Design and implement a tar utility for encrypting and decrypting a single file specified as follows;

$ tar2 e file o file.tar2 (for encrypting)

$ tar2 x file.tar2 (for decrypting)

If the option of encrypting is specified the tar app will ask for a password in order to do that. In order to decrypt an encrypted file the tar app will ask for the password.

Note 1: Do not implement the tar functionality for packing /unpacking a list of files, just the functionality for encrypting and decrypting a single file.

Note 2: For encrypting a file, implement the following algorithm; for each byte in the target file get the module 8 of the ASCII code of each character in the password reading the password from left to right and invert the corresponding bit in the byte. For decrypting a file, for each byte in the tar file get the module 8 of the ASCII code of each character in the password reading the password from right to left and invert the corresponding bit in the encrypted byte.

Is this code right for the above problem?

// encrypting and decrypting #include int Encrypt(char * FILENAME, char * NEW_FILENAME) { FILE *inFile; FILE *outFile; char Byte; char newByte; int n; int i=0;

inFile = fopen(FILENAME,"rb"); outFile = fopen(NEW_FILENAME, "w");

if(inFile == NULL || outfile == NULL){ printf("Error in opening file"); return 1; } else { printf(" File Opened, Encrypting"); while(1){ while ( !feof( inFile ) ){ Byte=fgetc(inFile); newByte=Byte+25; fputc(newByte,outFile); } printf("End of File"); break; } fclose(inFile); fclose(outFile); } }

int Decrypt (char *FILENAME, char *NEW_FILENAME) { FILE *inFile; //Declare inFile FILE *outFile; //Declare outFile

char Byte; char newByte; int i=0;

inFile = fopen(FILENAME,"rb"); outFile = fopen(NEW_FILENAME, "w");

if(inFile == NULL || outfile == NULL){ printf("Error in opening file"); return 1; } else { printf("File Opened, Decrypting"); while(1){ printf("."); while ( !feof( inFile ) ){ Byte=fgetc(inFile); newByte=Byte-25; fputc(newByte,outFile); } printf("End of File"); break; } fclose(inFile); fclose(outFile); } }

int main() { char encFile[200]; char newencFile[200]; char decFile[200]; char newdecFile[200]; enFile = "image.jpg"; newenFile = "image.jpg.en"; decFile = "image.jpg.en"; newdecFile = "image.jpg"; Encrypt(encFile, newencFile); Decrypt(decFile, newdecFile); return 0; }