keyvenant/build/module/lib/keygen.js

Keyvenant is a JavaScript tool to generate and export CovenantSQL keys to facilitate key management locally and in web extensions.

import secp256k1 from 'secp256k1/elliptic';
import coinstring from 'coinstring';
import { string2Buffer } from './utils';
import THash from './utils/THash';
import crypto from './utils/crypto';
/**
 * create CovenantSQL private key
 * use ECDS(secp256k1) for private key generation
 * @param  keySize=32 default keysize is 32 bytes
 * @return privateKey hex string
 */
export function createPrivateKey(keySize = 32) {
    // recursively try random bytes until has a valid private key
    let recursiveVerify = (randomBytes) => {
        let privateKey = randomBytes.slice(0, keySize);
        if (!isPrivateKeyValid(privateKey)) {
            return this.createPrivateKey();
        }
        return privateKey.toString('hex');
    };
    let randomBytes = crypto.randomBytes(keySize + keySize);
    return recursiveVerify(randomBytes);
}
/**
 * create public key from private key
 * use secp256k1 public key generation with compress enabled
 * @param  privateKey      private key hex string
 * @param  compressed=true default compress public key
 * @return publicKey hex string
 */
export function privateKeyToPublicKey(privateKey, compressed = true) {
    let prvBuf = string2Buffer(privateKey);
    // compressed => 33 bytes compressed public key
    // uncompressed => 65 bytes compressed public key
    let pubBuf = secp256k1.publicKeyCreate(prvBuf, compressed);
    return pubBuf.toString('hex');
}
/**
 * convert address from public key
 * 1. hash public key by THash
 * 2. base58 encode hasedPubKey to filter out O 0, I i, + /
 * @param  publicKey public key hex string
 * @param  version   version hex string to differ MainNet & TestNet
 * @return address hex string
 */
export function publicKeyToAddress(publicKey, version) {
    let pubBuf = string2Buffer(publicKey);
    // hash public key by THash
    let hasedPubKey = THash(pubBuf);
    // base58 encode hasedPubKey to filter out O 0, I i, + /
    let addressBuf = coinstring.encode(hasedPubKey, version);
    return addressBuf.toString('hex');
}
/**
 * check private key validity
 * @param  privateKey private key hex string
 * @return boolean of private key validity
 */
function isPrivateKeyValid(privateKey) {
    return secp256k1.privateKeyVerify(privateKey);
}
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