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diff --git a/web/server/h2o/libh2o/deps/picotls/deps/cifra/src/pbkdf2.h b/web/server/h2o/libh2o/deps/picotls/deps/cifra/src/pbkdf2.h
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+++ b/web/server/h2o/libh2o/deps/picotls/deps/cifra/src/pbkdf2.h
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+/*
+ * 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 PBKDF2_H
+#define PBKDF2_H
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include "chash.h"
+
+/**
+ * PBKDF2-HMAC
+ * ===========
+ * This is PBKDF2 as described by PKCS#5/RFC2898 with HMAC as the PRF.
+ */
+
+/* .. c:function:: $DECL
+ * This computes PBKDF2-HMAC with the given hash functon.
+ *
+ * :param pw: password input buffer.
+ * :param npw: password length.
+ * :param salt: salt input buffer.
+ * :param nsalt: salt length.
+ * :param iterations: non-zero iteration count.  Tune this for performance/security tradeoff.
+ * :param out: key material output buffer. `nout` bytes are written here.
+ * :param nout: key material length.
+ * :param hash: hash function description.
+ */
+void cf_pbkdf2_hmac(const uint8_t *pw, size_t npw,
+                    const uint8_t *salt, size_t nsalt,
+                    uint32_t iterations,
+                    uint8_t *out, size_t nout,
+                    const cf_chash *hash);
+
+#endif