1 files changed, 30 insertions, 0 deletions
diff --git a/src/crypto/rand/rand_getentropy.go b/src/crypto/rand/rand_getentropy.go
new file mode 100644
index 0000000..d9e5510
--- /dev/null
+++ b/src/crypto/rand/rand_getentropy.go
@@ -0,0 +1,30 @@
+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build (darwin && !ios) || openbsd
+
+package rand
+
+import (
+	"internal/syscall/unix"
+)
+
+func init() {
+	altGetRandom = getEntropy
+}
+
+func getEntropy(p []byte) error {
+	// getentropy(2) returns a maximum of 256 bytes per call
+	for i := 0; i < len(p); i += 256 {
+		end := i + 256
+		if len(p) < end {
+			end = len(p)
+		}
+		err := unix.GetEntropy(p[i:end])
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}