Merge pull request #2126 from PR0M3TH3AN/perf/optimize-nip46-normalization-quadratic-5068119382655595013

⚡ Optimize NIP-46 payload normalization to avoid O(N^2) on large inputs

benchmarks/nip46_normalization_bench.js

@@ -0,0 +1,28 @@
+
+import { normalizeNip46CiphertextPayload } from "../js/nostr/nip46Client.js";
+
+const ITERATIONS = 100;
+const ARRAY_SIZE = 200;
+
+function runBenchmark() {
+  const largeArray = Array.from({ length: ARRAY_SIZE }, (_, i) => `string_${i}`);
+
+  // Wrap in a structure that triggers the recursive coerce and then the array handling
+  const payload = {
+    data: largeArray
+  };
+
+  const start = performance.now();
+
+  for (let i = 0; i < ITERATIONS; i++) {
+    normalizeNip46CiphertextPayload(payload);
+  }
+
+  const end = performance.now();
+  const duration = end - start;
+
+  console.log(`Time taken for ${ITERATIONS} iterations with array size ${ARRAY_SIZE}: ${duration.toFixed(2)}ms`);
+  console.log(`Average time per iteration: ${(duration / ITERATIONS).toFixed(2)}ms`);
+}
+
+runBenchmark();

js/nostr/nip46Client.js

@@ -945,7 +945,7 @@ export function normalizeNip46CiphertextPayload(payload) {
         }
       }
 
-      if (scalarEntries.length >= 2) {
+      if (scalarEntries.length >= 2 && scalarEntries.length <= 16) {
         for (let i = 0; i < scalarEntries.length; i += 1) {
           for (let j = i + 1; j < scalarEntries.length; j += 1) {
             addCiphertextWithNonce(scalarEntries[i], scalarEntries[j]);