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A specification for password hashing libraries
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c_src/bcrypt_nif.c
/*
* Copyright (c) 2011 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 <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "erl_nif.h"
#include "erl_blf.h"
#define BCRYPT_MAXSALT 16 /* Precomputation is just so nice */
#define BCRYPT_SALTSPACE (7 + (BCRYPT_MAXSALT * 4 + 2) / 3 + 1)
#define BCRYPT_HASHSPACE 61
int bcrypt(const char *, const char *, char *, size_t);
void encode_salt(char *, size_t, uint8_t *, uint16_t, int);
static ERL_NIF_TERM erl_encode_salt(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
{
ErlNifBinary csalt, bin;
unsigned long log_rounds;
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, bin.size, (uint8_t*)csalt.data, csalt.size,
log_rounds);
enif_release_binary(&csalt);
return enif_make_string(env, (char *)bin.data, ERL_NIF_LATIN1);
}
static ERL_NIF_TERM hashpw(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
{
char pw[1024];
char salt[1024];
char encrypted[BCRYPT_HASHSPACE];
(void)memset(&pw, '\0', sizeof(pw));
(void)memset(&salt, '\0', sizeof(salt));
if (enif_get_string(env, argv[0], pw, sizeof(pw), ERL_NIF_LATIN1) < 1)
return enif_make_badarg(env);
if (enif_get_string(env, argv[1], salt, sizeof(salt), ERL_NIF_LATIN1) < 1)
return enif_make_badarg(env);
if (bcrypt(pw, salt, encrypted, sizeof(encrypted)) ||
0 == strcmp(encrypted, ":")) {
return enif_make_badarg(env);
}
return enif_make_string(env, encrypted, ERL_NIF_LATIN1);
}
static ErlNifFunc bcrypt_nif_funcs[] =
{
{"encode_salt", 2, erl_encode_salt},
{"hashpw", 2, hashpw}
};
ERL_NIF_INIT(Elixir.Comeonin.Bcrypt, bcrypt_nif_funcs, NULL, NULL, NULL, NULL)