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Текущая директория: /usr/lib/node_modules/bitgo/node_modules/@bitgo/sdk-lib-mpc/dist/src
Просмотр файла: schnorrProof.js
"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.createSchnorrProof = createSchnorrProof;
exports.verifySchnorrProof = verifySchnorrProof;
/**
* Implementation of Schnorr Non-interactive Zero-Knowledge Proof.
* @see {@link https://datatracker.ietf.org/doc/rfc8235/}
*/
const crypto_1 = require("crypto");
const util_1 = require("./util");
/**
* Create a Schnorr Proof of knowledge of the discrete log of an Elliptic-curve point.
* @param A The curve point.
* @param a The discrete log of the curve point.
* @param curve The elliptic curve.
* @param additionalCtx Additional contextual information to associate with the proof.
* @returns The created proof.
*/
function createSchnorrProof(A, a, curve, additionalCtx = Buffer.from('')) {
const v = curve.scalarRandom();
const V = curve.basePointMult(v);
const c = nonInteractiveChallenge(V, A, curve, additionalCtx);
const r = curve.scalarSub(v, curve.scalarMult(a, c));
return {
vPoint: V,
r: r,
};
}
/**
* Calculate challenge for NIZK schnorr proof using Fiat-Shamir transform.
*
* @param V The point/public value corresponding to the random scalar value v chosen by the prover.
* @param A The point to be proved.
* @param curve The elliptic curve.
* @param additionalCtx Additional contextual information to associate with the proof.
* @returns The calculated challenge.
*/
function nonInteractiveChallenge(V, A, curve, additionalCtx) {
const G = curve.basePointMult(BigInt(1));
const hash = (0, crypto_1.createHash)('sha256');
hash.update((0, util_1.bigIntToBufferBE)(G, 32));
hash.update((0, util_1.bigIntToBufferBE)(V, 32));
hash.update((0, util_1.bigIntToBufferBE)(A, 32));
hash.update(additionalCtx);
return (0, util_1.bigIntFromBufferBE)(hash.digest());
}
/**
* Verify a Schnorr Proof of knowledge of the discrete log of an Elliptic-curve point.
* @param A The curve point.
* @param proof The schnorr proof.
* @param curve The elliptic curve.
* @param additionalCtx Additional contextual information that is supposed to associate with the proof.
* @returns True if the proof checks out.
*/
function verifySchnorrProof(A, proof, curve, additionalCtx = Buffer.from('')) {
const c = nonInteractiveChallenge(proof.vPoint, A, curve, additionalCtx);
const rG = curve.basePointMult(proof.r);
const cA = curve.pointMultiply(A, curve.scalarReduce(c));
return proof.vPoint === curve.pointAdd(rG, cA);
}
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Выполнить 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