How to use the indy-sdk.keyForLocalDid function in indy-sdk

exports.authCrypt = async function (myDid, theirDid, message) {
    let myVerkey = await sdk.keyForLocalDid(await indy.wallet.get(), myDid);
    let theirVerkey = await sdk.keyForLocalDid(await indy.wallet.get(), theirDid);
    let buffer = await sdk.cryptoAuthCrypt(await indy.wallet.get(), myVerkey, theirVerkey, Buffer.from(message, 'utf8'));
    return Buffer.from(buffer).toString('base64')
};

exports.anonDecrypt = async function (did, message) {
    let verKey = await sdk.keyForLocalDid(await indy.wallet.get(), did);
    let decryptedMessageBuffer = await sdk.cryptoAnonDecrypt(await indy.wallet.get(), verKey, message);
    let buffer = Buffer.from(decryptedMessageBuffer).toString('utf8');
    return JSON.parse(buffer);
};

exports.authDecrypt = async function (myDid, message) {
    let myVerkey = await sdk.keyForLocalDid(await indy.wallet.get(), myDid);
    let [, decryptedMessageBuffer] = await sdk.cryptoAuthDecrypt(await indy.wallet.get(), myVerkey, Buffer.from(message, 'base64'));
    let buffer = Buffer.from(decryptedMessageBuffer).toString('utf8');
    return JSON.parse(buffer);
};