/**

 * WinPR: Windows Portable Runtime

 *

 * Copyright 2015 Marc-Andre Moreau <marcandre.moreau@gmail.com>

 *

 * 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.

 */

#include <winpr/config.h>

#include <winpr/crt.h>

#include <winpr/crypto.h>

#ifdef WITH_OPENSSL

#include <openssl/crypto.h>

#include <openssl/rand.h>

#endif

#ifdef WITH_MBEDTLS

#include <mbedtls/md.h>

#include <mbedtls/entropy.h>

#ifdef MBEDTLS_HAVEGE_C

#include <mbedtls/havege.h>

#endif

#include <mbedtls/hmac_drbg.h>

#endif

int winpr_RAND(void* output, size_t len)

{

#if defined(WITH_OPENSSL)

  if (len > INT_MAX)

    return -1;

  if (RAND_bytes(output, (int)len) != 1)

    return -1;

#elif defined(WITH_MBEDTLS)

#if defined(MBEDTLS_HAVEGE_C)

  mbedtls_havege_state hs;

  mbedtls_havege_init(&hs);

  if (mbedtls_havege_random(&hs, output, len) != 0)

    return -1;

  mbedtls_havege_free(&hs);

#else

  int status;

  mbedtls_entropy_context entropy;

  mbedtls_hmac_drbg_context hmac_drbg;

  const mbedtls_md_info_t* md_info;

  mbedtls_entropy_init(&entropy);

  mbedtls_hmac_drbg_init(&hmac_drbg);

  md_info = mbedtls_md_info_from_type(MBEDTLS_MD_SHA256);

  if ((status = mbedtls_hmac_drbg_seed(&hmac_drbg, md_info, mbedtls_entropy_func, &entropy, NULL,

                                       0)) != 0)

    return -1;

  status = mbedtls_hmac_drbg_random(&hmac_drbg, output, len);

  mbedtls_hmac_drbg_free(&hmac_drbg);

  mbedtls_entropy_free(&entropy);

  if (status != 0)

    return -1;

#endif

#endif

  return 0;

}

int winpr_RAND_pseudo(void* output, size_t len)

{

  return winpr_RAND(output, len);

}