diff --git a/ts/smartssh.classes.helpers.ts b/ts/smartssh.classes.helpers.ts
index 887dbaf..b6d580e 100644
--- a/ts/smartssh.classes.helpers.ts
+++ b/ts/smartssh.classes.helpers.ts
@@ -3,6 +3,10 @@ import plugins = require("./smartssh.plugins");
 import classes = require("./smartssh.classes");
 
 export let sshKeyArrayFromDir = function(dirArg:string):classes.sshKey[]{
-    let sshKeyArray = [];
+    let sshKeyArray = []; //TODO
     return sshKeyArray;
+}
+
+export let getKeyIndex = function(hostArg:string){
+    return 0; //TODO 
 }
\ No newline at end of file
diff --git a/ts/smartssh.classes.ts b/ts/smartssh.classes.ts
index ecadd8b..a8b36d4 100644
--- a/ts/smartssh.classes.ts
+++ b/ts/smartssh.classes.ts
@@ -26,6 +26,14 @@ export class ssh {
             return undefined;
         }
     };
+    removeKey(sshKeyArg:sshKey){
+        let keyIndex = helpers.getKeyIndex(sshKeyArg.host);
+        this.sshKeys.splice(keyIndex,1);
+    };
+    replaceKey(sshKeyOldArg:sshKey,sshKeyNewArg:sshKey){
+        let keyIndex = helpers.getKeyIndex(sshKeyOldArg.host);
+        this.sshKeys.splice(keyIndex,1,sshKeyNewArg);
+    };
     sync(){
         this.sshDir.sync(this.sshConfig,this.sshKeys); //call sync method of sshDir class;
     };