diff options
Diffstat (limited to 'third_party/srtp/crypto/hash/auth.c')
| -rw-r--r-- | third_party/srtp/crypto/hash/auth.c | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/third_party/srtp/crypto/hash/auth.c b/third_party/srtp/crypto/hash/auth.c new file mode 100644 index 00000000..8eb722d0 --- /dev/null +++ b/third_party/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; +} + + |