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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main(int argc, char** argv) {
if(argc==0) {
fprintf(stderr, "Arguments fool!");
return 1;
}
FILE* file = fopen(argv[1], "r");
fseek(file, 0, SEEK_END);
int length = ftell(file);
fseek(file, 0, SEEK_SET);
char filearr[length];
fread(filearr, length, 1, file);
fclose(file);
printf("Enter Passphrase:\n");
char passphrase[81];
fgets(passphrase, 81, stdin);
int passlen = strlen(passphrase) - 1;
int i=0,j=0;
for(i=0;i<length;i++) {
if(j==passlen) {
j=0;
i--;
} else {
filearr[i] += passphrase[j];
j++;
}
}
file = fopen(argv[1], "w");
fwrite(filearr, 1, length, file);
fflush(file);
fclose(file);
return 0;
}
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