gui2.m

function varargout = gui2(varargin)
% GUI2 MATLAB code for gui2.fig
%      GUI2, by itself, creates a new GUI2 or raises the existing
%      singleton*.
%
%      H = GUI2 returns the handle to a new GUI2 or the handle to
%      the existing singleton*.
%
%      GUI2('CALLBACK',hObject,eventData,handles,...) calls the local
%      function named CALLBACK in GUI2.M with the given input arguments.
%
%      GUI2('Property','Value',...) creates a new GUI2 or raises the
%      existing singleton*.  Starting from the left, property value pairs are
%      applied to the GUI before gui2_OpeningFcn gets called.  An
%      unrecognized property name or invalid value makes property application
%      stop.  All inputs are passed to gui2_OpeningFcn via varargin.
%
%      *See GUI Options on GUIDE's Tools menu.  Choose "GUI allows only one
%      instance to run (singleton)".
%
% See also: GUIDE, GUIDATA, GUIHANDLES

% Edit the above text to modify the response to help gui2

% Last Modified by GUIDE v2.5 26-Apr-2020 12:29:35

% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name',       mfilename, ...
                   'gui_Singleton',  gui_Singleton, ...
                   'gui_OpeningFcn', @gui2_OpeningFcn, ...
                   'gui_OutputFcn',  @gui2_OutputFcn, ...
                   'gui_LayoutFcn',  [] , ...
                   'gui_Callback',   []);
if nargin && ischar(varargin{1})
    gui_State.gui_Callback = str2func(varargin{1});
end

if nargout
    [varargout{1:nargout}] = gui_mainfcn(gui_State, varargin{:});
else
    gui_mainfcn(gui_State, varargin{:});
end
% End initialization code - DO NOT EDIT


% --- Executes just before gui2 is made visible.
function gui2_OpeningFcn(hObject, eventdata, handles, varargin)
% This function has no output args, see OutputFcn.
% hObject    handle to figure
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
% varargin   command line arguments to gui2 (see VARARGIN)

% Choose default command line output for gui2
handles.output = hObject;

% Update handles structure
guidata(hObject, handles);

% UIWAIT makes gui2 wait for user response (see UIRESUME)
% uiwait(handles.figure1);

% --- Outputs from this function are returned to the command line.
function varargout = gui2_OutputFcn(hObject, eventdata, handles) 
% varargout  cell array for returning output args (see VARARGOUT);
% hObject    handle to figure
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Get default command line output from handles structure
varargout{1} = handles.output;


% --- Executes on button press in pushbutton1.
function pushbutton1_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
global a;
[c,d]=uigetfile();
     v=strcat(d,c);
     a=imread(v); 
     axes(handles.axes1);
     imshow(a);



% --- Executes on button press in pushbutton3.
function pushbutton3_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton3 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
global a;
global d;
global n;
p = 13;
q =31;
%calculate n
n=p*q;

%calculate Phi
Phi=(p-1)*(q-1);

%Calculate the value of e 
%1<e<phi and gcd(e,phi)=1
%x=2;e=1;
%while x > 1
%    e=e+1;
 %   x=gcd(Phi,e);
%end
for e=2:Phi
    if gcd(e,Phi)==1
        break
    end
end

%Calculate the value of d
i=1;
r=1;
while r > 0
    k=(Phi*i)+1;
    r=rem(k,e);
    disp(['Value of i is : ' num2str(i)]);
    i=i+1;
end
d=k/e;


disp(['The value of (n) is:    ' num2str(n)]);
disp(['The public key (e) is:  ' num2str(e)]);
disp(['The value of Phi(N) is: ' num2str(Phi)]);
disp(['The private key (d)is:  ' num2str(d)]);



%Input Image

input = double(a);


inputsize = size(input);
global cipher;
cipher = ones(inputsize);

%Function to Encrypt
for u=1:numel(input)
    cipher(u) = exponentmod(input(u),e,n);
end
global output;
output = ones(inputsize);

axes(handles.axes2);
imshow(uint8(cipher));
 


% --- Executes on button press in pushbutton4.
function pushbutton4_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton4 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
global cipher;
global output;
global d;
global n;
for u=1:numel(cipher)
    output(u) = exponentmod(cipher(u),d,n);
end
axes(handles.axes3);
imshow(uint8(output));