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140 lines
8 KiB
C++
140 lines
8 KiB
C++
// Copyright (c) 2016, Monero Research Labs
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//
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// Author: Shen Noether <shen.noether@gmx.com>
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//
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without modification, are
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// permitted provided that the following conditions are met:
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//
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// 1. Redistributions of source code must retain the above copyright notice, this list of
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// conditions and the following disclaimer.
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//
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// 2. Redistributions in binary form must reproduce the above copyright notice, this list
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// of conditions and the following disclaimer in the documentation and/or other
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// materials provided with the distribution.
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//
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// 3. Neither the name of the copyright holder nor the names of its contributors may be
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// used to endorse or promote products derived from this software without specific
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// prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
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// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
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// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#pragma once
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//#define DBG
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#ifndef RCTSIGS_H
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#define RCTSIGS_H
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#include <cstddef>
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#include <vector>
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#include <tuple>
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#include "crypto/generic-ops.h"
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extern "C" {
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#include "crypto/random.h"
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#include "crypto/keccak.h"
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}
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#include "crypto/crypto.h"
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#include "rctTypes.h"
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#include "rctOps.h"
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//Define this flag when debugging to get additional info on the console
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#ifdef DBG
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#define DP(x) dp(x)
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#else
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#define DP(x)
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#endif
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namespace hw {
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class device;
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}
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namespace rct {
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boroSig genBorromean(const key64 x, const key64 P1, const key64 P2, const bits indices);
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bool verifyBorromean(const boroSig &bb, const key64 P1, const key64 P2);
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//Multilayered Spontaneous Anonymous Group Signatures (MLSAG signatures)
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//These are aka MG signatutes in earlier drafts of the ring ct paper
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// c.f. https://eprint.iacr.org/2015/1098 section 2.
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// Gen creates a signature which proves that for some column in the keymatrix "pk"
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// the signer knows a secret key for each row in that column
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// Ver verifies that the MG sig was created correctly
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mgSig MLSAG_Gen(const key &message, const keyM & pk, const keyV & xx, const multisig_kLRki *kLRki, key *mscout, const unsigned int index, size_t dsRows, hw::device &hwdev);
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bool MLSAG_Ver(const key &message, const keyM &pk, const mgSig &sig, size_t dsRows);
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//mgSig MLSAG_Gen_Old(const keyM & pk, const keyV & xx, const int index);
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//proveRange and verRange
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//proveRange gives C, and mask such that \sumCi = C
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// c.f. https://eprint.iacr.org/2015/1098 section 5.1
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// and Ci is a commitment to either 0 or 2^i, i=0,...,63
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// thus this proves that "amount" is in [0, 2^64]
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// mask is a such that C = aG + bH, and b = amount
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//verRange verifies that \sum Ci = C and that each Ci is a commitment to 0 or 2^i
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rangeSig proveRange(key & C, key & mask, const xmr_amount & amount);
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bool verRange(const key & C, const rangeSig & as);
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//Ring-ct MG sigs
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//Prove:
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// c.f. https://eprint.iacr.org/2015/1098 section 4. definition 10.
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// This does the MG sig on the "dest" part of the given key matrix, and
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// the last row is the sum of input commitments from that column - sum output commitments
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// this shows that sum inputs = sum outputs
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//Ver:
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// verifies the above sig is created corretly
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mgSig proveRctMG(const ctkeyM & pubs, const ctkeyV & inSk, const keyV &outMasks, const ctkeyV & outPk, const multisig_kLRki *kLRki, key *mscout, unsigned int index, key txnFee, const key &message, hw::device &hwdev);
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mgSig proveRctMGSimple(const key & message, const ctkeyV & pubs, const ctkey & inSk, const key &a , const key &Cout, const multisig_kLRki *kLRki, key *mscout, unsigned int index, hw::device &hwdev);
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bool verRctMG(const mgSig &mg, const ctkeyM & pubs, const ctkeyV & outPk, key txnFee, const key &message);
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bool verRctMGSimple(const key &message, const mgSig &mg, const ctkeyV & pubs, const key & C);
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//These functions get keys from blockchain
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//replace these when connecting blockchain
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//getKeyFromBlockchain grabs a key from the blockchain at "reference_index" to mix with
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//populateFromBlockchain creates a keymatrix with "mixin" columns and one of the columns is inPk
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// the return value are the key matrix, and the index where inPk was put (random).
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void getKeyFromBlockchain(ctkey & a, size_t reference_index);
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std::tuple<ctkeyM, xmr_amount> populateFromBlockchain(ctkeyV inPk, int mixin);
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//RingCT protocol
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//genRct:
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// creates an rctSig with all data necessary to verify the rangeProofs and that the signer owns one of the
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// columns that are claimed as inputs, and that the sum of inputs = sum of outputs.
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// Also contains masked "amount" and "mask" so the receiver can see how much they received
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//verRct:
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// verifies that all signatures (rangeProogs, MG sig, sum inputs = outputs) are correct
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//decodeRct: (c.f. https://eprint.iacr.org/2015/1098 section 5.1.1)
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// uses the attached ecdh info to find the amounts represented by each output commitment
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// must know the destination private key to find the correct amount, else will return a random number
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rctSig genRct(const key &message, const ctkeyV & inSk, const keyV & destinations, const std::vector<xmr_amount> & amounts, const ctkeyM &mixRing, const keyV &amount_keys, const multisig_kLRki *kLRki, multisig_out *msout, unsigned int index, ctkeyV &outSk, hw::device &hwdev);
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rctSig genRct(const key &message, const ctkeyV & inSk, const ctkeyV & inPk, const keyV & destinations, const std::vector<xmr_amount> & amounts, const keyV &amount_keys, const multisig_kLRki *kLRki, multisig_out *msout, const int mixin, hw::device &hwdev);
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rctSig genRctSimple(const key & message, const ctkeyV & inSk, const ctkeyV & inPk, const keyV & destinations, const std::vector<xmr_amount> & inamounts, const std::vector<xmr_amount> & outamounts, const keyV &amount_keys, const std::vector<multisig_kLRki> *kLRki, multisig_out *msout, xmr_amount txnFee, unsigned int mixin, hw::device &hwdev);
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rctSig genRctSimple(const key & message, const ctkeyV & inSk, const keyV & destinations, const std::vector<xmr_amount> & inamounts, const std::vector<xmr_amount> & outamounts, xmr_amount txnFee, const ctkeyM & mixRing, const keyV &amount_keys, const std::vector<multisig_kLRki> *kLRki, multisig_out *msout, const std::vector<unsigned int> & index, ctkeyV &outSk, RangeProofType range_proof_type, hw::device &hwdev);
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bool verRct(const rctSig & rv, bool semantics);
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static inline bool verRct(const rctSig & rv) { return verRct(rv, true) && verRct(rv, false); }
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bool verRctSemanticsSimple(const rctSig & rv);
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bool verRctSemanticsSimple(const std::vector<const rctSig*> & rv);
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bool verRctNonSemanticsSimple(const rctSig & rv);
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static inline bool verRctSimple(const rctSig & rv) { return verRctSemanticsSimple(rv) && verRctNonSemanticsSimple(rv); }
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xmr_amount decodeRct(const rctSig & rv, const key & sk, unsigned int i, key & mask, hw::device &hwdev);
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xmr_amount decodeRct(const rctSig & rv, const key & sk, unsigned int i, hw::device &hwdev);
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xmr_amount decodeRctSimple(const rctSig & rv, const key & sk, unsigned int i, key & mask, hw::device &hwdev);
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xmr_amount decodeRctSimple(const rctSig & rv, const key & sk, unsigned int i, hw::device &hwdev);
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bool signMultisig(rctSig &rv, const std::vector<unsigned int> &indices, const keyV &k, const multisig_out &msout, const key &secret_key);
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}
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#endif /* RCTSIGS_H */
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