/* binary log file example with simple XOR encryption
 * Thu May  5 00:30:19 PDT 2011 by epixoip
 */

#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <stdlib.h>

#define PLAINS_LOG "creds.log"

char key[16]="y&^4d0xj_P^*b2Z8";

struct credentials
{
   char user[255];
   char pass[255];
};

char *xor(char *str)
{
    int key_count = 0;
    char *temp, *ptr;
    int len, i;

    temp=str;
    for(len=0; *temp !='\0';temp++, len++);

    ptr=malloc(sizeof(char)*(len+1));

    for (i=0; i < len; i++)
    {
        ptr[i] = str[i] ^ key[key_count];

        key_count++;
        if (key_count == strlen(key))
            key_count = 0;
    }

    ptr[len]='\0';
    return ptr;
}

void credentials_write(char *user, char *pass)
{
    FILE *file;
    if ((file = fopen(PLAINS_LOG, "ab")) == NULL)
        return;

    struct credentials creds;
    snprintf(creds.user, sizeof(creds.user), "%s", xor(user));
    snprintf(creds.pass, sizeof(creds.pass), "%s", xor(pass));

    fwrite(&creds, sizeof creds, 1, file);
    fclose(file);
}

void credentials_readall()
{
    FILE *file;
    if ((file = fopen(PLAINS_LOG, "rb")) == NULL)
        return;

    struct credentials creds;

    while (fread(&creds, sizeof(creds), 1, file) == 1)
        printf("%s:%s\n", xor(creds.user), xor(creds.pass));

    fclose(file);
}

int main()
{
    char *username = "root";
    char *password = "rootme!";

    credentials_write(username, password);
    credentials_readall();

    return 0;
}