Source file src/crypto/rand/rand_openbsd.go

     1	// Copyright 2016 The Go Authors. All rights reserved.
     2	// Use of this source code is governed by a BSD-style
     3	// license that can be found in the LICENSE file.
     4	
     5	package rand
     6	
     7	import (
     8		"internal/syscall/unix"
     9	)
    10	
    11	func init() {
    12		altGetRandom = getRandomOpenBSD
    13	}
    14	
    15	func getRandomOpenBSD(p []byte) (ok bool) {
    16		// getentropy(2) returns a maximum of 256 bytes per call
    17		for i := 0; i < len(p); i += 256 {
    18			end := i + 256
    19			if len(p) < end {
    20				end = len(p)
    21			}
    22			err := unix.GetEntropy(p[i:end])
    23			if err != nil {
    24				return false
    25			}
    26		}
    27		return true
    28	}
    29	

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