diff options
Diffstat (limited to 'third_party/libsrtp/src/crypto/hash/null_auth.c')
| -rw-r--r-- | third_party/libsrtp/src/crypto/hash/null_auth.c | 168 |
1 files changed, 168 insertions, 0 deletions
diff --git a/third_party/libsrtp/src/crypto/hash/null_auth.c b/third_party/libsrtp/src/crypto/hash/null_auth.c new file mode 100644 index 0000000000..5194417caf --- /dev/null +++ b/third_party/libsrtp/src/crypto/hash/null_auth.c @@ -0,0 +1,168 @@ +/* + * null_auth.c + * + * implements the do-nothing auth algorithm + * + * David A. McGrew + * Cisco Systems, Inc. + * + */ + +/* + * + * Copyright (c) 2001-2017, 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" +#include "cipher_types.h" + +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(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 /* */ +}; |