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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<title>The Libgcrypt Reference Manual: Configuration</title>

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<body lang="en">
<a name="Configuration"></a>
<div class="header">
<p>
Next: <a href="Architecture.html#Architecture" accesskey="n" rel="next">Architecture</a>, Previous: <a href="Tools.html#Tools" accesskey="p" rel="prev">Tools</a>, Up: <a href="index.html#Top" accesskey="u" rel="up">Top</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
</div>
<hr>
<a name="Configuration-files-and-evironment-variables"></a>
<h2 class="chapter">16 Configuration files and evironment variables</h2>

<p>This chapter describes which files and environment variables can be
used to change the behaviour of Libgcrypt.
</p>
<p>The environment variables considered by Libgcrypt are:
</p>
<dl compact="compact">
<dt><code>GCRYPT_BARRETT</code></dt>
<dd><a name="index-GCRYPT_005fBARRETT"></a>
<p>By setting this variable to any value a different algorithm for
modular reduction is used for ECC.
</p>
</dd>
<dt><code>GCRYPT_RNDUNIX_DBG</code></dt>
<dt><code>GCRYPT_RNDUNIX_DBGALL</code></dt>
<dd><a name="index-GCRYPT_005fRNDUNIX_005fDBG"></a>
<a name="index-GCRYPT_005fRNDUNIX_005fDBGALL"></a>
<p>These two environment variables are used to enable debug output for
the rndunix entropy gatherer, which is used on systems lacking a
/dev/random device.  The value of <code>GCRYPT_RNDUNIX_DBG</code> is a file
name or <code>-</code> for stdout.  Debug output is the written to this
file.  By setting <code>GCRYPT_RNDUNIX_DBGALL</code> to any value the debug
output will be more verbose.
</p>
</dd>
<dt><code>GCRYPT_RNDW32_NOPERF</code></dt>
<dd><a name="index-GCRYPT_005fRNDW32_005fNOPERF"></a>
<p>Setting this environment variable on Windows to any value disables
the use of performance data (<code>HKEY_PERFORMANCE_DATA</code>) as source
for entropy.  On some older Windows systems this could help to speed
up the creation of random numbers but also decreases the amount of
data used to init the random number generator.
</p>
</dd>
<dt><code>HOME</code></dt>
<dd><a name="index-HOME"></a>
<p>This is used to locate the socket to connect to the EGD random
daemon.  The EGD can be used on system without a /dev/random to speed
up the random number generator.  It is not needed on the majority of
today&rsquo;s operating systems and support for EGD requires the use of a
configure option at build time.
</p>
</dd>
</dl>

<p>The files which Libgcrypt uses to retrieve system information and the
files which can be created by the user to modify Libgcrypt&rsquo;s behavior
are:
</p>
<dl compact="compact">
<dt><samp>/etc/gcrypt/hwf.deny</samp></dt>
<dd><a name="index-_002fetc_002fgcrypt_002fhwf_002edeny"></a>
<p>This file can be used to disable the use of hardware based
optimizations, see <a href="Hardware-features.html#hardware-features">hardware features</a>.
</p>
</dd>
<dt><samp>/etc/gcrypt/fips_enabled</samp></dt>
<dt><samp>/proc/sys/crypto/fips_enabled</samp></dt>
<dd><a name="index-_002fetc_002fgcrypt_002ffips_005fenabled"></a>
<a name="index-fips_005fenabled"></a>
<p>On Linux these files are used to enable FIPS mode, see <a href="Enabling-FIPS-mode.html#enabling-fips-mode">enabling fips mode</a>.
</p>
</dd>
<dt><samp>/proc/cpuinfo</samp></dt>
<dt><samp>/proc/self/auxv</samp></dt>
<dd><a name="index-_002fproc_002fcpuinfo"></a>
<a name="index-_002fproc_002fself_002fauxv"></a>
<p>On Linux running on the ARM architecture, these files are used to read
hardware capabilities of the CPU.
</p>
</dd>
</dl>


<hr>
<div class="header">
<p>
Next: <a href="Architecture.html#Architecture" accesskey="n" rel="next">Architecture</a>, Previous: <a href="Tools.html#Tools" accesskey="p" rel="prev">Tools</a>, Up: <a href="index.html#Top" accesskey="u" rel="up">Top</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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