diff --git a/auth-handler.go b/auth-handler.go
index cc602a26b..e9bb62d0b 100644
--- a/auth-handler.go
+++ b/auth-handler.go
@@ -19,13 +19,12 @@ package main
 import (
 	"bytes"
 	"crypto/md5"
+	"crypto/sha256"
 	"encoding/base64"
 	"encoding/hex"
 	"io/ioutil"
 	"net/http"
 	"strings"
-
-	fastSha256 "github.com/minio/minio/pkg/crypto/sha256"
 )
 
 // Verify if request has JWT.
@@ -97,7 +96,7 @@ func getRequestAuthType(r *http.Request) authType {
 
 // sum256 calculate sha256 sum for an input byte array
 func sum256(data []byte) []byte {
-	hash := fastSha256.New()
+	hash := sha256.New()
 	hash.Write(data)
 	return hash.Sum(nil)
 }
diff --git a/object-handlers.go b/object-handlers.go
index 50b3ef165..ae81688b5 100644
--- a/object-handlers.go
+++ b/object-handlers.go
@@ -17,6 +17,7 @@
 package main
 
 import (
+	"crypto/sha256"
 	"encoding/hex"
 	"encoding/xml"
 	"fmt"
@@ -29,8 +30,6 @@ import (
 	"strings"
 	"time"
 
-	fastSha256 "github.com/minio/minio/pkg/crypto/sha256"
-
 	mux "github.com/gorilla/mux"
 )
 
@@ -574,7 +573,7 @@ func (api objectAPIHandlers) PutObjectHandler(w http.ResponseWriter, r *http.Req
 
 		// Start writing in a routine.
 		go func() {
-			shaWriter := fastSha256.New()
+			shaWriter := sha256.New()
 			multiWriter := io.MultiWriter(shaWriter, writer)
 			if _, cerr := io.CopyN(multiWriter, r.Body, size); cerr != nil {
 				errorIf(cerr, "Unable to read HTTP body.", nil)
@@ -719,7 +718,7 @@ func (api objectAPIHandlers) PutObjectPartHandler(w http.ResponseWriter, r *http
 
 		// Start writing in a routine.
 		go func() {
-			shaWriter := fastSha256.New()
+			shaWriter := sha256.New()
 			multiWriter := io.MultiWriter(shaWriter, writer)
 			if _, err = io.CopyN(multiWriter, r.Body, size); err != nil {
 				errorIf(err, "Unable to read HTTP body.", nil)
diff --git a/pkg/.DS_Store b/pkg/.DS_Store
new file mode 100644
index 000000000..6425e2134
Binary files /dev/null and b/pkg/.DS_Store differ
diff --git a/pkg/crypto/sha1/sha1_sse3_amd64.syso b/pkg/crypto/sha1/sha1_sse3_amd64.syso
new file mode 100644
index 000000000..9af681c95
Binary files /dev/null and b/pkg/crypto/sha1/sha1_sse3_amd64.syso differ
diff --git a/signature-v4-utils.go b/signature-v4-utils.go
index 33b695213..86c11a117 100644
--- a/signature-v4-utils.go
+++ b/signature-v4-utils.go
@@ -18,13 +18,12 @@ package main
 
 import (
 	"crypto/hmac"
+	"crypto/sha256"
 	"encoding/hex"
 	"net/http"
 	"regexp"
 	"strings"
 	"unicode/utf8"
-
-	fastSha256 "github.com/minio/minio/pkg/crypto/sha256"
 )
 
 // isValidRegion - verify if incoming region value is valid with configured Region.
@@ -42,7 +41,7 @@ func isValidRegion(reqRegion string, confRegion string) bool {
 
 // sumHMAC calculate hmac between two input byte array.
 func sumHMAC(key []byte, data []byte) []byte {
-	hash := hmac.New(fastSha256.New, key)
+	hash := hmac.New(sha256.New, key)
 	hash.Write(data)
 	return hash.Sum(nil)
 }
diff --git a/signature-v4.go b/signature-v4.go
index 2959b7002..e33b5eaff 100644
--- a/signature-v4.go
+++ b/signature-v4.go
@@ -26,6 +26,7 @@ package main
 
 import (
 	"bytes"
+	"crypto/sha256"
 	"encoding/hex"
 	"net/http"
 	"net/url"
@@ -33,8 +34,6 @@ import (
 	"strconv"
 	"strings"
 	"time"
-
-	"github.com/minio/minio/pkg/crypto/sha256"
 )
 
 // AWS Signature Version '4' constants.