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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef REMOTING_PROTOCOL_AUTH_UTIL_H_
#define REMOTING_PROTOCOL_AUTH_UTIL_H_
#include <stddef.h>
#include <string>
#include <string_view>
namespace net {
class SSLSocket;
} // namespace net
namespace remoting::protocol {
// Labels for use when exporting the SSL shared secret.
extern const char kClientAuthSslExporterLabel[];
extern const char kHostAuthSslExporterLabel[];
// Fake hostname used for SSL connections.
extern const char kSslFakeHostName[];
// Size of the HMAC-SHA-256 hash used as shared secret in SPAKE2.
const size_t kSharedSecretHashLength = 32;
// Size of the HMAC-SHA-256 digest used for channel authentication.
const size_t kAuthDigestLength = 32;
// Returns HMAC-SHA-256 hash for |shared_secret| with the specified |tag|.
std::string GetSharedSecretHash(const std::string& tag,
const std::string& shared_secret);
// Returns authentication bytes that must be used for the given
// |socket|. Empty string is returned in case of failure.
std::string GetAuthBytes(net::SSLSocket* socket,
const std::string_view& label,
const std::string_view& shared_secret);
} // namespace remoting::protocol
#endif // REMOTING_PROTOCOL_AUTH_UTIL_H_
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