Rename cmd -> tools

1 files changed, 44 insertions, 0 deletions

diff --git a/tools/finditers/finditers.go b/tools/finditers/finditers.go
new file mode 100644
index 0000000..2a256c8
--- /dev/null
+++ b/tools/finditers/finditers.go
@@ -0,0 +1,44 @@
+package main
+
+import (
+	"encoding/hex"
+	"fmt"
+	"os"
+	"sort"
+	"testing"
+	"time"
+
+	"gitlab.com/rhogenson/roseh.moe/internal/pwhash"
+)
+
+var (
+	iterations int
+
+	salt, _ = hex.DecodeString("3fb84513fc3afcd6d3b230bf9ece91aaae2d2a99da17efbf7de83b21fafe3f08")
+)
+
+func BenchmarkHashIter(b *testing.B) {
+	const password = "oboe shortness ether ideology undesired fresh freezable catching mashing glimpse"
+	for b.Loop() {
+		pwhash.HashIter(password, salt, iterations)
+	}
+}
+
+func run() error {
+	for iterations = 8192; time.Duration(testing.Benchmark(BenchmarkHashIter).NsPerOp()) < 500*time.Millisecond; 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()) > 500*time.Millisecond
+	}))
+	return nil
+}
+
+func main() {
+	if err := run(); err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(1)
+	}
+}