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Diffstat (limited to 'third_party/libsrtp/src/crypto/kernel/crypto_kernel.c')
-rw-r--r--third_party/libsrtp/src/crypto/kernel/crypto_kernel.c559
1 files changed, 559 insertions, 0 deletions
diff --git a/third_party/libsrtp/src/crypto/kernel/crypto_kernel.c b/third_party/libsrtp/src/crypto/kernel/crypto_kernel.c
new file mode 100644
index 0000000000..764e7ecfa0
--- /dev/null
+++ b/third_party/libsrtp/src/crypto/kernel/crypto_kernel.c
@@ -0,0 +1,559 @@
+/*
+ * crypto_kernel.c
+ *
+ * header for the cryptographic kernel
+ *
+ * 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 "alloc.h"
+
+#include "crypto_kernel.h"
+#include "cipher_types.h"
+
+/* the debug module for the crypto_kernel */
+
+srtp_debug_module_t srtp_mod_crypto_kernel = {
+ 0, /* debugging is off by default */
+ "crypto kernel" /* printable name for module */
+};
+
+/* crypto_kernel is a global variable, the only one of its datatype */
+
+srtp_crypto_kernel_t crypto_kernel = {
+ srtp_crypto_kernel_state_insecure, /* start off in insecure state */
+ NULL, /* no cipher types yet */
+ NULL, /* no auth types yet */
+ NULL /* no debug modules yet */
+};
+
+#define MAX_RNG_TRIALS 25
+
+srtp_err_status_t srtp_crypto_kernel_init()
+{
+ srtp_err_status_t status;
+
+ /* check the security state */
+ if (crypto_kernel.state == srtp_crypto_kernel_state_secure) {
+ /*
+ * we're already in the secure state, but we've been asked to
+ * re-initialize, so we just re-run the self-tests and then return
+ */
+ return srtp_crypto_kernel_status();
+ }
+
+ /* initialize error reporting system */
+ status = srtp_err_reporting_init();
+ if (status) {
+ return status;
+ }
+
+ /* load debug modules */
+ status = srtp_crypto_kernel_load_debug_module(&srtp_mod_crypto_kernel);
+ if (status) {
+ return status;
+ }
+ status = srtp_crypto_kernel_load_debug_module(&srtp_mod_auth);
+ if (status) {
+ return status;
+ }
+ status = srtp_crypto_kernel_load_debug_module(&srtp_mod_cipher);
+ if (status) {
+ return status;
+ }
+ status = srtp_crypto_kernel_load_debug_module(&srtp_mod_alloc);
+ if (status) {
+ return status;
+ }
+
+ /* load cipher types */
+ status = srtp_crypto_kernel_load_cipher_type(&srtp_null_cipher,
+ SRTP_NULL_CIPHER);
+ if (status) {
+ return status;
+ }
+ status = srtp_crypto_kernel_load_cipher_type(&srtp_aes_icm_128,
+ SRTP_AES_ICM_128);
+ if (status) {
+ return status;
+ }
+ status = srtp_crypto_kernel_load_cipher_type(&srtp_aes_icm_256,
+ SRTP_AES_ICM_256);
+ if (status) {
+ return status;
+ }
+ status = srtp_crypto_kernel_load_debug_module(&srtp_mod_aes_icm);
+ if (status) {
+ return status;
+ }
+#ifdef GCM
+ status = srtp_crypto_kernel_load_cipher_type(&srtp_aes_icm_192,
+ SRTP_AES_ICM_192);
+ if (status) {
+ return status;
+ }
+ status = srtp_crypto_kernel_load_cipher_type(&srtp_aes_gcm_128,
+ SRTP_AES_GCM_128);
+ if (status) {
+ return status;
+ }
+ status = srtp_crypto_kernel_load_cipher_type(&srtp_aes_gcm_256,
+ SRTP_AES_GCM_256);
+ if (status) {
+ return status;
+ }
+ status = srtp_crypto_kernel_load_debug_module(&srtp_mod_aes_gcm);
+ if (status) {
+ return status;
+ }
+#endif
+
+ /* load auth func types */
+ status = srtp_crypto_kernel_load_auth_type(&srtp_null_auth, SRTP_NULL_AUTH);
+ if (status) {
+ return status;
+ }
+ status = srtp_crypto_kernel_load_auth_type(&srtp_hmac, SRTP_HMAC_SHA1);
+ if (status) {
+ return status;
+ }
+ status = srtp_crypto_kernel_load_debug_module(&srtp_mod_hmac);
+ if (status) {
+ return status;
+ }
+
+ /* change state to secure */
+ crypto_kernel.state = srtp_crypto_kernel_state_secure;
+
+ return srtp_err_status_ok;
+}
+
+srtp_err_status_t srtp_crypto_kernel_status()
+{
+ srtp_err_status_t status;
+ srtp_kernel_cipher_type_t *ctype = crypto_kernel.cipher_type_list;
+ srtp_kernel_auth_type_t *atype = crypto_kernel.auth_type_list;
+
+ /* for each cipher type, describe and test */
+ while (ctype != NULL) {
+ srtp_err_report(srtp_err_level_info, "cipher: %s\n",
+ ctype->cipher_type->description);
+ srtp_err_report(srtp_err_level_info, " self-test: ");
+ status = srtp_cipher_type_self_test(ctype->cipher_type);
+ if (status) {
+ srtp_err_report(srtp_err_level_error, "failed with error code %d\n",
+ status);
+ exit(status);
+ }
+ srtp_err_report(srtp_err_level_info, "passed\n");
+ ctype = ctype->next;
+ }
+
+ /* for each auth type, describe and test */
+ while (atype != NULL) {
+ srtp_err_report(srtp_err_level_info, "auth func: %s\n",
+ atype->auth_type->description);
+ srtp_err_report(srtp_err_level_info, " self-test: ");
+ status = srtp_auth_type_self_test(atype->auth_type);
+ if (status) {
+ srtp_err_report(srtp_err_level_error, "failed with error code %d\n",
+ status);
+ exit(status);
+ }
+ srtp_err_report(srtp_err_level_info, "passed\n");
+ atype = atype->next;
+ }
+
+ srtp_crypto_kernel_list_debug_modules();
+
+ return srtp_err_status_ok;
+}
+
+srtp_err_status_t srtp_crypto_kernel_list_debug_modules()
+{
+ srtp_kernel_debug_module_t *dm = crypto_kernel.debug_module_list;
+
+ /* describe each debug module */
+ srtp_err_report(srtp_err_level_info, "debug modules loaded:\n");
+ while (dm != NULL) {
+ srtp_err_report(srtp_err_level_info, " %s ", dm->mod->name);
+ if (dm->mod->on) {
+ srtp_err_report(srtp_err_level_info, "(on)\n");
+ } else {
+ srtp_err_report(srtp_err_level_info, "(off)\n");
+ }
+ dm = dm->next;
+ }
+
+ return srtp_err_status_ok;
+}
+
+srtp_err_status_t srtp_crypto_kernel_shutdown()
+{
+ /*
+ * free dynamic memory used in crypto_kernel at present
+ */
+
+ /* walk down cipher type list, freeing memory */
+ while (crypto_kernel.cipher_type_list != NULL) {
+ srtp_kernel_cipher_type_t *ctype = crypto_kernel.cipher_type_list;
+ crypto_kernel.cipher_type_list = ctype->next;
+ debug_print(srtp_mod_crypto_kernel, "freeing memory for cipher %s",
+ ctype->cipher_type->description);
+ srtp_crypto_free(ctype);
+ }
+
+ /* walk down authetication module list, freeing memory */
+ while (crypto_kernel.auth_type_list != NULL) {
+ srtp_kernel_auth_type_t *atype = crypto_kernel.auth_type_list;
+ crypto_kernel.auth_type_list = atype->next;
+ debug_print(srtp_mod_crypto_kernel,
+ "freeing memory for authentication %s",
+ atype->auth_type->description);
+ srtp_crypto_free(atype);
+ }
+
+ /* walk down debug module list, freeing memory */
+ while (crypto_kernel.debug_module_list != NULL) {
+ srtp_kernel_debug_module_t *kdm = crypto_kernel.debug_module_list;
+ crypto_kernel.debug_module_list = kdm->next;
+ debug_print(srtp_mod_crypto_kernel,
+ "freeing memory for debug module %s", kdm->mod->name);
+ srtp_crypto_free(kdm);
+ }
+
+ /* return to insecure state */
+ crypto_kernel.state = srtp_crypto_kernel_state_insecure;
+
+ return srtp_err_status_ok;
+}
+
+static inline srtp_err_status_t srtp_crypto_kernel_do_load_cipher_type(
+ const srtp_cipher_type_t *new_ct,
+ srtp_cipher_type_id_t id,
+ int replace)
+{
+ srtp_kernel_cipher_type_t *ctype;
+ srtp_kernel_cipher_type_t *new_ctype = NULL;
+ srtp_err_status_t status;
+
+ /* defensive coding */
+ if (new_ct == NULL) {
+ return srtp_err_status_bad_param;
+ }
+
+ if (new_ct->id != id) {
+ return srtp_err_status_bad_param;
+ }
+
+ /* check cipher type by running self-test */
+ status = srtp_cipher_type_self_test(new_ct);
+ if (status) {
+ return status;
+ }
+
+ /* walk down list, checking if this type is in the list already */
+ ctype = crypto_kernel.cipher_type_list;
+ while (ctype != NULL) {
+ if (id == ctype->id) {
+ if (!replace) {
+ return srtp_err_status_bad_param;
+ }
+ status =
+ srtp_cipher_type_test(new_ct, ctype->cipher_type->test_data);
+ if (status) {
+ return status;
+ }
+ new_ctype = ctype;
+ break;
+ } else if (new_ct == ctype->cipher_type) {
+ return srtp_err_status_bad_param;
+ }
+ ctype = ctype->next;
+ }
+
+ /* if not found, put new_ct at the head of the list */
+ if (ctype == NULL) {
+ /* allocate memory */
+ new_ctype = (srtp_kernel_cipher_type_t *)srtp_crypto_alloc(
+ sizeof(srtp_kernel_cipher_type_t));
+ if (new_ctype == NULL) {
+ return srtp_err_status_alloc_fail;
+ }
+ new_ctype->next = crypto_kernel.cipher_type_list;
+
+ /* set head of list to new cipher type */
+ crypto_kernel.cipher_type_list = new_ctype;
+ }
+
+ /* set fields */
+ new_ctype->cipher_type = new_ct;
+ new_ctype->id = id;
+
+ return srtp_err_status_ok;
+}
+
+srtp_err_status_t srtp_crypto_kernel_load_cipher_type(
+ const srtp_cipher_type_t *new_ct,
+ srtp_cipher_type_id_t id)
+{
+ return srtp_crypto_kernel_do_load_cipher_type(new_ct, id, 0);
+}
+
+srtp_err_status_t srtp_replace_cipher_type(const srtp_cipher_type_t *new_ct,
+ srtp_cipher_type_id_t id)
+{
+ return srtp_crypto_kernel_do_load_cipher_type(new_ct, id, 1);
+}
+
+srtp_err_status_t srtp_crypto_kernel_do_load_auth_type(
+ const srtp_auth_type_t *new_at,
+ srtp_auth_type_id_t id,
+ int replace)
+{
+ srtp_kernel_auth_type_t *atype;
+ srtp_kernel_auth_type_t *new_atype = NULL;
+ srtp_err_status_t status;
+
+ /* defensive coding */
+ if (new_at == NULL) {
+ return srtp_err_status_bad_param;
+ }
+
+ if (new_at->id != id) {
+ return srtp_err_status_bad_param;
+ }
+
+ /* check auth type by running self-test */
+ status = srtp_auth_type_self_test(new_at);
+ if (status) {
+ return status;
+ }
+
+ /* walk down list, checking if this type is in the list already */
+ atype = crypto_kernel.auth_type_list;
+ while (atype != NULL) {
+ if (id == atype->id) {
+ if (!replace) {
+ return srtp_err_status_bad_param;
+ }
+ status = srtp_auth_type_test(new_at, atype->auth_type->test_data);
+ if (status) {
+ return status;
+ }
+ new_atype = atype;
+ break;
+ } else if (new_at == atype->auth_type) {
+ return srtp_err_status_bad_param;
+ }
+ atype = atype->next;
+ }
+
+ /* if not found, put new_at at the head of the list */
+ if (atype == NULL) {
+ /* allocate memory */
+ new_atype = (srtp_kernel_auth_type_t *)srtp_crypto_alloc(
+ sizeof(srtp_kernel_auth_type_t));
+ if (new_atype == NULL) {
+ return srtp_err_status_alloc_fail;
+ }
+
+ new_atype->next = crypto_kernel.auth_type_list;
+ /* set head of list to new auth type */
+ crypto_kernel.auth_type_list = new_atype;
+ }
+
+ /* set fields */
+ new_atype->auth_type = new_at;
+ new_atype->id = id;
+
+ return srtp_err_status_ok;
+}
+
+srtp_err_status_t srtp_crypto_kernel_load_auth_type(
+ const srtp_auth_type_t *new_at,
+ srtp_auth_type_id_t id)
+{
+ return srtp_crypto_kernel_do_load_auth_type(new_at, id, 0);
+}
+
+srtp_err_status_t srtp_replace_auth_type(const srtp_auth_type_t *new_at,
+ srtp_auth_type_id_t id)
+{
+ return srtp_crypto_kernel_do_load_auth_type(new_at, id, 1);
+}
+
+const srtp_cipher_type_t *srtp_crypto_kernel_get_cipher_type(
+ srtp_cipher_type_id_t id)
+{
+ srtp_kernel_cipher_type_t *ctype;
+
+ /* walk down list, looking for id */
+ ctype = crypto_kernel.cipher_type_list;
+ while (ctype != NULL) {
+ if (id == ctype->id) {
+ return ctype->cipher_type;
+ }
+ ctype = ctype->next;
+ }
+
+ /* haven't found the right one, indicate failure by returning NULL */
+ return NULL;
+}
+
+srtp_err_status_t srtp_crypto_kernel_alloc_cipher(srtp_cipher_type_id_t id,
+ srtp_cipher_pointer_t *cp,
+ int key_len,
+ int tag_len)
+{
+ const srtp_cipher_type_t *ct;
+
+ /*
+ * if the crypto_kernel is not yet initialized, we refuse to allocate
+ * any ciphers - this is a bit extra-paranoid
+ */
+ if (crypto_kernel.state != srtp_crypto_kernel_state_secure) {
+ return srtp_err_status_init_fail;
+ }
+
+ ct = srtp_crypto_kernel_get_cipher_type(id);
+ if (!ct) {
+ return srtp_err_status_fail;
+ }
+
+ return ((ct)->alloc(cp, key_len, tag_len));
+}
+
+const srtp_auth_type_t *srtp_crypto_kernel_get_auth_type(srtp_auth_type_id_t id)
+{
+ srtp_kernel_auth_type_t *atype;
+
+ /* walk down list, looking for id */
+ atype = crypto_kernel.auth_type_list;
+ while (atype != NULL) {
+ if (id == atype->id) {
+ return atype->auth_type;
+ }
+ atype = atype->next;
+ }
+
+ /* haven't found the right one, indicate failure by returning NULL */
+ return NULL;
+}
+
+srtp_err_status_t srtp_crypto_kernel_alloc_auth(srtp_auth_type_id_t id,
+ srtp_auth_pointer_t *ap,
+ int key_len,
+ int tag_len)
+{
+ const srtp_auth_type_t *at;
+
+ /*
+ * if the crypto_kernel is not yet initialized, we refuse to allocate
+ * any auth functions - this is a bit extra-paranoid
+ */
+ if (crypto_kernel.state != srtp_crypto_kernel_state_secure) {
+ return srtp_err_status_init_fail;
+ }
+
+ at = srtp_crypto_kernel_get_auth_type(id);
+ if (!at) {
+ return srtp_err_status_fail;
+ }
+
+ return ((at)->alloc(ap, key_len, tag_len));
+}
+
+srtp_err_status_t srtp_crypto_kernel_load_debug_module(
+ srtp_debug_module_t *new_dm)
+{
+ srtp_kernel_debug_module_t *kdm, *new;
+
+ /* defensive coding */
+ if (new_dm == NULL || new_dm->name == NULL) {
+ return srtp_err_status_bad_param;
+ }
+
+ /* walk down list, checking if this type is in the list already */
+ kdm = crypto_kernel.debug_module_list;
+ while (kdm != NULL) {
+ if (strncmp(new_dm->name, kdm->mod->name, 64) == 0) {
+ return srtp_err_status_bad_param;
+ }
+ kdm = kdm->next;
+ }
+
+ /* put new_dm at the head of the list */
+ /* allocate memory */
+ new = (srtp_kernel_debug_module_t *)srtp_crypto_alloc(
+ sizeof(srtp_kernel_debug_module_t));
+ if (new == NULL) {
+ return srtp_err_status_alloc_fail;
+ }
+
+ /* set fields */
+ new->mod = new_dm;
+ new->next = crypto_kernel.debug_module_list;
+
+ /* set head of list to new cipher type */
+ crypto_kernel.debug_module_list = new;
+
+ return srtp_err_status_ok;
+}
+
+srtp_err_status_t srtp_crypto_kernel_set_debug_module(const char *name, int on)
+{
+ srtp_kernel_debug_module_t *kdm;
+
+ /* walk down list, checking if this type is in the list already */
+ kdm = crypto_kernel.debug_module_list;
+ while (kdm != NULL) {
+ if (strncmp(name, kdm->mod->name, 64) == 0) {
+ kdm->mod->on = on;
+ return srtp_err_status_ok;
+ }
+ kdm = kdm->next;
+ }
+
+ return srtp_err_status_fail;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-05 16:57:56 +0000