html_viewer: Move webcrypto to a place where html_viewer can use it.

content/child/webcrypto/openssl/rsa_sign_openssl.h

-// Copyright 2014 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 CONTENT_CHILD_WEBCRYPTO_OPENSSL_RSA_SIGN_OPENSSL_H_
-#define CONTENT_CHILD_WEBCRYPTO_OPENSSL_RSA_SIGN_OPENSSL_H_
-
-#include <stdint.h>
-
-#include <vector>
-
-namespace blink {
-class WebCryptoKey;
-}
-
-namespace content {
-
-namespace webcrypto {
-
-class CryptoData;
-class Status;
-
-// Helper functions for doing RSA-SSA signing and verification
-// (both PKCS1-v1_5 and PSS flavor).
-//
-// The salt length parameter is only relevant when the key is for RSA-PSS. In
-// other cases it should be set to zero.
-
-Status RsaSign(const blink::WebCryptoKey& key,
-               unsigned int pss_salt_length_bytes,
-               const CryptoData& data,
-               std::vector<uint8_t>* buffer);
-
-Status RsaVerify(const blink::WebCryptoKey& key,
-                 unsigned int pss_salt_length_bytes,
-                 const CryptoData& signature,
-                 const CryptoData& data,
-                 bool* signature_match);
-
-}  // namespace webcrypto
-
-}  // namespace content
-
-#endif  // CONTENT_CHILD_WEBCRYPTO_OPENSSL_RSA_SIGN_OPENSSL_H_