rand.c

 
#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);
}