input2.ts

import { bytesToBigInt, fromHex } from "@zk-email/helpers";
import { generateCircuitInputs } from "@zk-email/helpers";
import { verifyDKIMSignature } from "@zk-email/helpers/dist/dkim";
import fs from "fs"
import path from "path"
 
export const STRING_PRESELECTOR = "email was meant for @";
export const MAX_HEADER_PADDED_BYTES = 1024;
export const MAX_BODY_PADDED_BYTES = 1536;
 
export async function generateBlackByrdVerifierCircuitInputs() {
    const rawEmail = fs.readFileSync(
        path.join(__dirname, "./emails/twitter.eml"),
        "utf8"
      );
    const dkimResult = await verifyDKIMSignature(Buffer.from(rawEmail));
    const emailVerifierInputs = generateCircuitInputs({
        rsaSignature: dkimResult.signature,
        rsaPublicKey: dkimResult.publicKey,
        body: dkimResult.body,
        bodyHash:dkimResult.bodyHash,
        message: dkimResult.message,
        shaPrecomputeSelector: STRING_PRESELECTOR,
        maxMessageLength: MAX_HEADER_PADDED_BYTES,
        maxBodyLength: MAX_BODY_PADDED_BYTES
    });
 
    const bodyRemaining = emailVerifierInputs.in_body_padded!.map(c => Number(c));
    const selectorBuffer = Buffer.from(STRING_PRESELECTOR);
    const usernameIndex = Buffer.from(bodyRemaining).indexOf(selectorBuffer) + selectorBuffer.length;
 
    const address = bytesToBigInt(fromHex("0xd10339150eA31A668ca3Cb10E09c714229AF1FF9")).toString();
 
    const inputJson = {
        ...emailVerifierInputs,
        twitter_username_idx: usernameIndex.toString(),
        address,
    };
    fs.writeFileSync("./input.json", JSON.stringify(inputJson))
}
 
(async () => {
    await generateBlackByrdVerifierCircuitInputs();
}) ();