| // Copyright 2010 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. |
| |
| // Package rand implements a cryptographically secure |
| // pseudorandom number generator. |
| package rand |
| |
| import "io" |
| |
| // Reader is a global, shared instance of a cryptographically |
| // strong pseudo-random generator. |
| // |
| // On Linux, Reader uses getrandom(2) if available, /dev/urandom otherwise. |
| // On OpenBSD, Reader uses getentropy(2). |
| // On other Unix-like systems, Reader reads from /dev/urandom. |
| // On Windows systems, Reader uses the CryptGenRandom API. |
| var Reader io.Reader |
| |
| // Read is a helper function that calls Reader.Read using io.ReadFull. |
| // On return, n == len(b) if and only if err == nil. |
| func Read(b []byte) (n int, err error) { |
| return io.ReadFull(Reader, b) |
| } |
