Move crypto_helpers from sync to base

crypto/random.h

Index: crypto/random.h
diff --git a/crypto/random.h b/crypto/random.h
new file mode 100644
index 0000000000000000000000000000000000000000..9366f1a7972f8e280f83f7c3857ad838fd00bcc3
--- /dev/null
+++ b/crypto/random.h
@@ -0,0 +1,14 @@
+// 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 CRYPTO_RANDOM_H_
+#define CRYPTO_RANDOM_H_
+#pragma once
+
+#include <string>
+
+void GetRandomBytes(char* output, int output_length);

[agl, 2011/04/26 13:59:37]

Needs a comment. The first argument should probably be a void* and the second a
size_t.

// GetRandomBytes fills |output_length| bytes of |output| with cryptographically
strong random data.

+std::string Generate128BitRandomHexString();

[agl, 2011/04/26 13:59:37]

// Generate128BitRandomHexString returns a string of length 32 containing
lower-case, hex encoded, cryptographically strong, random data.

+
+#endif  // CRYPTO_RANDOM_H_