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Title File Encryption Program in C.
Author Dustin Bowers
Author Email chronx2424 [at] yahoo.com
Description A not So simple program that demonstrates the usage of
functions, points, arrays, and file I/O. Has one problem, will leave a
random character at the end of the decrypted file, but other than that, it
works fine.
Category C » File Operations
Hits 351109
Code Select and Copy the Code
/* WARNING : do not give the have the same sourcefile and destinationfile, encrypting or decrypting, this bug will be worked out as i get more interested in file encryption */ #include <stdio.h> #define ENCRYPTION_FORMULA (int) Byte + 25 #define DECRYPTION_FORMULA (int) Byte - 25 int Encrypt(char * FILENAME, char * NEW_FILENAME) { //printf("Loaded Encrypt "); FILE *inFile; //Declare inFile FILE *outFile; //Declare outFile char Byte; char newByte; int n; printf("1"); int i=0; inFile = fopen(FILENAME,"rb"); outFile = fopen(NEW_FILENAME, "w"); if(inFile==NULL) printf("Error: Can't Open inFile"); if(outFile==NULL) { printf("Error: Can't open outFile. "); return 1; } else { printf("File Opened, Encrypting"); while(1) { printf("."); if(Byte!=EOF) { Byte=fgetc(inFile); // printf("%d",Byte); newByte=Byte+25; fputc(newByte,outFile); } else { printf(" End of File"); break; } } fclose(inFile); fclose(outFile); } } int Decrypt (char *FILENAME, char *NEW_FILENAME) { //printf("Loaded Decrypt "); FILE *inFile; //Declare inFile FILE *outFile; //Declare outFile char Byte; char newByte; printf("2"); int i=0; inFile = fopen(FILENAME,"rb"); outFile = fopen(NEW_FILENAME, "w"); if(inFile==NULL) printf("Error: Can't Open inFile"); if(outFile==NULL) { printf("Error: Can't open outFile. "); return 1; } else { printf("File Opened, Decrypting"); while(1) { printf("."); if(Byte!=EOF) { Byte=fgetc(inFile); // printf("%d",Byte); newByte=Byte-25; fputc(newByte,outFile); } else { printf(" End of File"); break; } } fclose(inFile); fclose(outFile); } } int main() { char encFile[200]; char newencFile[200]; char decFile[200]; char newdecFile[200]; int choice; printf("NOTE: you must Decrypt the file with the same file extension!!! "); printf("Enter 1 to Encrypt / 2 to Decrypt "); scanf("%d",&choice); switch(choice) { case 1: printf("Enter the Source Filename: "); scanf("%s",&encFile); printf("Enter the Destination Filename: "); scanf("%s",&newencFile); Encrypt(encFile, newencFile); break; case 2: printf("Enter the Source Filename: "); scanf("%s",&decFile); printf("Enter the Destination Filename: "); scanf("%s",&newdecFile); Decrypt(decFile, newdecFile); break; } return 0; }

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