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<!--header start-->
<center><font size="2">The Open Group Base Specifications Issue 6<br>
IEEE Std 1003.1-2001<br>
Copyright &copy; 2001 The IEEE and The Open Group, All Rights reserved.</font></center>
<!--header end-->
<hr size="2" noshade>
<h4><a name="tag_03_654_01"></a>NAME</h4>
<blockquote>setkey - set encoding key (<b>CRYPT</b>)</blockquote>
<h4><a name="tag_03_654_02"></a>SYNOPSIS</h4>
<blockquote class="synopsis">
<div class="box"><code><tt><sup>[<a href="javascript:open_code('XSI')">XSI</a>]</sup> <img src="../images/opt-start.gif" alt=
"[Option Start]" border="0"> #include &lt;<a href="../basedefs/stdlib.h.html">stdlib.h</a>&gt;<br>
<br>
void setkey(const char *</tt><i>key</i><tt>); <img src="../images/opt-end.gif" alt="[Option End]" border="0"></tt></code></div>
<tt><br>
</tt></blockquote>
<h4><a name="tag_03_654_03"></a>DESCRIPTION</h4>
<blockquote>
<p>The <i>setkey</i>() function provides access to an implementation-defined encoding algorithm. The argument of <i>setkey</i>() is
an array of length 64 bytes containing only the bytes with numerical value of 0 and 1. If this string is divided into groups of 8,
the low-order bit in each group is ignored; this gives a 56-bit key which is used by the algorithm. This is the key that shall be
used with the algorithm to encode a string <i>block</i> passed to <a href="../functions/encrypt.html"><i>encrypt</i>()</a>.</p>
<p>The <i>setkey</i>() function shall not change the setting of <i>errno</i> if successful. An application wishing to check for
error situations should set <i>errno</i> to 0 before calling <i>setkey</i>(). If <i>errno</i> is non-zero on return, an error has
occurred.</p>
<p>The <i>setkey</i>() function need not be reentrant. A function that is not required to be reentrant is not required to be
thread-safe.</p>
</blockquote>
<h4><a name="tag_03_654_04"></a>RETURN VALUE</h4>
<blockquote>
<p>No values are returned.</p>
</blockquote>
<h4><a name="tag_03_654_05"></a>ERRORS</h4>
<blockquote>
<p>The <i>setkey</i>() function shall fail if:</p>
<dl compact>
<dt>[ENOSYS]</dt>
<dd>The functionality is not supported on this implementation.</dd>
</dl>
</blockquote>
<hr>
<div class="box"><em>The following sections are informative.</em></div>
<h4><a name="tag_03_654_06"></a>EXAMPLES</h4>
<blockquote>
<p>None.</p>
</blockquote>
<h4><a name="tag_03_654_07"></a>APPLICATION USAGE</h4>
<blockquote>
<p>Decoding need not be implemented in all environments. This is related to government restrictions in some countries on encryption
and decryption routines. Historical practice has been to ship a different version of the encryption library without the decryption
feature in the routines supplied. Thus the exported version of <a href="../functions/encrypt.html"><i>encrypt</i>()</a> does
encoding but not decoding.</p>
</blockquote>
<h4><a name="tag_03_654_08"></a>RATIONALE</h4>
<blockquote>
<p>None.</p>
</blockquote>
<h4><a name="tag_03_654_09"></a>FUTURE DIRECTIONS</h4>
<blockquote>
<p>None.</p>
</blockquote>
<h4><a name="tag_03_654_10"></a>SEE ALSO</h4>
<blockquote>
<p><a href="crypt.html"><i>crypt</i>()</a> , <a href="encrypt.html"><i>encrypt</i>()</a> , the Base Definitions volume of
IEEE&nbsp;Std&nbsp;1003.1-2001, <a href="../basedefs/stdlib.h.html"><i>&lt;stdlib.h&gt;</i></a></p>
</blockquote>
<h4><a name="tag_03_654_11"></a>CHANGE HISTORY</h4>
<blockquote>
<p>First released in Issue 1. Derived from Issue 1 of the SVID.</p>
</blockquote>
<h4><a name="tag_03_654_12"></a>Issue 5</h4>
<blockquote>
<p>The DESCRIPTION is updated to indicate that <i>errno</i> is not changed if the function is successful.</p>
</blockquote>
<div class="box"><em>End of informative text.</em></div>
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