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Просмотр файла: eddsa.js
"use strict";
var __importDefault = (this && this.__importDefault) || function (mod) {
return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
/**
* Module provides functions for MPC using threshold signature scheme (TSS). It contains
* functions for key generation and message signing with EdDSA.
*
*
* ======================
* EdDSA Key Generation
* ======================
* 1. Each signer generates their own key share, which involves a private u-share and a public y-share.
* 2. Signers distribute their y-share to other signers.
* 3. After exchanging y-shares the next phase is to combine key shares. Each signer combines their u-share
* with the y-shares received from other signers in order to generate a p-share for themselves. We
* also save j-shares for other signers.
* 4. At this point the players do not distribute any shares and the first phase of the
* signing protocol is complete.
*
* ======================
* EdDSA Signing
* ======================
* 1. The parties from key generation decide they want to sign something. They begin the signing protocol
* by generating shares of an ephemeral key.
*
* a) Each signer uses his p-share and the j-shares stored for other players to generate his signing share.
* b) This results in each signer having a private x-share and public r-shares.
*
* 2. Signers distribute their r-shares to other signers.
* 3. After exchanging r-shares, each signer signs their share of the ephemeral key using their private
* x-share with the r-shares from other signers.
* 4. This results in each signer having a public g-share which they send to the other signers.
* 5. After the signers broadcast their g-shares, the final signature can be re-constructed independently.
*/
const crypto_1 = require("crypto");
const curves_1 = require("../../curves");
const shamir_1 = __importDefault(require("../../shamir"));
const util_1 = require("../../util");
const assert_1 = __importDefault(require("assert"));
// 2^256
const base = BigInt('0x010000000000000000000000000000000000000000000000000000000000000000');
class Eddsa {
static async initialize(hdTree) {
if (!Eddsa.initialized) {
await curves_1.Ed25519Curve.initialize();
Eddsa.initialized = true;
}
return new Eddsa(hdTree);
}
constructor(hdTree) {
this.hdTree = hdTree;
}
keyShare(index, threshold, numShares, seed) {
if (!(index > 0 && index <= numShares)) {
throw new Error('Invalid KeyShare config');
}
if (seed && seed.length !== 64) {
throw new Error('Seed must have length 64');
}
const seedchain = seed ?? (0, crypto_1.randomBytes)(64);
const actualSeed = seedchain.slice(0, 32);
const chaincode = seedchain.slice(32);
const h = (0, crypto_1.createHash)('sha512').update(actualSeed).digest();
const u = (0, util_1.clamp)((0, util_1.bigIntFromBufferLE)(h.slice(0, 32)));
const y = Eddsa.curve.basePointMult(u);
const { shares: split_u, v } = Eddsa.shamir.split(u, threshold, numShares);
const P_i = {
i: index,
t: threshold,
n: numShares,
y: (0, util_1.bigIntToBufferLE)(y, 32).toString('hex'),
seed: actualSeed.toString('hex'),
chaincode: chaincode.toString('hex'),
};
const shares = {
uShare: P_i,
yShares: {},
};
for (const ind in split_u) {
const i = parseInt(ind, 10);
if (i === index) {
continue;
}
shares.yShares[i] = {
i,
j: P_i.i,
y: (0, util_1.bigIntToBufferLE)(y, 32).toString('hex'),
v: (0, util_1.bigIntToBufferLE)(v[0], 32).toString('hex'),
u: (0, util_1.bigIntToBufferLE)(split_u[ind], 32).toString('hex'),
chaincode: chaincode.toString('hex'),
};
}
return shares;
}
keyCombine(uShare, yShares) {
const h = (0, crypto_1.createHash)('sha512').update(Buffer.from(uShare.seed, 'hex')).digest();
const u = (0, util_1.clamp)((0, util_1.bigIntFromBufferLE)(h.slice(0, 32)));
const yValues = [uShare, ...yShares].map((share) => (0, util_1.bigIntFromBufferLE)(Buffer.from(share.y, 'hex')));
const y = yValues.reduce((partial, share) => Eddsa.curve.pointAdd(partial, share));
const chaincodes = [uShare, ...yShares].map(({ chaincode }) => (0, util_1.bigIntFromBufferBE)(Buffer.from(chaincode, 'hex')));
const chaincode = chaincodes.reduce((acc, chaincode) => (acc + chaincode) % base);
// Verify shares.
for (const share of yShares) {
if ('v' in share) {
try {
Eddsa.shamir.verify((0, util_1.bigIntFromBufferLE)(Buffer.from(share.u, 'hex')), [(0, util_1.bigIntFromBufferLE)(Buffer.from(share.y, 'hex')), (0, util_1.bigIntFromBufferLE)(Buffer.from(share.v, 'hex'))], uShare.i);
}
catch (err) {
throw new Error(`Could not verify share from participant ${share.j}. Verification error: ${err}`);
}
}
}
const P_i = {
i: uShare.i,
t: uShare.t,
n: uShare.n,
y: (0, util_1.bigIntToBufferLE)(y, 32).toString('hex'),
u: (0, util_1.bigIntToBufferLE)(u, 32).toString('hex'),
prefix: h.slice(32).toString('hex'),
chaincode: (0, util_1.bigIntToBufferBE)(chaincode, 32).toString('hex'),
};
const players = {
pShare: P_i,
jShares: {},
};
for (let ind = 0; ind < yShares.length; ind++) {
const P_j = yShares[ind];
players.jShares[P_j.j] = {
i: P_j.j,
j: P_i.i,
};
}
return players;
}
/**
* Derives a child common keychain from common keychain
*
* @param commonKeychain - common keychain as a hex string
* @param path - bip32 path
* @return {string} derived common keychain as a hex string
*/
deriveUnhardened(commonKeychain, path) {
if (this.hdTree === undefined) {
throw new Error("Can't derive key without HDTree implementation");
}
const keychain = Buffer.from(commonKeychain, 'hex');
const derivedPublicKeychain = this.hdTree.publicDerive({
pk: (0, util_1.bigIntFromBufferLE)(keychain.slice(0, 32)),
chaincode: (0, util_1.bigIntFromBufferBE)(keychain.slice(32)),
}, path);
const derivedPk = (0, util_1.bigIntToBufferLE)(derivedPublicKeychain.pk, 32).toString('hex');
const derivedChaincode = (0, util_1.bigIntToBufferBE)(derivedPublicKeychain.chaincode, 32).toString('hex');
return derivedPk + derivedChaincode;
}
keyDerive(uShare, yShares, path) {
if (this.hdTree === undefined) {
throw new Error("Can't derive key without HDTree implementation");
}
const h = (0, crypto_1.createHash)('sha512').update(Buffer.from(uShare.seed, 'hex')).digest();
const yValues = [uShare, ...yShares].map((share) => (0, util_1.bigIntFromBufferLE)(Buffer.from(share.y, 'hex')));
const y = yValues.reduce((partial, share) => Eddsa.curve.pointAdd(partial, share));
const u = (0, util_1.clamp)((0, util_1.bigIntFromBufferLE)(h.slice(0, 32)));
const prefix = (0, util_1.bigIntFromBufferBE)(h.slice(32));
let contribChaincode = (0, util_1.bigIntFromBufferBE)(Buffer.from(uShare.chaincode, 'hex'));
const chaincodes = [
contribChaincode,
...yShares.map(({ chaincode }) => (0, util_1.bigIntFromBufferBE)(Buffer.from(chaincode, 'hex'))),
];
const chaincode = chaincodes.reduce((acc, chaincode) => (acc + chaincode) % base);
// Derive subkey.
const subkey = this.hdTree.privateDerive({ pk: y, sk: u, prefix, chaincode }, path);
// Calculate new public key contribution.
const contribY = Eddsa.curve.basePointMult(subkey.sk);
// Calculate new chaincode contribution.
const chaincodeDelta = (base + subkey.chaincode - chaincode) % base;
contribChaincode = (contribChaincode + chaincodeDelta) % base;
// Calculate new u values.
const { shares: split_u, v } = Eddsa.shamir.split(subkey.sk, uShare.t, uShare.n);
const P_i = {
i: uShare.i,
t: uShare.t,
n: uShare.n,
y: (0, util_1.bigIntToBufferLE)(subkey.pk, 32).toString('hex'),
u: (0, util_1.bigIntToBufferLE)(subkey.sk, 32).toString('hex'),
prefix: (0, util_1.bigIntToBufferBE)(subkey.prefix, 32).toString('hex'),
chaincode: (0, util_1.bigIntToBufferBE)(subkey.chaincode, 32).toString('hex'),
};
const shares = {
pShare: P_i,
yShares: {},
};
for (let ind = 0; ind < yShares.length; ind++) {
const P_j = yShares[ind];
shares.yShares[P_j.j] = {
i: P_j.j,
j: P_i.i,
y: (0, util_1.bigIntToBufferLE)(contribY, 32).toString('hex'),
v: (0, util_1.bigIntToBufferLE)(v[0], 32).toString('hex'),
u: (0, util_1.bigIntToBufferLE)(split_u[P_j.j], 32).toString('hex'),
chaincode: (0, util_1.bigIntToBufferBE)(contribChaincode, 32).toString('hex'),
};
}
return shares;
}
signShare(message, pShare, jShares, seed) {
if (seed && seed.length !== 64) {
throw new Error('Seed must have length 64');
}
const indices = [pShare, ...jShares].map(({ i }) => i);
const { shares: split_u, v } = Eddsa.shamir.split((0, util_1.bigIntFromBufferLE)(Buffer.from(pShare.u, 'hex')), pShare.t, pShare.n);
// Generate nonce contribution.
const prefix = Buffer.from(pShare.prefix, 'hex');
const randomBuffer = seed ?? (0, crypto_1.randomBytes)(64);
const digest = (0, crypto_1.createHash)('sha512')
.update(Buffer.concat([prefix, message, randomBuffer]))
.digest();
const r = Eddsa.curve.scalarReduce((0, util_1.bigIntFromBufferLE)(digest));
const R = Eddsa.curve.basePointMult(r);
const { shares: split_r } = Eddsa.shamir.split(r, indices.length, indices.length, indices);
const P_i = {
i: pShare.i,
y: pShare.y,
u: (0, util_1.bigIntToBufferLE)(split_u[pShare.i], 32).toString('hex'),
r: (0, util_1.bigIntToBufferLE)(split_r[pShare.i], 32).toString('hex'),
R: (0, util_1.bigIntToBufferLE)(R, 32).toString('hex'),
};
const resultShares = {
xShare: P_i,
rShares: {},
};
for (let ind = 0; ind < jShares.length; ind++) {
const S_j = jShares[ind];
resultShares.rShares[S_j.i] = {
i: S_j.i,
j: pShare.i,
u: (0, util_1.bigIntToBufferLE)(split_u[S_j.i], 32).toString('hex'),
v: (0, util_1.bigIntToBufferLE)(v[0], 32).toString('hex'),
r: (0, util_1.bigIntToBufferLE)(split_r[S_j.i], 32).toString('hex'),
R: (0, util_1.bigIntToBufferLE)(R, 32).toString('hex'),
commitment: (0, util_1.bigIntToBufferLE)(Eddsa.curve.basePointMult(split_r[S_j.i]), 32).toString('hex'),
};
}
return resultShares;
}
sign(message, playerShare, rShares, yShares = []) {
for (const rShare of rShares) {
this.validateCommitment(rShare);
}
const S_i = playerShare;
const uValues = [playerShare, ...rShares, ...yShares].map(({ u }) => (0, util_1.bigIntFromBufferLE)(Buffer.from(u, 'hex')));
const x = uValues.reduce((acc, u) => Eddsa.curve.scalarAdd(acc, u));
const RValues = [playerShare, ...rShares].map(({ R }) => (0, util_1.bigIntFromBufferLE)(Buffer.from(R, 'hex')));
const R = RValues.reduce((partial, share) => Eddsa.curve.pointAdd(partial, share));
const rValues = [playerShare, ...rShares].map(({ r }) => (0, util_1.bigIntFromBufferLE)(Buffer.from(r, 'hex')));
const r = rValues.reduce((partial, share) => Eddsa.curve.scalarAdd(partial, share));
const combinedBuffer = Buffer.concat([(0, util_1.bigIntToBufferLE)(R, 32), Buffer.from(S_i.y, 'hex'), message]);
const digest = (0, crypto_1.createHash)('sha512').update(combinedBuffer).digest();
const k = Eddsa.curve.scalarReduce((0, util_1.bigIntFromBufferLE)(digest));
const gamma = Eddsa.curve.scalarAdd(r, Eddsa.curve.scalarMult(k, x));
const result = {
i: playerShare.i,
y: playerShare.y,
gamma: (0, util_1.bigIntToBufferLE)(gamma, 32).toString('hex'),
R: (0, util_1.bigIntToBufferLE)(R, 32).toString('hex'),
};
return result;
}
signCombine(shares) {
const y = shares[0].y;
const R = shares[0].R;
const resultShares = {};
for (const ind in shares) {
const S_i = shares[ind];
resultShares[S_i.i] = (0, util_1.bigIntFromBufferLE)(Buffer.from(S_i.gamma, 'hex'));
}
const sigma = Eddsa.shamir.combine(resultShares);
const result = {
y,
R,
sigma: (0, util_1.bigIntToBufferLE)(sigma, 32).toString('hex'),
};
return result;
}
verify(message, signature) {
const publicKey = (0, util_1.bigIntFromBufferLE)(Buffer.from(signature.y, 'hex'));
const signedMessage = Buffer.concat([Buffer.from(signature.R, 'hex'), Buffer.from(signature.sigma, 'hex')]);
return Eddsa.curve.verify(message, signedMessage, publicKey);
}
validateCommitment(RShare) {
(0, assert_1.default)(RShare.commitment, 'Commitment is missing');
const c = Eddsa.curve.basePointMult((0, util_1.bigIntFromBufferLE)(Buffer.from(RShare.r, 'hex')));
const otherPlayerCommitment = (0, util_1.bigIntFromBufferLE)(Buffer.from(RShare.commitment, 'hex'));
if (c !== otherPlayerCommitment) {
throw new Error('Could not verify other player share');
}
}
}
Eddsa.curve = new curves_1.Ed25519Curve();
Eddsa.shamir = new shamir_1.default(Eddsa.curve);
Eddsa.initialized = false;
exports.default = Eddsa;
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* Module provides functions for MPC using threshold signature scheme (TSS). It contains\n * functions for key generation and message signing with EdDSA.\n *\n *\n * ======================\n * EdDSA Key Generation\n * ======================\n * 1. Each signer generates their own key share, which involves a private u-share and a public y-share.\n * 2. Signers distribute their y-share to other signers.\n * 3. After exchanging y-shares the next phase is to combine key shares. Each signer combines their u-share\n *    with the y-shares received from other signers in order to generate a p-share for themselves. We\n *    also save j-shares for other signers.\n * 4. At this point the players do not distribute any shares and the first phase of the\n *    signing protocol is complete.\n *\n * ======================\n * EdDSA Signing\n * ======================\n * 1. The parties from key generation decide they want to sign something. They begin the signing protocol\n *    by generating shares of an ephemeral key.\n *\n *    a) Each signer uses his p-share and the j-shares stored for other players to generate his signing share.\n *    b) This results in each signer having a private x-share and public r-shares.\n *\n * 2. Signers distribute their r-shares to other signers.\n * 3. After exchanging r-shares, each signer signs their share of the ephemeral key using their private\n *    x-share with the r-shares from other signers.\n * 4. This results in each signer having a public g-share which they send to the other signers.\n * 5. After the signers broadcast their g-shares, the final signature can be re-constructed independently.\n */\nimport { randomBytes, createHash } from 'crypto';\nimport { Ed25519Curve } from '../../curves';\nimport Shamir from '../../shamir';\nimport { bigIntFromBufferLE, bigIntToBufferLE, bigIntFromBufferBE, bigIntToBufferBE, clamp } from '../../util';\nimport {\n  KeyShare,\n  UShare,\n  YShare,\n  KeyCombine,\n  PShare,\n  SubkeyShare,\n  JShare,\n  SignShare,\n  Signature,\n  XShare,\n  RShare,\n  GShare,\n} from './types';\nimport assert from 'assert';\nimport { HDTree } from '@bitgo/sdk-lib-mpc';\n\n// 2^256\nconst base = BigInt('0x010000000000000000000000000000000000000000000000000000000000000000');\n\nexport default class Eddsa {\n  static curve: Ed25519Curve = new Ed25519Curve();\n  static shamir: Shamir = new Shamir(Eddsa.curve);\n  static initialized = false;\n\n  static async initialize(hdTree?: HDTree): Promise<Eddsa> {\n    if (!Eddsa.initialized) {\n      await Ed25519Curve.initialize();\n      Eddsa.initialized = true;\n    }\n\n    return new Eddsa(hdTree);\n  }\n\n  hdTree?: HDTree;\n\n  constructor(hdTree?: HDTree) {\n    this.hdTree = hdTree;\n  }\n\n  keyShare(index: number, threshold: number, numShares: number, seed?: Buffer): KeyShare {\n    if (!(index > 0 && index <= numShares)) {\n      throw new Error('Invalid KeyShare config');\n    }\n    if (seed && seed.length !== 64) {\n      throw new Error('Seed must have length 64');\n    }\n    const seedchain = seed ?? randomBytes(64);\n    const actualSeed = seedchain.slice(0, 32);\n    const chaincode = seedchain.slice(32);\n    const h = createHash('sha512').update(actualSeed).digest();\n    const u = clamp(bigIntFromBufferLE(h.slice(0, 32)));\n    const y = Eddsa.curve.basePointMult(u);\n    const { shares: split_u, v } = Eddsa.shamir.split(u, threshold, numShares);\n\n    const P_i: UShare = {\n      i: index,\n      t: threshold,\n      n: numShares,\n      y: bigIntToBufferLE(y, 32).toString('hex'),\n      seed: actualSeed.toString('hex'),\n      chaincode: chaincode.toString('hex'),\n    };\n    const shares: KeyShare = {\n      uShare: P_i,\n      yShares: {},\n    };\n\n    for (const ind in split_u) {\n      const i = parseInt(ind, 10);\n      if (i === index) {\n        continue;\n      }\n      shares.yShares[i] = {\n        i,\n        j: P_i.i,\n        y: bigIntToBufferLE(y, 32).toString('hex'),\n        v: bigIntToBufferLE(v[0], 32).toString('hex'),\n        u: bigIntToBufferLE(split_u[ind], 32).toString('hex'),\n        chaincode: chaincode.toString('hex'),\n      };\n    }\n    return shares;\n  }\n\n  keyCombine(uShare: UShare, yShares: YShare[]): KeyCombine {\n    const h = createHash('sha512').update(Buffer.from(uShare.seed, 'hex')).digest();\n    const u = clamp(bigIntFromBufferLE(h.slice(0, 32)));\n    const yValues = [uShare, ...yShares].map((share) => bigIntFromBufferLE(Buffer.from(share.y, 'hex')));\n    const y = yValues.reduce((partial, share) => Eddsa.curve.pointAdd(partial, share));\n    const chaincodes = [uShare, ...yShares].map(({ chaincode }) => bigIntFromBufferBE(Buffer.from(chaincode, 'hex')));\n    const chaincode = chaincodes.reduce((acc, chaincode) => (acc + chaincode) % base);\n\n    // Verify shares.\n    for (const share of yShares) {\n      if ('v' in share) {\n        try {\n          Eddsa.shamir.verify(\n            bigIntFromBufferLE(Buffer.from(share.u, 'hex')),\n            [bigIntFromBufferLE(Buffer.from(share.y, 'hex')), bigIntFromBufferLE(Buffer.from(share.v!, 'hex'))],\n            uShare.i\n          );\n        } catch (err) {\n          throw new Error(`Could not verify share from participant ${share.j}. Verification error: ${err}`);\n        }\n      }\n    }\n\n    const P_i: PShare = {\n      i: uShare.i,\n      t: uShare.t,\n      n: uShare.n,\n      y: bigIntToBufferLE(y, 32).toString('hex'),\n      u: bigIntToBufferLE(u, 32).toString('hex'),\n      prefix: h.slice(32).toString('hex'),\n      chaincode: bigIntToBufferBE(chaincode, 32).toString('hex'),\n    };\n    const players: KeyCombine = {\n      pShare: P_i,\n      jShares: {},\n    };\n\n    for (let ind = 0; ind < yShares.length; ind++) {\n      const P_j = yShares[ind];\n      players.jShares[P_j.j] = {\n        i: P_j.j,\n        j: P_i.i,\n      };\n    }\n    return players;\n  }\n\n  /**\n   * Derives a child common keychain from common keychain\n   *\n   * @param commonKeychain - common keychain as a hex string\n   * @param path - bip32 path\n   * @return {string} derived common keychain as a hex string\n   */\n  deriveUnhardened(commonKeychain: string, path: string): string {\n    if (this.hdTree === undefined) {\n      throw new Error(\"Can't derive key without HDTree implementation\");\n    }\n\n    const keychain = Buffer.from(commonKeychain, 'hex');\n\n    const derivedPublicKeychain = this.hdTree.publicDerive(\n      {\n        pk: bigIntFromBufferLE(keychain.slice(0, 32)),\n        chaincode: bigIntFromBufferBE(keychain.slice(32)),\n      },\n      path\n    );\n\n    const derivedPk = bigIntToBufferLE(derivedPublicKeychain.pk, 32).toString('hex');\n    const derivedChaincode = bigIntToBufferBE(derivedPublicKeychain.chaincode, 32).toString('hex');\n\n    return derivedPk + derivedChaincode;\n  }\n\n  keyDerive(uShare: UShare, yShares: YShare[], path: string): SubkeyShare {\n    if (this.hdTree === undefined) {\n      throw new Error(\"Can't derive key without HDTree implementation\");\n    }\n    const h = createHash('sha512').update(Buffer.from(uShare.seed, 'hex')).digest();\n    const yValues = [uShare, ...yShares].map((share) => bigIntFromBufferLE(Buffer.from(share.y, 'hex')));\n    const y = yValues.reduce((partial, share) => Eddsa.curve.pointAdd(partial, share));\n    const u = clamp(bigIntFromBufferLE(h.slice(0, 32)));\n    const prefix = bigIntFromBufferBE(h.slice(32));\n    let contribChaincode = bigIntFromBufferBE(Buffer.from(uShare.chaincode, 'hex'));\n    const chaincodes = [\n      contribChaincode,\n      ...yShares.map(({ chaincode }) => bigIntFromBufferBE(Buffer.from(chaincode, 'hex'))),\n    ];\n    const chaincode = chaincodes.reduce((acc, chaincode) => (acc + chaincode) % base);\n\n    // Derive subkey.\n    const subkey = this.hdTree.privateDerive({ pk: y, sk: u, prefix, chaincode }, path);\n\n    // Calculate new public key contribution.\n    const contribY = Eddsa.curve.basePointMult(subkey.sk);\n\n    // Calculate new chaincode contribution.\n    const chaincodeDelta = (base + subkey.chaincode - chaincode) % base;\n    contribChaincode = (contribChaincode + chaincodeDelta) % base;\n\n    // Calculate new u values.\n    const { shares: split_u, v } = Eddsa.shamir.split(subkey.sk, uShare.t, uShare.n);\n\n    const P_i: PShare = {\n      i: uShare.i,\n      t: uShare.t,\n      n: uShare.n,\n      y: bigIntToBufferLE(subkey.pk, 32).toString('hex'),\n      u: bigIntToBufferLE(subkey.sk, 32).toString('hex'),\n      prefix: bigIntToBufferBE(subkey.prefix!, 32).toString('hex'),\n      chaincode: bigIntToBufferBE(subkey.chaincode, 32).toString('hex'),\n    };\n\n    const shares: SubkeyShare = {\n      pShare: P_i,\n      yShares: {},\n    };\n\n    for (let ind = 0; ind < yShares.length; ind++) {\n      const P_j = yShares[ind];\n      shares.yShares[P_j.j] = {\n        i: P_j.j,\n        j: P_i.i,\n        y: bigIntToBufferLE(contribY, 32).toString('hex'),\n        v: bigIntToBufferLE(v[0], 32).toString('hex'),\n        u: bigIntToBufferLE(split_u[P_j.j], 32).toString('hex'),\n        chaincode: bigIntToBufferBE(contribChaincode, 32).toString('hex'),\n      };\n    }\n\n    return shares;\n  }\n\n  signShare(message: Buffer, pShare: PShare, jShares: JShare[], seed?: Buffer): SignShare {\n    if (seed && seed.length !== 64) {\n      throw new Error('Seed must have length 64');\n    }\n    const indices = [pShare, ...jShares].map(({ i }) => i);\n    const { shares: split_u, v } = Eddsa.shamir.split(\n      bigIntFromBufferLE(Buffer.from(pShare.u, 'hex')),\n      pShare.t,\n      pShare.n\n    );\n\n    // Generate nonce contribution.\n    const prefix = Buffer.from(pShare.prefix, 'hex');\n    const randomBuffer = seed ?? randomBytes(64);\n\n    const digest = createHash('sha512')\n      .update(Buffer.concat([prefix, message, randomBuffer]))\n      .digest();\n\n    const r = Eddsa.curve.scalarReduce(bigIntFromBufferLE(digest));\n    const R = Eddsa.curve.basePointMult(r);\n    const { shares: split_r } = Eddsa.shamir.split(r, indices.length, indices.length, indices);\n\n    const P_i: XShare = {\n      i: pShare.i,\n      y: pShare.y,\n      u: bigIntToBufferLE(split_u[pShare.i], 32).toString('hex'),\n      r: bigIntToBufferLE(split_r[pShare.i], 32).toString('hex'),\n      R: bigIntToBufferLE(R, 32).toString('hex'),\n    };\n\n    const resultShares: SignShare = {\n      xShare: P_i,\n      rShares: {},\n    };\n\n    for (let ind = 0; ind < jShares.length; ind++) {\n      const S_j = jShares[ind];\n      resultShares.rShares[S_j.i] = {\n        i: S_j.i,\n        j: pShare.i,\n        u: bigIntToBufferLE(split_u[S_j.i], 32).toString('hex'),\n        v: bigIntToBufferLE(v[0], 32).toString('hex'),\n        r: bigIntToBufferLE(split_r[S_j.i], 32).toString('hex'),\n        R: bigIntToBufferLE(R, 32).toString('hex'),\n        commitment: bigIntToBufferLE(Eddsa.curve.basePointMult(split_r[S_j.i]), 32).toString('hex'),\n      };\n    }\n    return resultShares;\n  }\n\n  sign(message: Buffer, playerShare: XShare, rShares: RShare[], yShares: YShare[] = []): GShare {\n    for (const rShare of rShares) {\n      this.validateCommitment(rShare);\n    }\n\n    const S_i = playerShare;\n\n    const uValues = [playerShare, ...rShares, ...yShares].map(({ u }) => bigIntFromBufferLE(Buffer.from(u, 'hex')));\n    const x = uValues.reduce((acc, u) => Eddsa.curve.scalarAdd(acc, u));\n\n    const RValues = [playerShare, ...rShares].map(({ R }) => bigIntFromBufferLE(Buffer.from(R, 'hex')));\n    const R = RValues.reduce((partial, share) => Eddsa.curve.pointAdd(partial, share));\n\n    const rValues = [playerShare, ...rShares].map(({ r }) => bigIntFromBufferLE(Buffer.from(r, 'hex')));\n    const r = rValues.reduce((partial, share) => Eddsa.curve.scalarAdd(partial, share));\n\n    const combinedBuffer = Buffer.concat([bigIntToBufferLE(R, 32), Buffer.from(S_i.y, 'hex'), message]);\n    const digest = createHash('sha512').update(combinedBuffer).digest();\n    const k = Eddsa.curve.scalarReduce(bigIntFromBufferLE(digest));\n\n    const gamma = Eddsa.curve.scalarAdd(r, Eddsa.curve.scalarMult(k, x));\n    const result = {\n      i: playerShare.i,\n      y: playerShare.y,\n      gamma: bigIntToBufferLE(gamma, 32).toString('hex'),\n      R: bigIntToBufferLE(R, 32).toString('hex'),\n    };\n    return result;\n  }\n\n  signCombine(shares: GShare[]): Signature {\n    const y = shares[0].y;\n    const R = shares[0].R;\n\n    const resultShares = {};\n    for (const ind in shares) {\n      const S_i = shares[ind];\n      resultShares[S_i.i] = bigIntFromBufferLE(Buffer.from(S_i.gamma, 'hex'));\n    }\n    const sigma: bigint = Eddsa.shamir.combine(resultShares);\n    const result = {\n      y,\n      R,\n      sigma: bigIntToBufferLE(sigma, 32).toString('hex'),\n    };\n    return result;\n  }\n\n  verify(message: Buffer, signature: Signature): boolean {\n    const publicKey = bigIntFromBufferLE(Buffer.from(signature.y, 'hex'));\n    const signedMessage = Buffer.concat([Buffer.from(signature.R, 'hex'), Buffer.from(signature.sigma, 'hex')]);\n    return Eddsa.curve.verify(message, signedMessage, publicKey);\n  }\n\n  private validateCommitment(RShare: RShare): void {\n    assert(RShare.commitment, 'Commitment is missing');\n    const c = Eddsa.curve.basePointMult(bigIntFromBufferLE(Buffer.from(RShare.r, 'hex')));\n    const otherPlayerCommitment = bigIntFromBufferLE(Buffer.from(RShare.commitment, 'hex'));\n    if (c !== otherPlayerCommitment) {\n      throw new Error('Could not verify other player share');\n    }\n  }\n}\n"]}Выполнить команду
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