Zachary Anderson
e476e00ca6
There is now a syscall for getting cryptographically secure random bytes. R=asiva@google.com Review URL: https://codereview.chromium.org/2204523002 .
35 lines
915 B
C++
35 lines
915 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(TARGET_OS_FUCHSIA)
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#include "bin/crypto.h"
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#include <magenta/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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(MX_CPRNG_DRAW_MAX_LEN < remaining) ? MX_CPRNG_DRAW_MAX_LEN
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: remaining;
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const mx_ssize_t res = mx_cprng_draw(buffer + read, len);
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if (res == ERR_INVALID_ARGS) {
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return false;
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}
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read += res;
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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(TARGET_OS_FUCHSIA)
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