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Import PR 730 from mbedTLS project

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Fixes UWP build while we wait for it to get into next release.
This commit is contained in:
Fabio Alessandrelli
2018-02-20 09:35:52 +01:00
parent a2ef49f8b9
commit a929a5aea5
2 changed files with 41 additions and 9 deletions
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27
thirdparty/mbedtls/library/entropy_poll.c vendored
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@@ -54,28 +54,41 @@
#define _WIN32_WINNT 0x0400
#endif
#include <windows.h>
#include <wincrypt.h>
#include <bcrypt.h>
#if _MSC_VER <= 1600
/* Visual Studio 2010 and earlier issue a warning when both <stdint.h> and <intsafe.h> are included, as they
* redefine a number of <TYPE>_MAX constants. These constants are guaranteed to be the same, though, so
* we suppress the warning when including intsafe.h.
*/
#pragma warning( push )
#pragma warning( disable : 4005 )
#endif
#include <intsafe.h>
#if _MSC_VER <= 1600
#pragma warning( pop )
#endif
int mbedtls_platform_entropy_poll( void *data, unsigned char *output, size_t len,
size_t *olen )
{
HCRYPTPROV provider;
ULONG len_as_ulong = 0;
((void) data);
*olen = 0;
if( CryptAcquireContext( &provider, NULL, NULL,
PROV_RSA_FULL, CRYPT_VERIFYCONTEXT ) == FALSE )
/*
* BCryptGenRandom takes ULONG for size, which is smaller than size_t on 64-bit platforms.
* Ensure len's value can be safely converted into a ULONG.
*/
if ( FAILED( SizeTToULong( len, &len_as_ulong ) ) )
{
return( MBEDTLS_ERR_ENTROPY_SOURCE_FAILED );
}
if( CryptGenRandom( provider, (DWORD) len, output ) == FALSE )
if ( !BCRYPT_SUCCESS( BCryptGenRandom( NULL, output, len_as_ulong, BCRYPT_USE_SYSTEM_PREFERRED_RNG ) ) )
{
CryptReleaseContext( provider, 0 );
return( MBEDTLS_ERR_ENTROPY_SOURCE_FAILED );
}
CryptReleaseContext( provider, 0 );
*olen = len;
return( 0 );