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+<!DOCTYPE html>
+ <meta charset="utf-8"/>
+ <style>
+ table.head, table.foot { width: 100%; }
+ td.head-rtitle, td.foot-os { text-align: right; }
+ td.head-vol { text-align: center; }
+ div.Pp { margin: 1ex 0ex; }
+ </style>
+ <link rel="stylesheet" href="style.css" type="text/css" media="all"/>
+ <title>CRYPTO_HCHACHA20(3MONOCYPHER)</title>
+<table class="head">
+ <tr>
+ <td class="head-ltitle">CRYPTO_HCHACHA20(3MONOCYPHER)</td>
+ <td class="head-vol">3MONOCYPHER</td>
+ <td class="head-rtitle">CRYPTO_HCHACHA20(3MONOCYPHER)</td>
+ </tr>
+<div class="manual-text">
+<h1 class="Sh" title="Sh" id="NAME"><a class="selflink" href="#NAME">NAME</a></h1>
+<b class="Nm" title="Nm">crypto_hchacha20</b> &#x2014;
+ <span class="Nd" title="Nd">HChacha20 special-purpose hashing</span>
+<h1 class="Sh" title="Sh" id="SYNOPSIS"><a class="selflink" href="#SYNOPSIS">SYNOPSIS</a></h1>
+<b class="In" title="In">#include
+ &lt;<a class="In" title="In">monocypher.h</a>&gt;</b>
+<div class="Pp"></div>
+<var class="Ft" title="Ft">void</var>
+<b class="Fn" title="Fn">crypto_hchacha20</b>(<var class="Fa" title="Fa">uint8_t
+ out[32]</var>, <var class="Fa" title="Fa">const uint8_t key[32]</var>,
+ <var class="Fa" title="Fa">const uint8_t in[16]</var>);
+<h1 class="Sh" title="Sh" id="DESCRIPTION"><a class="selflink" href="#DESCRIPTION">DESCRIPTION</a></h1>
+<b class="Fn" title="Fn">crypto_hchacha20</b>() provides a not-so-cryptographic
+ hash. It may be used for some specific purposes, such as X25519 key
+ derivation, or XChacha20 initialisation. If in doubt, do not use directly. Use
+ <a class="Xr" title="Xr" href="crypto_blake2b.html">crypto_blake2b(3monocypher)</a>
+ instead.
+<div class="Pp"></div>
+The arguments are:
+<dl class="Bl-tag">
+ <dt class="It-tag">&#x00A0;</dt>
+ <dd class="It-tag">&#x00A0;</dd>
+ <dt class="It-tag"><var class="Fa" title="Fa">key</var></dt>
+ <dd class="It-tag">A sufficiently random key, such as the output of
+ <a class="Xr" title="Xr" href="crypto_x25519.html">crypto_x25519(3monocypher)</a>.</dd>
+ <dt class="It-tag">&#x00A0;</dt>
+ <dd class="It-tag">&#x00A0;</dd>
+ <dt class="It-tag"><var class="Fa" title="Fa">in</var></dt>
+ <dd class="It-tag">The space reserved for the Chacha20 nonce and counter. It
+ does not have to be random.</dd>
+ <dt class="It-tag">&#x00A0;</dt>
+ <dd class="It-tag">&#x00A0;</dd>
+ <dt class="It-tag"><var class="Fa" title="Fa">out</var></dt>
+ <dd class="It-tag">A cryptographically secure random number
+ <i class="Em" title="Em">if</i> there is enough entropy in
+ <var class="Fa" title="Fa">key</var>. X25519 shared secrets have enough
+ entropy.</dd>
+<h1 class="Sh" title="Sh" id="RETURN_VALUES"><a class="selflink" href="#RETURN_VALUES">RETURN
+ VALUES</a></h1>
+This function returns nothing.
+<h1 class="Sh" title="Sh" id="EXAMPLES"><a class="selflink" href="#EXAMPLES">EXAMPLES</a></h1>
+The following example assumes the existence of
+ <b class="Fn" title="Fn">arc4random_buf</b>(), which fills the given buffer
+ with cryptographically secure random bytes. If
+ <b class="Fn" title="Fn">arc4random_buf</b>() does not exist on your system,
+ see <a class="Xr" title="Xr" href="intro.html">intro(3monocypher)</a> for
+ advice about how to generate cryptographically secure random bytes.
+<div class="Pp"></div>
+Simple hash:
+<div class="Pp"></div>
+<div class="Bd" style="margin-left: 5.00ex;">
+<pre class="Li">
+uint8_t key[32]; /* Must have enough entropy */
+uint8_t in [16]; /* Does not have to be random */
+uint8_t out[32]; /* Will be random iff the above holds */
+arc4random_buf(key, 32);
+crypto_hchacha20(out, key, in);
+/* Wipe secrets if they are no longer needed */
+crypto_wipe(key, 32);
+crypto_wipe(in , 16);
+<h1 class="Sh" title="Sh" id="SEE_ALSO"><a class="selflink" href="#SEE_ALSO">SEE
+ ALSO</a></h1>
+<a class="Xr" title="Xr" href="crypto_chacha20_encrypt.html">crypto_chacha20_encrypt(3monocypher)</a>,
+ <a class="Xr" title="Xr" href="crypto_key_exchange.html">crypto_key_exchange(3monocypher)</a>,
+ <a class="Xr" title="Xr" href="intro.html">intro(3monocypher)</a>
+<h1 class="Sh" title="Sh" id="STANDARDS"><a class="selflink" href="#STANDARDS">STANDARDS</a></h1>
+This function implements HChacha20. HChacha20 derives from Chacha20 the same way
+ HSalsa20 derives from Salsa20.
+<h1 class="Sh" title="Sh" id="HISTORY"><a class="selflink" href="#HISTORY">HISTORY</a></h1>
+The <b class="Fn" title="Fn">crypto_hchacha20</b>() function first appeared in
+ Monocypher 0.1 as <b class="Fn" title="Fn">crypto_chacha20_H</b>(). It was
+ renamed to <b class="Fn" title="Fn">crypto_hchacha20</b>() in Monocypher
+ 3.0.0.
+<h1 class="Sh" title="Sh" id="CAVEATS"><a class="selflink" href="#CAVEATS">CAVEATS</a></h1>
+<b class="Sy" title="Sy">This is not a general-purpose cryptographic hash
+ function</b>.</div>
+<table class="foot">
+ <tr>
+ <td class="foot-date">March 2, 2020</td>
+ <td class="foot-os">Linux 4.15.0-106-generic</td>
+ </tr>