crypto/rand: Example for Read.
R=adg, remyoudompheng, rsc, r
CC=golang-dev
https://golang.org/cl/6457085
diff --git a/src/pkg/crypto/rand/example_test.go b/src/pkg/crypto/rand/example_test.go
new file mode 100644
index 0000000..5af8e46
--- /dev/null
+++ b/src/pkg/crypto/rand/example_test.go
@@ -0,0 +1,29 @@
+// 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"
+ "io"
+)
+
+// 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)
+ n, err := io.ReadFull(rand.Reader, b)
+ if n != len(b) || 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
+}
