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+<!DOCTYPE html>
+<html>
+<head>
+ <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_HMAC_SHA512(3MONOCYPHER)</title>
+</head>
+<body>
+<table class="head">
+ <tr>
+ <td class="head-ltitle">CRYPTO_HMAC_SHA512(3MONOCYPHER)</td>
+ <td class="head-vol">3MONOCYPHER</td>
+ <td class="head-rtitle">CRYPTO_HMAC_SHA512(3MONOCYPHER)</td>
+ </tr>
+</table>
+<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_hmac_sha512</b>,
+ <b class="Nm" title="Nm">crypto_hmac_sha512_init</b>,
+ <b class="Nm" title="Nm">crypto_hmac_sha512_update</b>,
+ <b class="Nm" title="Nm">crypto_hmac_sha512_final</b> &#x2014;
+ <span class="Nd" title="Nd">cryptographic hash-based message authentication
+ code with SHA-512</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-ed25519.h</a>&gt;</b>
+<div class="Pp"></div>
+<var class="Ft" title="Ft">void</var>
+<br/>
+<b class="Fn" title="Fn">crypto_hmac_sha512</b>(<var class="Fa" title="Fa">uint8_t
+ hmac[64]</var>, <var class="Fa" title="Fa">const uint8_t *key</var>,
+ <var class="Fa" title="Fa">size_t key_size</var>,
+ <var class="Fa" title="Fa">const uint8_t *message</var>,
+ <var class="Fa" title="Fa">size_t message_size</var>);
+<div class="Pp"></div>
+<var class="Ft" title="Ft">void</var>
+<br/>
+<b class="Fn" title="Fn">crypto_hmac_sha512_init</b>(<var class="Fa" title="Fa">crypto_hmac_sha512_ctx
+ *ctx</var>, <var class="Fa" title="Fa">const uint8_t *key</var>,
+ <var class="Fa" title="Fa">size_t key_size</var>);
+<div class="Pp"></div>
+<var class="Ft" title="Ft">void</var>
+<br/>
+<b class="Fn" title="Fn">crypto_hmac_sha512_update</b>(<var class="Fa" title="Fa">crypto_hmac_sha512_ctx
+ *ctx</var>, <var class="Fa" title="Fa">const uint8_t *message</var>,
+ <var class="Fa" title="Fa">size_t message_size</var>);
+<div class="Pp"></div>
+<var class="Ft" title="Ft">void</var>
+<br/>
+<b class="Fn" title="Fn">crypto_hmac_sha512_final</b>(<var class="Fa" title="Fa">crypto_hmac_sha512_ctx
+ *ctx</var>, <var class="Fa" title="Fa">uint8_t hmac[64]</var>);
+<h1 class="Sh" title="Sh" id="DESCRIPTION"><a class="selflink" href="#DESCRIPTION">DESCRIPTION</a></h1>
+HMAC with SHA-512 is a cryptographically secure message authentication code
+ (MAC), provided to enable compatibility with other cryptographic systems. It
+ is generally recommended to use
+ <a class="Xr" title="Xr" href="crypto_blake2b_general.html">crypto_blake2b_general(3monocypher)</a>
+ instead, as it performs faster on x86_64 CPUs.
+<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">hmac</var></dt>
+ <dd class="It-tag">The output MAC, which is always 64 bytes long.</dd>
+ <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">Some secret key. One cannot predict the final hash without
+ it. Users may want to wipe the key with
+ <a class="Xr" title="Xr" href="crypto_wipe.html">crypto_wipe(3monocypher)</a>
+ once they are done with it.</dd>
+ <dt class="It-tag">&#x00A0;</dt>
+ <dd class="It-tag">&#x00A0;</dd>
+ <dt class="It-tag"><var class="Fa" title="Fa">key_size</var></dt>
+ <dd class="It-tag">Length of <var class="Fa" title="Fa">key</var>, in bytes.
+ 32 is a good default. Keys longer than 128 bytes will be reduced to 64
+ bytes by hashing the key with SHA-512.</dd>
+ <dt class="It-tag">&#x00A0;</dt>
+ <dd class="It-tag">&#x00A0;</dd>
+ <dt class="It-tag"><var class="Fa" title="Fa">message</var></dt>
+ <dd class="It-tag">The message to compute the HMAC for. May overlap with
+ <var class="Fa" title="Fa">hmac</var>. May be
+ <code class="Dv" title="Dv">NULL</code> if
+ <var class="Fa" title="Fa">message_size</var> is 0.</dd>
+ <dt class="It-tag">&#x00A0;</dt>
+ <dd class="It-tag">&#x00A0;</dd>
+ <dt class="It-tag"><var class="Fa" title="Fa">message_size</var></dt>
+ <dd class="It-tag">Length of <var class="Fa" title="Fa">message</var>, in
+ bytes.</dd>
+</dl>
+<div class="Pp"></div>
+An incremental interface is provided. It is useful for handling streams of data
+ or large files without using too much memory. This interface uses three steps:
+<ul class="Bl-bullet">
+ <li class="It-bullet">initialisation with
+ <b class="Fn" title="Fn">crypto_hmac_sha512_init</b>(), which sets up a
+ context with the hashing parameters;</li>
+ <li class="It-bullet">update with
+ <b class="Fn" title="Fn">crypto_hmac_sha512_update</b>(), which hashes the
+ message chunk by chunk, and keep the intermediary result in the
+ context;</li>
+ <li class="It-bullet">and finalisation with
+ <b class="Fn" title="Fn">crypto_hmac_sha512_final</b>(), which produces
+ the final hash. The
+ <var class="Ft" title="Ft">crypto_hmac_sha512_ctx</var> is automatically
+ wiped upon finalisation.</li>
+</ul>
+<div class="Pp"></div>
+<b class="Fn" title="Fn">crypto_hmac_sha512</b>() is a convenience function that
+ performs <b class="Fn" title="Fn">crypto_hmac_sha512_init</b>(),
+ <b class="Fn" title="Fn">crypto_hmac_sha512_update</b>(), and
+ <b class="Fn" title="Fn">crypto_hmac_sha512_final</b>().
+<div class="Pp"></div>
+MACs may be truncated safely down to at most 16 bytes; the
+ <a class="Xr" title="Xr" href="crypto_verify64.html">crypto_verify64(3monocypher)</a>,
+ <a class="Xr" title="Xr" href="crypto_verify32.html">crypto_verify32(3monocypher)</a>,
+ and
+ <a class="Xr" title="Xr" href="crypto_verify16.html">crypto_verify16(3monocypher)</a>
+ functions can be used to to compare (possibly truncated) MACs.
+<h1 class="Sh" title="Sh" id="RETURN_VALUES"><a class="selflink" href="#RETURN_VALUES">RETURN
+ VALUES</a></h1>
+These functions return nothing.
+<h1 class="Sh" title="Sh" id="EXAMPLES"><a class="selflink" href="#EXAMPLES">EXAMPLES</a></h1>
+The following examples assume 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>
+Computing a message authentication code all at once:
+<div class="Pp"></div>
+<div class="Bd" style="margin-left: 5.00ex;">
+<pre class="Li">
+uint8_t hash [64]; /* Output hash (between 1 and 64 bytes) */
+uint8_t key [32]; /* Key (at least 1 byte) */
+uint8_t message[10] = &quot;Lorem ipsu&quot;; /* Message to authenticate */
+arc4random_buf(key, 32);
+crypto_hmac_sha512(hash, key, 32, message, 500);
+/* Wipe secrets if they are no longer needed */
+crypto_wipe(message, 500);
+crypto_wipe(key, 32);
+</pre>
+</div>
+<div class="Pp"></div>
+Computing a message authentication code incrementally:
+<div class="Pp"></div>
+<div class="Bd" style="margin-left: 5.00ex;">
+<pre class="Li">
+uint8_t hash [64]; /* Output hash (between 1 and 64 bytes) */
+uint8_t key [32]; /* Key (at least 1 byte) */
+uint8_t message[500] = {1}; /* Message to authenticate */
+crypto_hmac_sha512_ctx ctx;
+arc4random_buf(key, 32);
+crypto_hmac_sha512_init(&amp;ctx, key, 32);
+/* Wipe the key */
+crypto_wipe(key, 32);
+for (size_t i = 0; i &lt; 500; i += 100) {
+ crypto_hmac_sha512_update(&amp;ctx, message + i, 100);
+ /* Wipe secrets if they are no longer needed */
+ crypto_wipe(message + i, 100);
+}
+crypto_hmac_sha512_final(&amp;ctx, hash);
+</pre>
+</div>
+<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_blake2b.html">crypto_blake2b(3monocypher)</a>,
+ <a class="Xr" title="Xr" href="crypto_lock.html">crypto_lock(3monocypher)</a>,
+ <a class="Xr" title="Xr" href="crypto_poly1305.html">crypto_poly1305(3monocypher)</a>,
+ <a class="Xr" title="Xr" href="crypto_sha512.html">crypto_sha512(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>
+These functions implement HMAC with SHA-512. HMAC and SHA-512 itself are
+ described in RFC 6234; SHA-512 is also described in the Federal Information
+ Processing Standard (FIPS) 180-4; HMAC is also described in FIPS 198-1.
+<h1 class="Sh" title="Sh" id="HISTORY"><a class="selflink" href="#HISTORY">HISTORY</a></h1>
+The <b class="Fn" title="Fn">crypto_hmac_sha512</b>(),
+ <b class="Fn" title="Fn">crypto_hmac_sha512_init</b>(),
+ <b class="Fn" title="Fn">crypto_hmac_sha512_update</b>(), and
+ <b class="Fn" title="Fn">crypto_hmac_sha512_final</b>() functions first
+ appeared in Monocypher 3.0.0.</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>
+</table>
+</body>
+</html>