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diff --git a/third_party/libsrtp/src/test/ut_sim.c b/third_party/libsrtp/src/test/ut_sim.c
new file mode 100644
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+++ b/third_party/libsrtp/src/test/ut_sim.c
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+/*
+ * ut_sim.c
+ *
+ * an unreliable transport simulator
+ * (for testing replay databases and suchlike)
+ *
+ * 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 "ut_sim.h"
+#include "cipher_priv.h"
+
+int ut_compar(const void *a, const void *b)
+{
+    uint8_t r;
+    srtp_cipher_rand_for_tests(&r, sizeof(r));
+    return r > (UINT8_MAX / 2) ? -1 : 1;
+}
+
+void ut_init(ut_connection *utc)
+{
+    int i;
+    utc->index = 0;
+
+    for (i = 0; i < UT_BUF; i++)
+        utc->buffer[i] = i;
+
+    qsort(utc->buffer, UT_BUF, sizeof(uint32_t), ut_compar);
+
+    utc->index = UT_BUF - 1;
+}
+
+uint32_t ut_next_index(ut_connection *utc)
+{
+    uint32_t tmp;
+
+    tmp = utc->buffer[0];
+    utc->index++;
+    utc->buffer[0] = utc->index;
+
+    qsort(utc->buffer, UT_BUF, sizeof(uint32_t), ut_compar);
+
+    return tmp;
+}
+
+#ifdef UT_TEST
+
+#include <stdio.h>
+
+int main()
+{
+    uint32_t i, irecvd, idiff;
+    ut_connection utc;
+
+    ut_init(&utc);
+
+    for (i = 0; i < 1000; i++) {
+        irecvd = ut_next_index(&utc);
+        idiff = i - irecvd;
+        printf("%lu\t%lu\t%d\n", i, irecvd, idiff);
+    }
+
+    return 0;
+}
+
+#endif