remove ginext/mongoext (no-dep lib)

cryptext/hash.go

@@ -0,0 +1,22 @@
+package cryptext
+
+import (
+	"crypto/sha256"
+	"fmt"
+)
+
+func StrSha256(v string) string {
+	h := sha256.New()
+	h.Write([]byte(v))
+	bs := h.Sum(nil)
+	sh := fmt.Sprintf("%x", bs)
+	return sh
+}
+
+func BytesSha256(v []byte) string {
+	h := sha256.New()
+	h.Write(v)
+	bs := h.Sum(nil)
+	sh := fmt.Sprintf("%x", bs)
+	return sh
+}