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-<table class="head">
-  <tr>
-    <td class="head-ltitle">CRYPTO_BUFFER(9)</td>
-    <td class="head-vol">Kernel Developer's Manual</td>
-    <td class="head-rtitle">CRYPTO_BUFFER(9)</td>
-  </tr>
-</table>
-<div class="manual-text">
-<section class="Sh">
-<h1 class="Sh" id="NAME"><a class="permalink" href="#NAME">NAME</a></h1>
-<p class="Pp"><code class="Nm">crypto_buffer</code> &#x2014;
-    <span class="Nd">symmetric cryptographic request buffers</span></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="SYNOPSIS"><a class="permalink" href="#SYNOPSIS">SYNOPSIS</a></h1>
-<p class="Pp"><code class="In">#include
-    &lt;<a class="In">opencrypto/cryptodev.h</a>&gt;</code></p>
-<p class="Pp"><var class="Ft">int</var>
-  <br/>
-  <code class="Fn">crypto_apply</code>(<var class="Fa">struct cryptop
-    *crp</var>, <var class="Fa">int off</var>, <var class="Fa">int len</var>,
-    <var class="Fa">int (*f)(void *, void *, u_int)</var>, <var class="Fa">void
-    *arg</var>);</p>
-<p class="Pp"><var class="Ft">int</var>
-  <br/>
-  <code class="Fn">crypto_apply_buf</code>(<var class="Fa">struct crypto_buffer
-    *cb</var>, <var class="Fa">int off</var>, <var class="Fa">int len</var>,
-    <var class="Fa">int (*f)(void *, void *, u_int)</var>, <var class="Fa">void
-    *arg</var>);</p>
-<p class="Pp"><var class="Ft">void *</var>
-  <br/>
-  <code class="Fn">crypto_buffer_contiguous_subsegment</code>(<var class="Fa">struct
-    crypto_buffer *cb</var>, <var class="Fa">size_t skip</var>,
-    <var class="Fa">size_t len</var>);</p>
-<p class="Pp"><var class="Ft">size_t</var>
-  <br/>
-  <code class="Fn">crypto_buffer_len</code>(<var class="Fa" style="white-space: nowrap;">struct
-    crypto_buffer *cb</var>);</p>
-<p class="Pp"><var class="Ft">void *</var>
-  <br/>
-  <code class="Fn">crypto_contiguous_subsegment</code>(<var class="Fa">struct
-    cryptop *crp</var>, <var class="Fa">size_t skip</var>,
-    <var class="Fa">size_t len</var>);</p>
-<p class="Pp"><var class="Ft">void</var>
-  <br/>
-  <code class="Fn">crypto_cursor_init</code>(<var class="Fa">struct
-    crypto_buffer_cursor *cc</var>, <var class="Fa">const struct crypto_buffer
-    *cb</var>);</p>
-<p class="Pp"><var class="Ft">void</var>
-  <br/>
-  <code class="Fn">crypto_cursor_advance</code>(<var class="Fa" style="white-space: nowrap;">struct
-    crypto_buffer_cursor *cc</var>,
-    <var class="Fa" style="white-space: nowrap;">size_t amount</var>);</p>
-<p class="Pp"><var class="Ft">void</var>
-  <br/>
-  <code class="Fn">crypto_cursor_copyback</code>(<var class="Fa">struct
-    crypto_buffer_cursor *cc</var>, <var class="Fa">int size</var>,
-    <var class="Fa">const void *src</var>);</p>
-<p class="Pp"><var class="Ft">void</var>
-  <br/>
-  <code class="Fn">crypto_cursor_copydata</code>(<var class="Fa">struct
-    crypto_buffer_cursor *cc</var>, <var class="Fa">int size</var>,
-    <var class="Fa">void *dst</var>);</p>
-<p class="Pp"><var class="Ft">void</var>
-  <br/>
-  <code class="Fn">crypto_cursor_copydata_noadv</code>(<var class="Fa">struct
-    crypto_buffer_cursor *cc</var>, <var class="Fa">int size</var>,
-    <var class="Fa">void *dst</var>);</p>
-<p class="Pp"><var class="Ft">void *</var>
-  <br/>
-  <code class="Fn">crypto_cursor_segment</code>(<var class="Fa" style="white-space: nowrap;">struct
-    crypto_buffer_cursor *cc</var>,
-    <var class="Fa" style="white-space: nowrap;">size_t *len</var>);</p>
-<p class="Pp"><var class="Ft">void</var>
-  <br/>
-  <code class="Fn">crypto_cursor_copy</code>(<var class="Fa">const struct
-    crypto_buffer_cursor *fromc</var>, <var class="Fa">struct
-    crypto_buffer_cursor *toc</var>);</p>
-<p class="Pp"><var class="Ft">bool</var>
-  <br/>
-  <code class="Fn">CRYPTO_HAS_OUTPUT_BUFFER</code>(<var class="Fa" style="white-space: nowrap;">struct
-    cryptop *crp</var>);</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
-<p class="Pp">Symmetric cryptographic requests use data buffers to describe the
-    data to be modified. Requests can either specify a single data buffer whose
-    contents are modified in place, or requests may specify separate data
-    buffers for input and output. <var class="Vt">struct crypto_buffer</var>
-    provides an abstraction that permits cryptographic requests to operate on
-    different types of buffers. <var class="Vt">struct crypto_cursor</var>
-    allows cryptographic drivers to iterate over a data buffer.</p>
-<p class="Pp" id="CRYPTO_HAS_OUTPUT_BUFFER"><a class="permalink" href="#CRYPTO_HAS_OUTPUT_BUFFER"><code class="Fn">CRYPTO_HAS_OUTPUT_BUFFER</code></a>()
-    returns true if <var class="Fa">crp</var> uses separate buffers for input
-    and output and false if <var class="Fa">crp</var> uses a single buffer.</p>
-<p class="Pp" id="crypto_buffer_len"><a class="permalink" href="#crypto_buffer_len"><code class="Fn">crypto_buffer_len</code></a>()
-    returns the length of data buffer <var class="Fa">cb</var> in bytes.</p>
-<p class="Pp" id="crypto_apply_buf"><a class="permalink" href="#crypto_apply_buf"><code class="Fn">crypto_apply_buf</code></a>()
-    invokes a caller-supplied function to a region of the data buffer
-    <var class="Fa">cb</var>. The function <var class="Fa">f</var> is called one
-    or more times. For each invocation, the first argument to
-    <var class="Fa">f</var> is the value of <var class="Fa">arg</var> passed to
-    <code class="Fn">crypto_apply_buf</code>(). The second and third arguments
-    to <var class="Fa">f</var> are a pointer and length to a segment of the
-    buffer mapped into the kernel. The function is called enough times to cover
-    the <var class="Fa">len</var> bytes of the data buffer which starts at an
-    offset <var class="Fa">off</var>. If any invocation of
-    <var class="Fa">f</var> returns a non-zero value,
-    <code class="Fn">crypto_apply_buf</code>() immediately returns that value
-    without invoking <var class="Fa">f</var> on any remaining segments of the
-    region, otherwise <code class="Fn">crypto_apply_buf</code>() returns the
-    value from the final call to <var class="Fa">f</var>.
-    <a class="permalink" href="#crypto_apply"><code class="Fn" id="crypto_apply">crypto_apply</code></a>()
-    invokes the callback <var class="Fa">f</var> on a region of the input data
-    buffer for <var class="Fa">crp</var>.</p>
-<p class="Pp" id="crypto_buffer_contiguous_subsegment"><a class="permalink" href="#crypto_buffer_contiguous_subsegment"><code class="Fn">crypto_buffer_contiguous_subsegment</code></a>()
-    attempts to locate a single, virtually-contiguous segment of the data buffer
-    <var class="Fa">cb</var>. The segment must be <var class="Fa">len</var>
-    bytes long and start at an offset of <var class="Fa">skip</var> bytes. If a
-    segment is found, a pointer to the start of the segment is returned.
-    Otherwise, <code class="Dv">NULL</code> is returned.
-    <a class="permalink" href="#crypto_contiguous_subsegment"><code class="Fn" id="crypto_contiguous_subsegment">crypto_contiguous_subsegment</code></a>()
-    attempts to locate a single, virtually-contiguous segment in the input data
-    buffer for <var class="Fa">crp</var>.</p>
-<section class="Ss">
-<h2 class="Ss" id="Data_Buffers"><a class="permalink" href="#Data_Buffers">Data
-  Buffers</a></h2>
-<p class="Pp">Data buffers are described by an instance of
-    <var class="Vt">struct crypto buffer</var>. The
-    <var class="Fa">cb_type</var> member contains the type of the data buffer.
-    The following types are supported:</p>
-<dl class="Bl-tag">
-  <dt id="CRYPTO_BUF_NONE"><a class="permalink" href="#CRYPTO_BUF_NONE"><code class="Dv">CRYPTO_BUF_NONE</code></a></dt>
-  <dd>An invalid buffer. Used to mark the output buffer when a crypto request
-      uses a single data buffer.</dd>
-  <dt id="CRYPTO_BUF_CONTIG"><a class="permalink" href="#CRYPTO_BUF_CONTIG"><code class="Dv">CRYPTO_BUF_CONTIG</code></a></dt>
-  <dd>An array of bytes mapped into the kernel's address space.</dd>
-  <dt id="CRYPTO_BUF_UIO"><a class="permalink" href="#CRYPTO_BUF_UIO"><code class="Dv">CRYPTO_BUF_UIO</code></a></dt>
-  <dd>A scatter/gather list of kernel buffers as described in
-      <a class="Xr">uio(9)</a>.</dd>
-  <dt id="CRYPTO_BUF_MBUF"><a class="permalink" href="#CRYPTO_BUF_MBUF"><code class="Dv">CRYPTO_BUF_MBUF</code></a></dt>
-  <dd>A chain of network memory buffers as described in
-      <a class="Xr">mbuf(9)</a>.</dd>
-  <dt id="CRYPTO_BUF_SINGLE_MBUF"><a class="permalink" href="#CRYPTO_BUF_SINGLE_MBUF"><code class="Dv">CRYPTO_BUF_SINGLE_MBUF</code></a></dt>
-  <dd>A single network memory buffer as described in
-    <a class="Xr">mbuf(9)</a>.</dd>
-  <dt id="CRYPTO_BUF_VMPAGE"><a class="permalink" href="#CRYPTO_BUF_VMPAGE"><code class="Dv">CRYPTO_BUF_VMPAGE</code></a></dt>
-  <dd>A scatter/gather list of <var class="Vt">vm_page_t</var> structures
-      describing pages in the kernel's address space. This buffer type is only
-      available if <code class="Dv">CRYPTO_HAS_VMPAGE</code> is true.</dd>
-</dl>
-<p class="Pp">The structure also contains the following type-specific
-  fields:</p>
-<dl class="Bl-tag">
-  <dt><var class="Fa">cb_buf</var></dt>
-  <dd>A pointer to the start of a <code class="Dv">CRYPTO_BUF_CONTIG</code> data
-      buffer.</dd>
-  <dt><var class="Fa">cb_buf_len</var></dt>
-  <dd>The length of a <code class="Dv">CRYPTO_BUF_CONTIG</code> data buffer</dd>
-  <dt><var class="Fa">cb_mbuf</var></dt>
-  <dd>A pointer to a <var class="Vt">struct mbuf</var> for
-      <code class="Dv">CRYPTO_BUF_MBUF</code> and
-      <code class="Dv">CRYPTO_BUF_SINGLE_MBUF</code>.</dd>
-  <dt><var class="Fa">cb_uio</var></dt>
-  <dd>A pointer to a <var class="Vt">struct uio</var> for
-      <code class="Dv">CRYPTO_BUF_UIO</code>.</dd>
-  <dt><var class="Fa">cb_vm_page</var></dt>
-  <dd>A pointer to an array of <var class="Vt">struct vm_page</var> for
-      <code class="Dv">CRYPTO_BUF_VMPAGE</code>.</dd>
-  <dt><var class="Fa">cb_vm_page_len</var></dt>
-  <dd>The total amount of data included in the <var class="Fa">cb_vm_page</var>
-      array, in bytes.</dd>
-  <dt><var class="Fa">cb_vm_page_offset</var></dt>
-  <dd>Offset in bytes in the first page of <var class="Fa">cb_vm_page</var>
-      where valid data begins.</dd>
-</dl>
-</section>
-<section class="Ss">
-<h2 class="Ss" id="Cursors"><a class="permalink" href="#Cursors">Cursors</a></h2>
-<p class="Pp">Cursors provide a mechanism for iterating over a data buffer. They
-    are primarily intended for use in software drivers which access data buffers
-    via virtual addresses.</p>
-<p class="Pp" id="crypto_cursor_init"><a class="permalink" href="#crypto_cursor_init"><code class="Fn">crypto_cursor_init</code></a>()
-    initializes the cursor <var class="Fa">cc</var> to reference the start of
-    the data buffer <var class="Fa">cb</var>.</p>
-<p class="Pp" id="crypto_cursor_advance"><a class="permalink" href="#crypto_cursor_advance"><code class="Fn">crypto_cursor_advance</code></a>()
-    advances the cursor <var class="Fa">amount</var> bytes forward in the data
-    buffer.</p>
-<p class="Pp" id="crypto_cursor_copyback"><a class="permalink" href="#crypto_cursor_copyback"><code class="Fn">crypto_cursor_copyback</code></a>()
-    copies <var class="Fa">size</var> bytes from the local buffer pointed to by
-    <var class="Fa">src</var> into the data buffer associated with
-    <var class="Fa">cc</var>. The bytes are written to the current position of
-    <var class="Fa">cc</var>, and the cursor is then advanced by
-    <var class="Fa">size</var> bytes.</p>
-<p class="Pp" id="crypto_cursor_copydata"><a class="permalink" href="#crypto_cursor_copydata"><code class="Fn">crypto_cursor_copydata</code></a>()
-    copies <var class="Fa">size</var> bytes out of the data buffer associated
-    with <var class="Fa">cc</var> into a local buffer pointed to by
-    <var class="Fa">dst</var>. The bytes are read from the current position of
-    <var class="Fa">cc</var>, and the cursor is then advanced by
-    <var class="Fa">size</var> bytes.</p>
-<p class="Pp" id="crypto_cursor_copydata_noadv"><a class="permalink" href="#crypto_cursor_copydata_noadv"><code class="Fn">crypto_cursor_copydata_noadv</code></a>()
-    is similar to <code class="Fn">crypto_cursor_copydata</code>() except that
-    it does not change the current position of <var class="Fa">cc</var>.</p>
-<p class="Pp" id="crypto_cursor_segment"><a class="permalink" href="#crypto_cursor_segment"><code class="Fn">crypto_cursor_segment</code></a>()
-    returns the start of the virtually-contiguous segment at the current
-    position of <var class="Fa">cc</var>. The length of the segment is stored in
-    <var class="Fa">len</var>.</p>
-</section>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="RETURN_VALUES"><a class="permalink" href="#RETURN_VALUES">RETURN
-  VALUES</a></h1>
-<p class="Pp"><code class="Fn">crypto_apply</code>() and
-    <code class="Fn">crypto_apply_buf</code>() return the return value from the
-    caller-supplied callback function.</p>
-<p class="Pp"><code class="Fn">crypto_buffer_contiguous_subsegment</code>(),
-    <code class="Fn">crypto_contiguous_subsegment</code>(), and
-    <code class="Fn">crypto_cursor_segment</code>() return a pointer to a
-    contiguous segment or <code class="Dv">NULL</code>.</p>
-<p class="Pp"><code class="Fn">crypto_buffer_len</code>() returns the length of
-    a buffer in bytes.</p>
-<p class="Pp"><code class="Fn">crypto_cursor_seglen</code>() returns the length
-    in bytes of a contiguous segment.</p>
-<p class="Pp"><code class="Fn">crypto_cursor_copy</code>() makes a deep copy of
-    the cursor <var class="Fa">fromc</var>. The two copies do not share any
-    state and can thus be used independently.</p>
-<p class="Pp"><code class="Fn">CRYPTO_HAS_OUTPUT_BUFFER</code>() returns true if
-    the request uses a separate output buffer.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="SEE_ALSO"><a class="permalink" href="#SEE_ALSO">SEE
-  ALSO</a></h1>
-<p class="Pp"><a class="Xr">ipsec(4)</a>, <a class="Xr">crypto(7)</a>,
-    <a class="Xr">bus_dma(9)</a>, <a class="Xr">crypto(9)</a>,
-    <a class="Xr">crypto_driver(9)</a>, <a class="Xr">crypto_request(9)</a>,
-    <a class="Xr">crypto_session(9)</a>, <a class="Xr">mbuf(9)</a>,
-    <a class="Xr">uio(9)</a></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="HISTORY"><a class="permalink" href="#HISTORY">HISTORY</a></h1>
-<p class="Pp">The <code class="Nm">crypto_buffer</code> functions first appeared
-    in <span class="Ux">FreeBSD 13</span>.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="AUTHORS"><a class="permalink" href="#AUTHORS">AUTHORS</a></h1>
-<p class="Pp">The <code class="Nm">crypto_buffer</code> functions and this
-    manual page were written by <span class="An">John Baldwin</span>
-    &lt;<a class="Mt" href="mailto:jhb@FreeBSD.org">jhb@FreeBSD.org</a>&gt;.</p>
-</section>
-</div>
-<table class="foot">
-  <tr>
-    <td class="foot-date">February 11, 2022</td>
-    <td class="foot-os">FreeBSD 15.0</td>
-  </tr>
-</table>