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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
void sanitise(char *x) {
char *curpos = x;
while (*x != '\0') {
*curpos = *x;
x++;
if (*curpos != '/') curpos++;
}
*curpos = '\0';
}
int main(int argc, char** argv) {
char * junk;
/* We need a file to encrypt */
if(argc==1) {
fprintf(stderr, "Arguments fool!");
return 1;
}
/* Now lets open that file */
FILE* file = fopen(argv[1], "r");
/* And a temporary file to hold the encrypted data */
char tpath[255] = "/tmp/";
sanitise(argv[1]);
strcat(tpath, argv[1]);
FILE* temp = fopen(tpath, "w");
char passphrase[255];
do {
/* Now we need the passphrase. Get it */
printf("Enter Passphrase:\n");
junk = fgets(passphrase, 255, stdin);
} while (strlen(passphrase) <= 0);
int passlen = strlen(passphrase) - 1;
int c,j=0;
/* Now we encrypt! */
while((c=fgetc(file)) != EOF) {
if(j==passlen) {
fputc(c ^ passphrase[0], temp);
j=1;
} else {
fputc(c ^ passphrase[j], temp);
j++;
}
}
/* Close the files */
fflush(temp);
fclose(temp);
fclose(file);
/* Move the file back */
char cmd[255];
sprintf(cmd, "%s %s %s", "/bin/mv", tpath, argv[1]);
if (system(cmd) != 0) {
fprintf(stderr, "Your encrypted file is located in %s.", tpath);
return EXIT_FAILURE;
}
return EXIT_SUCCESS;
}
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