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/*
* Copyright (c) 2011-2012 Hunter Morris <hunter.morris@smarkets.com>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "erl_nif.h"
#include "erl_blf.h"
#include "bcrypt_nif.h"
static void free_task(task_t* task)
{
if (task->env != NULL)
enif_free_env(task->env);
enif_free(task);
}
static task_t* alloc_task(task_type_t type)
{
task_t* task = (task_t*)enif_alloc(sizeof(task_t));
if (task == NULL)
return NULL;
(void)memset(task, 0, sizeof(task_t));
task->type = type;
return task;
}
static task_t* alloc_init_task(task_type_t type, ERL_NIF_TERM ref, ErlNifPid pid, int num_orig_terms, const ERL_NIF_TERM orig_terms[])
{
task_t* task = alloc_task(type);
task->pid = pid;
task->env = enif_alloc_env();
if (task->env == NULL) {
free_task(task);
return NULL;
}
if (type == HASH) {
assert(num_orig_terms == 2);
if (!enif_inspect_iolist_as_binary(
task->env, enif_make_copy(task->env, orig_terms[0]),
&task->data.hash.salt)) {
free_task(task);
return NULL;
}
if (!enif_inspect_iolist_as_binary(
task->env, enif_make_copy(task->env, orig_terms[1]),
&task->data.hash.password)) {
free_task(task);
return NULL;
}
}
task->ref = enif_make_copy(task->env, ref);
return task;
}
static ERL_NIF_TERM hashpw(task_t* task)
{
char password[1024] = { 0 };
char salt[1024] = { 0 };
char encrypted[1024] = { 0 };
size_t password_sz = 1024;
if (password_sz > task->data.hash.password.size)
password_sz = task->data.hash.password.size;
(void)memcpy(&password, task->data.hash.password.data, password_sz);
size_t salt_sz = 1024;
if (salt_sz > task->data.hash.salt.size)
salt_sz = task->data.hash.salt.size;
(void)memcpy(&salt, task->data.hash.salt.data, salt_sz);
if (ts_bcrypt(encrypted, password, salt)) {
return enif_make_tuple3(
task->env,
enif_make_atom(task->env, "error"),
task->ref,
enif_make_string(task->env, "bcrypt failed", ERL_NIF_LATIN1));
}
return enif_make_tuple3(
task->env,
enif_make_atom(task->env, "ok"),
task->ref,
enif_make_string(task->env, encrypted, ERL_NIF_LATIN1));
}
static void* async_worker(void* arg)
{
ctx_t* ctx;
task_t* task;
ERL_NIF_TERM result;
ctx = (ctx_t*)arg;
while (1) {
task = (task_t*)async_queue_pop(ctx->queue);
if (task->type == SHUTDOWN) {
free_task(task);
break;
} else if (task->type == HASH) {
result = hashpw(task);
} else {
errx(1, "Unexpected task type: %i", task->type);
}
enif_send(NULL, &task->pid, task->env, result);
free_task(task);
}
return NULL;
}
static ERL_NIF_TERM bcrypt_encode_salt(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
{
ErlNifBinary csalt, bin;
unsigned long log_rounds;
ERL_NIF_TERM ret;
if (!enif_inspect_binary(env, argv[0], &csalt) || 16 != csalt.size) {
return enif_make_badarg(env);
}
if (!enif_get_ulong(env, argv[1], &log_rounds)) {
enif_release_binary(&csalt);
return enif_make_badarg(env);
}
if (!enif_alloc_binary(64, &bin)) {
enif_release_binary(&csalt);
return enif_make_badarg(env);
}
encode_salt((char *)bin.data, (u_int8_t*)csalt.data, csalt.size, log_rounds);
enif_release_binary(&csalt);
ret = enif_make_string(env, (char *)bin.data, ERL_NIF_LATIN1);
enif_release_binary(&bin);
return ret;
}
static ERL_NIF_TERM bcrypt_hashpw(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
{
ctx_t *ctx;
task_t *task;
ErlNifPid pid;
if (argc != 5)
return enif_make_badarg(env);
bcrypt_privdata_t *priv = (bcrypt_privdata_t*)enif_priv_data(env);
if (!enif_get_resource(env, argv[0], priv->bcrypt_rt, (void**)(&ctx)))
return enif_make_badarg(env);
if (!enif_is_ref(env, argv[1]))
return enif_make_badarg(env);
if (!enif_get_local_pid(env, argv[2], &pid))
return enif_make_badarg(env);
ERL_NIF_TERM orig_terms[] = { argv[4], argv[3] };
task = alloc_init_task(HASH, argv[1], pid, 2, orig_terms);
if (!task)
return enif_make_badarg(env);
async_queue_push(ctx->queue, task);
return enif_make_atom(env, "ok");
}
static ERL_NIF_TERM bcrypt_create_ctx(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
{
ERL_NIF_TERM ret;
bcrypt_privdata_t *priv = (bcrypt_privdata_t*)enif_priv_data(env);
ctx_t* ctx = (ctx_t*)enif_alloc_resource(priv->bcrypt_rt, sizeof(ctx_t));
if (ctx == NULL)
return enif_make_badarg(env);
ctx->queue = async_queue_create("bcrypt_queue_mutex", "bcrypt_queue_condvar");
ctx->topts = enif_thread_opts_create("bcrypt_thread_opts");
if (enif_thread_create("bcrypt_worker", &ctx->tid, async_worker, ctx, ctx->topts) != 0) {
enif_release_resource(ctx);
return enif_make_badarg(env);
}
ret = enif_make_resource(env, ctx);
enif_release_resource(ctx);
return ret;
}
static ErlNifFunc bcrypt_nif_funcs[] =
{
{"encode_salt", 2, bcrypt_encode_salt},
{"hashpw", 5, bcrypt_hashpw},
{"create_ctx", 0, bcrypt_create_ctx},
};
static void bcrypt_rt_dtor(ErlNifEnv* env, void* obj)
{
ctx_t *ctx = (ctx_t*)obj;
task_t *task = alloc_task(SHUTDOWN);
void *result = NULL;
async_queue_push(ctx->queue, task);
enif_thread_join(ctx->tid, &result);
async_queue_destroy(ctx->queue);
enif_thread_opts_destroy(ctx->topts);
}
static int on_load(ErlNifEnv* env, void** priv_data, ERL_NIF_TERM load_info)
{
const char *mod = "bcrypt_nif";
const char *name = "nif_resource";
ErlNifResourceFlags flags = (ErlNifResourceFlags)(ERL_NIF_RT_CREATE | ERL_NIF_RT_TAKEOVER);
bcrypt_privdata_t *priv = (bcrypt_privdata_t*)enif_alloc(sizeof(bcrypt_privdata_t));
priv->bcrypt_rt = enif_open_resource_type(env, mod, name, bcrypt_rt_dtor, flags, NULL);
if (priv->bcrypt_rt == NULL)
return -1;
*priv_data = priv;
return 0;
}
ERL_NIF_INIT(bcrypt_nif, bcrypt_nif_funcs, &on_load, NULL, NULL, NULL)
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