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diff --git a/web/server/h2o/libh2o/deps/picotls/deps/cifra/src/chacha20poly1305.h b/web/server/h2o/libh2o/deps/picotls/deps/cifra/src/chacha20poly1305.h
deleted file mode 100644
index 1d44156ca..000000000
--- a/web/server/h2o/libh2o/deps/picotls/deps/cifra/src/chacha20poly1305.h
+++ /dev/null
@@ -1,73 +0,0 @@
-/*
- * cifra - embedded cryptography library
- * Written in 2014 by Joseph Birr-Pixton <jpixton@gmail.com>
- *
- * To the extent possible under law, the author(s) have dedicated all
- * copyright and related and neighboring rights to this software to the
- * public domain worldwide. This software is distributed without any
- * warranty.
- *
- * You should have received a copy of the CC0 Public Domain Dedication
- * along with this software. If not, see
- * <http://creativecommons.org/publicdomain/zero/1.0/>.
- */
-
-#ifndef CHACHA20POLY1305_H
-#define CHACHA20POLY1305_H
-
-#include <stdint.h>
-#include <stddef.h>
-
-/**
- * The ChaCha20-Poly1305 AEAD construction
- * =======================================
- * This is a composition of the ChaCha20 stream cipher and
- * the Poly1305 polynomial MAC to form an AEAD.
- * It's specified for use in TLS in the form of RFC7539.
- *
- * It uses a 256-bit key and a 96-bit nonce.
- *
- * This is a one-shot interface.
- */
-
-/* .. c:function:: $DECL
- * ChaCha20-Poly1305 authenticated encryption.
- *
- * :param key: key material.
- * :param nonce: per-message nonce.
- * :param header: header buffer.
- * :param nheader: number of header bytes.
- * :param plaintext: plaintext bytes to be encrypted.
- * :param nbytes: number of plaintext/ciphertext bytes.
- * :param ciphertext: ciphertext output buffer, nbytes in length.
- * :param tag: authentication tag output buffer.
- */
-void cf_chacha20poly1305_encrypt(const uint8_t key[32],
-                                 const uint8_t nonce[12],
-                                 const uint8_t *header, size_t nheader,
-                                 const uint8_t *plaintext, size_t nbytes,
-                                 uint8_t *ciphertext,
-                                 uint8_t tag[16]);
-
-/* .. c:function:: $DECL
- * ChaCha20-Poly1305 authenticated decryption.
- *
- * :return: 0 on success, non-zero on error.  Plaintext is zeroed on error.
- *
- * :param key: key material.
- * :param nonce: per-message nonce.
- * :param header: header buffer.
- * :param nheader: number of header bytes.
- * :param ciphertext: ciphertext bytes to be decrypted.
- * :param nbytes: number of plaintext/ciphertext bytes.
- * :param plaintext: plaintext output buffer, nbytes in length.
- * :param tag: authentication tag output buffer.
- */
-int cf_chacha20poly1305_decrypt(const uint8_t key[32],
-                                const uint8_t nonce[12],
-                                const uint8_t *header, size_t nheader,
-                                const uint8_t *ciphertext, size_t nbytes,
-                                const uint8_t tag[16],
-                                uint8_t *plaintext);
-
-#endif