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-rw-r--r--src/crypto/rand/example_test.go28
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diff --git a/src/crypto/rand/example_test.go b/src/crypto/rand/example_test.go
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+// Copyright 2011 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_test
+
+import (
+ "bytes"
+ "crypto/rand"
+ "fmt"
+)
+
+// This example reads 10 cryptographically secure pseudorandom numbers from
+// rand.Reader and writes them to a byte slice.
+func ExampleRead() {
+ c := 10
+ b := make([]byte, c)
+ _, err := rand.Read(b)
+ if err != nil {
+ fmt.Println("error:", err)
+ return
+ }
+ // The slice should now contain random bytes instead of only zeroes.
+ fmt.Println(bytes.Equal(b, make([]byte, c)))
+
+ // Output:
+ // false
+}