@ethereumjs/evm
Version:
JavaScript Ethereum Virtual Machine (EVM) implementation
65 lines • 2.77 kB
JavaScript
import { bytesToHex } from '@ethereumjs/util';
import { EVMError } from "../errors.js";
import { EVMErrorResult, OOGResult } from "../evm.js";
import { BLS_GAS_DISCOUNT_PAIRS_G1, leading16ZeroBytesCheck, msmGasUsed, } from "./bls12_381/index.js";
import { getPrecompileName } from "./index.js";
import { gasLimitCheck, moduloLengthCheck } from "./util.js";
export async function precompile0c(opts) {
const pName = getPrecompileName('0d');
const bls = opts._EVM['_bls'];
const inputData = opts.data;
if (inputData.length === 0) {
if (opts._debug !== undefined) {
opts._debug(`${pName} failed: Empty input`);
}
return EVMErrorResult(new EVMError(EVMError.errorMessages.BLS_12_381_INPUT_EMPTY), opts.gasLimit); // follow Geth's implementation
}
// TODO: Double-check respectively confirm that this order is really correct that the gas check
// on this eventually to be "floored" pair number should happen before the input length modulo
// validation (same for g2msm)
const numPairs = Math.floor(inputData.length / 160);
const gasUsedPerPair = opts.common.param('bls12381G1MulGas') ?? BigInt(0);
const gasUsed = msmGasUsed(numPairs, gasUsedPerPair, BLS_GAS_DISCOUNT_PAIRS_G1);
if (!gasLimitCheck(opts, gasUsed, pName)) {
return OOGResult(opts.gasLimit);
}
if (inputData.length % 160 !== 0) {
if (opts._debug !== undefined) {
opts._debug(`${pName} failed: Invalid input length length=${inputData.length}`);
}
return EVMErrorResult(new EVMError(EVMError.errorMessages.BLS_12_381_INVALID_INPUT_LENGTH), opts.gasLimit);
}
if (!moduloLengthCheck(opts, 160, pName)) {
return EVMErrorResult(new EVMError(EVMError.errorMessages.BLS_12_381_INVALID_INPUT_LENGTH), opts.gasLimit);
}
// prepare pairing list and check for mandatory zero bytes
const zeroByteRanges = [
[0, 16],
[64, 80],
];
for (let k = 0; k < numPairs; k++) {
// zero bytes check
const pairStart = 160 * k;
if (!leading16ZeroBytesCheck(opts, zeroByteRanges, pName, pairStart)) {
return EVMErrorResult(new EVMError(EVMError.errorMessages.BLS_12_381_POINT_NOT_ON_CURVE), opts.gasLimit);
}
}
let returnValue;
try {
returnValue = bls.msmG1(opts.data);
}
catch (e) {
if (opts._debug !== undefined) {
opts._debug(`${pName} failed: ${e.message}`);
}
return EVMErrorResult(e, opts.gasLimit);
}
if (opts._debug !== undefined) {
opts._debug(`${pName} return value=${bytesToHex(returnValue)}`);
}
return {
executionGasUsed: gasUsed,
returnValue,
};
}
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