@polygon-hermez/vm
Version:
An Ethereum VM implementation
112 lines • 6.42 kB
JavaScript
;
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
return new (P || (P = Promise))(function (resolve, reject) {
function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
step((generator = generator.apply(thisArg, _arguments || [])).next());
});
};
var __generator = (this && this.__generator) || function (thisArg, body) {
var _ = { label: 0, sent: function() { if (t[0] & 1) throw t[1]; return t[1]; }, trys: [], ops: [] }, f, y, t, g;
return g = { next: verb(0), "throw": verb(1), "return": verb(2) }, typeof Symbol === "function" && (g[Symbol.iterator] = function() { return this; }), g;
function verb(n) { return function (v) { return step([n, v]); }; }
function step(op) {
if (f) throw new TypeError("Generator is already executing.");
while (g && (g = 0, op[0] && (_ = 0)), _) try {
if (f = 1, y && (t = op[0] & 2 ? y["return"] : op[0] ? y["throw"] || ((t = y["return"]) && t.call(y), 0) : y.next) && !(t = t.call(y, op[1])).done) return t;
if (y = 0, t) op = [op[0] & 2, t.value];
switch (op[0]) {
case 0: case 1: t = op; break;
case 4: _.label++; return { value: op[1], done: false };
case 5: _.label++; y = op[1]; op = [0]; continue;
case 7: op = _.ops.pop(); _.trys.pop(); continue;
default:
if (!(t = _.trys, t = t.length > 0 && t[t.length - 1]) && (op[0] === 6 || op[0] === 2)) { _ = 0; continue; }
if (op[0] === 3 && (!t || (op[1] > t[0] && op[1] < t[3]))) { _.label = op[1]; break; }
if (op[0] === 6 && _.label < t[1]) { _.label = t[1]; t = op; break; }
if (t && _.label < t[2]) { _.label = t[2]; _.ops.push(op); break; }
if (t[2]) _.ops.pop();
_.trys.pop(); continue;
}
op = body.call(thisArg, _);
} catch (e) { op = [6, e]; y = 0; } finally { f = t = 0; }
if (op[0] & 5) throw op[1]; return { value: op[0] ? op[1] : void 0, done: true };
}
};
Object.defineProperty(exports, "__esModule", { value: true });
var ethereumjs_util_1 = require("ethereumjs-util");
var evm_1 = require("../evm");
var exceptions_1 = require("../../exceptions");
var assert = require('assert');
var _a = require('./util/bls12_381'), BLS12_381_ToG1Point = _a.BLS12_381_ToG1Point, BLS12_381_ToFrPoint = _a.BLS12_381_ToFrPoint, BLS12_381_FromG1Point = _a.BLS12_381_FromG1Point;
function default_1(opts) {
return __awaiter(this, void 0, void 0, function () {
var mcl, inputData, numPairs, gasUsedPerPair, gasDiscountArray, gasDiscountMax, gasDiscountMultiplier, gasUsed, zeroBytes16, zeroByteCheck, G1Array, FrArray, k, pairStart, index, slicedBuffer, G1, Fr, result, returnValue;
return __generator(this, function (_a) {
assert(opts.data);
mcl = opts._VM._mcl;
inputData = opts.data;
if (inputData.length == 0) {
return [2 /*return*/, (0, evm_1.VmErrorResult)(new exceptions_1.VmError(exceptions_1.ERROR.BLS_12_381_INPUT_EMPTY), opts.gasLimit)]; // follow Geths implementation
}
numPairs = Math.floor(inputData.length / 160);
gasUsedPerPair = new ethereumjs_util_1.BN(opts._common.paramByEIP('gasPrices', 'Bls12381G1MulGas', 2537));
gasDiscountArray = opts._common.paramByEIP('gasPrices', 'Bls12381MultiExpGasDiscount', 2537);
gasDiscountMax = gasDiscountArray[gasDiscountArray.length - 1][1];
if (numPairs <= gasDiscountArray.length) {
if (numPairs == 0) {
gasDiscountMultiplier = 0; // this implicitly sets gasUsed to 0 as per the EIP.
}
else {
gasDiscountMultiplier = gasDiscountArray[numPairs - 1][1];
}
}
else {
gasDiscountMultiplier = gasDiscountMax;
}
gasUsed = gasUsedPerPair.imuln(numPairs).imuln(gasDiscountMultiplier).idivn(1000);
if (opts.gasLimit.lt(gasUsed)) {
return [2 /*return*/, (0, evm_1.OOGResult)(opts.gasLimit)];
}
if (inputData.length % 160 != 0) {
return [2 /*return*/, (0, evm_1.VmErrorResult)(new exceptions_1.VmError(exceptions_1.ERROR.BLS_12_381_INVALID_INPUT_LENGTH), opts.gasLimit)];
}
zeroBytes16 = Buffer.alloc(16, 0);
zeroByteCheck = [
[0, 16],
[64, 80],
];
G1Array = [];
FrArray = [];
for (k = 0; k < inputData.length / 160; k++) {
pairStart = 160 * k;
for (index in zeroByteCheck) {
slicedBuffer = opts.data.slice(zeroByteCheck[index][0] + pairStart, zeroByteCheck[index][1] + pairStart);
if (!slicedBuffer.equals(zeroBytes16)) {
return [2 /*return*/, (0, evm_1.VmErrorResult)(new exceptions_1.VmError(exceptions_1.ERROR.BLS_12_381_POINT_NOT_ON_CURVE), opts.gasLimit)];
}
}
G1 = void 0;
try {
G1 = BLS12_381_ToG1Point(opts.data.slice(pairStart, pairStart + 128), mcl);
}
catch (e) {
return [2 /*return*/, (0, evm_1.VmErrorResult)(e, opts.gasLimit)];
}
Fr = BLS12_381_ToFrPoint(opts.data.slice(pairStart + 128, pairStart + 160), mcl);
G1Array.push(G1);
FrArray.push(Fr);
}
result = mcl.mulVec(G1Array, FrArray);
returnValue = BLS12_381_FromG1Point(result);
return [2 /*return*/, {
gasUsed: gasUsed,
returnValue: returnValue,
}];
});
});
}
exports.default = default_1;
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