Adding upstream version 1.17.13.upstream/1.17.13upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 26 insertions, 0 deletions

diff --git a/src/crypto/rand/rand_windows.go b/src/crypto/rand/rand_windows.go
new file mode 100644
index 0000000..6c0655c
--- /dev/null
+++ b/src/crypto/rand/rand_windows.go
@@ -0,0 +1,26 @@
+// Copyright 2010 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Windows cryptographically secure pseudorandom number
+// generator.
+
+package rand
+
+import (
+	"internal/syscall/windows"
+)
+
+func init() { Reader = &rngReader{} }
+
+type rngReader struct{}
+
+func (r *rngReader) Read(b []byte) (n int, err error) {
+	// RtlGenRandom only returns 1<<32-1 bytes at a time. We only read at
+	// most 1<<31-1 bytes at a time so that  this works the same on 32-bit
+	// and 64-bit systems.
+	if err := batched(windows.RtlGenRandom, 1<<31-1)(b); err != nil {
+		return 0, err
+	}
+	return len(b), nil
+}