Further restructure

pkg/utils/crypto/md5/md5.go

@@ -0,0 +1,27 @@
+package md5
+
+import (
+	"crypto/md5"
+	"io"
+)
+
+func Sum(reader io.Reader) ([]byte, error) {
+	hash := md5.New()
+	var err error
+	var length int
+	for err == nil {
+		byteBuffer := make([]byte, 1024*1024)
+		length, err = reader.Read(byteBuffer)
+		// While hash.Write() wouldn't mind a Nil byteBuffer
+		// It is necessary for us to verify this and break
+		if length == 0 {
+			break
+		}
+		byteBuffer = byteBuffer[0:length]
+		hash.Write(byteBuffer)
+	}
+	if err != io.EOF {
+		return nil, err
+	}
+	return hash.Sum(nil), nil
+}

pkg/utils/crypto/md5/md5_test.go

@@ -0,0 +1,23 @@
+package md5
+
+import (
+	"bytes"
+	"encoding/hex"
+	"testing"
+
+	. "gopkg.in/check.v1"
+)
+
+func Test(t *testing.T) { TestingT(t) }
+
+type MySuite struct{}
+
+var _ = Suite(&MySuite{})
+
+func (s *MySuite) TestMd5sum(c *C) {
+	testString := []byte("Test string")
+	expectedHash, _ := hex.DecodeString("0fd3dbec9730101bff92acc820befc34")
+	hash, err := Sum(bytes.NewBuffer(testString))
+	c.Assert(err, IsNil)
+	c.Assert(bytes.Equal(expectedHash, hash), Equals, true)
+}