Thoughts on signing

[coolaj86]

My small test case should:

• attach index to input
• sign over only the single input
• sign over all outputs
• verify that a fee wasn't adjusted
• verify that the input has a lock (not unlock) script
• single byte sighash after true sig

Resources

• https://docs.dash.org/projects/core/en/20.1.0/docs/guide/transactions-signature-hash-types.html
• https://wiki.bitcoinsv.io/index.php/SIGHASH_flags

/** @type {PubKeyHashToAddress} */
    _DashKeys.pkhToAddr = async function (shaRipeBytes, opts) {
      let pubKeyHash = Utils.bytesToHex(shaRipeBytes);
      let version = opts?.version;

      switch (version) {
        case null:
              /* fallsthrough */
        case undefined:
              break;
        case "testnet":
          version = DASH_PKH_TESTNET;
              break;
          default:
              throw new Error('bad version');
      }

/** @type {PrivateKeyToWif} */
    _DashKeys.privKeyToWif = async function (privBytes, opts) {
      let privateKey = Utils.bytesToHex(privBytes);
      let version = opts?.version;

      switch (version) {
        case null:
              /* fallsthrough */
        case undefined:
              break;
        case "testnet":
          version = DASH_PRIV_KEY_TESTNET;
              break;
          default:
              throw new Error('bad version');
      }