hash_pw.c

Go to the documentation of this file.

/**
 * \file
 *
 * \author  Georg Hopp
 *
 * \copyright
 * Copyright © 2012  Georg Hopp
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <sys/types.h>

#include <openssl/evp.h>
#include <openssl/rand.h>

#include "class.h"
#include "auth/storage.h"
#include "utils/memory.h"
#include "commons.h"

/*
 * I have to hash the passwords, maybe this will move in
 * a separate class in future, but now everything is done
 * here
 */
#define PBKDF2_ITERATIONS   2048

/*
 * base64 decode via openssl...
 * I do not need this i think, but I keep it...maybe I have
 * use for it later.
 *
#include <openssl/bio.h>
#include <openssl/evp.h>

#define B64_SALT  "q36MilkD6Ezlt6+G394aPYWrSwAdEhdnK8k="

BIO_METHOD * BIO_f_base64(void);

void
base64decode(char * data) {
    BIO         * bio,
                * b64;
    FILE        * b64_salt = fmemopen(B64_SALT, sizeof(B64_SALT)-1, "r");

    b64 = BIO_new(BIO_f_base64());
    bio = BIO_new_fp(b64_salt, BIO_NOCLOSE);
    bio = BIO_push(b64, bio);

    BIO_set_flags(bio, BIO_FLAGS_BASE64_NO_NL);

    if (SALT_SIZE != BIO_read(bio, data, SALT_SIZE)) {
        return -1;
    }

    BIO_free_all(bio);
    fclose(b64_salt);
}
*/

int
hash_pw(
        const char    *  password,
        const size_t     npassword,
        unsigned char *  hash,
        unsigned char ** salt)
{
    if (NULL == *salt) {
        *salt = memCalloc(SALT_SIZE, sizeof(unsigned char));
        if (0 > RAND_pseudo_bytes(*salt, SALT_SIZE)) {
            MEM_FREE(*salt);
            return FALSE;
        }
    }

    if (0 == PKCS5_PBKDF2_HMAC(
            password,
            npassword,
            *salt,
            SALT_SIZE,
            PBKDF2_ITERATIONS,
            EVP_sha512(),
            HASH_SIZE,
            hash)) {
        MEM_FREE(*salt);
        return FALSE;
    }

    return TRUE;
}

// vim: set ts=4 sw=4: