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/* Copyright (c) 2010-2015, Michael Santos <michael.santos@gmail.com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* Neither the name of the author nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#if defined(__GNUC__) && defined(__linux__)
#define _GNU_SOURCE
#endif
#if defined(__linux__) || (defined(__SVR4) && defined(__sun))
#include <crypt.h>
#else
#define _XOPEN_SOURCE
#define __USE_XOPEN
#include <unistd.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <err.h>
#include <sys/errno.h>
#include <erl_nif.h>
#include <erl_driver.h>
#ifdef HAVE_CRYPT_R
#pragma message "using crypt_r"
#else
#pragma message "using crypt"
struct PrivData {
ErlNifMutex* mutex;
};
#endif
static int load_nif(ErlNifEnv *env, void **priv_data, ERL_NIF_TERM load_info)
{
#ifdef HAVE_CRYPT_R
struct crypt_data data;
data.initialized = 0;
return crypt_r("Test crypt() support", "xx", &data) == NULL;
#else
struct PrivData* p = enif_alloc(sizeof(struct PrivData));
ErlNifMutex* mutex = enif_mutex_create("msantos_crypto");
if (!p || !mutex) {
if (mutex) enif_mutex_destroy(mutex);
if (p) enif_free(p);
return 1;
};
p->mutex = mutex;
*priv_data = (void*) p;
return crypt("Test crypt() support", "xx") == NULL;
#endif
}
static ERL_NIF_TERM nif_crypt(ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[])
{
#ifdef HAVE_CRYPT_R
struct crypt_data data;
#else
struct PrivData* p = (struct PrivData*) enif_priv_data(env);
#endif
ErlNifBinary key_bin;
ErlNifBinary salt_bin;
char *result;
ErlNifBinary result_bin;
if (!enif_inspect_iolist_as_binary(env, argv[0], &key_bin))
return enif_make_badarg(env);
if (!enif_inspect_iolist_as_binary(env, argv[1], &salt_bin))
return enif_make_badarg(env);
/* NULL-terminate the key and salt binaries.
*
* Empty binaries (<<>>) are converted to a NULL terminated string (<<0>>).
*
*/
if (!enif_realloc_binary(&key_bin, key_bin.size+1))
return enif_make_badarg(env);
key_bin.data[key_bin.size-1] = '\0';
if (!enif_realloc_binary(&salt_bin, salt_bin.size+1))
return enif_make_badarg(env);
salt_bin.data[salt_bin.size-1] = '\0';
#ifdef HAVE_CRYPT_R
data.initialized = 0;
result = crypt_r((const char *)key_bin.data, (const char *)salt_bin.data,
&data);
#else
enif_mutex_lock(p->mutex);
result = crypt((const char *)key_bin.data, (const char *)salt_bin.data);
enif_mutex_unlock(p->mutex);
#endif
/* Clean up the copy of the key in our stack */
memset(key_bin.data, '\0', key_bin.size);
if (result == NULL)
return enif_make_badarg(env);
if (!enif_alloc_binary(strlen(result), &result_bin))
return enif_make_badarg(env);
/* Copy the encrypted result to the binary used as return value */
memcpy(result_bin.data, result, result_bin.size);
return enif_make_binary(env, &result_bin);
}
static void
unload_nif(ErlNifEnv* env, void* priv)
{
#ifndef HAVE_CRYPT_R
struct PrivData* p = (struct PrivData*) priv;
enif_mutex_destroy(p->mutex);
enif_free(priv);
#endif
}
static ErlNifFunc nif_funcs[] = {
{"crypt", 2, nif_crypt}
};
ERL_NIF_INIT(crypt, nif_funcs, load_nif, NULL, NULL, unload_nif)
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