a9cf079248
_t types are reserved by POSIX. R=juberti@webrtc.org BUG=162 Review URL: https://webrtc-codereview.appspot.com/33699004 git-svn-id: http://webrtc.googlecode.com/svn/trunk@7944 4adac7df-926f-26a2-2b94-8c16560cd09d
91 lines
3.9 KiB
C
91 lines
3.9 KiB
C
/*
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* libjingle
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* Copyright 2014 Google Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef TALK_SESSION_MEDIA_EXTERNAL_HMAC_H_
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#define TALK_SESSION_MEDIA_EXTERNAL_HMAC_H_
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// External libsrtp HMAC auth module which implements methods defined in
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// auth_type_t.
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// The default auth module will be replaced only when the ENABLE_EXTERNAL_AUTH
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// flag is enabled. This allows us to access to authentication keys,
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// as the default auth implementation doesn't provide access and avoids
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// hashing each packet twice.
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// How will libsrtp select this module?
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// Libsrtp defines authentication function types identified by an unsigned
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// integer, e.g. HMAC_SHA1 is 3. Using authentication ids, the application
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// can plug any desired authentication modules into libsrtp.
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// libsrtp also provides a mechanism to select different auth functions for
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// individual streams. This can be done by setting the right value in
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// the auth_type of srtp_policy_t. The application must first register auth
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// functions and the corresponding authentication id using
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// crypto_kernel_replace_auth_type function.
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#if defined(HAVE_SRTP) && defined(ENABLE_EXTERNAL_AUTH)
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#include "webrtc/base/basictypes.h"
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#ifdef SRTP_RELATIVE_PATH
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#include "auth.h" // NOLINT
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#else
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#include "third_party/libsrtp/crypto/include/auth.h"
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#endif // SRTP_RELATIVE_PATH
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#define EXTERNAL_HMAC_SHA1 HMAC_SHA1 + 1
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#define HMAC_KEY_LENGTH 20
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// The HMAC context structure used to store authentication keys.
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// The pointer to the key will be allocated in the external_hmac_init function.
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// This pointer is owned by srtp_t in a template context.
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typedef struct {
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uint8 key[HMAC_KEY_LENGTH];
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int key_length;
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} ExternalHmacContext;
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err_status_t external_hmac_alloc(auth_t** a, int key_len, int out_len);
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err_status_t external_hmac_dealloc(auth_t* a);
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err_status_t external_hmac_init(ExternalHmacContext* state,
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const uint8_t* key,
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int key_len);
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err_status_t external_hmac_start(ExternalHmacContext* state);
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err_status_t external_hmac_update(ExternalHmacContext* state,
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const uint8_t* message,
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int msg_octets);
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err_status_t external_hmac_compute(ExternalHmacContext* state,
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const void* message,
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int msg_octets,
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int tag_len,
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uint8_t* result);
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err_status_t external_crypto_init();
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#endif // defined(HAVE_SRTP) && defined(ENABLE_EXTERNAL_AUTH)
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#endif // TALK_SESSION_MEDIA_EXTERNAL_HMAC_H_
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