tobtoht
2026-07-03 11:57:32 +00:00
parent dac3103348 ede4d7faef
commit 23372d12f5
16 changed files with 146 additions and 33 deletions
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src/ringct/rctOps.cpp
+43 -4
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@@ -29,6 +29,7 @@
// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include <boost/lexical_cast.hpp>
#include "crypto/generators.h"
#include "misc_log_ex.h"
extern "C" {
#include "rctCryptoOps.h"
@@ -220,6 +221,33 @@ static const zero_commitment zero_commitments[] = {
{ (uint64_t)10000000000000000000ull, {{0x65, 0x8d, 0x1, 0x37, 0x6d, 0x18, 0x63, 0xe7, 0x7b, 0x9, 0x6f, 0x98, 0xe6, 0xe5, 0x13, 0xc2, 0x4, 0x10, 0xf5, 0xc7, 0xfb, 0x18, 0xa6, 0xe5, 0x9a, 0x52, 0x66, 0x84, 0x5c, 0xd9, 0xb1, 0xe3}} },
};
static constexpr std::size_t H_TABLE_SIZE = 64;
const std::vector<ge_cached>& H_TABLE()
{
struct static_h_table
{
std::vector<ge_cached> h_table;
static_h_table()
: h_table()
{
h_table.resize(H_TABLE_SIZE);
ge_p3_to_cached(&h_table.at(0), &ge_p3_H);
ge_p3 H_bit_p3 = ge_p3_H;
for (std::size_t i = 1; i < H_TABLE_SIZE; ++i)
{
ge_p1p1 H_bit_p1p1;
ge_p3_dbl(&H_bit_p1p1, &H_bit_p3);
ge_p1p1_to_p3(&H_bit_p3, &H_bit_p1p1);
ge_p3_to_cached(&h_table.at(i), &H_bit_p3);
}
}
};
static const static_h_table out;
return out.h_table;
}
namespace rct {
//Various key initialization functions
@@ -322,7 +350,7 @@ namespace rct {
return make_tuple(sk, pk);
}
key zeroCommit(xmr_amount amount) {
key zeroCommitVartime(xmr_amount amount) {
const zero_commitment *begin = zero_commitments;
const zero_commitment *end = zero_commitments + sizeof(zero_commitments) / sizeof(zero_commitments[0]);
const zero_commitment value{amount, rct::zero()};
@@ -331,9 +359,20 @@ namespace rct {
{
return it->commitment;
}
key am = d2h(amount);
key bH = scalarmultH(am);
return addKeys(G, bH);
ge_p3 res_ge_p3 = get_G_p3();
static_assert(sizeof(xmr_amount) * 8 == H_TABLE_SIZE, "unexpected size of h table");
for (size_t i = 0; i < H_TABLE_SIZE; ++i)
{
if (amount & (xmr_amount(1) << i))
{
ge_p1p1 p1p1;
ge_add(&p1p1, &res_ge_p3, &H_TABLE()[i]);
ge_p1p1_to_p3(&res_ge_p3, &p1p1);
}
}
rct::key res;
ge_p3_tobytes(res.bytes, &res_ge_p3);
return res;
}
key commit(xmr_amount amount, const key &mask) {