Index: crypto/hash/null_auth.c |
diff --git a/crypto/hash/null_auth.c b/crypto/hash/null_auth.c |
new file mode 100644 |
index 0000000000000000000000000000000000000000..be9f131d81cd9dd2b77fccc0bb2fc6d350872051 |
--- /dev/null |
+++ b/crypto/hash/null_auth.c |
@@ -0,0 +1,161 @@ |
+/* |
+ * 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 |
+}; |
+ |