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https://github.com/data61/MP-SPDZ.git
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87 lines
2.6 KiB
C++
87 lines
2.6 KiB
C++
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#include "FHEOffline/Reshare.h"
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#include "FHEOffline/DistDecrypt.h"
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#include "FHE/P2Data.h"
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#include "Tools/random.h"
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#include "Math/modp.hpp"
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template<class T,class FD,class S>
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void Reshare(Plaintext<T,FD,S>& m,Ciphertext& cc,
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const Ciphertext& cm,bool NewCiphertext,
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const Player& P,EncCommitBase<T,FD,S>& EC,
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const FHE_PK& pk,const FHE_SK& share)
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{
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DistDecrypt<FD> dd(P, share, pk, m.get_field());
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Reshare(m, cc, cm, NewCiphertext, P, EC, pk, dd);
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}
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template<class T,class FD,class S>
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void Reshare(Plaintext<T,FD,S>& m,Ciphertext& cc,
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const Ciphertext& cm,bool NewCiphertext,
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const Player& P,EncCommitBase<T,FD,S>& EC,
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const FHE_PK& pk,DistDecrypt<FD>& dd)
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{
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const FHE_Params& params=pk.get_params();
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// Step 1
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Ciphertext cf(params);
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Plaintext_<FD>& f = dd.f;
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EC.next(f,cf);
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// Step 2
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// We could be resharing a level 0 ciphertext so adjust if we are
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if (cm.level()==0) { cf.Scale(m.get_field().get_prime()); }
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Ciphertext cmf(params);
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add(cmf,cf,cm);
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// Step 3
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Plaintext_<FD>& mf = dd.mf;
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dd.run(cmf, NewCiphertext);
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// Step 4
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if (P.my_num()==0)
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{ sub(m,mf,f); }
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else
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{ m=f; m.negate(); }
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// Step 5
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if (NewCiphertext)
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{ unsigned char sd[SEED_SIZE] = { 0 };
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PRNG G;
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G.SetSeed(sd);
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Random_Coins rc(params);
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rc.generate(G);
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pk.encrypt(cc,mf,rc);
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// And again
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if (cf.level()==0) { cc.Scale(m.get_field().get_prime()); }
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sub(cc,cc,cf);
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}
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}
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template void Reshare(Plaintext<gfp,FFT_Data,bigint>& m,Ciphertext& cc,
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const Ciphertext& cm,bool NewCiphertext,
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const Player& P,EncCommitBase<gfp,FFT_Data,bigint>& EC,
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const FHE_PK& pk,DistDecrypt<FFT_Data>& dd);
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template void Reshare(Plaintext<gf2n_short,P2Data,int>& m,Ciphertext& cc,
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const Ciphertext& cm,bool NewCiphertext,
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const Player& P,EncCommitBase<gf2n_short,P2Data,int>& EC,
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const FHE_PK& pk,DistDecrypt<P2Data>& dd);
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template void Reshare(Plaintext<gfp,FFT_Data,bigint>& m,Ciphertext& cc,
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const Ciphertext& cm,bool NewCiphertext,
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const Player& P,EncCommitBase<gfp,FFT_Data,bigint>& EC,
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const FHE_PK& pk,const FHE_SK& share);
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template void Reshare(Plaintext<gf2n_short,P2Data,int>& m,Ciphertext& cc,
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const Ciphertext& cm,bool NewCiphertext,
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const Player& P,EncCommitBase<gf2n_short,P2Data,int>& EC,
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const FHE_PK& pk,const FHE_SK& share);
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