mox!

mox-/rand.go

@@ -0,0 +1,22 @@
+package mox
+
+import (
+	cryptorand "crypto/rand"
+	"encoding/binary"
+	"fmt"
+	mathrand "math/rand"
+)
+
+// NewRand returns a new PRNG seeded with random bytes from crypto/rand.
+func NewRand() *mathrand.Rand {
+	return mathrand.New(mathrand.NewSource(cryptoRandInt()))
+}
+
+func cryptoRandInt() int64 {
+	buf := make([]byte, 8)
+	_, err := cryptorand.Read(buf)
+	if err != nil {
+		panic(fmt.Errorf("reading random bytes: %v", err))
+	}
+	return int64(binary.LittleEndian.Uint64(buf))
+}