add sha256 to pkg sha

kahlys · Oct 30, 2018 · 2f3a88b · 2f3a88b
1 parent aca8a41
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diff --git a/README.md b/README.md
@@ -1,2 +1,27 @@
 # webcrypto
+
+**WORK IN PROGRESS**
+
 Golang wrapper around the WebCryptoAPI
+
+## Installation
+
+With a correctly configured [Go toolchain](https://golang.org/doc/install):
+
+```
+$ go get -u github.com/gopherjs/gopherjs
+$ go get -u github.com/kahlys/webcrypto
+```
+
+## Testing
+
+Go to the test directory, compile using gopherjs, then open `test.html` with a browser and look results at the console.
+
+```
+$ cd test
+$ gopherjs build test.go
+```
+
+## Packages
+
+- `sha`: `sha-256`
diff --git a/sha/sha.go b/sha/sha.go
@@ -0,0 +1,37 @@
+package sha
+
+import (
+	"fmt"
+
+	"github.com/gopherjs/gopherjs/js"
+)
+
+// Sum256 returns the SHA-256 of the data
+func Sum256(data []byte) (res []byte, err error) {
+	return sum("SHA-256", data)
+}
+
+func sum(hash string, data []byte) (res []byte, err error) {
+	crypt := js.Global.Get("crypto")
+	if crypt == js.Undefined {
+		crypt = js.Global.Get("msCrypto")
+	}
+	crypto := crypt.Get("subtle")
+	if crypto != js.Undefined {
+		if crypto.Get("digest") != js.Undefined {
+			resChan := make(chan []byte, 1)
+			algorithm := js.M{
+				"name": hash,
+			}
+			promise := crypto.Call("digest", algorithm, data)
+			promise.Call("then", func(result *js.Object) {
+				go func() {
+					resChan <- js.Global.Get("Uint8Array").New(result).Interface().([]byte)
+				}()
+			})
+			res = <-resChan
+			return res, nil
+		}
+	}
+	return nil, fmt.Errorf("webcrypto api error: unable to get js.crypto.subtle.digest or js.msCrypto.subtle.digest")
+}
diff --git a/test/test.go b/test/test.go
@@ -0,0 +1,51 @@
+package main
+
+import (
+	"bytes"
+	"encoding/hex"
+	"fmt"
+
+	"github.com/kahlys/webcrypto/sha"
+)
+
+func testSha256() error {
+	expected, _ := hex.DecodeString("b94d27b9934d3e08a52e52d7da7dabfac484efe37a5380ee9088f7ace2efcde9")
+	actual, err := sha.Sum256([]byte("hello world"))
+	if err != nil {
+		return fmt.Errorf("sum256 error: %s", err)
+	}
+	if bytes.Compare(expected, actual) != 0 {
+		return fmt.Errorf("not expected value")
+	}
+	return nil
+}
+
+func main() {
+	register(
+		testfunc{"SHA-256", testSha256},
+	)
+	run()
+}
+
+type testfunc struct {
+	name string
+	test func() error
+}
+
+var testset []testfunc
+
+func register(tests ...testfunc) {
+	testset = append(testset, tests...)
+}
+
+func run() {
+	status := "SUCCESS"
+	for _, t := range testset {
+		fmt.Println("==", t.name)
+		if err := t.test(); err != nil {
+			fmt.Println(err)
+			status = "FAILED"
+		}
+	}
+	fmt.Printf("\nTESTS STATUS: %s\n", status)
+}
diff --git a/test/test.html b/test/test.html
@@ -0,0 +1,10 @@
+<!DOCTYPE html>
+<html>
+<head>
+	<title>WebCrypto Test</title>
+</head>
+<body>
+	<h1>Test</h1>
+	<script src="test.js"></script>
+</body>
+</html>