add anastasis skeleton, put crypto in taler-util

1 files changed, 30 insertions, 0 deletions

diff --git a/packages/taler-util/src/prng-node.ts b/packages/taler-util/src/prng-node.ts
new file mode 100644
index 000000000..226923b8b
--- /dev/null
+++ b/packages/taler-util/src/prng-node.ts
@@ -0,0 +1,30 @@
+/*
+ This file is part of GNU Taler
+ (C) 2021 Taler Systems S.A.
+
+ GNU Taler is free software; you can redistribute it and/or modify it under the
+ terms of the GNU General Public License as published by the Free Software
+ Foundation; either version 3, or (at your option) any later version.
+
+ GNU Taler is distributed in the hope that it will be useful, but WITHOUT ANY
+ WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+ A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License along with
+ GNU Taler; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
+ */
+
+import { setPRNG } from "./nacl-fast.js";
+import cr from "crypto";
+
+export function initNodePrng() {
+  // Initialize PRNG if environment provides CSPRNG.
+  // If not, methods calling randombytes will throw.
+  if (cr && cr.randomBytes) {
+    setPRNG(function (x: Uint8Array, n: number) {
+      const v = cr.randomBytes(n);
+      for (let i = 0; i < n; i++) x[i] = v[i];
+      for (let i = 0; i < v.length; i++) v[i] = 0;
+    });
+  }
+}