76 lines
2.9 KiB
C
76 lines
2.9 KiB
C
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/*
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* Copyright 2014 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef WEBRTC_PC_EXTERNALHMAC_H_
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#define WEBRTC_PC_EXTERNALHMAC_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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extern "C" {
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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/srtp/crypto/include/auth.h"
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#endif // SRTP_RELATIVE_PATH
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}
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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_t 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 // WEBRTC_PC_EXTERNALHMAC_H_
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