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190 lines
8.5 KiB
C++
190 lines
8.5 KiB
C++
//#define DBG
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// 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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#ifndef RCTOPS_H
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#define RCTOPS_H
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#include <cstddef>
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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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#include "rctCryptoOps.h"
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}
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#include "crypto/crypto.h"
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#include "rctTypes.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 rct {
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//Various key initialization functions
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static const key Z = { {0x00, 0x00, 0x00,0x00 , 0x00, 0x00, 0x00,0x00 , 0x00, 0x00, 0x00,0x00 , 0x00, 0x00, 0x00,0x00 , 0x00, 0x00, 0x00,0x00 , 0x00, 0x00, 0x00,0x00 , 0x00, 0x00, 0x00,0x00 , 0x00, 0x00, 0x00,0x00 } };
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static const key I = { {0x01, 0x00, 0x00,0x00 , 0x00, 0x00, 0x00,0x00 , 0x00, 0x00, 0x00,0x00 , 0x00, 0x00, 0x00,0x00 , 0x00, 0x00, 0x00,0x00 , 0x00, 0x00, 0x00,0x00 , 0x00, 0x00, 0x00,0x00 , 0x00, 0x00, 0x00,0x00 } };
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static const key L = { {0xed, 0xd3, 0xf5, 0x5c, 0x1a, 0x63, 0x12, 0x58, 0xd6, 0x9c, 0xf7, 0xa2, 0xde, 0xf9, 0xde, 0x14, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10 } };
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static const key G = { {0x58, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66 } };
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static const key EIGHT = { {0x08, 0x00, 0x00,0x00 , 0x00, 0x00, 0x00,0x00 , 0x00, 0x00, 0x00,0x00 , 0x00, 0x00, 0x00,0x00 , 0x00, 0x00, 0x00,0x00 , 0x00, 0x00, 0x00,0x00 , 0x00, 0x00, 0x00,0x00 , 0x00, 0x00, 0x00,0x00 } };
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static const key INV_EIGHT = { { 0x79, 0x2f, 0xdc, 0xe2, 0x29, 0xe5, 0x06, 0x61, 0xd0, 0xda, 0x1c, 0x7d, 0xb3, 0x9d, 0xd3, 0x07, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x06 } };
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//Creates a zero scalar
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inline key zero() { return Z; }
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inline void zero(key &z) { memset(&z, 0, 32); }
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//Creates a zero elliptic curve point
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inline key identity() { return I; }
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inline void identity(key &Id) { memcpy(&Id, &I, 32); }
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//Creates a key equal to the curve order
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inline key curveOrder() { return L; }
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inline void curveOrder(key &l) { l = L; }
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//copies a scalar or point
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inline void copy(key &AA, const key &A) { memcpy(&AA, &A, 32); }
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inline key copy(const key & A) { key AA; memcpy(&AA, &A, 32); return AA; }
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//initializes a key matrix;
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//first parameter is rows,
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//second is columns
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keyM keyMInit(size_t rows, size_t cols);
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//Various key generation functions
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bool toPointCheckOrder(ge_p3 *P, const unsigned char *data);
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//generates a random scalar which can be used as a secret key or mask
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key skGen();
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void skGen(key &);
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//generates a vector of secret keys of size "int"
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keyV skvGen(size_t rows );
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//generates a random curve point (for testing)
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key pkGen();
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//generates a random secret and corresponding public key
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void skpkGen(key &sk, key &pk);
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std::tuple<key, key> skpkGen();
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//generates a <secret , public> / Pedersen commitment to the amount
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std::tuple<ctkey, ctkey> ctskpkGen(xmr_amount amount);
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//generates C =aG + bH from b, a is random
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void genC(key & C, const key & a, xmr_amount amount);
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//this one is mainly for testing, can take arbitrary amounts..
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std::tuple<ctkey, ctkey> ctskpkGen(const key &bH);
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// make a pedersen commitment with given key
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key commit(xmr_amount amount, const key &mask);
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// make a pedersen commitment with zero key
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key zeroCommit(xmr_amount amount);
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//generates a random uint long long
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xmr_amount randXmrAmount(xmr_amount upperlimit);
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//Scalar multiplications of curve points
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//does a * G where a is a scalar and G is the curve basepoint
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void scalarmultBase(key & aG, const key &a);
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key scalarmultBase(const key & a);
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//does a * P where a is a scalar and P is an arbitrary point
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void scalarmultKey(key &aP, const key &P, const key &a);
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key scalarmultKey(const key &P, const key &a);
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//Computes aH where H= toPoint(cn_fast_hash(G)), G the basepoint
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key scalarmultH(const key & a);
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// multiplies a point by 8
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key scalarmult8(const key & P);
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// checks a is in the main subgroup (ie, not a small one)
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bool isInMainSubgroup(const key & a);
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//Curve addition / subtractions
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//for curve points: AB = A + B
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void addKeys(key &AB, const key &A, const key &B);
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rct::key addKeys(const key &A, const key &B);
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rct::key addKeys(const keyV &A);
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//aGB = aG + B where a is a scalar, G is the basepoint, and B is a point
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void addKeys1(key &aGB, const key &a, const key & B);
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//aGbB = aG + bB where a, b are scalars, G is the basepoint and B is a point
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void addKeys2(key &aGbB, const key &a, const key &b, const key &B);
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//Does some precomputation to make addKeys3 more efficient
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// input B a curve point and output a ge_dsmp which has precomputation applied
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void precomp(ge_dsmp rv, const key &B);
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//aAbB = a*A + b*B where a, b are scalars, A, B are curve points
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//B must be input after applying "precomp"
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void addKeys3(key &aAbB, const key &a, const key &A, const key &b, const ge_dsmp B);
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void addKeys3(key &aAbB, const key &a, const ge_dsmp A, const key &b, const ge_dsmp B);
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//AB = A - B where A, B are curve points
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void subKeys(key &AB, const key &A, const key &B);
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//checks if A, B are equal as curve points
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bool equalKeys(const key & A, const key & B);
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//Hashing - cn_fast_hash
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//be careful these are also in crypto namespace
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//cn_fast_hash for arbitrary l multiples of 32 bytes
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void cn_fast_hash(key &hash, const void * data, const size_t l);
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void hash_to_scalar(key &hash, const void * data, const size_t l);
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//cn_fast_hash for a 32 byte key
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void cn_fast_hash(key &hash, const key &in);
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void hash_to_scalar(key &hash, const key &in);
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//cn_fast_hash for a 32 byte key
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key cn_fast_hash(const key &in);
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key hash_to_scalar(const key &in);
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//for mg sigs
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key cn_fast_hash128(const void * in);
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key hash_to_scalar128(const void * in);
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key cn_fast_hash(const ctkeyV &PC);
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key hash_to_scalar(const ctkeyV &PC);
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//for mg sigs
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key cn_fast_hash(const keyV &keys);
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key hash_to_scalar(const keyV &keys);
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//for ANSL
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key cn_fast_hash(const key64 keys);
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key hash_to_scalar(const key64 keys);
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//returns hashToPoint as described in https://github.com/ShenNoether/ge_fromfe_writeup
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key hashToPointSimple(const key &in);
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key hashToPoint(const key &in);
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void hashToPoint(key &out, const key &in);
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//sums a vector of curve points (for scalars use sc_add)
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void sumKeys(key & Csum, const key &Cis);
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//Elliptic Curve Diffie Helman: encodes and decodes the amount b and mask a
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// where C= aG + bH
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key genCommitmentMask(const key &sk);
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void ecdhEncode(ecdhTuple & unmasked, const key & sharedSec, bool v2);
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void ecdhDecode(ecdhTuple & masked, const key & sharedSec, bool v2);
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}
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#endif /* RCTOPS_H */
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