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authorErwin Nindl <nine@wirdorange.org>2007-06-22 13:59:20 +0000
committerErwin Nindl <nine@wirdorange.org>2007-06-22 13:59:20 +0000
commit0275479cb56c7f562f3513fef66c83fc44d1d8c9 (patch)
treef6fbb703cebf62d18b05e2a5e7591ac08c5b6702 /srtp/crypto/hash/auth.c
parentsatp internet draft 00 final ietf version (diff)
added libsrtp to svn
Diffstat (limited to 'srtp/crypto/hash/auth.c')
-rw-r--r--srtp/crypto/hash/auth.c173
1 files changed, 173 insertions, 0 deletions
diff --git a/srtp/crypto/hash/auth.c b/srtp/crypto/hash/auth.c
new file mode 100644
index 0000000..8eb722d
--- /dev/null
+++ b/srtp/crypto/hash/auth.c
@@ -0,0 +1,173 @@
+/*
+ * auth.c
+ *
+ * some bookkeeping functions for authentication functions
+ *
+ * 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 "auth.h"
+
+/* the debug module for authentiation */
+
+debug_module_t mod_auth = {
+ 0, /* debugging is off by default */
+ "auth func" /* printable name for module */
+};
+
+
+int
+auth_get_key_length(const auth_t *a) {
+ return a->key_len;
+}
+
+int
+auth_get_tag_length(const auth_t *a) {
+ return a->out_len;
+}
+
+int
+auth_get_prefix_length(const auth_t *a) {
+ return a->prefix_len;
+}
+
+int
+auth_type_get_ref_count(const auth_type_t *at) {
+ return at->ref_count;
+}
+
+/*
+ * auth_type_self_test() tests an auth function of type ct against
+ * test cases provided in an array of values of key, data, and tag
+ * that is known to be good
+ */
+
+/* should be big enough for most occasions */
+#define SELF_TEST_TAG_BUF_OCTETS 32
+
+err_status_t
+auth_type_self_test(const auth_type_t *at) {
+ auth_test_case_t *test_case = at->test_data;
+ auth_t *a;
+ err_status_t status;
+ uint8_t tag[SELF_TEST_TAG_BUF_OCTETS];
+ int i, case_num = 0;
+
+ debug_print(mod_auth, "running self-test for auth function %s",
+ at->description);
+
+ /*
+ * check to make sure that we have at least one test case, and
+ * return an error if we don't - we need to be paranoid here
+ */
+ if (test_case == NULL)
+ return err_status_cant_check;
+
+ /* loop over all test cases */
+ while (test_case != NULL) {
+
+ /* check test case parameters */
+ if (test_case->tag_length_octets > SELF_TEST_TAG_BUF_OCTETS)
+ return err_status_bad_param;
+
+ /* allocate auth */
+ status = auth_type_alloc(at, &a, test_case->key_length_octets,
+ test_case->tag_length_octets);
+ if (status)
+ return status;
+
+ /* initialize auth */
+ status = auth_init(a, test_case->key);
+ if (status) {
+ auth_dealloc(a);
+ return status;
+ }
+
+ /* zeroize tag then compute */
+ octet_string_set_to_zero(tag, test_case->tag_length_octets);
+ status = auth_compute(a, test_case->data,
+ test_case->data_length_octets, tag);
+ if (status) {
+ auth_dealloc(a);
+ return status;
+ }
+
+ debug_print(mod_auth, "key: %s",
+ octet_string_hex_string(test_case->key,
+ test_case->key_length_octets));
+ debug_print(mod_auth, "data: %s",
+ octet_string_hex_string(test_case->data,
+ test_case->data_length_octets));
+ debug_print(mod_auth, "tag computed: %s",
+ octet_string_hex_string(tag, test_case->tag_length_octets));
+ debug_print(mod_auth, "tag expected: %s",
+ octet_string_hex_string(test_case->tag,
+ test_case->tag_length_octets));
+
+ /* check the result */
+ status = err_status_ok;
+ for (i=0; i < test_case->tag_length_octets; i++)
+ if (tag[i] != test_case->tag[i]) {
+ status = err_status_algo_fail;
+ debug_print(mod_auth, "test case %d failed", case_num);
+ debug_print(mod_auth, " (mismatch at octet %d)", i);
+ }
+ if (status) {
+ auth_dealloc(a);
+ return err_status_algo_fail;
+ }
+
+ /* deallocate the auth function */
+ status = auth_dealloc(a);
+ if (status)
+ return status;
+
+ /*
+ * the auth function passed the test case, so move on to the next test
+ * case in the list; if NULL, we'll quit and return an OK
+ */
+ test_case = test_case->next_test_case;
+ ++case_num;
+ }
+
+ return err_status_ok;
+}
+
+