Update libsrtp to version 2.0

crypto/hash/null_auth.c

+/*
+ * 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.
+ *
+ */
+
+#ifdef HAVE_CONFIG_H
+    #include <config.h>
+#endif
+
+#include "null_auth.h"
+#include "err.h"                /* for srtp_debug */
+#include "alloc.h"
+
+/* null_auth uses the auth debug module */
+
+extern srtp_debug_module_t srtp_mod_auth;
+
+static srtp_err_status_t srtp_null_auth_alloc (srtp_auth_t **a, int key_len, int out_len)
+{
+    extern const srtp_auth_type_t srtp_null_auth;
+    uint8_t *pointer;
+
+    debug_print(srtp_mod_auth, "allocating auth func with key length %d", key_len);
+    debug_print(srtp_mod_auth, "                          tag length %d", out_len);
+
+    /* allocate memory for auth and srtp_null_auth_ctx_t structures */
+    pointer = (uint8_t*)srtp_crypto_alloc(sizeof(srtp_null_auth_ctx_t) + sizeof(srtp_auth_t));
+    if (pointer == NULL) {
+        return srtp_err_status_alloc_fail;
+    }
+
+    /* set pointers */
+    *a = (srtp_auth_t*)pointer;
+    (*a)->type = &srtp_null_auth;
+    (*a)->state = pointer + sizeof(srtp_auth_t);
+    (*a)->out_len = out_len;
+    (*a)->prefix_len = out_len;
+    (*a)->key_len = key_len;
+
+    return srtp_err_status_ok;
+}
+
+static srtp_err_status_t srtp_null_auth_dealloc (srtp_auth_t *a)
+{
+    extern const srtp_auth_type_t srtp_null_auth;
+
+    /* zeroize entire state*/
+    octet_string_set_to_zero((uint8_t*)a,
+                             sizeof(srtp_null_auth_ctx_t) + sizeof(srtp_auth_t));
+
+    /* free memory */
+    srtp_crypto_free(a);
+
+    return srtp_err_status_ok;
+}
+
+static srtp_err_status_t srtp_null_auth_init (void *statev, const uint8_t *key, int key_len)
+{
+    /* srtp_null_auth_ctx_t *state = (srtp_null_auth_ctx_t *)statev; */
+    /* accept any length of key, and do nothing */
+
+    return srtp_err_status_ok;
+}
+
+static srtp_err_status_t srtp_null_auth_compute (void *statev, const uint8_t *message,
+                                          int msg_octets, int tag_len, uint8_t *result)
+{
+    /* srtp_null_auth_ctx_t *state = (srtp_null_auth_ctx_t *)statev; */
+
+    return srtp_err_status_ok;
+}
+
+static srtp_err_status_t srtp_null_auth_update (void *statev, const uint8_t *message,
+                                         int msg_octets)
+{
+    /* srtp_null_auth_ctx_t *state = (srtp_null_auth_ctx_t *)statev; */
+
+    return srtp_err_status_ok;
+}
+
+static srtp_err_status_t srtp_null_auth_start (void *statev)
+{
+    /* srtp_null_auth_ctx_t *state = (srtp_null_auth_ctx_t *)statev; */
+
+    return srtp_err_status_ok;
+}
+
+/*
+ * srtp_auth_type_t - defines description, test case, and null_auth
+ * metaobject
+ */
+
+/* begin test case 0 */
+
+static const srtp_auth_test_case_t srtp_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 */
+
+static const char srtp_null_auth_description[] = "null authentication function";
+
+const srtp_auth_type_t srtp_null_auth  = {
+    srtp_null_auth_alloc,
+    srtp_null_auth_dealloc,
+    srtp_null_auth_init,
+    srtp_null_auth_compute,
+    srtp_null_auth_update,
+    srtp_null_auth_start,
+    srtp_null_auth_description,
+    &srtp_null_auth_test_case_0,
+    SRTP_NULL_AUTH
+};
+