1 // Copyright 2010 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 implements a cryptographically secure 6 // pseudorandom number generator. 7 package rand 8 9 import "io" 10 11 // Reader is a global, shared instance of a cryptographically 12 // strong pseudo-random generator. 13 // 14 // On Linux, Reader uses getrandom(2) if available, /dev/urandom otherwise. 15 // On OpenBSD, Reader uses getentropy(2). 16 // On other Unix-like systems, Reader reads from /dev/urandom. 17 // On Windows systems, Reader uses the CryptGenRandom API. 18 var Reader io.Reader 19 20 // Read is a helper function that calls Reader.Read using io.ReadFull. 21 // On return, n == len(b) if and only if err == nil. 22 func Read(b []byte) (n int, err error) { 23 return io.ReadFull(Reader, b) 24 } 25
