@keplr-ewallet/ewallet-sdk-cosmos/dist/utils/sign.js

import { encodeSecp256k1Signature } from "@cosmjs/amino";
export const encodeCosmosSignature = (signOutput, publicKey) => {
    // If rHex is 33 bytes (66 characters), remove the first 2 characters (1 byte)
    const rHexRaw = signOutput.sig.big_r.replace(/^0x/, "");
    const rHex = rHexRaw.length === 66 ? rHexRaw.slice(2) : rHexRaw;
    const sHex = signOutput.sig.s.replace(/^0x/, "").padStart(64, "0");
    const rBuf = Buffer.from(rHex, "hex");
    const sBuf = Buffer.from(sHex, "hex");
    const signature = Buffer.concat([rBuf, sBuf]);
    return encodeSecp256k1Signature(publicKey, signature);
};
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