Adam Barth
54d59f1275
The new version of zx_cprng_draw either succeeds in reading the requested amount of data or fails entirely. A future CL will rename zx_cprng_draw_new to zx_cprng_draw once zx_cprng_draw has this new behavior. Change-Id: I08acad6a3443cb295f7855afdd63010dcf872820 Reviewed-on: https://dart-review.googlesource.com/59861 Reviewed-by: Zach Anderson <zra@google.com> Commit-Queue: Adam Barth <abarth@google.com>
34 lines
866 B
C++
34 lines
866 B
C++
// Copyright (c) 2016, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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#include "platform/globals.h"
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#if defined(HOST_OS_FUCHSIA)
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#include "bin/crypto.h"
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#include <zircon/syscalls.h>
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namespace dart {
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namespace bin {
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bool Crypto::GetRandomBytes(intptr_t count, uint8_t* buffer) {
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intptr_t read = 0;
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while (read < count) {
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const intptr_t remaining = count - read;
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const intptr_t len =
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(ZX_CPRNG_DRAW_MAX_LEN < remaining) ? ZX_CPRNG_DRAW_MAX_LEN : remaining;
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const zx_status_t status = zx_cprng_draw_new(buffer + read, len);
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if (status != ZX_OK) {
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return false;
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}
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read += len;
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}
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return true;
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}
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} // namespace bin
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} // namespace dart
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#endif // defined(HOST_OS_FUCHSIA)
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