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Source file src/crypto/rand/rand.go

Documentation: crypto/rand

     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  // random number generator.
     7  package rand
     8  
     9  import "io"
    10  
    11  // Reader is a global, shared instance of a cryptographically
    12  // secure random number 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  // On Wasm, Reader uses the Web Crypto API.
    19  var Reader io.Reader
    20  
    21  // Read is a helper function that calls Reader.Read using io.ReadFull.
    22  // On return, n == len(b) if and only if err == nil.
    23  func Read(b []byte) (n int, err error) {
    24  	return io.ReadFull(Reader, b)
    25  }
    26  

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