@ethereumjs/evm/dist/esm/precompiles/06-bn254-add.js

JavaScript Ethereum Virtual Machine (EVM) implementation

import { bytesToHex, setLengthRight } from '@ethereumjs/util';
import { EVMErrorResult, OOGResult } from "../evm.js";
import { getPrecompileName } from "./index.js";
import { gasLimitCheck } from "./util.js";
export function precompile06(opts) {
    const pName = getPrecompileName('06');
    const gasUsed = opts.common.param('bn254AddGas');
    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'].add(input);
    }
    catch (e) {
        if (opts._debug !== undefined) {
            opts._debug(`${pName} failed: ${e.message}`);
        }
        return EVMErrorResult(e, opts.gasLimit);
    }
    // check ecadd success or failure by comparing the output length
    if (returnData.length !== 64) {
        if (opts._debug !== undefined) {
            opts._debug(`${pName} failed: 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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