57 lines
1.8 KiB
Diff
57 lines
1.8 KiB
Diff
Backported from: https://github.com/Mbed-TLS/mbedtls/pull/8047
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diff --git a/thirdparty/mbedtls/library/entropy_poll.c b/thirdparty/mbedtls/library/entropy_poll.c
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index cde49e66a0..4c5184686e 100644
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--- a/thirdparty/mbedtls/library/entropy_poll.c
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+++ b/thirdparty/mbedtls/library/entropy_poll.c
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@@ -39,32 +39,34 @@
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#if defined(_WIN32) && !defined(EFIX64) && !defined(EFI32)
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-#if !defined(_WIN32_WINNT)
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-#define _WIN32_WINNT 0x0400
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-#endif
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#include <windows.h>
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-#include <wincrypt.h>
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+#include <bcrypt.h>
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+#include <intsafe.h>
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int mbedtls_platform_entropy_poll(void *data, unsigned char *output, size_t len,
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size_t *olen)
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{
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- HCRYPTPROV provider;
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((void) data);
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*olen = 0;
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- if (CryptAcquireContext(&provider, NULL, NULL,
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- PROV_RSA_FULL, CRYPT_VERIFYCONTEXT) == FALSE) {
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- return MBEDTLS_ERR_ENTROPY_SOURCE_FAILED;
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- }
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+ /*
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+ * BCryptGenRandom takes ULONG for size, which is smaller than size_t on
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+ * 64-bit Windows platforms. Extract entropy in chunks of len (dependent
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+ * on ULONG_MAX) size.
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+ */
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+ while (len != 0) {
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+ unsigned long ulong_bytes =
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+ (len > ULONG_MAX) ? ULONG_MAX : (unsigned long) len;
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+
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+ if (!BCRYPT_SUCCESS(BCryptGenRandom(NULL, output, ulong_bytes,
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+ BCRYPT_USE_SYSTEM_PREFERRED_RNG))) {
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+ return MBEDTLS_ERR_ENTROPY_SOURCE_FAILED;
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+ }
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- if (CryptGenRandom(provider, (DWORD) len, output) == FALSE) {
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- CryptReleaseContext(provider, 0);
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- return MBEDTLS_ERR_ENTROPY_SOURCE_FAILED;
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+ *olen += ulong_bytes;
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+ len -= ulong_bytes;
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}
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- CryptReleaseContext(provider, 0);
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- *olen = len;
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-
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return 0;
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}
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#else /* _WIN32 && !EFIX64 && !EFI32 */
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