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/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 2010-2018. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* %CopyrightEnd%
*/
#include "hmac.h"
#include "digest.h"
ErlNifResourceType* hmac_context_rtype;
ERL_NIF_TERM hmac_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
{/* (Type, Key, Data) or (Type, Key, Data, MacSize) */
struct digest_type_t *digp = NULL;
ErlNifBinary key, data;
unsigned char buff[EVP_MAX_MD_SIZE];
unsigned size = 0, req_size = 0;
ERL_NIF_TERM ret;
digp = get_digest_type(argv[0]);
if (!digp ||
!enif_inspect_iolist_as_binary(env, argv[1], &key) ||
!enif_inspect_iolist_as_binary(env, argv[2], &data) ||
(argc == 4 && !enif_get_uint(env, argv[3], &req_size))) {
return enif_make_badarg(env);
}
if (!digp->md.p ||
!HMAC(digp->md.p,
key.data, key.size,
data.data, data.size,
buff, &size)) {
return atom_notsup;
}
ASSERT(0 < size && size <= EVP_MAX_MD_SIZE);
CONSUME_REDS(env, data);
if (argc == 4) {
if (req_size <= size) {
size = req_size;
}
else {
return enif_make_badarg(env);
}
}
memcpy(enif_make_new_binary(env, size, &ret), buff, size);
return ret;
}
void hmac_context_dtor(ErlNifEnv* env, struct hmac_context *obj)
{
if (obj->alive) {
HMAC_CTX_free(obj->ctx);
obj->alive = 0;
}
enif_mutex_destroy(obj->mtx);
}
ERL_NIF_TERM hmac_init_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
{/* (Type, Key) */
struct digest_type_t *digp = NULL;
ErlNifBinary key;
ERL_NIF_TERM ret;
struct hmac_context *obj;
digp = get_digest_type(argv[0]);
if (!digp ||
!enif_inspect_iolist_as_binary(env, argv[1], &key)) {
return enif_make_badarg(env);
}
if (!digp->md.p) {
return atom_notsup;
}
obj = enif_alloc_resource(hmac_context_rtype, sizeof(struct hmac_context));
obj->mtx = enif_mutex_create("crypto.hmac");
obj->alive = 1;
obj->ctx = HMAC_CTX_new();
#if OPENSSL_VERSION_NUMBER >= PACKED_OPENSSL_VERSION_PLAIN(1,0,0)
// Check the return value of HMAC_Init: it may fail in FIPS mode
// for disabled algorithms
if (!HMAC_Init_ex(obj->ctx, key.data, key.size, digp->md.p, NULL)) {
enif_release_resource(obj);
return atom_notsup;
}
#else
HMAC_Init_ex(obj->ctx, key.data, key.size, digp->md.p, NULL);
#endif
ret = enif_make_resource(env, obj);
enif_release_resource(obj);
return ret;
}
ERL_NIF_TERM hmac_update_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
{/* (Context, Data) */
ErlNifBinary data;
struct hmac_context* obj;
if (!enif_get_resource(env, argv[0], hmac_context_rtype, (void**)&obj)
|| !enif_inspect_iolist_as_binary(env, argv[1], &data)) {
return enif_make_badarg(env);
}
enif_mutex_lock(obj->mtx);
if (!obj->alive) {
enif_mutex_unlock(obj->mtx);
return enif_make_badarg(env);
}
HMAC_Update(obj->ctx, data.data, data.size);
enif_mutex_unlock(obj->mtx);
CONSUME_REDS(env,data);
return argv[0];
}
ERL_NIF_TERM hmac_final_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
{/* (Context) or (Context, HashLen) */
ERL_NIF_TERM ret;
struct hmac_context* obj;
unsigned char mac_buf[EVP_MAX_MD_SIZE];
unsigned char * mac_bin;
unsigned int req_len = 0;
unsigned int mac_len;
if (!enif_get_resource(env,argv[0],hmac_context_rtype, (void**)&obj)
|| (argc == 2 && !enif_get_uint(env, argv[1], &req_len))) {
return enif_make_badarg(env);
}
enif_mutex_lock(obj->mtx);
if (!obj->alive) {
enif_mutex_unlock(obj->mtx);
return enif_make_badarg(env);
}
HMAC_Final(obj->ctx, mac_buf, &mac_len);
HMAC_CTX_free(obj->ctx);
obj->alive = 0;
enif_mutex_unlock(obj->mtx);
if (argc == 2 && req_len < mac_len) {
/* Only truncate to req_len bytes if asked. */
mac_len = req_len;
}
mac_bin = enif_make_new_binary(env, mac_len, &ret);
memcpy(mac_bin, mac_buf, mac_len);
return ret;
}
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