This file is indexed.

/usr/share/doc/libkcapi/html/API-kcapi-kdf-ctr.html is in libkcapi-doc 1.0.3-2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>kcapi_kdf_ctr</title><meta name="generator" content="DocBook XSL Stylesheets V1.79.1"><link rel="home" href="index.html" title="Linux Kernel Crypto API User Space Interface Library"><link rel="up" href="ch03s24.html" title="Key Derivation Functions"><link rel="prev" href="API-kcapi-kdf-fb.html" title="kcapi_kdf_fb"><link rel="next" href="API-kcapi-pbkdf.html" title="kcapi_pbkdf"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span class="phrase">kcapi_kdf_ctr</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-kcapi-kdf-fb.html">Prev</a> </td><th width="60%" align="center">Key Derivation Functions</th><td width="20%" align="right"> <a accesskey="n" href="API-kcapi-pbkdf.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-kcapi-kdf-ctr"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>kcapi_kdf_ctr — 
  Counter Mode Key Derivation Function
 </p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><div class="funcsynopsis"><table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">int32_t <b class="fsfunc">kcapi_kdf_ctr </b>(</code></td><td>struct kcapi_handle * <var class="pdparam">handle</var>, </td></tr><tr><td> </td><td>const uint8_t * <var class="pdparam">src</var>, </td></tr><tr><td> </td><td>uint32_t <var class="pdparam">slen</var>, </td></tr><tr><td> </td><td>uint8_t * <var class="pdparam">dst</var>, </td></tr><tr><td> </td><td>uint32_t <var class="pdparam">dlen</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1"><a name="idm5796"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>handle</code></em></span></dt><dd><p>
     [in] cipher handle allocated by caller. This cipher handle
     must be allocated with <code class="function">kcapi_md_init</code>. If the caller is interested in
     a KDF using a keyed message digest, the caller should also call
     <code class="function">kcapi_md_setkey</code> before invoking this function.
    </p></dd><dt><span class="term"><em class="parameter"><code>src</code></em></span></dt><dd><p>
     [in] Input data that should be transformed into a key (see below).
    </p></dd><dt><span class="term"><em class="parameter"><code>slen</code></em></span></dt><dd><p>
     [in] Length of the src input data.
    </p></dd><dt><span class="term"><em class="parameter"><code>dst</code></em></span></dt><dd><p>
     [out] Buffer to store the generated key in,
    </p></dd><dt><span class="term"><em class="parameter"><code>dlen</code></em></span></dt><dd><p>
     [in] Length of the dst buffer. This value defines the number of bytes
     generated by the KDF.
    </p></dd></dl></div></div><div class="refsect1"><a name="idm5826"></a><h2>Description</h2><p>
   This function is an implementation of the KDF in counter mode according to
   SP800-108 section 5.1 as well as SP800-56A section 5.8.1 (Single-step KDF).
   </p><p>

   SP800-108:
   The caller must provide Label || 0x00 || Context in src. This src pointer
   may also be NULL if the caller wishes not to provide anything.
   </p><p>

   SP800-56A:
   If a keyed MAC is used, the key shall NOT be the shared secret from the DH
   operation, but an independently generated key. The src pointer is defined
   as Z || other info where Z is the shared secret from DH and other info is an
   arbitrary string (see SP800-56A section 5.8.1.2).
   </p><p>

   <em class="parameter"><code>return</code></em> 0 upon success;
   a negative errno-style error code if an error occurred
</p></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="API-kcapi-kdf-fb.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="ch03s24.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="API-kcapi-pbkdf.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><span class="phrase">kcapi_kdf_fb</span> </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> <span class="phrase">kcapi_pbkdf</span></td></tr></table></div></body></html>