From 21bbf9e63219a551771139ea7494c8c1fbe41a4a Mon Sep 17 00:00:00 2001
From: Angelo Capossele <angelocapossele@gmail.com>
Date: Thu, 14 May 2020 10:13:50 +0100
Subject: [PATCH] Fix entropy of prng (#422)
* :bug: fix entropy of prng
* :recycle: simplify pseudoR
---
packages/prng/unix_ts_rng.go | 13 +++++--------
1 file changed, 5 insertions(+), 8 deletions(-)
diff --git a/packages/prng/unix_ts_rng.go b/packages/prng/unix_ts_rng.go
index 1cfcc683..58c212e3 100644
--- a/packages/prng/unix_ts_rng.go
+++ b/packages/prng/unix_ts_rng.go
@@ -1,8 +1,7 @@
package prng
import (
- "bytes"
- "encoding/binary"
+ "math/rand"
"time"
)
@@ -62,12 +61,10 @@ func (utrng *UnixTimestampPrng) send() {
now := utrng.timeSourceFunc()
// reduce to last resolution
timePoint := now - (now % utrng.resolution)
- // convert to float64
- buf := bytes.NewBuffer(make([]byte, 0, 8))
- if err := binary.Write(buf, binary.LittleEndian, timePoint); err != nil {
- panic(err)
- }
- pseudoR := float64(binary.BigEndian.Uint64(buf.Bytes()[:8])>>11) / (1 << 53)
+
+ // add entropy and convert to float64
+ pseudoR := rand.New(rand.NewSource(timePoint)).Float64()
+
// skip slow consumers
select {
case utrng.c <- pseudoR:
--
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