EvalMap.h

/* Copyright (C) 2012-2020 IBM Corp.
 * This program is Licensed under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at
 *   http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License. See accompanying LICENSE file.
 */
#ifndef HELIB_EVALMAP_H
#define HELIB_EVALMAP_H
 
#include <helib/EncryptedArray.h>
#include <helib/matmul.h>
 
namespace helib {
 
 
class EvalMap
{
private:
  const EncryptedArray& ea;
  bool invert;   // apply transformation in inverse order?
  long nfactors; // how many factors of m
  std::unique_ptr<BlockMatMul1DExec> mat1;        // one block matrix
  NTL::Vec<std::unique_ptr<MatMul1DExec>> matvec; // regular matrices
 
public:
  EvalMap(const EncryptedArray& _ea,
          bool minimal,
          const NTL::Vec<long>& mvec,
          bool _invert,
          bool build_cache,
          bool normal_basis = true);
 
  // the normal_basis parameter indicates that we want the
  // normal basis transformation when invert == true.
  // On by default, off for testing
 
  void upgrade();
  void apply(Ctxt& ctxt) const;
};
 
 
class ThinEvalMap
{
private:
  const EncryptedArray& ea;
  bool invert;   // apply transformation in inverse order?
  long nfactors; // how many factors of m
  NTL::Vec<std::unique_ptr<MatMulExecBase>> matvec; // regular matrices
 
public:
  ThinEvalMap(const EncryptedArray& _ea,
              bool minimal,
              const NTL::Vec<long>& mvec,
              bool _invert,
              bool build_cache);
 
  void upgrade();
  void apply(Ctxt& ctxt) const;
};
 
} // namespace helib
 
#endif // ifndef HELIB_EVALMAP_H