Merge coretypes repo

packages/ripple-binary-codec/src/signing.js

@@ -0,0 +1,67 @@
+'use strict';
+/* eslint-disable func-style */
+
+const _ = require('lodash');
+const {AccountID} = require('./types');
+const binary = require('./binary');
+const {
+  serializeObject,
+  bytesToHex,
+  multiSigningData,
+  transactionID,
+  signingData
+} = binary;
+
+const FULL_CANONICAL_SIGNATURE = 0x80000000;
+
+const toHex = v => bytesToHex(v);
+const getSigner = (o) => AccountID.from(o.Signer.Account);
+const signerComparator = (a, b) => getSigner(a).compareTo(getSigner(b));
+
+function setCanonicalSignatureFlag(tx_json) {
+  tx_json.Flags |= FULL_CANONICAL_SIGNATURE;
+  tx_json.Flags >>>= 0;
+}
+
+function serializedBundle(tx_json) {
+  const serialized = serializeObject(tx_json);
+  const hash = transactionID(serialized).toHex();
+  const tx_blob = toHex(serialized);
+  return {tx_json, tx_blob, hash};
+}
+
+function signFor(tx_json_, keyPair, signingAccount = null) {
+  const tx_json = _.clone(tx_json_);
+  tx_json.SigningPubKey = '';
+  setCanonicalSignatureFlag(tx_json);
+  const signerID = signingAccount || keyPair.id();
+  const signature = keyPair.sign(multiSigningData(tx_json, signerID));
+  const signer = {
+    Signer: {
+      SigningPubKey: toHex(keyPair.publicBytes()),
+      TxnSignature: toHex(signature),
+      Account: signerID
+    }
+  };
+
+  const signers = tx_json.Signers = tx_json.Signers || [];
+  signers.push(signer);
+  signers.sort(signerComparator);
+
+  return serializedBundle(tx_json);
+}
+
+function sign(tx_json_, keyPair) {
+  const tx_json = _.clone(tx_json_);
+  setCanonicalSignatureFlag(tx_json);
+
+  tx_json.SigningPubKey = toHex(keyPair.publicBytes());
+  tx_json.TxnSignature = toHex(keyPair.sign(signingData(tx_json)));
+
+  return serializedBundle(tx_json);
+}
+
+module.exports = {
+  signFor,
+  sign
+};