Adds md5 transformation

Replaced the old md5 implementation by the mbetls one.

src/actions/transformations/md5.cc

@@ -24,30 +24,21 @@
 
 #include "modsecurity/transaction.h"
 #include "actions/transformations/transformation.h"
-
+#include "src/utils/md5.h"
 
 namespace modsecurity {
 namespace actions {
 namespace transformations {
 
-Md5::Md5(std::string action)
-    : Transformation(action) {
-    this->action_kind = 1;
-}
 
 std::string Md5::evaluate(std::string value,
     Transaction *transaction) {
-    /**
-     * @todo Implement the transformation Md5
-     */
-    if (transaction) {
-#ifndef NO_LOGS
-        transaction->debug(4, "Transformation Md5 is not implemented yet.");
-#endif
-    }
-    return value;
+    std::string ret =  Utils::Md5::digest(value);
+
+    return ret;
 }
 
+
 }  // namespace transformations
 }  // namespace actions
 }  // namespace modsecurity

src/actions/transformations/md5.h

@@ -30,9 +30,9 @@ namespace transformations {
 
 class Md5 : public Transformation {
  public:
-    explicit Md5(std::string action);
-    std::string
-    evaluate(std::string exp,
+    explicit Md5(std::string action) : Transformation(action) { }
+
+    std::string evaluate(std::string exp,
         Transaction *transaction) override;
 };