@tokamak-zk-evm/synthesizer/dist/cjs/precompiles/07-bn254-mul.js

Tokamak zk-EVM Synthesizer - Processes Ethereum transactions into wire maps for Tokamak zk-SNARK proof generation

import { bytesToHex, setLengthRight } from "@synthesizer-libs/util";
import { EvmErrorResult, OOGResult } from '../evm.js';
import { gasLimitCheck } from './util.js';
import { getPrecompileName } from './index.js';
export function precompile07(opts) {
    const pName = getPrecompileName('07');
    const gasUsed = opts.common.param('bn254MulGas');
    if (!gasLimitCheck(opts, gasUsed, pName)) {
        return OOGResult(opts.gasLimit);
    }
    // > 128 bytes: chop off extra bytes
    // < 128 bytes: right-pad with 0-s
    const input = setLengthRight(opts.data.subarray(0, 128), 128);
    let returnData;
    try {
        returnData = opts._EVM['_bn254'].mul(input);
    }
    catch (e) {
        if (opts._debug !== undefined) {
            opts._debug(`${pName} failed: ${e.message}`);
        }
        return EvmErrorResult(e, opts.gasLimit);
    }
    // check ecmul success or failure by comparing the output length
    if (returnData.length !== 64) {
        if (opts._debug !== undefined) {
            opts._debug(`${pName} failed: OOG`);
        }
        // TODO: should this really return OOG?
        return OOGResult(opts.gasLimit);
    }
    if (opts._debug !== undefined) {
        opts._debug(`${pName} return value=${bytesToHex(returnData)}`);
    }
    return {
        executionGasUsed: gasUsed,
        returnValue: returnData,
    };
}
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