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/*############################################################################
# Copyright 2016 Intel Corporation
#
# 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.
############################################################################*/
/*!
* \file
* \brief Pseudo random number generator interface.
*/
#ifndef EPID_COMMON_TESTHELPER_PRNG_TESTHELPER_H_
#define EPID_COMMON_TESTHELPER_PRNG_TESTHELPER_H_
#if defined(_WIN32) || defined(_WIN64)
#define __STDCALL __stdcall
#else
#define __STDCALL
#endif
#include <limits.h> // for CHAR_BIT
#include <random>
/// Return status for Prng Generate function
typedef enum {
kPrngNoErr = 0, //!< no error
kPrngErr = -999, //!< unspecified error
kPrngNotImpl, //!< not implemented error
kPrngBadArgErr //!< incorrect arg to function
} PrngStatus;
/// Pseudo random number generator (prng) class.
class Prng {
public:
Prng() : seed_(1) { set_seed(seed_); }
~Prng() {}
/// Retrieve seed
unsigned int get_seed() const { return seed_; }
/// Set seed for random number generator
void set_seed(unsigned int val) {
seed_ = val;
generator_.seed(seed_);
}
/// Generates random number
static int __STDCALL Generate(unsigned int* random_data, int num_bits,
void* user_data) {
unsigned int num_bytes = num_bits / CHAR_BIT;
int num_words = num_bytes / sizeof(unsigned int);
if (!random_data) {
return kPrngBadArgErr;
}
if (num_bits <= 0) {
return kPrngBadArgErr;
}
if (num_bytes < sizeof(unsigned int) ||
num_bytes % sizeof(unsigned int) != 0) {
return kPrngBadArgErr;
}
Prng* myprng = (Prng*)user_data;
std::uniform_int_distribution<> dis(0x0, 0xffff);
for (int n = 0; n < num_words; n++) {
random_data[n] =
(dis(myprng->generator_) << 16) + dis(myprng->generator_);
}
return kPrngNoErr;
}
private:
unsigned int seed_;
std::mt19937 generator_;
};
#endif // EPID_COMMON_TESTHELPER_PRNG_TESTHELPER_H_
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