Unrevert 5590 "description"(=(Auto)update libjingle 61834300->61901702).
BUG=N/A
R=xians@webrtc.org
Review URL: https://webrtc-codereview.appspot.com/9009004
git-svn-id: http://webrtc.googlecode.com/svn/trunk@5595 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/talk/session/media/externalhmac.cc b/talk/session/media/externalhmac.cc
new file mode 100644
index 0000000..d5cfc95
--- /dev/null
+++ b/talk/session/media/externalhmac.cc
@@ -0,0 +1,186 @@
+/*
+ * 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/external_hmac.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)
