// Copyright (c) 2016, Monero Research Labs // // Author: Shen Noether // // All rights reserved. // // 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. // // 3. Neither the name of the copyright holder nor the names of its contributors may be // used to endorse or promote products derived from this software without specific // prior written permission. // // 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. #pragma once //#define DBG #ifndef RCTSIGS_H #define RCTSIGS_H #include #include #include #include "crypto/generic-ops.h" extern "C" { #include "crypto/random.h" #include "crypto/keccak.h" } #include "crypto/crypto.h" #include "rctTypes.h" #include "rctOps.h" //Define this flag when debugging to get additional info on the console #ifdef DBG #define DP(x) dp(x) #else #define DP(x) #endif namespace hw { class device; } namespace rct { boroSig genBorromean(const key64 x, const key64 P1, const key64 P2, const bits indices); bool verifyBorromean(const boroSig &bb, const key64 P1, const key64 P2); //Multilayered Spontaneous Anonymous Group Signatures (MLSAG signatures) //These are aka MG signatutes in earlier drafts of the ring ct paper // c.f. https://eprint.iacr.org/2015/1098 section 2. // Gen creates a signature which proves that for some column in the keymatrix "pk" // the signer knows a secret key for each row in that column // Ver verifies that the MG sig was created correctly mgSig MLSAG_Gen(const key &message, const keyM & pk, const keyV & xx, const unsigned int index, size_t dsRows, hw::device &hwdev); bool MLSAG_Ver(const key &message, const keyM &pk, const mgSig &sig, size_t dsRows); clsag CLSAG_Gen(const key &message, const keyV & P, const key & p, const keyV & C, const key & z, const keyV & C_nonzero, const key & C_offset, const unsigned int l, hw::device &hwdev); clsag CLSAG_Gen(const key &message, const keyV & P, const key & p, const keyV & C, const key & z, const keyV & C_nonzero, const key & C_offset, const unsigned int l); clsag proveRctCLSAGSimple(const key &, const ctkeyV &, const ctkey &, const key &, const key &, unsigned int, hw::device &); bool verRctCLSAGSimple(const key &, const clsag &, const ctkeyV &, const key &); //proveRange and verRange //proveRange gives C, and mask such that \sumCi = C // c.f. https://eprint.iacr.org/2015/1098 section 5.1 // and Ci is a commitment to either 0 or 2^i, i=0,...,63 // thus this proves that "amount" is in [0, 2^64] // mask is a such that C = aG + bH, and b = amount //verRange verifies that \sum Ci = C and that each Ci is a commitment to 0 or 2^i rangeSig proveRange(key & C, key & mask, const xmr_amount & amount); bool verRange(const key & C, const rangeSig & as); //Ring-ct MG sigs //Prove: // c.f. https://eprint.iacr.org/2015/1098 section 4. definition 10. // This does the MG sig on the "dest" part of the given key matrix, and // the last row is the sum of input commitments from that column - sum output commitments // this shows that sum inputs = sum outputs //Ver: // verifies the above sig is created corretly mgSig proveRctMG(const ctkeyM & pubs, const ctkeyV & inSk, const keyV &outMasks, const ctkeyV & outPk, unsigned int index, const key &txnFee, const key &message, hw::device &hwdev); mgSig proveRctMGSimple(const key & message, const ctkeyV & pubs, const ctkey & inSk, const key &a , const key &Cout, unsigned int index, hw::device &hwdev); bool verRctMG(const mgSig &mg, const ctkeyM & pubs, const ctkeyV & outPk, const key &txnFee, const key &message); bool verRctMGSimple(const key &message, const mgSig &mg, const ctkeyV & pubs, const key & C); //These functions get keys from blockchain //replace these when connecting blockchain //getKeyFromBlockchain grabs a key from the blockchain at "reference_index" to mix with //populateFromBlockchain creates a keymatrix with "mixin" columns and one of the columns is inPk // the return value are the key matrix, and the index where inPk was put (random). void getKeyFromBlockchain(ctkey & a, size_t reference_index); std::tuple populateFromBlockchain(ctkeyV inPk, int mixin); //RingCT protocol //genRct: // creates an rctSig with all data necessary to verify the rangeProofs and that the signer owns one of the // columns that are claimed as inputs, and that the sum of inputs = sum of outputs. // Also contains masked "amount" and "mask" so the receiver can see how much they received //verRct: // verifies that all signatures (rangeProogs, MG sig, sum inputs = outputs) are correct //decodeRct: (c.f. https://eprint.iacr.org/2015/1098 section 5.1.1) // uses the attached ecdh info to find the amounts represented by each output commitment // must know the destination private key to find the correct amount, else will return a random number rctSig genRct(const key &message, const ctkeyV & inSk, const keyV & destinations, const std::vector & amounts, const ctkeyM &mixRing, const keyV &amount_keys, unsigned int index, ctkeyV &outSk, const RCTConfig &rct_config, hw::device &hwdev); rctSig genRct(const key &message, const ctkeyV & inSk, const ctkeyV & inPk, const keyV & destinations, const std::vector & amounts, const keyV &amount_keys, const int mixin, const RCTConfig &rct_config, hw::device &hwdev); rctSig genRctSimple(const key & message, const ctkeyV & inSk, const ctkeyV & inPk, const keyV & destinations, const std::vector & inamounts, const std::vector & outamounts, const keyV &amount_keys, xmr_amount txnFee, unsigned int mixin, const RCTConfig &rct_config, hw::device &hwdev); rctSig genRctSimple(const key & message, const ctkeyV & inSk, const keyV & destinations, const std::vector & inamounts, const std::vector & outamounts, xmr_amount txnFee, const ctkeyM & mixRing, const keyV &amount_keys, const std::vector & index, ctkeyV &outSk, const RCTConfig &rct_config, hw::device &hwdev); rctSig genRctSimple_old(const key & message, const ctkeyV & inSk, const ctkeyV & inPk, const keyV & destinations, const std::vector & inamounts, const std::vector & outamounts, const keyV &amount_keys, xmr_amount txnFee, unsigned int mixin, const RCTConfig &rct_config, hw::device &hwdev); rctSig genRctSimple_old(const key & message, const ctkeyV & inSk, const keyV & destinations, const std::vector & inamounts, const std::vector & outamounts, xmr_amount txnFee, const ctkeyM & mixRing, const keyV &amount_keys, const std::vector & index, ctkeyV &outSk, const RCTConfig &rct_config, hw::device &hwdev); bool verRct(const rctSig & rv, bool semantics); static inline bool verRct(const rctSig & rv) { return verRct(rv, true) && verRct(rv, false); } bool verRctSemanticsSimple(const rctSig & rv); bool verRctSemanticsSimple(const std::vector & rv); bool verRctNonSemanticsSimple(const rctSig & rv); static inline bool verRctSimple(const rctSig & rv) { return verRctSemanticsSimple(rv) && verRctNonSemanticsSimple(rv); } xmr_amount decodeRct(const rctSig & rv, const key & sk, unsigned int i, key & mask, hw::device &hwdev); xmr_amount decodeRct(const rctSig & rv, const key & sk, unsigned int i, hw::device &hwdev); xmr_amount decodeRctSimple(const rctSig & rv, const key & sk, unsigned int i, key & mask, hw::device &hwdev); xmr_amount decodeRctSimple(const rctSig & rv, const key & sk, unsigned int i, hw::device &hwdev); key get_pre_mlsag_hash(const rctSig &rv, hw::device &hwdev); } #endif /* RCTSIGS_H */