Adding upstream version 124.0.1.upstream/124.0.1

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

9 files changed, 1944 insertions, 0 deletions

diff --git a/third_party/libsrtp/src/crypto/hash/auth.c b/third_party/libsrtp/src/crypto/hash/auth.c
new file mode 100644
index 0000000000..9be0ccfd36
--- /dev/null
+++ b/third_party/libsrtp/src/crypto/hash/auth.c
@@ -0,0 +1,193 @@
+/*
+ * auth.c
+ *
+ * some bookkeeping functions for authentication 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 "auth.h"
+#include "err.h"       /* for srtp_debug */
+#include "datatypes.h" /* for octet_string */
+
+/* the debug module for authentiation */
+
+srtp_debug_module_t srtp_mod_auth = {
+    0,          /* debugging is off by default */
+    "auth func" /* printable name for module   */
+};
+
+int srtp_auth_get_key_length(const srtp_auth_t *a)
+{
+    return a->key_len;
+}
+
+int srtp_auth_get_tag_length(const srtp_auth_t *a)
+{
+    return a->out_len;
+}
+
+int srtp_auth_get_prefix_length(const srtp_auth_t *a)
+{
+    return a->prefix_len;
+}
+
+/*
+ * srtp_auth_type_test() tests an auth function of type ct against
+ * test cases provided in a list test_data 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
+
+srtp_err_status_t srtp_auth_type_test(const srtp_auth_type_t *at,
+                                      const srtp_auth_test_case_t *test_data)
+{
+    const srtp_auth_test_case_t *test_case = test_data;
+    srtp_auth_t *a;
+    srtp_err_status_t status;
+    uint8_t tag[SELF_TEST_TAG_BUF_OCTETS];
+    int i, case_num = 0;
+
+    debug_print(srtp_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 srtp_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 srtp_err_status_bad_param;
+        }
+
+        /* allocate auth */
+        status = srtp_auth_type_alloc(at, &a, test_case->key_length_octets,
+                                      test_case->tag_length_octets);
+        if (status) {
+            return status;
+        }
+
+        /* initialize auth */
+        status = srtp_auth_init(a, test_case->key);
+        if (status) {
+            srtp_auth_dealloc(a);
+            return status;
+        }
+
+        status = srtp_auth_start(a);
+        if (status) {
+            srtp_auth_dealloc(a);
+            return status;
+        }
+
+        /* zeroize tag then compute */
+        octet_string_set_to_zero(tag, test_case->tag_length_octets);
+        status = srtp_auth_compute(a, test_case->data,
+                                   test_case->data_length_octets, tag);
+        if (status) {
+            srtp_auth_dealloc(a);
+            return status;
+        }
+
+        debug_print(srtp_mod_auth, "key: %s",
+                    srtp_octet_string_hex_string(test_case->key,
+                                                 test_case->key_length_octets));
+        debug_print(srtp_mod_auth, "data: %s",
+                    srtp_octet_string_hex_string(
+                        test_case->data, test_case->data_length_octets));
+        debug_print(
+            srtp_mod_auth, "tag computed: %s",
+            srtp_octet_string_hex_string(tag, test_case->tag_length_octets));
+        debug_print(srtp_mod_auth, "tag expected: %s",
+                    srtp_octet_string_hex_string(test_case->tag,
+                                                 test_case->tag_length_octets));
+
+        /* check the result */
+        status = srtp_err_status_ok;
+        for (i = 0; i < test_case->tag_length_octets; i++) {
+            if (tag[i] != test_case->tag[i]) {
+                status = srtp_err_status_algo_fail;
+                debug_print(srtp_mod_auth, "test case %d failed", case_num);
+                debug_print(srtp_mod_auth, "  (mismatch at octet %d)", i);
+            }
+        }
+        if (status) {
+            srtp_auth_dealloc(a);
+            return srtp_err_status_algo_fail;
+        }
+
+        /* deallocate the auth function */
+        status = srtp_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 srtp_err_status_ok;
+}
+
+/*
+ * srtp_auth_type_self_test(at) performs srtp_auth_type_test on at's internal
+ * list of test data.
+ */
+
+srtp_err_status_t srtp_auth_type_self_test(const srtp_auth_type_t *at)
+{
+    return srtp_auth_type_test(at, at->test_data);
+}
diff --git a/third_party/libsrtp/src/crypto/hash/auth_test_cases.c b/third_party/libsrtp/src/crypto/hash/auth_test_cases.c
new file mode 100644
index 0000000000..22b9418434
--- /dev/null
+++ b/third_party/libsrtp/src/crypto/hash/auth_test_cases.c
@@ -0,0 +1,70 @@
+/*
+ *
+ * Copyright (c) 2013-2021, 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_test_cases.h"
+#include <stddef.h>
+
+/* clang-format off */
+static const uint8_t srtp_hmac_test_case_0_key[20] = {
+    0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b,
+    0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b,
+    0x0b, 0x0b, 0x0b, 0x0b
+};
+/* clang-format on */
+
+/* clang-format off */
+static const uint8_t srtp_hmac_test_case_0_data[8] = {
+    0x48, 0x69, 0x20, 0x54, 0x68, 0x65, 0x72, 0x65 /* "Hi There" */
+};
+/* clang-format on */
+
+/* clang-format off */
+static const uint8_t srtp_hmac_test_case_0_tag[20] = {
+    0xb6, 0x17, 0x31, 0x86, 0x55, 0x05, 0x72, 0x64,
+    0xe2, 0x8b, 0xc0, 0xb6, 0xfb, 0x37, 0x8c, 0x8e,
+    0xf1, 0x46, 0xbe, 0x00
+};
+/* clang-format on */
+
+const srtp_auth_test_case_t srtp_hmac_test_case_0 = {
+    sizeof(srtp_hmac_test_case_0_key),  /* octets in key            */
+    srtp_hmac_test_case_0_key,          /* key                      */
+    sizeof(srtp_hmac_test_case_0_data), /* octets in data           */
+    srtp_hmac_test_case_0_data,         /* data                     */
+    sizeof(srtp_hmac_test_case_0_tag),  /* octets in tag            */
+    srtp_hmac_test_case_0_tag,          /* tag                      */
+    NULL                                /* pointer to next testcase */
+};
diff --git a/third_party/libsrtp/src/crypto/hash/auth_test_cases.h b/third_party/libsrtp/src/crypto/hash/auth_test_cases.h
new file mode 100644
index 0000000000..9f37718205
--- /dev/null
+++ b/third_party/libsrtp/src/crypto/hash/auth_test_cases.h
@@ -0,0 +1,48 @@
+/*
+ *
+ * Copyright (c) 2013-2021, 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.
+ *
+ */
+
+#ifndef AUTH_TEST_CASES_H
+#define AUTH_TEST_CASES_H
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include "auth.h"
+
+extern const srtp_auth_test_case_t srtp_hmac_test_case_0;
+
+#endif
diff --git a/third_party/libsrtp/src/crypto/hash/hmac.c b/third_party/libsrtp/src/crypto/hash/hmac.c
new file mode 100644
index 0000000000..269c3f6a71
--- /dev/null
+++ b/third_party/libsrtp/src/crypto/hash/hmac.c
@@ -0,0 +1,249 @@
+/*
+ * hmac.c
+ *
+ * implementation of hmac srtp_auth_type_t
+ *
+ * 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 "hmac.h"
+#include "alloc.h"
+#include "cipher_types.h"
+#include "auth_test_cases.h"
+
+/* the debug module for authentiation */
+
+srtp_debug_module_t srtp_mod_hmac = {
+    0,           /* debugging is off by default */
+    "hmac sha-1" /* printable name for module   */
+};
+
+static srtp_err_status_t srtp_hmac_alloc(srtp_auth_t **a,
+                                         int key_len,
+                                         int out_len)
+{
+    extern const srtp_auth_type_t srtp_hmac;
+    uint8_t *pointer;
+
+    debug_print(srtp_mod_hmac, "allocating auth func with key length %d",
+                key_len);
+    debug_print(srtp_mod_hmac, "                          tag length %d",
+                out_len);
+
+    /*
+     * check key length - note that we don't support keys larger
+     * than 20 bytes yet
+     */
+    if (key_len > 20) {
+        return srtp_err_status_bad_param;
+    }
+
+    /* check output length - should be less than 20 bytes */
+    if (out_len > 20) {
+        return srtp_err_status_bad_param;
+    }
+
+    /* allocate memory for auth and srtp_hmac_ctx_t structures */
+    pointer = (uint8_t *)srtp_crypto_alloc(sizeof(srtp_hmac_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_hmac;
+    (*a)->state = pointer + sizeof(srtp_auth_t);
+    (*a)->out_len = out_len;
+    (*a)->key_len = key_len;
+    (*a)->prefix_len = 0;
+
+    return srtp_err_status_ok;
+}
+
+static srtp_err_status_t srtp_hmac_dealloc(srtp_auth_t *a)
+{
+    /* zeroize entire state*/
+    octet_string_set_to_zero(a, sizeof(srtp_hmac_ctx_t) + sizeof(srtp_auth_t));
+
+    /* free memory */
+    srtp_crypto_free(a);
+
+    return srtp_err_status_ok;
+}
+
+static srtp_err_status_t srtp_hmac_init(void *statev,
+                                        const uint8_t *key,
+                                        int key_len)
+{
+    srtp_hmac_ctx_t *state = (srtp_hmac_ctx_t *)statev;
+    int i;
+    uint8_t ipad[64];
+
+    /*
+     * check key length - note that we don't support keys larger
+     * than 20 bytes yet
+     */
+    if (key_len > 20) {
+        return srtp_err_status_bad_param;
+    }
+
+    /*
+     * set values of ipad and opad by exoring the key into the
+     * appropriate constant values
+     */
+    for (i = 0; i < key_len; i++) {
+        ipad[i] = key[i] ^ 0x36;
+        state->opad[i] = key[i] ^ 0x5c;
+    }
+    /* set the rest of ipad, opad to constant values */
+    for (; i < 64; i++) {
+        ipad[i] = 0x36;
+        ((uint8_t *)state->opad)[i] = 0x5c;
+    }
+
+    debug_print(srtp_mod_hmac, "ipad: %s",
+                srtp_octet_string_hex_string(ipad, 64));
+
+    /* initialize sha1 context */
+    srtp_sha1_init(&state->init_ctx);
+
+    /* hash ipad ^ key */
+    srtp_sha1_update(&state->init_ctx, ipad, 64);
+    memcpy(&state->ctx, &state->init_ctx, sizeof(srtp_sha1_ctx_t));
+
+    return srtp_err_status_ok;
+}
+
+static srtp_err_status_t srtp_hmac_start(void *statev)
+{
+    srtp_hmac_ctx_t *state = (srtp_hmac_ctx_t *)statev;
+
+    memcpy(&state->ctx, &state->init_ctx, sizeof(srtp_sha1_ctx_t));
+
+    return srtp_err_status_ok;
+}
+
+static srtp_err_status_t srtp_hmac_update(void *statev,
+                                          const uint8_t *message,
+                                          int msg_octets)
+{
+    srtp_hmac_ctx_t *state = (srtp_hmac_ctx_t *)statev;
+
+    debug_print(srtp_mod_hmac, "input: %s",
+                srtp_octet_string_hex_string(message, msg_octets));
+
+    /* hash message into sha1 context */
+    srtp_sha1_update(&state->ctx, message, msg_octets);
+
+    return srtp_err_status_ok;
+}
+
+static srtp_err_status_t srtp_hmac_compute(void *statev,
+                                           const uint8_t *message,
+                                           int msg_octets,
+                                           int tag_len,
+                                           uint8_t *result)
+{
+    srtp_hmac_ctx_t *state = (srtp_hmac_ctx_t *)statev;
+    uint32_t hash_value[5];
+    uint32_t H[5];
+    int i;
+
+    /* check tag length, return error if we can't provide the value expected */
+    if (tag_len > 20) {
+        return srtp_err_status_bad_param;
+    }
+
+    /* hash message, copy output into H */
+    srtp_hmac_update(state, message, msg_octets);
+    srtp_sha1_final(&state->ctx, H);
+
+    /*
+     * note that we don't need to debug_print() the input, since the
+     * function hmac_update() already did that for us
+     */
+    debug_print(srtp_mod_hmac, "intermediate state: %s",
+                srtp_octet_string_hex_string((uint8_t *)H, 20));
+
+    /* re-initialize hash context */
+    srtp_sha1_init(&state->ctx);
+
+    /* hash opad ^ key  */
+    srtp_sha1_update(&state->ctx, (uint8_t *)state->opad, 64);
+
+    /* hash the result of the inner hash */
+    srtp_sha1_update(&state->ctx, (uint8_t *)H, 20);
+
+    /* the result is returned in the array hash_value[] */
+    srtp_sha1_final(&state->ctx, hash_value);
+
+    /* copy hash_value to *result */
+    for (i = 0; i < tag_len; i++) {
+        result[i] = ((uint8_t *)hash_value)[i];
+    }
+
+    debug_print(srtp_mod_hmac, "output: %s",
+                srtp_octet_string_hex_string((uint8_t *)hash_value, tag_len));
+
+    return srtp_err_status_ok;
+}
+
+static const char srtp_hmac_description[] =
+    "hmac sha-1 authentication function";
+
+/*
+ * srtp_auth_type_t hmac is the hmac metaobject
+ */
+
+const srtp_auth_type_t srtp_hmac = {
+    srtp_hmac_alloc,        /* */
+    srtp_hmac_dealloc,      /* */
+    srtp_hmac_init,         /* */
+    srtp_hmac_compute,      /* */
+    srtp_hmac_update,       /* */
+    srtp_hmac_start,        /* */
+    srtp_hmac_description,  /* */
+    &srtp_hmac_test_case_0, /* */
+    SRTP_HMAC_SHA1          /* */
+};
diff --git a/third_party/libsrtp/src/crypto/hash/hmac_mbedtls.c b/third_party/libsrtp/src/crypto/hash/hmac_mbedtls.c
new file mode 100644
index 0000000000..f710be9c78
--- /dev/null
+++ b/third_party/libsrtp/src/crypto/hash/hmac_mbedtls.c
@@ -0,0 +1,221 @@
+/*
+ * hmac_mbedtls.c
+ *
+ * Implementation of hmac srtp_auth_type_t that leverages Mbedtls
+ *
+ * YongCheng Yang
+ */
+/*
+ *
+ * Copyright(c) 2013-2017, 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 "auth.h"
+#include "alloc.h"
+#include "err.h" /* for srtp_debug */
+#include "auth_test_cases.h"
+#include <mbedtls/md.h>
+
+#define SHA1_DIGEST_SIZE 20
+
+/* the debug module for authentiation */
+
+srtp_debug_module_t srtp_mod_hmac = {
+    0,                   /* debugging is off by default */
+    "hmac sha-1 mbedtls" /* printable name for module   */
+};
+
+static srtp_err_status_t srtp_hmac_mbedtls_alloc(srtp_auth_t **a,
+                                                 int key_len,
+                                                 int out_len)
+{
+    extern const srtp_auth_type_t srtp_hmac;
+
+    debug_print(srtp_mod_hmac, "allocating auth func with key length %d",
+                key_len);
+    debug_print(srtp_mod_hmac, "                          tag length %d",
+                out_len);
+
+    /* check output length - should be less than 20 bytes */
+    if (key_len > SHA1_DIGEST_SIZE) {
+        return srtp_err_status_bad_param;
+    }
+    /* check output length - should be less than 20 bytes */
+    if (out_len > SHA1_DIGEST_SIZE) {
+        return srtp_err_status_bad_param;
+    }
+
+    *a = (srtp_auth_t *)srtp_crypto_alloc(sizeof(srtp_auth_t));
+    if (*a == NULL) {
+        return srtp_err_status_alloc_fail;
+    }
+    // allocate the buffer of mbedtls context.
+    (*a)->state = srtp_crypto_alloc(sizeof(mbedtls_md_context_t));
+    if ((*a)->state == NULL) {
+        srtp_crypto_free(*a);
+        *a = NULL;
+        return srtp_err_status_alloc_fail;
+    }
+    mbedtls_md_init((mbedtls_md_context_t *)(*a)->state);
+
+    /* set pointers */
+    (*a)->type = &srtp_hmac;
+    (*a)->out_len = out_len;
+    (*a)->key_len = key_len;
+    (*a)->prefix_len = 0;
+
+    return srtp_err_status_ok;
+}
+
+static srtp_err_status_t srtp_hmac_mbedtls_dealloc(srtp_auth_t *a)
+{
+    mbedtls_md_context_t *hmac_ctx;
+    hmac_ctx = (mbedtls_md_context_t *)a->state;
+    mbedtls_md_free(hmac_ctx);
+    srtp_crypto_free(hmac_ctx);
+    /* zeroize entire state*/
+    octet_string_set_to_zero(a, sizeof(srtp_auth_t));
+
+    /* free memory */
+    srtp_crypto_free(a);
+
+    return srtp_err_status_ok;
+}
+
+static srtp_err_status_t srtp_hmac_mbedtls_start(void *statev)
+{
+    mbedtls_md_context_t *state = (mbedtls_md_context_t *)statev;
+    if (mbedtls_md_hmac_reset(state) != 0)
+        return srtp_err_status_auth_fail;
+
+    return srtp_err_status_ok;
+}
+
+static srtp_err_status_t srtp_hmac_mbedtls_init(void *statev,
+                                                const uint8_t *key,
+                                                int key_len)
+{
+    mbedtls_md_context_t *state = (mbedtls_md_context_t *)statev;
+    const mbedtls_md_info_t *info = NULL;
+
+    info = mbedtls_md_info_from_type(MBEDTLS_MD_SHA1);
+    if (info == NULL)
+        return srtp_err_status_auth_fail;
+
+    if (mbedtls_md_setup(state, info, 1) != 0)
+        return srtp_err_status_auth_fail;
+
+    debug_print(srtp_mod_hmac, "mbedtls setup, name: %s",
+                mbedtls_md_get_name(info));
+    debug_print(srtp_mod_hmac, "mbedtls setup, size: %d",
+                mbedtls_md_get_size(info));
+
+    if (mbedtls_md_hmac_starts(state, key, key_len) != 0)
+        return srtp_err_status_auth_fail;
+
+    return srtp_err_status_ok;
+}
+
+static srtp_err_status_t srtp_hmac_mbedtls_update(void *statev,
+                                                  const uint8_t *message,
+                                                  int msg_octets)
+{
+    mbedtls_md_context_t *state = (mbedtls_md_context_t *)statev;
+
+    debug_print(srtp_mod_hmac, "input: %s",
+                srtp_octet_string_hex_string(message, msg_octets));
+
+    if (mbedtls_md_hmac_update(state, message, msg_octets) != 0)
+        return srtp_err_status_auth_fail;
+
+    return srtp_err_status_ok;
+}
+
+static srtp_err_status_t srtp_hmac_mbedtls_compute(void *statev,
+                                                   const uint8_t *message,
+                                                   int msg_octets,
+                                                   int tag_len,
+                                                   uint8_t *result)
+{
+    mbedtls_md_context_t *state = (mbedtls_md_context_t *)statev;
+    uint8_t hash_value[SHA1_DIGEST_SIZE];
+    int i;
+
+    /* check tag length, return error if we can't provide the value expected */
+    if (tag_len > SHA1_DIGEST_SIZE) {
+        return srtp_err_status_bad_param;
+    }
+
+    /* hash message, copy output into H */
+    if (mbedtls_md_hmac_update(statev, message, msg_octets) != 0)
+        return srtp_err_status_auth_fail;
+
+    if (mbedtls_md_hmac_finish(state, hash_value) != 0)
+        return srtp_err_status_auth_fail;
+
+    /* copy hash_value to *result */
+    for (i = 0; i < tag_len; i++) {
+        result[i] = hash_value[i];
+    }
+
+    debug_print(srtp_mod_hmac, "output: %s",
+                srtp_octet_string_hex_string(hash_value, tag_len));
+
+    return srtp_err_status_ok;
+}
+
+/* end test case 0 */
+
+static const char srtp_hmac_mbedtls_description[] =
+    "hmac sha-1 authentication function using mbedtls";
+
+/*
+ * srtp_auth_type_t hmac is the hmac metaobject
+ */
+
+const srtp_auth_type_t srtp_hmac = {
+    srtp_hmac_mbedtls_alloc,       /* */
+    srtp_hmac_mbedtls_dealloc,     /* */
+    srtp_hmac_mbedtls_init,        /* */
+    srtp_hmac_mbedtls_compute,     /* */
+    srtp_hmac_mbedtls_update,      /* */
+    srtp_hmac_mbedtls_start,       /* */
+    srtp_hmac_mbedtls_description, /* */
+    &srtp_hmac_test_case_0,        /* */
+    SRTP_HMAC_SHA1                 /* */
+};
diff --git a/third_party/libsrtp/src/crypto/hash/hmac_nss.c b/third_party/libsrtp/src/crypto/hash/hmac_nss.c
new file mode 100644
index 0000000000..8d1e42f620
--- /dev/null
+++ b/third_party/libsrtp/src/crypto/hash/hmac_nss.c
@@ -0,0 +1,290 @@
+/*
+ *
+ * Copyright(c) 2013-2017, 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 "auth.h"
+#include "alloc.h"
+#include "err.h" /* for srtp_debug */
+#include "auth_test_cases.h"
+
+#define NSS_PKCS11_2_0_COMPAT 1
+
+#include <nss.h>
+#include <pk11pub.h>
+
+#define SHA1_DIGEST_SIZE 20
+
+/* the debug module for authentiation */
+
+srtp_debug_module_t srtp_mod_hmac = {
+    0,               /* debugging is off by default */
+    "hmac sha-1 nss" /* printable name for module   */
+};
+
+typedef struct {
+    NSSInitContext *nss;
+    PK11SymKey *key;
+    PK11Context *ctx;
+} srtp_hmac_nss_ctx_t;
+
+static srtp_err_status_t srtp_hmac_alloc(srtp_auth_t **a,
+                                         int key_len,
+                                         int out_len)
+{
+    extern const srtp_auth_type_t srtp_hmac;
+    srtp_hmac_nss_ctx_t *hmac;
+    NSSInitContext *nss;
+
+    debug_print(srtp_mod_hmac, "allocating auth func with key length %d",
+                key_len);
+    debug_print(srtp_mod_hmac, "                          tag length %d",
+                out_len);
+
+    /* check output length - should be less than 20 bytes */
+    if (out_len > SHA1_DIGEST_SIZE) {
+        return srtp_err_status_bad_param;
+    }
+
+    /* Initialize NSS equiv of NSS_NoDB_Init(NULL) */
+    nss = NSS_InitContext("", "", "", "", NULL,
+                          NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+                              NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+                              NSS_INIT_OPTIMIZESPACE);
+    if (!nss) {
+        return srtp_err_status_auth_fail;
+    }
+
+    *a = (srtp_auth_t *)srtp_crypto_alloc(sizeof(srtp_auth_t));
+    if (*a == NULL) {
+        NSS_ShutdownContext(nss);
+        return srtp_err_status_alloc_fail;
+    }
+
+    hmac =
+        (srtp_hmac_nss_ctx_t *)srtp_crypto_alloc(sizeof(srtp_hmac_nss_ctx_t));
+    if (hmac == NULL) {
+        NSS_ShutdownContext(nss);
+        srtp_crypto_free(*a);
+        *a = NULL;
+        return srtp_err_status_alloc_fail;
+    }
+
+    hmac->nss = nss;
+    hmac->key = NULL;
+    hmac->ctx = NULL;
+
+    /* set pointers */
+    (*a)->state = hmac;
+    (*a)->type = &srtp_hmac;
+    (*a)->out_len = out_len;
+    (*a)->key_len = key_len;
+    (*a)->prefix_len = 0;
+
+    return srtp_err_status_ok;
+}
+
+static srtp_err_status_t srtp_hmac_dealloc(srtp_auth_t *a)
+{
+    srtp_hmac_nss_ctx_t *hmac;
+
+    hmac = (srtp_hmac_nss_ctx_t *)a->state;
+    if (hmac) {
+        /* free any PK11 values that have been created */
+        if (hmac->key) {
+            PK11_FreeSymKey(hmac->key);
+            hmac->key = NULL;
+        }
+
+        if (hmac->ctx) {
+            PK11_DestroyContext(hmac->ctx, PR_TRUE);
+            hmac->ctx = NULL;
+        }
+
+        if (hmac->nss) {
+            NSS_ShutdownContext(hmac->nss);
+            hmac->nss = NULL;
+        }
+
+        /* zeroize everything */
+        octet_string_set_to_zero(hmac, sizeof(srtp_hmac_nss_ctx_t));
+        srtp_crypto_free(hmac);
+    }
+
+    /* free memory */
+    srtp_crypto_free(a);
+
+    return srtp_err_status_ok;
+}
+
+static srtp_err_status_t srtp_hmac_start(void *statev)
+{
+    srtp_hmac_nss_ctx_t *hmac;
+    hmac = (srtp_hmac_nss_ctx_t *)statev;
+
+    if (PK11_DigestBegin(hmac->ctx) != SECSuccess) {
+        return srtp_err_status_auth_fail;
+    }
+    return srtp_err_status_ok;
+}
+
+static srtp_err_status_t srtp_hmac_init(void *statev,
+                                        const uint8_t *key,
+                                        int key_len)
+{
+    srtp_hmac_nss_ctx_t *hmac;
+    hmac = (srtp_hmac_nss_ctx_t *)statev;
+    PK11SymKey *sym_key;
+    PK11Context *ctx;
+
+    if (hmac->ctx) {
+        PK11_DestroyContext(hmac->ctx, PR_TRUE);
+        hmac->ctx = NULL;
+    }
+
+    if (hmac->key) {
+        PK11_FreeSymKey(hmac->key);
+        hmac->key = NULL;
+    }
+
+    PK11SlotInfo *slot = PK11_GetBestSlot(CKM_SHA_1_HMAC, NULL);
+    if (!slot) {
+        return srtp_err_status_bad_param;
+    }
+
+    SECItem key_item = { siBuffer, (unsigned char *)key, key_len };
+    sym_key = PK11_ImportSymKey(slot, CKM_SHA_1_HMAC, PK11_OriginUnwrap,
+                                CKA_SIGN, &key_item, NULL);
+    PK11_FreeSlot(slot);
+
+    if (!sym_key) {
+        return srtp_err_status_auth_fail;
+    }
+
+    SECItem param_item = { siBuffer, NULL, 0 };
+    ctx = PK11_CreateContextBySymKey(CKM_SHA_1_HMAC, CKA_SIGN, sym_key,
+                                     &param_item);
+    if (!ctx) {
+        PK11_FreeSymKey(sym_key);
+        return srtp_err_status_auth_fail;
+    }
+
+    hmac->key = sym_key;
+    hmac->ctx = ctx;
+
+    return srtp_err_status_ok;
+}
+
+static srtp_err_status_t srtp_hmac_update(void *statev,
+                                          const uint8_t *message,
+                                          int msg_octets)
+{
+    srtp_hmac_nss_ctx_t *hmac;
+    hmac = (srtp_hmac_nss_ctx_t *)statev;
+
+    debug_print(srtp_mod_hmac, "input: %s",
+                srtp_octet_string_hex_string(message, msg_octets));
+
+    if (PK11_DigestOp(hmac->ctx, message, msg_octets) != SECSuccess) {
+        return srtp_err_status_auth_fail;
+    }
+
+    return srtp_err_status_ok;
+}
+
+static srtp_err_status_t srtp_hmac_compute(void *statev,
+                                           const uint8_t *message,
+                                           int msg_octets,
+                                           int tag_len,
+                                           uint8_t *result)
+{
+    srtp_hmac_nss_ctx_t *hmac;
+    hmac = (srtp_hmac_nss_ctx_t *)statev;
+    uint8_t hash_value[SHA1_DIGEST_SIZE];
+    int i;
+    unsigned int len;
+
+    debug_print(srtp_mod_hmac, "input: %s",
+                srtp_octet_string_hex_string(message, msg_octets));
+
+    /* check tag length, return error if we can't provide the value expected */
+    if (tag_len > SHA1_DIGEST_SIZE) {
+        return srtp_err_status_bad_param;
+    }
+
+    if (PK11_DigestOp(hmac->ctx, message, msg_octets) != SECSuccess) {
+        return srtp_err_status_auth_fail;
+    }
+
+    if (PK11_DigestFinal(hmac->ctx, hash_value, &len, SHA1_DIGEST_SIZE) !=
+        SECSuccess) {
+        return srtp_err_status_auth_fail;
+    }
+
+    if (len < tag_len)
+        return srtp_err_status_auth_fail;
+
+    /* copy hash_value to *result */
+    for (i = 0; i < tag_len; i++) {
+        result[i] = hash_value[i];
+    }
+
+    debug_print(srtp_mod_hmac, "output: %s",
+                srtp_octet_string_hex_string(hash_value, tag_len));
+
+    return srtp_err_status_ok;
+}
+
+static const char srtp_hmac_description[] =
+    "hmac sha-1 authentication function";
+
+/*
+ * srtp_auth_type_t hmac is the hmac metaobject
+ */
+
+const srtp_auth_type_t srtp_hmac = {
+    srtp_hmac_alloc,        /* */
+    srtp_hmac_dealloc,      /* */
+    srtp_hmac_init,         /* */
+    srtp_hmac_compute,      /* */
+    srtp_hmac_update,       /* */
+    srtp_hmac_start,        /* */
+    srtp_hmac_description,  /* */
+    &srtp_hmac_test_case_0, /* */
+    SRTP_HMAC_SHA1          /* */
+};
diff --git a/third_party/libsrtp/src/crypto/hash/hmac_ossl.c b/third_party/libsrtp/src/crypto/hash/hmac_ossl.c
new file mode 100644
index 0000000000..ee6b0b5851
--- /dev/null
+++ b/third_party/libsrtp/src/crypto/hash/hmac_ossl.c
@@ -0,0 +1,242 @@
+/*
+ * hmac_ossl.c
+ *
+ * Implementation of hmac srtp_auth_type_t that leverages OpenSSL
+ *
+ * John A. Foley
+ * Cisco Systems, Inc.
+ */
+/*
+ *
+ * Copyright(c) 2013-2017, 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 "auth.h"
+#include "alloc.h"
+#include "err.h" /* for srtp_debug */
+#include "auth_test_cases.h"
+#include <openssl/evp.h>
+#include <openssl/hmac.h>
+
+#define SHA1_DIGEST_SIZE 20
+
+/* the debug module for authentiation */
+
+srtp_debug_module_t srtp_mod_hmac = {
+    0,                   /* debugging is off by default */
+    "hmac sha-1 openssl" /* printable name for module   */
+};
+
+static srtp_err_status_t srtp_hmac_alloc(srtp_auth_t **a,
+                                         int key_len,
+                                         int out_len)
+{
+    extern const srtp_auth_type_t srtp_hmac;
+
+    debug_print(srtp_mod_hmac, "allocating auth func with key length %d",
+                key_len);
+    debug_print(srtp_mod_hmac, "                          tag length %d",
+                out_len);
+
+    /* check output length - should be less than 20 bytes */
+    if (out_len > SHA1_DIGEST_SIZE) {
+        return srtp_err_status_bad_param;
+    }
+
+/* OpenSSL 1.1.0 made HMAC_CTX an opaque structure, which must be allocated
+   using HMAC_CTX_new.  But this function doesn't exist in OpenSSL 1.0.x. */
+#if OPENSSL_VERSION_NUMBER < 0x10100000L || LIBRESSL_VERSION_NUMBER
+    {
+        /* allocate memory for auth and HMAC_CTX structures */
+        uint8_t *pointer;
+        HMAC_CTX *new_hmac_ctx;
+        pointer = (uint8_t *)srtp_crypto_alloc(sizeof(HMAC_CTX) +
+                                               sizeof(srtp_auth_t));
+        if (pointer == NULL) {
+            return srtp_err_status_alloc_fail;
+        }
+        *a = (srtp_auth_t *)pointer;
+        (*a)->state = pointer + sizeof(srtp_auth_t);
+        new_hmac_ctx = (HMAC_CTX *)((*a)->state);
+
+        HMAC_CTX_init(new_hmac_ctx);
+    }
+
+#else
+    *a = (srtp_auth_t *)srtp_crypto_alloc(sizeof(srtp_auth_t));
+    if (*a == NULL) {
+        return srtp_err_status_alloc_fail;
+    }
+
+    (*a)->state = HMAC_CTX_new();
+    if ((*a)->state == NULL) {
+        srtp_crypto_free(*a);
+        *a = NULL;
+        return srtp_err_status_alloc_fail;
+    }
+#endif
+
+    /* set pointers */
+    (*a)->type = &srtp_hmac;
+    (*a)->out_len = out_len;
+    (*a)->key_len = key_len;
+    (*a)->prefix_len = 0;
+
+    return srtp_err_status_ok;
+}
+
+static srtp_err_status_t srtp_hmac_dealloc(srtp_auth_t *a)
+{
+    HMAC_CTX *hmac_ctx;
+
+    hmac_ctx = (HMAC_CTX *)a->state;
+
+#if OPENSSL_VERSION_NUMBER < 0x10100000L || LIBRESSL_VERSION_NUMBER
+    HMAC_CTX_cleanup(hmac_ctx);
+
+    /* zeroize entire state*/
+    octet_string_set_to_zero(a, sizeof(HMAC_CTX) + sizeof(srtp_auth_t));
+
+#else
+    HMAC_CTX_free(hmac_ctx);
+
+    /* zeroize entire state*/
+    octet_string_set_to_zero(a, sizeof(srtp_auth_t));
+#endif
+
+    /* free memory */
+    srtp_crypto_free(a);
+
+    return srtp_err_status_ok;
+}
+
+static srtp_err_status_t srtp_hmac_start(void *statev)
+{
+    HMAC_CTX *state = (HMAC_CTX *)statev;
+
+    if (HMAC_Init_ex(state, NULL, 0, NULL, NULL) == 0)
+        return srtp_err_status_auth_fail;
+
+    return srtp_err_status_ok;
+}
+
+static srtp_err_status_t srtp_hmac_init(void *statev,
+                                        const uint8_t *key,
+                                        int key_len)
+{
+    HMAC_CTX *state = (HMAC_CTX *)statev;
+
+    if (HMAC_Init_ex(state, key, key_len, EVP_sha1(), NULL) == 0)
+        return srtp_err_status_auth_fail;
+
+    return srtp_err_status_ok;
+}
+
+static srtp_err_status_t srtp_hmac_update(void *statev,
+                                          const uint8_t *message,
+                                          int msg_octets)
+{
+    HMAC_CTX *state = (HMAC_CTX *)statev;
+
+    debug_print(srtp_mod_hmac, "input: %s",
+                srtp_octet_string_hex_string(message, msg_octets));
+
+    if (HMAC_Update(state, message, msg_octets) == 0)
+        return srtp_err_status_auth_fail;
+
+    return srtp_err_status_ok;
+}
+
+static srtp_err_status_t srtp_hmac_compute(void *statev,
+                                           const uint8_t *message,
+                                           int msg_octets,
+                                           int tag_len,
+                                           uint8_t *result)
+{
+    HMAC_CTX *state = (HMAC_CTX *)statev;
+    uint8_t hash_value[SHA1_DIGEST_SIZE];
+    int i;
+    unsigned int len;
+
+    debug_print(srtp_mod_hmac, "input: %s",
+                srtp_octet_string_hex_string(message, msg_octets));
+
+    /* check tag length, return error if we can't provide the value expected */
+    if (tag_len > SHA1_DIGEST_SIZE) {
+        return srtp_err_status_bad_param;
+    }
+
+    /* hash message, copy output into H */
+    if (HMAC_Update(state, message, msg_octets) == 0)
+        return srtp_err_status_auth_fail;
+
+    if (HMAC_Final(state, hash_value, &len) == 0)
+        return srtp_err_status_auth_fail;
+
+    if (len < tag_len)
+        return srtp_err_status_auth_fail;
+
+    /* copy hash_value to *result */
+    for (i = 0; i < tag_len; i++) {
+        result[i] = hash_value[i];
+    }
+
+    debug_print(srtp_mod_hmac, "output: %s",
+                srtp_octet_string_hex_string(hash_value, tag_len));
+
+    return srtp_err_status_ok;
+}
+
+static const char srtp_hmac_description[] =
+    "hmac sha-1 authentication function";
+
+/*
+ * srtp_auth_type_t hmac is the hmac metaobject
+ */
+
+const srtp_auth_type_t srtp_hmac = {
+    srtp_hmac_alloc,        /* */
+    srtp_hmac_dealloc,      /* */
+    srtp_hmac_init,         /* */
+    srtp_hmac_compute,      /* */
+    srtp_hmac_update,       /* */
+    srtp_hmac_start,        /* */
+    srtp_hmac_description,  /* */
+    &srtp_hmac_test_case_0, /* */
+    SRTP_HMAC_SHA1          /* */
+};
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               /* */
+};
diff --git a/third_party/libsrtp/src/crypto/hash/sha1.c b/third_party/libsrtp/src/crypto/hash/sha1.c
new file mode 100644
index 0000000000..901a933250
--- /dev/null
+++ b/third_party/libsrtp/src/crypto/hash/sha1.c
@@ -0,0 +1,463 @@
+/*
+ * sha1.c
+ *
+ * an implementation of the Secure Hash Algorithm v.1 (SHA-1),
+ * specified in FIPS 180-1
+ *
+ * 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 "sha1.h"
+
+srtp_debug_module_t srtp_mod_sha1 = {
+    0,      /* debugging is off by default */
+    "sha-1" /* printable module name       */
+};
+
+/* SN == Rotate left N bits */
+#define S1(X) ((X << 1) | (X >> 31))
+#define S5(X) ((X << 5) | (X >> 27))
+#define S30(X) ((X << 30) | (X >> 2))
+
+#define f0(B, C, D) ((B & C) | (~B & D))
+#define f1(B, C, D) (B ^ C ^ D)
+#define f2(B, C, D) ((B & C) | (B & D) | (C & D))
+#define f3(B, C, D) (B ^ C ^ D)
+
+/*
+ * nota bene: the variable K0 appears in the curses library, so we
+ * give longer names to these variables to avoid spurious warnings
+ * on systems that uses curses
+ */
+
+uint32_t SHA_K0 = 0x5A827999; /* Kt for 0  <= t <= 19 */
+uint32_t SHA_K1 = 0x6ED9EBA1; /* Kt for 20 <= t <= 39 */
+uint32_t SHA_K2 = 0x8F1BBCDC; /* Kt for 40 <= t <= 59 */
+uint32_t SHA_K3 = 0xCA62C1D6; /* Kt for 60 <= t <= 79 */
+
+/*
+ *  srtp_sha1_core(M, H) computes the core compression function, where M is
+ *  the next part of the message (in network byte order) and H is the
+ *  intermediate state { H0, H1, ...} (in host byte order)
+ *
+ *  this function does not do any of the padding required in the
+ *  complete SHA1 function
+ *
+ *  this function is used in the SEAL 3.0 key setup routines
+ *  (crypto/cipher/seal.c)
+ */
+
+void srtp_sha1_core(const uint32_t M[16], uint32_t hash_value[5])
+{
+    uint32_t H0;
+    uint32_t H1;
+    uint32_t H2;
+    uint32_t H3;
+    uint32_t H4;
+    uint32_t W[80];
+    uint32_t A, B, C, D, E, TEMP;
+    int t;
+
+    /* copy hash_value into H0, H1, H2, H3, H4 */
+    H0 = hash_value[0];
+    H1 = hash_value[1];
+    H2 = hash_value[2];
+    H3 = hash_value[3];
+    H4 = hash_value[4];
+
+    /* copy/xor message into array */
+
+    W[0] = be32_to_cpu(M[0]);
+    W[1] = be32_to_cpu(M[1]);
+    W[2] = be32_to_cpu(M[2]);
+    W[3] = be32_to_cpu(M[3]);
+    W[4] = be32_to_cpu(M[4]);
+    W[5] = be32_to_cpu(M[5]);
+    W[6] = be32_to_cpu(M[6]);
+    W[7] = be32_to_cpu(M[7]);
+    W[8] = be32_to_cpu(M[8]);
+    W[9] = be32_to_cpu(M[9]);
+    W[10] = be32_to_cpu(M[10]);
+    W[11] = be32_to_cpu(M[11]);
+    W[12] = be32_to_cpu(M[12]);
+    W[13] = be32_to_cpu(M[13]);
+    W[14] = be32_to_cpu(M[14]);
+    W[15] = be32_to_cpu(M[15]);
+    TEMP = W[13] ^ W[8] ^ W[2] ^ W[0];
+    W[16] = S1(TEMP);
+    TEMP = W[14] ^ W[9] ^ W[3] ^ W[1];
+    W[17] = S1(TEMP);
+    TEMP = W[15] ^ W[10] ^ W[4] ^ W[2];
+    W[18] = S1(TEMP);
+    TEMP = W[16] ^ W[11] ^ W[5] ^ W[3];
+    W[19] = S1(TEMP);
+    TEMP = W[17] ^ W[12] ^ W[6] ^ W[4];
+    W[20] = S1(TEMP);
+    TEMP = W[18] ^ W[13] ^ W[7] ^ W[5];
+    W[21] = S1(TEMP);
+    TEMP = W[19] ^ W[14] ^ W[8] ^ W[6];
+    W[22] = S1(TEMP);
+    TEMP = W[20] ^ W[15] ^ W[9] ^ W[7];
+    W[23] = S1(TEMP);
+    TEMP = W[21] ^ W[16] ^ W[10] ^ W[8];
+    W[24] = S1(TEMP);
+    TEMP = W[22] ^ W[17] ^ W[11] ^ W[9];
+    W[25] = S1(TEMP);
+    TEMP = W[23] ^ W[18] ^ W[12] ^ W[10];
+    W[26] = S1(TEMP);
+    TEMP = W[24] ^ W[19] ^ W[13] ^ W[11];
+    W[27] = S1(TEMP);
+    TEMP = W[25] ^ W[20] ^ W[14] ^ W[12];
+    W[28] = S1(TEMP);
+    TEMP = W[26] ^ W[21] ^ W[15] ^ W[13];
+    W[29] = S1(TEMP);
+    TEMP = W[27] ^ W[22] ^ W[16] ^ W[14];
+    W[30] = S1(TEMP);
+    TEMP = W[28] ^ W[23] ^ W[17] ^ W[15];
+    W[31] = S1(TEMP);
+
+    /* process the remainder of the array */
+    for (t = 32; t < 80; t++) {
+        TEMP = W[t - 3] ^ W[t - 8] ^ W[t - 14] ^ W[t - 16];
+        W[t] = S1(TEMP);
+    }
+
+    A = H0;
+    B = H1;
+    C = H2;
+    D = H3;
+    E = H4;
+
+    for (t = 0; t < 20; t++) {
+        TEMP = S5(A) + f0(B, C, D) + E + W[t] + SHA_K0;
+        E = D;
+        D = C;
+        C = S30(B);
+        B = A;
+        A = TEMP;
+    }
+    for (; t < 40; t++) {
+        TEMP = S5(A) + f1(B, C, D) + E + W[t] + SHA_K1;
+        E = D;
+        D = C;
+        C = S30(B);
+        B = A;
+        A = TEMP;
+    }
+    for (; t < 60; t++) {
+        TEMP = S5(A) + f2(B, C, D) + E + W[t] + SHA_K2;
+        E = D;
+        D = C;
+        C = S30(B);
+        B = A;
+        A = TEMP;
+    }
+    for (; t < 80; t++) {
+        TEMP = S5(A) + f3(B, C, D) + E + W[t] + SHA_K3;
+        E = D;
+        D = C;
+        C = S30(B);
+        B = A;
+        A = TEMP;
+    }
+
+    hash_value[0] = H0 + A;
+    hash_value[1] = H1 + B;
+    hash_value[2] = H2 + C;
+    hash_value[3] = H3 + D;
+    hash_value[4] = H4 + E;
+
+    return;
+}
+
+void srtp_sha1_init(srtp_sha1_ctx_t *ctx)
+{
+    /* initialize state vector */
+    ctx->H[0] = 0x67452301;
+    ctx->H[1] = 0xefcdab89;
+    ctx->H[2] = 0x98badcfe;
+    ctx->H[3] = 0x10325476;
+    ctx->H[4] = 0xc3d2e1f0;
+
+    /* indicate that message buffer is empty */
+    ctx->octets_in_buffer = 0;
+
+    /* reset message bit-count to zero */
+    ctx->num_bits_in_msg = 0;
+}
+
+void srtp_sha1_update(srtp_sha1_ctx_t *ctx,
+                      const uint8_t *msg,
+                      int octets_in_msg)
+{
+    int i;
+    uint8_t *buf = (uint8_t *)ctx->M;
+
+    /* update message bit-count */
+    ctx->num_bits_in_msg += octets_in_msg * 8;
+
+    /* loop over 16-word blocks of M */
+    while (octets_in_msg > 0) {
+        if (octets_in_msg + ctx->octets_in_buffer >= 64) {
+            /*
+             * copy words of M into msg buffer until that buffer is full,
+             * converting them into host byte order as needed
+             */
+            octets_in_msg -= (64 - ctx->octets_in_buffer);
+            for (i = ctx->octets_in_buffer; i < 64; i++) {
+                buf[i] = *msg++;
+            }
+            ctx->octets_in_buffer = 0;
+
+            /* process a whole block */
+
+            debug_print0(srtp_mod_sha1, "(update) running srtp_sha1_core()");
+
+            srtp_sha1_core(ctx->M, ctx->H);
+
+        } else {
+            debug_print0(srtp_mod_sha1,
+                         "(update) not running srtp_sha1_core()");
+
+            for (i = ctx->octets_in_buffer;
+                 i < (ctx->octets_in_buffer + octets_in_msg); i++) {
+                buf[i] = *msg++;
+            }
+            ctx->octets_in_buffer += octets_in_msg;
+            octets_in_msg = 0;
+        }
+    }
+}
+
+/*
+ * srtp_sha1_final(ctx, output) computes the result for ctx and copies it
+ * into the twenty octets located at *output
+ */
+
+void srtp_sha1_final(srtp_sha1_ctx_t *ctx, uint32_t output[5])
+{
+    uint32_t A, B, C, D, E, TEMP;
+    uint32_t W[80];
+    int i, t;
+
+    /*
+     * process the remaining octets_in_buffer, padding and terminating as
+     * necessary
+     */
+    {
+        int tail = ctx->octets_in_buffer % 4;
+
+        /* copy/xor message into array */
+        for (i = 0; i < (ctx->octets_in_buffer + 3) / 4; i++) {
+            W[i] = be32_to_cpu(ctx->M[i]);
+        }
+
+        /* set the high bit of the octet immediately following the message */
+        switch (tail) {
+        case (3):
+            W[i - 1] = (be32_to_cpu(ctx->M[i - 1]) & 0xffffff00) | 0x80;
+            W[i] = 0x0;
+            break;
+        case (2):
+            W[i - 1] = (be32_to_cpu(ctx->M[i - 1]) & 0xffff0000) | 0x8000;
+            W[i] = 0x0;
+            break;
+        case (1):
+            W[i - 1] = (be32_to_cpu(ctx->M[i - 1]) & 0xff000000) | 0x800000;
+            W[i] = 0x0;
+            break;
+        case (0):
+            W[i] = 0x80000000;
+            break;
+        }
+
+        /* zeroize remaining words */
+        for (i++; i < 15; i++) {
+            W[i] = 0x0;
+        }
+
+        /*
+         * if there is room at the end of the word array, then set the
+         * last word to the bit-length of the message; otherwise, set that
+         * word to zero and then we need to do one more run of the
+         * compression algo.
+         */
+        if (ctx->octets_in_buffer < 56) {
+            W[15] = ctx->num_bits_in_msg;
+        } else if (ctx->octets_in_buffer < 60) {
+            W[15] = 0x0;
+        }
+
+        /* process the word array */
+        for (t = 16; t < 80; t++) {
+            TEMP = W[t - 3] ^ W[t - 8] ^ W[t - 14] ^ W[t - 16];
+            W[t] = S1(TEMP);
+        }
+
+        A = ctx->H[0];
+        B = ctx->H[1];
+        C = ctx->H[2];
+        D = ctx->H[3];
+        E = ctx->H[4];
+
+        for (t = 0; t < 20; t++) {
+            TEMP = S5(A) + f0(B, C, D) + E + W[t] + SHA_K0;
+            E = D;
+            D = C;
+            C = S30(B);
+            B = A;
+            A = TEMP;
+        }
+        for (; t < 40; t++) {
+            TEMP = S5(A) + f1(B, C, D) + E + W[t] + SHA_K1;
+            E = D;
+            D = C;
+            C = S30(B);
+            B = A;
+            A = TEMP;
+        }
+        for (; t < 60; t++) {
+            TEMP = S5(A) + f2(B, C, D) + E + W[t] + SHA_K2;
+            E = D;
+            D = C;
+            C = S30(B);
+            B = A;
+            A = TEMP;
+        }
+        for (; t < 80; t++) {
+            TEMP = S5(A) + f3(B, C, D) + E + W[t] + SHA_K3;
+            E = D;
+            D = C;
+            C = S30(B);
+            B = A;
+            A = TEMP;
+        }
+
+        ctx->H[0] += A;
+        ctx->H[1] += B;
+        ctx->H[2] += C;
+        ctx->H[3] += D;
+        ctx->H[4] += E;
+    }
+
+    debug_print0(srtp_mod_sha1, "(final) running srtp_sha1_core()");
+
+    if (ctx->octets_in_buffer >= 56) {
+        debug_print0(srtp_mod_sha1, "(final) running srtp_sha1_core() again");
+
+        /* we need to do one final run of the compression algo */
+
+        /*
+         * set initial part of word array to zeros, and set the
+         * final part to the number of bits in the message
+         */
+        for (i = 0; i < 15; i++) {
+            W[i] = 0x0;
+        }
+        W[15] = ctx->num_bits_in_msg;
+
+        /* process the word array */
+        for (t = 16; t < 80; t++) {
+            TEMP = W[t - 3] ^ W[t - 8] ^ W[t - 14] ^ W[t - 16];
+            W[t] = S1(TEMP);
+        }
+
+        A = ctx->H[0];
+        B = ctx->H[1];
+        C = ctx->H[2];
+        D = ctx->H[3];
+        E = ctx->H[4];
+
+        for (t = 0; t < 20; t++) {
+            TEMP = S5(A) + f0(B, C, D) + E + W[t] + SHA_K0;
+            E = D;
+            D = C;
+            C = S30(B);
+            B = A;
+            A = TEMP;
+        }
+        for (; t < 40; t++) {
+            TEMP = S5(A) + f1(B, C, D) + E + W[t] + SHA_K1;
+            E = D;
+            D = C;
+            C = S30(B);
+            B = A;
+            A = TEMP;
+        }
+        for (; t < 60; t++) {
+            TEMP = S5(A) + f2(B, C, D) + E + W[t] + SHA_K2;
+            E = D;
+            D = C;
+            C = S30(B);
+            B = A;
+            A = TEMP;
+        }
+        for (; t < 80; t++) {
+            TEMP = S5(A) + f3(B, C, D) + E + W[t] + SHA_K3;
+            E = D;
+            D = C;
+            C = S30(B);
+            B = A;
+            A = TEMP;
+        }
+
+        ctx->H[0] += A;
+        ctx->H[1] += B;
+        ctx->H[2] += C;
+        ctx->H[3] += D;
+        ctx->H[4] += E;
+    }
+
+    /* copy result into output buffer */
+    output[0] = be32_to_cpu(ctx->H[0]);
+    output[1] = be32_to_cpu(ctx->H[1]);
+    output[2] = be32_to_cpu(ctx->H[2]);
+    output[3] = be32_to_cpu(ctx->H[3]);
+    output[4] = be32_to_cpu(ctx->H[4]);
+
+    /* indicate that message buffer in context is empty */
+    ctx->octets_in_buffer = 0;
+
+    return;
+}