Adds a base32 component.

components/base32/base32.h

Index: components/base32/base32.h
diff --git a/components/base32/base32.h b/components/base32/base32.h
new file mode 100644
index 0000000000000000000000000000000000000000..58bc58135344e1b89abab9a922e21ca592e89c36
--- /dev/null
+++ b/components/base32/base32.h
@@ -0,0 +1,34 @@
+// Copyright 2016 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 COMPONENTS_BASE32_BASE32_H_
+#define COMPONENTS_BASE32_BASE32_H_
+
+#include <string>
+
+#include "base/strings/string_piece.h"
+
+namespace base32 {
+
+enum class Base32EncodePolicy {
+  // Include the trailing padding in the output, when necessary.
+  INCLUDE_PADDING,
+  // Omit trailing padding in the output. Such an output will not be decodable
+  // unless |input.size()| is known by the decoder. Its size is guaranteed to be
+  // |ceil(input.size() * 8.0 / 5.0)|.
+  OMIT_PADDING
+};
+
+// Encodes the |input| string in base32, defined in RFC 4648:
+// https://tools.ietf.org/html/rfc4648#section-5
+//
+// The |policy| defines whether padding should be included or omitted from the
+// encoded output.
+std::string Base32Encode(
+    base::StringPiece input,
+    Base32EncodePolicy policy = Base32EncodePolicy::INCLUDE_PADDING);
+
+}  // namespace base32
+
+#endif  // COMPONENTS_BASE32_BASE32_H_