hd-auth-wallet/lib/core/logic/authentication.js

const persistence = require("../persistence/persistence");
const cryptoUtil = require("../cryptoUtil");
const postSignature = require("./post-signature");

module.exports.authenticate = function(challenge, authenticationRequest, argv) {
    persistence().LoadDB()
        .then(db => {
            const url = argv.url || authenticationRequest.url;
            const userIdentifier = argv.userIdentifier || authenticationRequest.userIdentifier;
            // TODO validate lock definition has all the parameters we need
            // TODO: validate serviceExtendedPublicKey
            console.log("Looking for");
            console.log("url: ", url);
            console.log("userIdentifier: ", userIdentifier);

            return db.Lock.findOne({
                where: {
                    url: url,
                    userIdentifier: userIdentifier
                },
                include: [
                    {
                        association: db.Lock.ExtendedPublicKey, 
                        require: true,
                        include: [
                            {
                                association: db.ExtendedPublicKey.Key, // TODO rename key to wallet
                                required: true
                            }
                        ]
                    }
                ]
            })
            .then(lock => {
                if(lock) {
                    // Sign the message with the key that corresponds with this lock...
                    const verification = cryptoUtil.verifyChallenge(
                        lock.serviceExtendedPublicKey, 
                        challenge
                        );

                    if (verification) {
                        const encryptedKey = lock.extendedPublicKey.key.encryptedPrivateKey;
                        const iv = lock.extendedPublicKey.key.iv;
                        const password = "vanished";
                        const walletXpriv = cryptoUtil.decrypt(encryptedKey, password, iv);
        
                        var challengeDerivationPath = `${lock.extendedPublicKey.derivationPath}/${challenge.derivationPath.split("c/")[1]}`;
                        
                        const signature = cryptoUtil.signMessage(walletXpriv, challengeDerivationPath, challenge.message).toString('hex');
                        console.log("Signature: ", signature);

                        if(argv.p) {
                            postSignature.postSignature(authenticationRequest.responseEndpoint, {
                                id: challenge.id,
                                signature: signature
                            })
                        }
                    } else {
                        console.error("Challenge not signed by registered service.");
                    }
                    
                } else {
                    console.error("Failed to find a lock with these parameters");
                }
            })            
        })
}