Move talk/session/media -> webrtc/pc

talk/session/media/externalhmac.h

-/*
- * libjingle
- * Copyright 2014 Google Inc.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- *
- *  1. Redistributions of source code must retain the above copyright notice,
- *     this list of conditions and the following disclaimer.
- *  2. Redistributions in binary form must reproduce the above copyright notice,
- *     this list of conditions and the following disclaimer in the documentation
- *     and/or other materials provided with the distribution.
- *  3. The name of the author may not be used to endorse or promote products
- *     derived from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
- * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
- * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
- * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
- * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
- * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
- * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#ifndef TALK_SESSION_MEDIA_EXTERNAL_HMAC_H_
-#define TALK_SESSION_MEDIA_EXTERNAL_HMAC_H_
-
-// External libsrtp HMAC auth module which implements methods defined in
-// auth_type_t.
-// The default auth module will be replaced only when the ENABLE_EXTERNAL_AUTH
-// flag is enabled. This allows us to access to authentication keys,
-// as the default auth implementation doesn't provide access and avoids
-// hashing each packet twice.
-
-// How will libsrtp select this module?
-// Libsrtp defines authentication function types identified by an unsigned
-// integer, e.g. HMAC_SHA1 is 3. Using authentication ids, the application
-// can plug any desired authentication modules into libsrtp.
-// libsrtp also provides a mechanism to select different auth functions for
-// individual streams. This can be done by setting the right value in
-// the auth_type of srtp_policy_t. The application must first register auth
-// functions and the corresponding authentication id using
-// crypto_kernel_replace_auth_type function.
-#if defined(HAVE_SRTP) && defined(ENABLE_EXTERNAL_AUTH)
-
-#include "webrtc/base/basictypes.h"
-extern "C" {
-#ifdef SRTP_RELATIVE_PATH
-#include "auth.h"  // NOLINT
-#else
-#include "third_party/libsrtp/srtp/crypto/include/auth.h"
-#endif  // SRTP_RELATIVE_PATH
-}
-
-#define EXTERNAL_HMAC_SHA1 HMAC_SHA1 + 1
-#define HMAC_KEY_LENGTH 20
-
-// The HMAC context structure used to store authentication keys.
-// The pointer to the key  will be allocated in the external_hmac_init function.
-// This pointer is owned by srtp_t in a template context.
-typedef struct {
-  uint8_t key[HMAC_KEY_LENGTH];
-  int key_length;
-} ExternalHmacContext;
-
-err_status_t external_hmac_alloc(auth_t** a, int key_len, int out_len);
-
-err_status_t external_hmac_dealloc(auth_t* a);
-
-err_status_t external_hmac_init(ExternalHmacContext* state,
-                                const uint8_t* key,
-                                int key_len);
-
-err_status_t external_hmac_start(ExternalHmacContext* state);
-
-err_status_t external_hmac_update(ExternalHmacContext* state,
-                                  const uint8_t* message,
-                                  int msg_octets);
-
-err_status_t external_hmac_compute(ExternalHmacContext* state,
-                                   const void* message,
-                                   int msg_octets,
-                                   int tag_len,
-                                   uint8_t* result);
-
-err_status_t external_crypto_init();
-
-#endif  // defined(HAVE_SRTP) && defined(ENABLE_EXTERNAL_AUTH)
-#endif  // TALK_SESSION_MEDIA_EXTERNAL_HMAC_H_