Issue908

README.md

@@ -12,6 +12,8 @@ OpenFHE also supports hybrid vectorized schemes, with the goal of enabling the F
   * Switching between CKKS and FHEW/TFHE to evaluate non-smooth functions, e.g., comparison, using (scalar) FHEW/TFHE functional bootstrapping
   * Switching between RLWE (a scheme equivalent to the coefficient-encoded additive BFV scheme) and CKKS to evaluate arbitrary lookup tables over vectors of integers, e.g., modular reduction, comparison or S-box, using vectorized functional bootstrapping implemented in CKKS
 
+OpenFHE also supports partial schemes, called schemelets, such as RLWE which is equivalent to the coefficient-encoded additive BFV scheme. In OpenFHE, the RLWE schemelet is the starting point for the vectorized functional bootstrapping capability, which allows the evaluation of arbitrary lookup tables over vectors of integers, e.g., modular reduction, comparison or Sbox, using CKKS in an intermediate step.
+
 OpenFHE also includes the following multiparty extensions of FHE:
   * Threshold FHE for BGV, BFV, and CKKS schemes
   * Interactive bootstrapping for Threshold CKKS

benchmark/src/ckks-bootstrapping.cpp

@@ -0,0 +1,129 @@
+//==================================================================================
+// BSD 2-Clause License
+//
+// Copyright (c) 2014-2025, NJIT, Duality Technologies Inc. and other contributors
+//
+// All rights reserved.
+//
+// Author TPOC: contact@openfhe.org
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are met:
+//
+// 1. Redistributions of source code must retain the above copyright notice, this
+//    list of conditions and the following disclaimer.
+//
+// 2. Redistributions in binary form must reproduce the above copyright notice,
+//    this list of conditions and the following disclaimer in the documentation
+//    and/or other materials provided with the distribution.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//==================================================================================
+
+#include "benchmark/benchmark.h"
+#include "config_core.h"
+#include "cryptocontext.h"
+#include "gen-cryptocontext.h"
+#include "gtest/gtest.h"
+#include "scheme/ckksrns/ckksrns-fhe.h"
+#include "scheme/ckksrns/ckksrns-utils.h"
+#include "scheme/ckksrns/gen-cryptocontext-ckksrns.h"
+
+#include <vector>
+
+using namespace lbcrypto;
+
+struct boot_config {
+    uint32_t ringDim;
+    uint32_t slots;
+    uint32_t dcrtBits;
+    uint32_t firstMod;
+    uint32_t numDigits;
+    uint32_t lvlsAfter;
+    uint32_t iters;
+    std::vector<uint32_t> lvlb;
+    SecretKeyDist skdst;
+    ScalingTechnique stech;
+};
+
+// clang-format off
+[[maybe_unused]] std::vector<boot_config> boot_configs = {
+    // ringDm,   slots, dcrtBits, firstMod, numDigits, lvlsAfter, iters,   lvlb,                skdst,                stech
+    { 1 << 16, 1 << 15,       54,       60,        15,         9,     1, {3, 3},      UNIFORM_TERNARY,         FLEXIBLEAUTO},
+    { 1 << 16, 1 << 15,       50,       57,        11,         9,     2, {3, 3},      UNIFORM_TERNARY,         FLEXIBLEAUTO},
+    { 1 << 16, 1 << 15,       50,       57,        16,        10,     2, {3, 3},      UNIFORM_TERNARY,         FLEXIBLEAUTO},
+    { 1 << 16, 1 << 15,       52,       57,        10,         8,     2, {3, 3},      UNIFORM_TERNARY,          FIXEDMANUAL},
+    { 1 << 16, 1 << 15,       52,       57,        16,         9,     2, {3, 3},      UNIFORM_TERNARY,          FIXEDMANUAL},
+    { 1 << 17, 1 << 16,       59,       60,         0,         5,     1, {4, 4},       SPARSE_TERNARY,         FLEXIBLEAUTO},
+    { 1 << 17, 1 << 16,       59,       60,         0,         5,     1, {4, 4},  SPARSE_ENCAPSULATED,         FLEXIBLEAUTO},
+    { 1 << 16,  1 << 5,       59,       60,         0,         5,     1, {1, 1},       SPARSE_TERNARY,         FLEXIBLEAUTO},
+    { 1 << 16,  1 << 5,       59,       60,         0,         5,     1, {1, 1},  SPARSE_ENCAPSULATED,         FLEXIBLEAUTO},
+    { 1 << 17,  1 << 5,       59,       60,         0,         5,     1, {1, 1},       SPARSE_TERNARY,         FLEXIBLEAUTO},
+    { 1 << 17,  1 << 5,       59,       60,         0,         5,     1, {1, 1},  SPARSE_ENCAPSULATED,         FLEXIBLEAUTO},
+    { 1 << 17, 1 << 16,       59,       60,         0,        10,     1, {4, 4},  SPARSE_ENCAPSULATED,         FLEXIBLEAUTO},
+    { 1 << 17,  1 << 5,       59,       60,         0,        10,     1, {1, 1},  SPARSE_ENCAPSULATED,         FLEXIBLEAUTO},
+    { 1 << 17, 1 << 16,       59,       60,         0,        10,     2, {4, 4},  SPARSE_ENCAPSULATED,         FLEXIBLEAUTO},
+    { 1 << 17,  1 << 5,       59,       60,         0,        10,     2, {1, 1},  SPARSE_ENCAPSULATED,         FLEXIBLEAUTO},
+    { 1 << 17, 1 << 16,       78,       96,         0,        10,     2, {4, 4},       SPARSE_TERNARY, COMPOSITESCALINGAUTO},
+};
+// clang-format on
+
+[[maybe_unused]] static void BootConfigs(benchmark::internal::Benchmark* b) {
+    for (uint32_t i = 0; i < boot_configs.size(); ++i)
+        b->ArgName("Config")->Arg(i);
+}
+
+[[maybe_unused]] static void CKKSBoot(benchmark::State& state) {
+    auto t = boot_configs[state.range(0)];
+
+    CCParams<CryptoContextCKKSRNS> parameters;
+    parameters.SetSecurityLevel(HEStd_128_classic);
+    parameters.SetRingDim(t.ringDim);
+    parameters.SetScalingModSize(t.dcrtBits);
+    parameters.SetFirstModSize(t.firstMod);
+    parameters.SetNumLargeDigits(t.numDigits);
+    parameters.SetSecretKeyDist(t.skdst);
+    parameters.SetScalingTechnique(t.stech);
+    parameters.SetKeySwitchTechnique(HYBRID);
+    uint32_t depth = t.lvlsAfter + FHECKKSRNS::GetBootstrapDepth(t.lvlb, t.skdst) + (t.iters - 1);
+    parameters.SetMultiplicativeDepth(depth);
+
+    auto cc = GenCryptoContext(parameters);
+    cc->Enable(PKE);
+    cc->Enable(KEYSWITCH);
+    cc->Enable(LEVELEDSHE);
+    cc->Enable(ADVANCEDSHE);
+    cc->Enable(FHE);
+
+    cc->EvalBootstrapSetup(t.lvlb, {0, 0}, t.slots);
+
+    auto keyPair = cc->KeyGen();
+    cc->EvalMultKeyGen(keyPair.secretKey);
+    cc->EvalBootstrapKeyGen(keyPair.secretKey, t.slots);
+
+    std::vector<double> x = {0.25, 0.5, 0.75, 1.0, 2.0, 3.0, 4.0, 5.0};
+
+    auto ptxt = cc->MakeCKKSPackedPlaintext(x, 1, depth - 1, nullptr, t.slots);
+    ptxt->SetLength(t.slots);
+
+    auto ctxt = cc->Encrypt(keyPair.publicKey, ptxt);
+
+    while (state.KeepRunning())
+        auto ctxtAfter = cc->EvalBootstrap(ctxt, t.iters);
+
+    cc->ClearEvalMultKeys();
+    cc->ClearEvalAutomorphismKeys();
+}
+
+BENCHMARK(CKKSBoot)->Unit(benchmark::kSecond)->Iterations(4)->Apply(BootConfigs);
+
+BENCHMARK_MAIN();