C++ Encryption/Decryption Spaces Problem Caesar Cipher

Question

C++ I have a problem with this code I can't encrypt with spaces for the caesar cipher and decrypt back for caesar cipher with spaces. I have it working on substitution cipher but I can't fix it for caesar cipher I don't know what's wrong with the code? Anyone can help me with this i've tried everything that I can possibly and I still can't figure it out. Make the changes and reupload the source code please.

https://pastebin.com/raw/SW5uDVA8

Answer 1

Well if you would use the code that I gave you, which works, you would have been done

with this..... all you had to do was build the menu around it. I have also asked you to

WORK with me on the code that I have given.

notice I am NOT encrypting and decrypting the character if

it NOT an alphabetic character. Here are the code snippets...

void EncryptCaesar(char * inbuff, int shiftNum, bool dir, char * outbuff)

{

char key[27];

if (dir)

{

memset(key,0,27);

strcpy(key,ALPHABET+shiftNum);

memcpy(key+26-shiftNum,ALPHABET,shiftNum);

}

else

{

memset(key,0,27);

memcpy(key,ALPHABET+26-shiftNum,shiftNum);

memcpy(key+shiftNum,ALPHABET,26-shiftNum);

}

cout << "key = >" <<key <<"<" << endl;

int N = strlen(inbuff);

memset(outbuff,0,N+1);

char chChar='?';

for (int iLoop=0; iLoop<N; iLoop++)

{

chChar = inbuff[iLoop];

if (isalpha(chChar))

{

outbuff[iLoop] = key[(toupper(chChar))-65];

}

else

{

outbuff[iLoop] = chChar;

}

}

}

void DecryptCaesar(char * inbuff, int shiftNum, bool dir, char * outbuff)

{

char key[27];

if (dir)

{

memset(key,0,27);

strcpy(key,ALPHABET+shiftNum);

memcpy(key+26-shiftNum,ALPHABET,shiftNum);

}

else

{

memset(key,0,27);

memcpy(key,ALPHABET+26-shiftNum,shiftNum);

memcpy(key+shiftNum,ALPHABET,26-shiftNum);

}

cout << "key = >" <<key <<"<" << endl;

int N = strlen(inbuff);

memset(outbuff,0,N+1);

char chChar='?';

for (int iLoop=0; iLoop<N; iLoop++)

{

chChar = inbuff[iLoop];

if (isalpha(chChar))

{

char * targetChar = strchr(key,toupper(chChar));

int iIndexPos = targetChar-key;

outbuff[iLoop] = ALPHABET[iIndexPos];

}

else

{

outbuff[iLoop] = chChar;

}

}

}

void EncryptSubstitution(char * inbuff, char * mixedAlphabetKey, char * outbuff)

{

int N = strlen(inbuff);

memset(outbuff,0,N+1);

char chChar='?';

for (int iLoop=0; iLoop<N; iLoop++)

{

chChar = inbuff[iLoop];

if (isalpha(chChar))

{

outbuff[iLoop] = mixedAlphabetKey[(toupper(chChar))-65];

}

else

{

outbuff[iLoop] = chChar;

}

}

}

void DecryptSubstitution(char * inbuff, char * mixedAlphabetKey, char * outbuff)

{

int N = strlen(inbuff);

memset(outbuff,0,N+1);

char chChar='?';

for (int iLoop=0; iLoop<N; iLoop++)

{

chChar = inbuff[iLoop];

if (isalpha(chChar))

{

char * targetChar = strchr(mixedAlphabetKey,toupper(chChar));

int iIndexPos = targetChar-mixedAlphabetKey;

outbuff[iLoop] = ALPHABET[iIndexPos];

}

else

{

outbuff[iLoop] = chChar;

}

}

}