1 files changed, 14 insertions, 0 deletions
diff --git a/src/helpers.ts b/src/helpers.ts
index d85808acb..42863c65b 100644
--- a/src/helpers.ts
+++ b/src/helpers.ts
@@ -138,3 +138,17 @@ export function getTalerStampDate(stamp: string): Date | null {
   return new Date(sec * 1000);
 }
 
+export function hash(val: any): number {
+  const str = canonicalJson(val);
+  // https://github.com/darkskyapp/string-hash
+  let h = 5381;
+  let i = str.length;
+  while (i) {
+    h = (h * 33) ^ str.charCodeAt(--i);
+  }
+
+  /* JavaScript does bitwise operations (like XOR, above) on 32-bit signed
+  * integers. Since we want the results to be always positive, convert the
+  * signed int to an unsigned by doing an unsigned bitshift. */
+  return h >>> 0;
+}