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-rw-r--r--srtp/crypto/hash/null_auth.c160
1 files changed, 160 insertions, 0 deletions
diff --git a/srtp/crypto/hash/null_auth.c b/srtp/crypto/hash/null_auth.c
new file mode 100644
index 0000000..301348b
--- /dev/null
+++ b/srtp/crypto/hash/null_auth.c
@@ -0,0 +1,160 @@
+/*
+ * null_auth.c
+ *
+ * implements the do-nothing auth algorithm
+ *
+ * David A. McGrew
+ * Cisco Systems, Inc.
+ *
+ */
+
+/*
+ *
+ * Copyright (c) 2001-2006, Cisco Systems, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * 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.
+ *
+ * Neither the name of the Cisco Systems, Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "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
+ * COPYRIGHT HOLDERS OR CONTRIBUTORS 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.
+ *
+ */
+
+
+#include "null_auth.h"
+#include "alloc.h"
+
+/* null_auth uses the auth debug module */
+
+extern debug_module_t mod_auth;
+
+err_status_t
+null_auth_alloc(auth_t **a, int key_len, int out_len) {
+ extern auth_type_t null_auth;
+ uint8_t *pointer;
+
+ debug_print(mod_auth, "allocating auth func with key length %d", key_len);
+ debug_print(mod_auth, " tag length %d", out_len);
+
+ /* allocate memory for auth and null_auth_ctx_t structures */
+ pointer = (uint8_t*)crypto_alloc(sizeof(null_auth_ctx_t) + sizeof(auth_t));
+ if (pointer == NULL)
+ return err_status_alloc_fail;
+
+ /* set pointers */
+ *a = (auth_t *)pointer;
+ (*a)->type = &null_auth;
+ (*a)->state = pointer + sizeof (auth_t);
+ (*a)->out_len = out_len;
+ (*a)->prefix_len = out_len;
+ (*a)->key_len = key_len;
+
+ /* increment global count of all null_auth uses */
+ null_auth.ref_count++;
+
+ return err_status_ok;
+}
+
+err_status_t
+null_auth_dealloc(auth_t *a) {
+ extern auth_type_t null_auth;
+
+ /* zeroize entire state*/
+ octet_string_set_to_zero((uint8_t *)a,
+ sizeof(null_auth_ctx_t) + sizeof(auth_t));
+
+ /* free memory */
+ crypto_free(a);
+
+ /* decrement global count of all null_auth uses */
+ null_auth.ref_count--;
+
+ return err_status_ok;
+}
+
+err_status_t
+null_auth_init(null_auth_ctx_t *state, const uint8_t *key, int key_len) {
+
+ /* accept any length of key, and do nothing */
+
+ return err_status_ok;
+}
+
+err_status_t
+null_auth_compute(null_auth_ctx_t *state, uint8_t *message,
+ int msg_octets, int tag_len, uint8_t *result) {
+
+ return err_status_ok;
+}
+
+err_status_t
+null_auth_update(null_auth_ctx_t *state, uint8_t *message,
+ int msg_octets) {
+
+ return err_status_ok;
+}
+
+err_status_t
+null_auth_start(null_auth_ctx_t *state) {
+ return err_status_ok;
+}
+
+/*
+ * auth_type_t - defines description, test case, and null_auth
+ * metaobject
+ */
+
+/* begin test case 0 */
+
+auth_test_case_t
+null_auth_test_case_0 = {
+ 0, /* octets in key */
+ NULL, /* key */
+ 0, /* octets in data */
+ NULL, /* data */
+ 0, /* octets in tag */
+ NULL, /* tag */
+ NULL /* pointer to next testcase */
+};
+
+/* end test case 0 */
+
+char null_auth_description[] = "null authentication function";
+
+auth_type_t
+null_auth = {
+ (auth_alloc_func) null_auth_alloc,
+ (auth_dealloc_func) null_auth_dealloc,
+ (auth_init_func) null_auth_init,
+ (auth_compute_func) null_auth_compute,
+ (auth_update_func) null_auth_update,
+ (auth_start_func) null_auth_start,
+ (char *) null_auth_description,
+ (int) 0, /* instance count */
+ (auth_test_case_t *) &null_auth_test_case_0
+};
+