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https://codeberg.org/anoncontributorxmr/monero.git
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bulletproofs: speed up the latest changes a bit
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@ -92,21 +92,6 @@ static bool is_reduced(const rct::key &scalar)
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return scalar == reduced;
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}
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//addKeys3acc_p3
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//aAbB += a*A + b*B where a, b are scalars, A, B are curve points
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//A and B must be input after applying "precomp"
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static void addKeys3acc_p3(ge_p3 *aAbB, const key &a, const ge_dsmp A, const key &b, const ge_dsmp B)
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{
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ge_p3 rv;
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ge_p1p1 p1;
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ge_p2 p2;
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ge_double_scalarmult_precomp_vartime2_p3(&rv, a.bytes, A, b.bytes, B);
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ge_cached cached;
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ge_p3_to_cached(&cached, aAbB);
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ge_add(&p1, &rv, &cached);
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ge_p1p1_to_p3(aAbB, &p1);
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}
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static void addKeys_acc_p3(ge_p3 *acc_p3, const rct::key &a, const rct::key &point)
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{
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ge_p3 p3;
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@ -119,6 +104,28 @@ static void addKeys_acc_p3(ge_p3 *acc_p3, const rct::key &a, const rct::key &poi
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ge_p1p1_to_p3(acc_p3, &p1);
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}
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static void add_acc_p3(ge_p3 *acc_p3, const rct::key &point)
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{
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ge_p3 p3;
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CHECK_AND_ASSERT_THROW_MES(ge_frombytes_vartime(&p3, point.bytes) == 0, "ge_frombytes_vartime failed");
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ge_cached cached;
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ge_p3_to_cached(&cached, &p3);
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ge_p1p1 p1;
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ge_add(&p1, acc_p3, &cached);
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ge_p1p1_to_p3(acc_p3, &p1);
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}
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static void sub_acc_p3(ge_p3 *acc_p3, const rct::key &point)
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{
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ge_p3 p3;
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CHECK_AND_ASSERT_THROW_MES(ge_frombytes_vartime(&p3, point.bytes) == 0, "ge_frombytes_vartime failed");
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ge_cached cached;
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ge_p3_to_cached(&cached, &p3);
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ge_p1p1 p1;
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ge_sub(&p1, acc_p3, &cached);
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ge_p1p1_to_p3(acc_p3, &p1);
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}
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static rct::key scalarmultKey(const ge_p3 &P, const rct::key &a)
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{
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ge_p2 R;
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@ -1087,9 +1094,7 @@ bool bulletproof_VERIFY(const std::vector<const Bulletproof*> &proofs)
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sc_mul(tmp.bytes, zpow[j+2].bytes, EIGHT.bytes);
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multiexp_data.emplace_back(tmp, proof.V[j]);
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}
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rct::key temp = multiexp(multiexp_data, false);
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rct::addKeys(Y2, Y2, rct::scalarmultKey(temp, weight));
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rct::addKeys(Y2, Y2, rct::scalarmultKey(multiexp(multiexp_data, false), weight));
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rct::key weight8;
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sc_mul(weight8.bytes, weight.bytes, EIGHT.bytes);
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sc_mul(tmp.bytes, x.bytes, weight8.bytes);
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@ -1103,7 +1108,7 @@ bool bulletproof_VERIFY(const std::vector<const Bulletproof*> &proofs)
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PERF_TIMER_START_BP(VERIFY_line_62);
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// PAPER LINE 62
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sc_mul(tmp.bytes, x.bytes, EIGHT.bytes);
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rct::addKeys(Z0, Z0, rct::scalarmultKey(rct::addKeys(rct::scalarmultKey(proof.A, EIGHT), rct::scalarmultKey(proof.S, tmp)), weight));
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rct::addKeys(Z0, Z0, rct::scalarmultKey(rct::addKeys(rct::scalarmult8(proof.A), rct::scalarmultKey(proof.S, tmp)), weight));
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PERF_TIMER_STOP(VERIFY_line_62);
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// Compute the number of rounds for the inner product
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@ -1202,23 +1207,22 @@ bool bulletproof_VERIFY(const std::vector<const Bulletproof*> &proofs)
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// now check all proofs at once
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PERF_TIMER_START_BP(VERIFY_step2_check);
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rct::key check1 = rct::identity();
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rct::addKeys(check1, check1, rct::scalarmultBase(y0));
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rct::addKeys(check1, check1, rct::scalarmultH(y1));
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rct::subKeys(check1, check1, Y2);
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rct::subKeys(check1, check1, Y3);
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rct::subKeys(check1, check1, Y4);
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if (!(check1 == rct::identity()))
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ge_p3 check1;
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ge_scalarmult_base(&check1, y0.bytes);
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addKeys_acc_p3(&check1, y1, rct::H);
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sub_acc_p3(&check1, Y2);
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sub_acc_p3(&check1, Y3);
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sub_acc_p3(&check1, Y4);
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if (!ge_p3_is_point_at_infinity(&check1))
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{
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MERROR("Verification failure at step 1");
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return false;
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}
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rct::key check2 = rct::identity();
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rct::addKeys(check2, check2, Z0);
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ge_p3 check2;
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sc_sub(tmp.bytes, rct::zero().bytes, z1.bytes);
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rct::addKeys(check2, check2, rct::scalarmultBase(tmp));
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rct::addKeys(check2, check2, Z2);
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rct::addKeys(check2, check2, rct::scalarmultH(z3));
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ge_double_scalarmult_base_vartime_p3(&check2, z3.bytes, &ge_p3_H, tmp.bytes);
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add_acc_p3(&check2, Z0);
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add_acc_p3(&check2, Z2);
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std::vector<MultiexpData> multiexp_data;
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multiexp_data.reserve(2 * maxMN);
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@ -1229,10 +1233,10 @@ bool bulletproof_VERIFY(const std::vector<const Bulletproof*> &proofs)
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sc_sub(tmp.bytes, rct::zero().bytes, z5[i].bytes);
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multiexp_data.emplace_back(tmp, Hi_p3[i]);
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}
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rct::addKeys(check2, check2, multiexp(multiexp_data, true));
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add_acc_p3(&check2, multiexp(multiexp_data, true));
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PERF_TIMER_STOP(VERIFY_step2_check);
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if (!(check2 == rct::identity()))
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if (!ge_p3_is_point_at_infinity(&check2))
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{
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MERROR("Verification failure at step 2");
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return false;
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@ -211,6 +211,20 @@ namespace rct {
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return aP;
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}
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//Computes 8P
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key scalarmult8(const key & P) {
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ge_p3 p3;
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CHECK_AND_ASSERT_THROW_MES_L1(ge_frombytes_vartime(&p3, P.bytes) == 0, "ge_frombytes_vartime failed at "+boost::lexical_cast<std::string>(__LINE__));
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ge_p2 p2;
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ge_p3_to_p2(&p2, &p3);
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ge_p1p1 p1;
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ge_mul8(&p1, &p2);
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ge_p1p1_to_p2(&p2, &p1);
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rct::key res;
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ge_tobytes(res.bytes, &p2);
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return res;
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}
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//Computes aL where L is the curve order
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bool isInMainSubgroup(const key & a) {
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ge_p3 p3;
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@ -122,6 +122,8 @@ namespace rct {
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key scalarmultKey(const key &P, const key &a);
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//Computes aH where H= toPoint(cn_fast_hash(G)), G the basepoint
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key scalarmultH(const key & a);
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// multiplies a point by 8
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key scalarmult8(const key & P);
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// checks a is in the main subgroup (ie, not a small one)
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bool isInMainSubgroup(const key & a);
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@ -768,7 +768,7 @@ namespace rct {
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#endif
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for (i = 0; i < outamounts.size(); ++i)
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{
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rv.outPk[i].mask = rct::scalarmultKey(C[i], EIGHT);
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rv.outPk[i].mask = rct::scalarmult8(C[i]);
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outSk[i].mask = masks[i];
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}
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}
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@ -788,7 +788,7 @@ namespace rct {
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#endif
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for (i = 0; i < batch_size; ++i)
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{
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rv.outPk[i + amounts_proved].mask = rct::scalarmultKey(C[i], EIGHT);
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rv.outPk[i + amounts_proved].mask = rct::scalarmult8(C[i]);
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outSk[i + amounts_proved].mask = masks[i];
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}
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amounts_proved += batch_size;
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@ -45,6 +45,8 @@ enum test_op
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op_addKeys,
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op_scalarmultBase,
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op_scalarmultKey,
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op_scalarmultH,
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op_scalarmult8,
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op_ge_double_scalarmult_base_vartime,
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op_ge_double_scalarmult_precomp_vartime,
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op_ge_double_scalarmult_precomp_vartime2,
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@ -97,6 +99,8 @@ public:
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case op_addKeys: rct::addKeys(key, point0, point1); break;
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case op_scalarmultBase: rct::scalarmultBase(scalar0); break;
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case op_scalarmultKey: rct::scalarmultKey(point0, scalar0); break;
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case op_scalarmultH: rct::scalarmultH(scalar0); break;
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case op_scalarmult8: rct::scalarmult8(point0); break;
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case op_ge_double_scalarmult_base_vartime: ge_double_scalarmult_base_vartime(&tmp_p2, scalar0.bytes, &p3_0, scalar1.bytes); break;
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case op_ge_double_scalarmult_precomp_vartime: ge_double_scalarmult_precomp_vartime(&tmp_p2, scalar0.bytes, &p3_0, scalar1.bytes, precomp0); break;
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case op_ge_double_scalarmult_precomp_vartime2: ge_double_scalarmult_precomp_vartime2(&tmp_p2, scalar0.bytes, precomp0, scalar1.bytes, precomp1); break;
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@ -247,6 +247,8 @@ int main(int argc, char** argv)
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TEST_PERFORMANCE1(filter, p, test_crypto_ops, op_addKeys);
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TEST_PERFORMANCE1(filter, p, test_crypto_ops, op_scalarmultBase);
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TEST_PERFORMANCE1(filter, p, test_crypto_ops, op_scalarmultKey);
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TEST_PERFORMANCE1(filter, p, test_crypto_ops, op_scalarmultH);
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TEST_PERFORMANCE1(filter, p, test_crypto_ops, op_scalarmult8);
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TEST_PERFORMANCE1(filter, p, test_crypto_ops, op_ge_double_scalarmult_base_vartime);
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TEST_PERFORMANCE1(filter, p, test_crypto_ops, op_ge_double_scalarmult_precomp_vartime);
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TEST_PERFORMANCE1(filter, p, test_crypto_ops, op_ge_double_scalarmult_precomp_vartime2);
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@ -1093,6 +1093,13 @@ TEST(ringct, H)
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ASSERT_EQ(memcmp(&p3, &ge_p3_H, sizeof(ge_p3)), 0);
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}
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TEST(ringct, mul8)
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{
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ASSERT_EQ(rct::scalarmult8(rct::identity()), rct::identity());
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ASSERT_EQ(rct::scalarmult8(rct::H), rct::scalarmultKey(rct::H, rct::EIGHT));
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ASSERT_EQ(rct::scalarmultKey(rct::scalarmultKey(rct::H, rct::INV_EIGHT), rct::EIGHT), rct::H);
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}
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TEST(ringct, aggregated)
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{
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static const size_t N_PROOFS = 16;
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