Adding minio-hash with streaming crypto hashes

pkgs/crypto/sha1/sha1_test.go

@@ -1,8 +1,11 @@
 package sha1
 
 import (
-	. "gopkg.in/check.v1"
+	"bytes"
+	"encoding/hex"
 	"testing"
+
+	. "gopkg.in/check.v1"
 )
 
 func Test(t *testing.T) { TestingT(t) }
@@ -24,3 +27,11 @@ func (s *MySuite) TestSha1(c *C) {
 
 	c.Assert(sha, DeepEquals, newsha)
 }
+
+func (s *MySuite) TestStreamingSha1(c *C) {
+	testString := []byte("Test string")
+	expectedHash, _ := hex.DecodeString("18af819125b70879d36378431c4e8d9bfa6a2599")
+	hash, err := Sum(bytes.NewBuffer(testString))
+	c.Assert(err, IsNil)
+	c.Assert(bytes.Equal(expectedHash, hash), Equals, true)
+}