diff --git a/ap/lib/libssl/openssl-1.1.1o/fuzz/x509.c b/ap/lib/libssl/openssl-1.1.1o/fuzz/x509.c
new file mode 100644
index 0000000..ceaec07
--- /dev/null
+++ b/ap/lib/libssl/openssl-1.1.1o/fuzz/x509.c
@@ -0,0 +1,53 @@
+/*
+ * Copyright 2016-2021 The OpenSSL Project Authors. All Rights Reserved.
+ *
+ * Licensed under the OpenSSL licenses, (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * https://www.openssl.org/source/license.html
+ * or in the file LICENSE in the source distribution.
+ */
+
+#include <openssl/x509.h>
+#include <openssl/bio.h>
+#include <openssl/err.h>
+#include <openssl/rand.h>
+#include "fuzzer.h"
+
+#include "rand.inc"
+
+int FuzzerInitialize(int *argc, char ***argv)
+{
+    OPENSSL_init_crypto(OPENSSL_INIT_LOAD_CRYPTO_STRINGS, NULL);
+    ERR_get_state();
+    CRYPTO_free_ex_index(0, -1);
+    FuzzerSetRand();
+    return 1;
+}
+
+int FuzzerTestOneInput(const uint8_t *buf, size_t len)
+{
+    const unsigned char *p = buf;
+    unsigned char *der = NULL;
+
+    X509 *x509 = d2i_X509(NULL, &p, len);
+    if (x509 != NULL) {
+        BIO *bio = BIO_new(BIO_s_null());
+        /* This will load and print the public key as well as extensions */
+        X509_print(bio, x509);
+        BIO_free(bio);
+
+        X509_issuer_and_serial_hash(x509);
+
+        i2d_X509(x509, &der);
+        OPENSSL_free(der);
+
+        X509_free(x509);
+    }
+    ERR_clear_error();
+    return 0;
+}
+
+void FuzzerCleanup(void)
+{
+}