Adding upstream version 124.0.1.upstream/124.0.1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

4 files changed, 882 insertions, 0 deletions

diff --git a/third_party/libsrtp/src/crypto/kernel/alloc.c b/third_party/libsrtp/src/crypto/kernel/alloc.c
new file mode 100644
index 0000000000..3ebc315259
--- /dev/null
+++ b/third_party/libsrtp/src/crypto/kernel/alloc.c
@@ -0,0 +1,101 @@
+/*
+ * alloc.c
+ *
+ * memory allocation and deallocation
+ *
+ * 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"
+
+/* the debug module for memory allocation */
+
+srtp_debug_module_t srtp_mod_alloc = {
+    0,      /* debugging is off by default */
+    "alloc" /* printable name for module   */
+};
+
+/*
+ * Nota bene: the debugging statements for srtp_crypto_alloc() and
+ * srtp_crypto_free() have identical prefixes, which include the addresses
+ * of the memory locations on which they are operating.  This fact can
+ * be used to locate memory leaks, by turning on memory debugging,
+ * grepping for 'alloc', then matching alloc and free calls by
+ * address.
+ */
+
+#if defined(HAVE_STDLIB_H)
+
+void *srtp_crypto_alloc(size_t size)
+{
+    void *ptr;
+
+    if (!size) {
+        return NULL;
+    }
+
+    ptr = calloc(1, size);
+
+    if (ptr) {
+        debug_print(srtp_mod_alloc, "(location: %p) allocated", ptr);
+    } else {
+        debug_print(srtp_mod_alloc, "allocation failed (asked for %zu bytes)\n",
+                    size);
+    }
+
+    return ptr;
+}
+
+void srtp_crypto_free(void *ptr)
+{
+    debug_print(srtp_mod_alloc, "(location: %p) freed", ptr);
+
+    free(ptr);
+}
+
+#else /* we need to define our own memory allocation routines */
+
+#error no memory allocation defined yet
+
+#endif
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;
+}
diff --git a/third_party/libsrtp/src/crypto/kernel/err.c b/third_party/libsrtp/src/crypto/kernel/err.c
new file mode 100644
index 0000000000..9db5bfb432
--- /dev/null
+++ b/third_party/libsrtp/src/crypto/kernel/err.c
@@ -0,0 +1,108 @@
+/*
+ * err.c
+ *
+ * error status reporting functions
+ *
+ * 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 "err.h"
+#include "datatypes.h"
+#include <string.h>
+
+/* srtp_err_file is the FILE to which errors are reported */
+
+static FILE *srtp_err_file = NULL;
+
+srtp_err_status_t srtp_err_reporting_init()
+{
+#ifdef ERR_REPORTING_STDOUT
+    srtp_err_file = stdout;
+#elif defined(ERR_REPORTING_FILE)
+    /* open file for error reporting */
+    srtp_err_file = fopen(ERR_REPORTING_FILE, "w");
+    if (srtp_err_file == NULL) {
+        return srtp_err_status_init_fail;
+    }
+#endif
+
+    return srtp_err_status_ok;
+}
+
+static srtp_err_report_handler_func_t *srtp_err_report_handler = NULL;
+
+srtp_err_status_t srtp_install_err_report_handler(
+    srtp_err_report_handler_func_t func)
+{
+    srtp_err_report_handler = func;
+    return srtp_err_status_ok;
+}
+
+void srtp_err_report(srtp_err_reporting_level_t level, const char *format, ...)
+{
+    char msg[512];
+    va_list args;
+    if (srtp_err_file != NULL) {
+        va_start(args, format);
+        vfprintf(srtp_err_file, format, args);
+        va_end(args);
+    }
+    if (srtp_err_report_handler != NULL) {
+        va_start(args, format);
+        if (vsnprintf(msg, sizeof(msg), format, args) > 0) {
+            /* strip trailing \n, callback should not have one */
+            size_t l = strlen(msg);
+            if (l && msg[l - 1] == '\n') {
+                msg[l - 1] = '\0';
+            }
+            srtp_err_report_handler(level, msg);
+            /*
+             * NOTE, need to be carefull, there is a potential that
+             * octet_string_set_to_zero() could
+             * call srtp_err_report() in the future, leading to recursion
+             */
+            octet_string_set_to_zero(msg, sizeof(msg));
+        }
+        va_end(args);
+    }
+}
diff --git a/third_party/libsrtp/src/crypto/kernel/key.c b/third_party/libsrtp/src/crypto/kernel/key.c
new file mode 100644
index 0000000000..5e6a188726
--- /dev/null
+++ b/third_party/libsrtp/src/crypto/kernel/key.c
@@ -0,0 +1,114 @@
+/*
+ * key.c
+ *
+ * key usage limits enforcement
+ *
+ * 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 "key.h"
+
+#define soft_limit 0x10000
+
+srtp_err_status_t srtp_key_limit_set(srtp_key_limit_t key,
+                                     const srtp_xtd_seq_num_t s)
+{
+#ifdef NO_64BIT_MATH
+    if (high32(s) == 0 && low32(s) < soft_limit) {
+        return srtp_err_status_bad_param;
+    }
+#else
+    if (s < soft_limit) {
+        return srtp_err_status_bad_param;
+    }
+#endif
+    key->num_left = s;
+    key->state = srtp_key_state_normal;
+    return srtp_err_status_ok;
+}
+
+srtp_err_status_t srtp_key_limit_clone(srtp_key_limit_t original,
+                                       srtp_key_limit_t *new_key)
+{
+    if (original == NULL) {
+        return srtp_err_status_bad_param;
+    }
+    *new_key = original;
+    return srtp_err_status_ok;
+}
+
+srtp_key_event_t srtp_key_limit_update(srtp_key_limit_t key)
+{
+#ifdef NO_64BIT_MATH
+    if (low32(key->num_left) == 0) {
+        // carry
+        key->num_left =
+            make64(high32(key->num_left) - 1, low32(key->num_left) - 1);
+    } else {
+        // no carry
+        key->num_left = make64(high32(key->num_left), low32(key->num_left) - 1);
+    }
+    if (high32(key->num_left) != 0 || low32(key->num_left) >= soft_limit) {
+        return srtp_key_event_normal; /* we're above the soft limit */
+    }
+#else
+    key->num_left--;
+    if (key->num_left >= soft_limit) {
+        return srtp_key_event_normal; /* we're above the soft limit */
+    }
+#endif
+    if (key->state == srtp_key_state_normal) {
+        /* we just passed the soft limit, so change the state */
+        key->state = srtp_key_state_past_soft_limit;
+    }
+#ifdef NO_64BIT_MATH
+    if (low32(key->num_left) == 0 && high32(key->num_left == 0))
+#else
+    if (key->num_left < 1)
+#endif
+    { /* we just hit the hard limit */
+        key->state = srtp_key_state_expired;
+        return srtp_key_event_hard_limit;
+    }
+    return srtp_key_event_soft_limit;
+}