diff --git a/crypto/test/CMakeLists.txt b/crypto/test/CMakeLists.txt
index 84a6174..8c75314 100644
--- a/crypto/test/CMakeLists.txt
+++ b/crypto/test/CMakeLists.txt
@@ -5,4 +5,5 @@
 
   file_test.cc
   malloc.cc
+  test_util.cc
 )
diff --git a/crypto/test/test_util.cc b/crypto/test/test_util.cc
new file mode 100644
index 0000000..8021aaa
--- /dev/null
+++ b/crypto/test/test_util.cc
@@ -0,0 +1,30 @@
+/* Copyright (c) 2015, Google Inc.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+ * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
+ * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+ * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
+
+#include <stdint.h>
+#include <stdio.h>
+
+#include "test_util.h"
+
+
+void hexdump(FILE *fp, const char *msg, const void *in, size_t len) {
+  const uint8_t *data = reinterpret_cast<const uint8_t*>(in);
+  size_t i;
+
+  fputs(msg, fp);
+  for (i = 0; i < len; i++) {
+    fprintf(fp, "%02x", data[i]);
+  }
+  fputs("\n", fp);
+}
diff --git a/crypto/test/test_util.h b/crypto/test/test_util.h
new file mode 100644
index 0000000..972e206
--- /dev/null
+++ b/crypto/test/test_util.h
@@ -0,0 +1,35 @@
+/* Copyright (c) 2015, Google Inc.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+ * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
+ * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+ * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
+
+#ifndef OPENSSL_HEADER_CRYPTO_TEST_TEST_UTIL_H
+#define OPENSSL_HEADER_CRYPTO_TEST_TEST_UTIL_H
+
+#include <stddef.h>
+#include <stdio.h>
+
+#if defined(__cplusplus)
+extern "C" {
+#endif
+
+
+/* hexdump writes |msg| to |fp| followed by the hex encoding of |len| bytes
+ * from |in|. */
+void hexdump(FILE *fp, const char *msg, const void *in, size_t len);
+
+
+#if defined(__cplusplus)
+}
+#endif
+
+#endif /* OPENSSL_HEADER_CRYPTO_TEST_TEST_UTIL_H */