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crypto/subtle/random/random.go

@@ -0,0 +1,22 @@
+package random
+
+import (
+	"crypto/rand"
+	"encoding/binary"
+)
+
+// GetRandomBytes randomly generates n bytes.
+func GetRandomBytes(n uint32) []byte {
+	buf := make([]byte, n)
+	_, err := rand.Read(buf)
+	if err != nil {
+		panic(err) // out of randomness, should never happen
+	}
+	return buf
+}
+
+// GetRandomUint32 randomly generates an unsigned 32-bit integer.
+func GetRandomUint32() uint32 {
+	b := GetRandomBytes(4)
+	return binary.BigEndian.Uint32(b)
+}

crypto/subtle/random/random_test.go

@@ -0,0 +1,16 @@
+package random_test
+
+import (
+	"testing"
+
+	"github.com/onsonr/hway/crypto/subtle/random"
+)
+
+func TestGetRandomBytes(t *testing.T) {
+	for i := 0; i <= 32; i++ {
+		buf := random.GetRandomBytes(uint32(i))
+		if len(buf) != i {
+			t.Errorf("length of the output doesn't match the input")
+		}
+	}
+}