Program Specification: Using the techniques presented during this semester create a complete C++ program to emulate an Encryption/Decryption Machine. The machine will be capable of the following: V Encrypt a string entered by the user v Choose between two different encryption methods V Decrypt a string entered by the user v Choose between two different decryptions methods v Decrypt without knowing the encryption method (provide all possible outputs) The interface must be professional and fully intuitive to the user
The program is missing the ability to test for all 25 shifts as stated in the program requirements, the program isn't able to run with a error with the code also please fix this.
#include<iostream>
#include<stdio.h>
#include<string.h>
#include<conio.h>
using namespace std;
class Substition// Substitution cipher class
{
char str[500];
public :
void sgetstring(void); //method to get input string and key
void senscryption(void); //ecryption method for substitution cipher
void sedecryption(void); // decryption method for substitution cipher
};
void Substitution : : sgetstring()
{
int size=500;
cout<<"\n Enter the Input String: ";
cin.getline(str,size,'\n');
}
void Substitution: :sencryption()
{
int key,i,t1;
char c;
cout<< "\n Enter Key:";
cin>> key;
cout<<"\n Encryption :";
//Encryption
for(i=0;i<strlen(str);i++)
{
c=str[i];
if(c==-1)
break;
if(isupper(c))
{
t1=(int)c - (int) 'A';
t1=(t1+key)%26;
t1=t1+(int) 'A';
cout<< (char)t1;
}
else if(islower(c))
{
t1=(int)c-(int) 'a';
t1=(t1+key) % 26;
t1=t1+(int) 'a';
cout<<(char)t1;
}
else{
cout<<c;
}
}
}
void Substitution: :sdecryption()
{
int key, i,t1;
char c;
cout<<"\n Decryption : \n";
//decryption
for(key=0;key<26;key++)
{
for(i=0;i<strlen(str); i++)
{
c=str[i];
if(c==-1)
break;
if(isupper(c))
{
t1=(int)c - (int) 'A';
t1=(t1-key +26) %26;
t1=t1+(int)'A';
cout <<(char)t1;
}
else if( islower(c))
{
t1=(int)c-(int)'a';
t1=(t1-key+26)%26;
t1=t1+(int) 'a';
cout<<(char)t1;
}
else
{
cout<<c;
}
}
cout<<"\n";
}
//ending
class Ceaser Cipher // Ceaser Ciper
{
char arr[22][22], darr[22][22], message[111],emessage[111],retmessage[111],key[55];
char temp[55], temp2[55];
public :
void tgetstring(); //method to get input string and key
void tencryption(); // ecryption method for ceaser cipher
void tdecryption(); // decryption method for ceaser cipher
void tcipher(int i, int c); //ceaser cipher module
int tfindMin(); //method to find the minimum values from the given key
void tmakeArray(int, int); // method to get the result encrypted/decrypted array
};
void CeaserCipher:: tgetstring()
{
cout<<"\n Enter the key\n";
cin.getline(key,111,'\n');
//gets(key);
cout<<"\n Enter message to be ciphered\n";
cin.getline(message,11,'\n');
//gets(message);
}
void CeaserCipher : : tencryption()
{
int i,j,klen, emlen, flag=0;
int r,c, index, rows, k=0;
strcpy_s(temp , key);
klen = strlen(key);
k=0;
for(i=0;;i++)
{
if(flag==1)
{
if(flag == 1)
break;
for(j=0; key[j]!='\0' ; j++)
{
if(message[k] == '\0')
{
flag=1;
arr[i][j]= '-';
}
else
{
arr[i][j]=message[k++];
}
}
}
r=i;
c=j;
for( i =0; i<r ; i++)
{
for(j=0;j<c;j++)
{
cout << arr[i][j];
}
cout<<"\n";
}
cout << "\n Encrypted message is \n";
k=0;
for(i=0;i<klen; i++)
{
index = this->tfindMin();
this->tcipher(index,r);
}
emessage[k] = '\0';
//printf("\n Encrypted message is \n");
//for(i=0;i<strlen(emessage); i++)
//{
// printf("%c",emessage[i]);
//}
cout<<"\n\n";
void Ceaser Cipher : : tdecryption()
{
int i, j, klen, emlen , flag=0;
int r, c, index , rows, k;
// deciphering
emlen = strlen(message);
klen = strlen(key);
//emlen is length of encrypted message
strcpy_s(temp, key);
rows = emlen/ klen;
// rows is no of rows of the array to made from ciphered message
k=0;
for(i=0;; i++)
{
if (flag==1)
break;
for(j=0; key[j]! ='\0'; j++)
{
if(message[k] =='\0')
{
flag=1;
arr[i][j] = '-';
}
else
{
arr[i][j] = message[k++];
}
}
}
r=i;
c=j;
j=0;
for(i=0, k=1; i<emlen; i++, k++)
{
temp2[j++]=message[i];
if((k%rows) == 0)
{
temp2[j]='\0';
index = this->tfindMin();
this->tmakeArray(index, rows);
j=0;
}
}
cout<<"\n Array retrieved is \n";
k=0;
for(i=0;i<r; i++)
{
for(j=0;j<c ; j++)
}
cout<< darr[i][j];
//retrieving message
retmessage[k++]= darr[i][j];
}
cout<<"\n";
}
retmessage[k] = '\0';
cout<< "\ n Message retrieved is \n";
for( i=0; retmessage[i] !='\0';i++)
cout<<retmessage[i];
}
void CeaserCipher : : tcipher(int i , int r)
{
int j, k=0;
for(j=0; j<r; j++)
{
{
emessage[k++]=arr[j][i];
cout<< emssage[k-1];
}
}
//emessage[k]='\0';
}
void CeaserCipher : : tmakeArray(int col, int row)
{
int i, j;
for(i=0; i<row; i++)
{
darr[i][col] = temp2[i];
}
}
int CeaserCipher: : tfindMin()
{
int i,j,min, index;
min=temp[0];
index=0;
for(j=0;temp[j] ='\0'; j++)
{
if( temp[j] < min)
{
min =temp[j];
index=j;
}
}
temp[index]=123;
return(index);
}
//main method
int main(int argc, char** argv)
{
int opa,ope;
char flag;
cout<<"\n select
cout<<"\n 1. Substitution :";
cout<<"\n 2. CeaserCipher:";
cin >> opa;
fflush(stdin);
if(opa==1)
{
Substitution s;
cout<<" \n Substitution Cipher \n";
s.sgetstring();
cout<< "\n what do you want to perform:\n";
cout<<"\n 1.Encryption :";
cout<<"\n 2. Descryption : ";
cin >>ope;
if(ope ==1)
{
s.sencryption();
}
else
{
s.sdecryption();
}
(opa==2)
CeaserCipher t;
cout << "\n Ceaser Cipher \ n";
t.tgetstring();
cout<<"\n What do you want to perform : \n";
cout<< "\n 1.Encryption : ");
cout<<"\n 2.Decryption:";
cin>> ope;
if(ope==1)
{
t.tencryption();
}
else
{
t.tdecryption();
}
cout<<"\n\n\n Done";
//getch();
cin>>flag;
return(0);
}
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