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diff --git a/deps/ngtcp2/crypto/shared.h b/deps/ngtcp2/crypto/shared.h
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+++ b/deps/ngtcp2/crypto/shared.h
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+/*
+ * ngtcp2
+ *
+ * Copyright (c) 2019 ngtcp2 contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+#ifndef NGTCP2_SHARED_H
+#define NGTCP2_SHARED_H
+
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif /* HAVE_CONFIG_H */
+
+#include <ngtcp2/ngtcp2_crypto.h>
+
+/**
+ * @function
+ *
+ * `ngtcp2_crypto_derive_initial_secrets` derives initial secrets.
+ * |rx_secret| and |tx_secret| must point to the buffer of at least 32
+ * bytes capacity.  rx for read and tx for write.  This function
+ * writes rx and tx secrets into |rx_secret| and |tx_secret|
+ * respectively.  The length of secret is 32 bytes long.
+ * |client_dcid| is the destination connection ID in first Initial
+ * packet of client.  If |initial_secret| is not NULL, the initial
+ * secret is written to it.  It must point to the buffer which has at
+ * least 32 bytes capacity.  The initial secret is 32 bytes long.
+ * |side| specifies the side of application.
+ *
+ * This function returns 0 if it succeeds, or -1.
+ */
+int ngtcp2_crypto_derive_initial_secrets(uint8_t *rx_secret, uint8_t *tx_secret,
+                                         uint8_t *initial_secret,
+                                         const ngtcp2_cid *client_dcid,
+                                         ngtcp2_crypto_side side);
+
+/**
+ * @function
+ *
+ * `ngtcp2_crypto_update_traffic_secret` derives the next generation
+ * of the traffic secret.  |secret| specifies the current secret and
+ * its length is given in |secretlen|.  The length of new key is the
+ * same as the current key.  This function writes new key into the
+ * buffer pointed by |dest|.  |dest| must have the enough capacity to
+ * store the new key.
+ *
+ * This function returns 0 if it succeeds, or -1.
+ */
+int ngtcp2_crypto_update_traffic_secret(uint8_t *dest,
+                                        const ngtcp2_crypto_md *md,
+                                        const uint8_t *secret,
+                                        size_t secretlen);
+
+#endif /* NGTCP2_SHARED_H */