94 lines
4.8 KiB
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94 lines
4.8 KiB
HTML
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Copyright (C) 2021 Maxime Devos
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Copyright (C) 2024 Tomas Volf
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<title>Encryption (Guile Reference Manual)</title>
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<div class="subsection-level-extent" id="Encryption">
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<p>
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Previous: <a href="Locales.html" accesskey="p" rel="prev">Locales</a>, Up: <a href="POSIX.html" accesskey="u" rel="up"><abbr class="acronym">POSIX</abbr> System Calls and Networking</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html" title="Index" rel="index">Index</a>]</p>
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<h4 class="subsection" id="Encryption-1"><span>7.2.14 Encryption<a class="copiable-link" href="#Encryption-1"> ¶</a></span></h4>
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<a class="index-entry-id" id="index-encryption"></a>
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<p>Please note that the procedures in this section are not suited for
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strong encryption, they are only interfaces to the well-known and
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common system library functions of the same name. They are just as good
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(or bad) as the underlying functions, so you should refer to your system
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documentation before using them (see <a data-manual="libc" href="https://www.gnu.org/software/libc/manual/html_node/crypt.html#crypt">Encrypting Passwords</a> in <cite class="cite">The GNU C Library Reference Manual</cite>).
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</p>
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<dl class="first-deffn">
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<dt class="deffn" id="index-crypt"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">crypt</strong> <var class="def-var-arguments">key salt</var><a class="copiable-link" href="#index-crypt"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-scm_005fcrypt"><span class="category-def">C Function: </span><span><strong class="def-name">scm_crypt</strong> <var class="def-var-arguments">(key, salt)</var><a class="copiable-link" href="#index-scm_005fcrypt"> ¶</a></span></dt>
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<dd><p>Encrypt <var class="var">key</var>, with the addition of <var class="var">salt</var> (both strings),
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using the <code class="code">crypt</code> C library call.
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</p></dd></dl>
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<p>Although <code class="code">getpass</code> is not an encryption procedure per se, it
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appears here because it is often used in combination with <code class="code">crypt</code>:
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</p>
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<dl class="first-deffn">
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<dt class="deffn" id="index-getpass"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">getpass</strong> <var class="def-var-arguments">prompt</var><a class="copiable-link" href="#index-getpass"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-scm_005fgetpass"><span class="category-def">C Function: </span><span><strong class="def-name">scm_getpass</strong> <var class="def-var-arguments">(prompt)</var><a class="copiable-link" href="#index-scm_005fgetpass"> ¶</a></span></dt>
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<dd><a class="index-entry-id" id="index-password"></a>
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<p>Display <var class="var">prompt</var> to the standard error output and read
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a password from <samp class="file">/dev/tty</samp>. If this file is not
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accessible, it reads from standard input. The password may be
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up to 127 characters in length. Additional characters and the
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terminating newline character are discarded. While reading
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the password, echoing and the generation of signals by special
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characters is disabled.
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</p></dd></dl>
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