Add an initial crypto interface to fill a given buffer with random data. This

has the same implementation as the WebKit one on ChromeOS.

TEST=none
BUG=none
Review URL: http://codereview.chromium.org/6880053

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@82291 0039d316-1c4b-4281-b951-d872f2087c98

2 files changed, 47 insertions, 0 deletions

diff --git a/ppapi/shared_impl/crypto_impl.cc b/ppapi/shared_impl/crypto_impl.cc
new file mode 100644
index 0000000..6295bb2
--- /dev/null
+++ b/ppapi/shared_impl/crypto_impl.cc
@@ -0,0 +1,25 @@
+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "ppapi/shared_impl/crypto_impl.h"
+
+#include "base/rand_util.h"
+
+namespace pp {
+namespace shared_impl {
+
+// static
+void CryptoImpl::GetRandomBytes(char* buffer, uint32_t num_bytes) {
+  // Note: this is a copy of WebKitClientImpl::cryptographicallyRandomValues.
+  uint64 bytes = 0;
+  for (uint32_t i = 0; i < num_bytes; ++i) {
+    uint32_t offset = i % sizeof(bytes);
+    if (!offset)
+      bytes = base::RandUint64();
+    buffer[i] = reinterpret_cast<char*>(&bytes)[offset];
+  }
+}
+
+}  // namespace shared_impl
+}  // namespace pp
diff --git a/ppapi/shared_impl/crypto_impl.h b/ppapi/shared_impl/crypto_impl.h
new file mode 100644
index 0000000..c3b3cd4
--- /dev/null
+++ b/ppapi/shared_impl/crypto_impl.h
@@ -0,0 +1,22 @@
+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef PPAPI_SHARED_IMPL_CRYPTO_IMPL_H_
+#define PPAPI_SHARED_IMPL_CRYPTO_IMPL_H_
+
+#include "ppapi/c/pp_bool.h"
+#include "ppapi/c/pp_stdint.h"
+
+namespace pp {
+namespace shared_impl {
+
+class CryptoImpl {
+ public:
+  static void GetRandomBytes(char* buffer, uint32_t num_bytes);
+};
+
+}  // namespace shared_impl
+}  // namespace pp
+
+#endif  // PPAPI_SHARED_IMPL_CRYPTO_IMPL_H_