1 files changed, 41 insertions, 0 deletions
diff --git a/src/crypto/sha256/example_test.go b/src/crypto/sha256/example_test.go
new file mode 100644
index 0000000..7d73120
--- /dev/null
+++ b/src/crypto/sha256/example_test.go
@@ -0,0 +1,41 @@
+// Copyright 2016 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 sha256_test
+
+import (
+	"crypto/sha256"
+	"fmt"
+	"io"
+	"log"
+	"os"
+)
+
+func ExampleSum256() {
+	sum := sha256.Sum256([]byte("hello world\n"))
+	fmt.Printf("%x", sum)
+	// Output: a948904f2f0f479b8f8197694b30184b0d2ed1c1cd2a1ec0fb85d299a192a447
+}
+
+func ExampleNew() {
+	h := sha256.New()
+	h.Write([]byte("hello world\n"))
+	fmt.Printf("%x", h.Sum(nil))
+	// Output: a948904f2f0f479b8f8197694b30184b0d2ed1c1cd2a1ec0fb85d299a192a447
+}
+
+func ExampleNew_file() {
+	f, err := os.Open("file.txt")
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer f.Close()
+
+	h := sha256.New()
+	if _, err := io.Copy(h, f); err != nil {
+		log.Fatal(err)
+	}
+
+	fmt.Printf("%x", h.Sum(nil))
+}