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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;
ASSERT(argc == 1);
if (!enif_get_uint(env, argv[0], &bytes))
goto bad_arg;
if (bytes > INT_MAX)
goto bad_arg;
if ((data = enif_make_new_binary(env, bytes, &ret)) == NULL)
goto err;
if (RAND_bytes(data, (int)bytes) != 1)
goto err;
ERL_VALGRIND_MAKE_MEM_DEFINED(data, bytes);
return ret;
bad_arg:
return enif_make_badarg(env);
err:
return atom_false;
}
ERL_NIF_TERM strong_rand_range_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
{/* (Range) */
BIGNUM *bn_range = NULL, *bn_rand = NULL;
ERL_NIF_TERM ret;
ASSERT(argc == 1);
if (!get_bn_from_bin(env, argv[0], &bn_range))
goto bad_arg;
if ((bn_rand = BN_new()) == NULL)
goto err;
if (!BN_rand_range(bn_rand, bn_range))
goto err;
if ((ret = bin_from_bn(env, bn_rand)) == atom_error)
goto err;
goto done;
bad_arg:
return enif_make_badarg(env);
err:
ret = atom_false;
done:
if (bn_rand)
BN_free(bn_rand);
if (bn_range)
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 = NULL, *bn_rand = NULL;
unsigned char* data;
int dlen;
ERL_NIF_TERM ret;
ASSERT(argc == 2);
if (!get_bn_from_mpint(env, argv[0], &bn_from))
goto bad_arg;
if (!get_bn_from_mpint(env, argv[1], &bn_rand))
goto bad_arg;
if ((bn_to = BN_new()) == NULL)
goto err;
if (!BN_sub(bn_to, bn_rand, bn_from))
goto err;
if (!BN_pseudo_rand_range(bn_rand, bn_to))
goto err;
if (!BN_add(bn_rand, bn_rand, bn_from))
goto err;
if ((dlen = BN_num_bytes(bn_rand)) < 0)
goto err;
if ((data = enif_make_new_binary(env, (size_t)dlen+4, &ret)) == NULL)
goto err;
put_uint32(data, (unsigned int)dlen);
BN_bn2bin(bn_rand, data+4);
ERL_VALGRIND_MAKE_MEM_DEFINED(data+4, dlen);
goto done;
bad_arg:
err:
ret = enif_make_badarg(env);
done:
if (bn_rand)
BN_free(bn_rand);
if (bn_from)
BN_free(bn_from);
if (bn_to)
BN_free(bn_to);
return ret;
}
ERL_NIF_TERM rand_seed_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
{/* (Seed) */
ErlNifBinary seed_bin;
ASSERT(argc == 1);
if (!enif_inspect_binary(env, argv[0], &seed_bin))
goto bad_arg;
if (seed_bin.size > INT_MAX)
goto bad_arg;
RAND_seed(seed_bin.data, (int)seed_bin.size);
return atom_ok;
bad_arg:
return enif_make_badarg(env);
}
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