From bcc1c2d9dd7fefa538647c0d4e9e621511f1fde6 Mon Sep 17 00:00:00 2001
From: Rose Hogenson <rosehogenson@posteo.net>
Date: Tue, 7 Oct 2025 08:31:39 -0700
Subject: Bring back pbkdf2

---
 tools/finditer/finditer.go | 43 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)
 create mode 100644 tools/finditer/finditer.go

(limited to 'tools/finditer')

diff --git a/tools/finditer/finditer.go b/tools/finditer/finditer.go
new file mode 100644
index 0000000..fbd0363
--- /dev/null
+++ b/tools/finditer/finditer.go
@@ -0,0 +1,43 @@
+package main
+
+import (
+	"encoding/hex"
+	"fmt"
+	"sort"
+	"testing"
+	"time"
+
+	"gitlab.com/rhogenson/roseh.moe/internal/pwhash"
+)
+
+func mustHex(s string) []byte {
+	b, err := hex.DecodeString(s)
+	if err != nil {
+		panic(err)
+	}
+	return b
+}
+
+const password = "emcee polio cardiac disclose superglue clapper cruelness stonework tingly unarmored"
+
+var salt = mustHex("a0aa6971f38827e5")
+
+var iterations int
+
+func BenchmarkHashIter(b *testing.B) {
+	for b.Loop() {
+		pwhash.HashIter(password, salt, iterations)
+	}
+}
+
+func main() {
+	const targetDuration = 5 * time.Second
+	for iterations = 8192; time.Duration(testing.Benchmark(BenchmarkHashIter).NsPerOp()) < targetDuration; iterations *= 2 {
+	}
+	lo := iterations / 2
+	hi := iterations
+	fmt.Println(lo + sort.Search(hi-lo, func(i int) bool {
+		iterations = lo + i
+		return time.Duration(testing.Benchmark(BenchmarkHashIter).NsPerOp()) > targetDuration
+	}))
+}
-- 
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