1 files changed, 16 insertions, 70 deletions

diff --git a/thirdparty/mbedtls/library/entropy_poll.c b/thirdparty/mbedtls/library/entropy_poll.c
index f44a753f4d..4556f88a55 100644
--- a/thirdparty/mbedtls/library/entropy_poll.c
+++ b/thirdparty/mbedtls/library/entropy_poll.c
@@ -61,43 +61,28 @@
 #define _WIN32_WINNT 0x0400
 #endif
 #include <windows.h>
-#include <bcrypt.h>
-#if defined(_MSC_VER) && _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 defined(_MSC_VER) && _MSC_VER <= 1600
-#pragma warning( pop )
-#endif
+#include <wincrypt.h>
 
 int mbedtls_platform_entropy_poll( void *data, unsigned char *output, size_t len,
                            size_t *olen )
 {
-    ULONG len_as_ulong = 0;
+    HCRYPTPROV provider;
     ((void) data);
     *olen = 0;
 
-    /*
-     * BCryptGenRandom takes ULONG for size, which is smaller than size_t on
-     * 64-bit Windows platforms. Ensure len's value can be safely converted into
-     * a ULONG.
-     */
-    if ( FAILED( SizeTToULong( len, &len_as_ulong ) ) )
+    if( CryptAcquireContext( &provider, NULL, NULL,
+                              PROV_RSA_FULL, CRYPT_VERIFYCONTEXT ) == FALSE )
     {
         return( MBEDTLS_ERR_ENTROPY_SOURCE_FAILED );
     }
 
-    if ( !BCRYPT_SUCCESS( BCryptGenRandom( NULL, output, len_as_ulong, BCRYPT_USE_SYSTEM_PREFERRED_RNG ) ) )
+    if( CryptGenRandom( provider, (DWORD) len, output ) == FALSE )
     {
+        CryptReleaseContext( provider, 0 );
         return( MBEDTLS_ERR_ENTROPY_SOURCE_FAILED );
     }
 
+    CryptReleaseContext( provider, 0 );
     *olen = len;
 
     return( 0 );
@@ -114,6 +99,7 @@ int mbedtls_platform_entropy_poll( void *data, unsigned char *output, size_t len
 #include <sys/syscall.h>
 #if defined(SYS_getrandom)
 #define HAVE_GETRANDOM
+#include <errno.h>
 
 static int getrandom_wrapper( void *buf, size_t buflen, unsigned int flags )
 {
@@ -123,47 +109,8 @@ static int getrandom_wrapper( void *buf, size_t buflen, unsigned int flags )
     memset( buf, 0, buflen );
 #endif
 #endif
-
     return( syscall( SYS_getrandom, buf, buflen, flags ) );
 }
-
-#include <sys/utsname.h>
-/* Check if version is at least 3.17.0 */
-static int check_version_3_17_plus( void )
-{
-    int minor;
-    struct utsname un;
-    const char *ver;
-
-    /* Get version information */
-    uname(&un);
-    ver = un.release;
-
-    /* Check major version; assume a single digit */
-    if( ver[0] < '3' || ver[0] > '9' || ver [1] != '.' )
-        return( -1 );
-
-    if( ver[0] - '0' > 3 )
-        return( 0 );
-
-    /* Ok, so now we know major == 3, check minor.
-     * Assume 1 or 2 digits. */
-    if( ver[2] < '0' || ver[2] > '9' )
-        return( -1 );
-
-    minor = ver[2] - '0';
-
-    if( ver[3] >= '0' && ver[3] <= '9' )
-        minor = 10 * minor + ver[3] - '0';
-    else if( ver [3] != '.' )
-        return( -1 );
-
-    if( minor < 17 )
-        return( -1 );
-
-    return( 0 );
-}
-static int has_getrandom = -1;
 #endif /* SYS_getrandom */
 #endif /* __linux__ */
 
@@ -174,22 +121,21 @@ int mbedtls_platform_entropy_poll( void *data,
 {
     FILE *file;
     size_t read_len;
+    int ret;
     ((void) data);
 
 #if defined(HAVE_GETRANDOM)
-    if( has_getrandom == -1 )
-        has_getrandom = ( check_version_3_17_plus() == 0 );
-
-    if( has_getrandom )
+    ret = getrandom_wrapper( output, len, 0 );
+    if( ret >= 0 )
     {
-        int ret;
-
-        if( ( ret = getrandom_wrapper( output, len, 0 ) ) < 0 )
-            return( MBEDTLS_ERR_ENTROPY_SOURCE_FAILED );
-
         *olen = ret;
         return( 0 );
     }
+    else if( errno != ENOSYS )
+        return( MBEDTLS_ERR_ENTROPY_SOURCE_FAILED );
+    /* Fall through if the system call isn't known. */
+#else
+    ((void) ret);
 #endif /* HAVE_GETRANDOM */
 
     *olen = 0;