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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 "rand.h"
#include "bn.h"
ERL_NIF_TERM strong_rand_bytes_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
{/* (Bytes) */
unsigned bytes;
unsigned char* data;
ERL_NIF_TERM ret;
if (!enif_get_uint(env, argv[0], &bytes)) {
return enif_make_badarg(env);
}
data = enif_make_new_binary(env, bytes, &ret);
if ( RAND_bytes(data, bytes) != 1) {
return atom_false;
}
ERL_VALGRIND_MAKE_MEM_DEFINED(data, bytes);
return ret;
}
ERL_NIF_TERM strong_rand_range_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
{/* (Range) */
BIGNUM *bn_range, *bn_rand;
ERL_NIF_TERM ret;
if(!get_bn_from_bin(env, argv[0], &bn_range)) {
return enif_make_badarg(env);
}
bn_rand = BN_new();
if (BN_rand_range(bn_rand, bn_range) != 1) {
ret = atom_false;
}
else {
ret = bin_from_bn(env, bn_rand);
}
BN_free(bn_rand);
BN_free(bn_range);
return ret;
}
ERL_NIF_TERM rand_uniform_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
{/* (Lo,Hi) */
BIGNUM *bn_from = NULL, *bn_to, *bn_rand;
unsigned char* data;
unsigned dlen;
ERL_NIF_TERM ret;
if (!get_bn_from_mpint(env, argv[0], &bn_from)
|| !get_bn_from_mpint(env, argv[1], &bn_rand)) {
if (bn_from) BN_free(bn_from);
return enif_make_badarg(env);
}
bn_to = BN_new();
BN_sub(bn_to, bn_rand, bn_from);
BN_pseudo_rand_range(bn_rand, bn_to);
BN_add(bn_rand, bn_rand, bn_from);
dlen = BN_num_bytes(bn_rand);
data = enif_make_new_binary(env, dlen+4, &ret);
put_int32(data, dlen);
BN_bn2bin(bn_rand, data+4);
ERL_VALGRIND_MAKE_MEM_DEFINED(data+4, dlen);
BN_free(bn_rand);
BN_free(bn_from);
BN_free(bn_to);
return ret;
}
ERL_NIF_TERM rand_seed_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
{
ErlNifBinary seed_bin;
if (!enif_inspect_binary(env, argv[0], &seed_bin))
return enif_make_badarg(env);
RAND_seed(seed_bin.data,seed_bin.size);
return atom_ok;
}
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