webrtc/talk/session/media/externalhmac.cc
henrike@webrtc.org d43aa9de7a Update libjingle 61901702->61966318
git-svn-id: http://webrtc.googlecode.com/svn/trunk@5596 4adac7df-926f-26a2-2b94-8c16560cd09d
2014-02-21 23:43:24 +00:00

187 lines
5.7 KiB
C++

/*
* 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.
*/
#if defined(HAVE_SRTP) && defined(ENABLE_EXTERNAL_AUTH)
#ifdef SRTP_RELATIVE_PATH
#include "srtp.h" // NOLINT
#else
#include "third_party/libsrtp/include/srtp.h"
#endif // SRTP_RELATIVE_PATH
#include "talk/session/media/externalhmac.h"
#include "talk/base/logging.h"
// The debug module for authentiation
debug_module_t mod_external_hmac = {
0, // Debugging is off by default
(char*)"external-hmac-sha-1" // Printable name for module
};
extern auth_type_t external_hmac;
// Begin test case 0 */
uint8_t
external_hmac_test_case_0_key[20] = {
0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b,
0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b,
0x0b, 0x0b, 0x0b, 0x0b
};
uint8_t
external_hmac_test_case_0_data[8] = {
0x48, 0x69, 0x20, 0x54, 0x68, 0x65, 0x72, 0x65 // "Hi There"
};
uint8_t
external_hmac_fake_tag[10] = {
0xba, 0xdd, 0xba, 0xdd, 0xba, 0xdd, 0xba, 0xdd, 0xba, 0xdd
};
auth_test_case_t
external_hmac_test_case_0 = {
20, // Octets in key
external_hmac_test_case_0_key, // Key
8, // Octets in data
external_hmac_test_case_0_data, // Data
10, // Octets in tag
external_hmac_fake_tag, // Tag
NULL // Pointer to next testcase
};
err_status_t
external_hmac_alloc(auth_t** a, int key_len, int out_len) {
uint8_t* pointer;
// Check key length - note that we don't support keys larger
// than 20 bytes yet
if (key_len > 20)
return err_status_bad_param;
// Check output length - should be less than 20 bytes/
if (out_len > 20)
return err_status_bad_param;
// Allocate memory for auth and hmac_ctx_t structures.
pointer = reinterpret_cast<uint8_t*>(
crypto_alloc(sizeof(external_hmac_ctx_t) + sizeof(auth_t)));
if (pointer == NULL)
return err_status_alloc_fail;
// Set pointers
*a = (auth_t *)pointer;
(*a)->type = &external_hmac;
(*a)->state = pointer + sizeof(auth_t);
(*a)->out_len = out_len;
(*a)->key_len = key_len;
(*a)->prefix_len = 0;
// Increment global count of all hmac uses.
external_hmac.ref_count++;
return err_status_ok;
}
err_status_t
external_hmac_dealloc(auth_t* a) {
// Zeroize entire state
octet_string_set_to_zero((uint8_t *)a,
sizeof(external_hmac_ctx_t) + sizeof(auth_t));
// Free memory
crypto_free(a);
// Decrement global count of all hmac uses.
external_hmac.ref_count--;
return err_status_ok;
}
err_status_t
external_hmac_init(external_hmac_ctx_t* state,
const uint8_t* key, int key_len) {
if (key_len > HMAC_KEY_LENGTH)
return err_status_bad_param;
memset(state->key, 0, key_len);
memcpy(state->key, key, key_len);
state->key_length = key_len;
return err_status_ok;
}
err_status_t
external_hmac_start(external_hmac_ctx_t* state) {
return err_status_ok;
}
err_status_t
external_hmac_update(external_hmac_ctx_t* state, const uint8_t* message,
int msg_octets) {
return err_status_ok;
}
err_status_t
external_hmac_compute(external_hmac_ctx_t* state, const void* message,
int msg_octets, int tag_len, uint8_t* result) {
memcpy(result, external_hmac_fake_tag, tag_len);
return err_status_ok;
}
char external_hmac_description[] = "external hmac sha-1 authentication";
// auth_type_t external_hmac is the hmac metaobject
auth_type_t
external_hmac = {
(auth_alloc_func) external_hmac_alloc,
(auth_dealloc_func) external_hmac_dealloc,
(auth_init_func) external_hmac_init,
(auth_compute_func) external_hmac_compute,
(auth_update_func) external_hmac_update,
(auth_start_func) external_hmac_start,
(char *) external_hmac_description,
(int) 0, /* instance count */
(auth_test_case_t *) &external_hmac_test_case_0,
(debug_module_t *) &mod_external_hmac,
(auth_type_id_t) EXTERNAL_HMAC_SHA1
};
err_status_t
external_crypto_init() {
err_status_t status = crypto_kernel_replace_auth_type(
&external_hmac, EXTERNAL_HMAC_SHA1);
if (status) {
LOG(LS_ERROR) << "Error in replacing default auth module, error: "
<< status;
return err_status_fail;
}
return err_status_ok;
}
#endif // defined(HAVE_SRTP) && defined(ENABLE_EXTERNAL_AUTH)