github.com/xushiwei/go@v0.0.0-20130601165731-2b9d83f45bc9/src/pkg/crypto/rand/example_test.go (about) 1 // Copyright 2011 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_test 6 7 import ( 8 "bytes" 9 "crypto/rand" 10 "fmt" 11 "io" 12 ) 13 14 // This example reads 10 cryptographically secure pseudorandom numbers from 15 // rand.Reader and writes them to a byte slice. 16 func ExampleRead() { 17 c := 10 18 b := make([]byte, c) 19 n, err := io.ReadFull(rand.Reader, b) 20 if n != len(b) || err != nil { 21 fmt.Println("error:", err) 22 return 23 } 24 // The slice should now contain random bytes instead of only zeroes. 25 fmt.Println(bytes.Equal(b, make([]byte, c))) 26 27 // Output: 28 // false 29 }