251 lines
5.2 KiB
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251 lines
5.2 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<HTML><HEAD><TITLE>Man page of DES_CRYPT</TITLE>
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</HEAD><BODY>
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<H1>DES_CRYPT</H1>
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Section: Linux Programmer's Manual (3)<BR>Updated: 2019-03-06<BR><A HREF="#index">Index</A>
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<A HREF="/cgi-bin/man/man2html">Return to Main Contents</A><HR>
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<A NAME="lbAB"> </A>
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<H2>NAME</H2>
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des_crypt, ecb_crypt, cbc_crypt, des_setparity, DES_FAILED - fast
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DES encryption
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<A NAME="lbAC"> </A>
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<H2>SYNOPSIS</H2>
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<PRE>
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<B>#include <<A HREF="file:///usr/include/rpc/des_crypt.h">rpc/des_crypt.h</A>></B>
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<B>int ecb_crypt(char *</B><I>key</I><B>, char *</B><I>data</I><B>, unsigned </B><I>datalen</I><B>,</B>
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<B> unsigned </B><I>mode</I><B>);</B>
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<B>int cbc_crypt(char *</B><I>key</I><B>, char *</B><I>data</I><B>, unsigned </B><I>datalen</I><B>,</B>
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<B> unsigned </B><I>mode</I><B>, char *</B><I>ivec</I><B>);</B>
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<B>void des_setparity(char *</B><I>key</I><B>);</B>
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<B>int DES_FAILED(int </B><I>status</I><B>);</B>
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</PRE>
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<A NAME="lbAD"> </A>
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<H2>DESCRIPTION</H2>
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<B>ecb_crypt</B>()
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and
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<B>cbc_crypt</B>()
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implement the
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NBS
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DES
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(Data Encryption Standard).
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These routines are faster and more general purpose than
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<B><A HREF="/cgi-bin/man/man2html?3+crypt">crypt</A></B>(3).
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They also are able to utilize
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DES
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hardware if it is available.
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<B>ecb_crypt</B>()
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encrypts in
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ECB
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(Electronic Code Book)
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mode, which encrypts blocks of data independently.
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<B>cbc_crypt</B>()
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encrypts in
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CBC
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(Cipher Block Chaining)
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mode, which chains together
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successive blocks.
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CBC
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mode protects against insertions, deletions and
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substitutions of blocks.
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Also, regularities in the clear text will
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not appear in the cipher text.
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<P>
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Here is how to use these routines.
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The first argument,
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<I>key</I>,
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is the 8-byte encryption key with parity.
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To set the key's parity, which for
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DES
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is in the low bit of each byte, use
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<B>des_setparity</B>().
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The second argument,
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<I>data</I>,
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contains the data to be encrypted or decrypted.
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The
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third argument,
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<I>datalen</I>,
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is the length in bytes of
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<I>data</I>,
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which must be a multiple of 8.
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The fourth argument,
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<I>mode</I>,
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is formed by ORing together some things.
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For the encryption direction OR in either
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<B>DES_ENCRYPT</B>
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or
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<B>DES_DECRYPT</B>.
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For software versus hardware
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encryption, OR in either
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<B>DES_HW</B>
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or
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<B>DES_SW</B>.
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If
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<B>DES_HW</B>
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is specified, and there is no hardware, then the encryption is performed
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in software and the routine returns
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<B>DESERR_NOHWDEVICE</B>.
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For
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<B>cbc_crypt</B>(),
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the argument
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<I>ivec</I>
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is the 8-byte initialization
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vector for the chaining.
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It is updated to the next initialization
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vector upon return.
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<A NAME="lbAE"> </A>
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<H2>RETURN VALUE</H2>
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<DL COMPACT>
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<DT id="1"><B>DESERR_NONE</B>
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<DD>
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No error.
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<DT id="2"><B>DESERR_NOHWDEVICE</B>
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<DD>
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Encryption succeeded, but done in software instead of the requested hardware.
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<DT id="3"><B>DESERR_HWERROR</B>
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<DD>
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An error occurred in the hardware or driver.
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<DT id="4"><B>DESERR_BADPARAM</B>
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<DD>
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Bad argument to routine.
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</DL>
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<P>
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Given a result status
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<I>stat</I>,
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the macro
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<B>DES_FAILED(</B><I>stat</I><B>)</B>
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is false only for the first two statuses.
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<A NAME="lbAF"> </A>
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<H2>VERSIONS</H2>
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These functions are present in
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glibc 2.1 and later.
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<A NAME="lbAG"> </A>
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<H2>VERSIONS</H2>
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Because they employ the DES block cipher,
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which is no longer considered secure,
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<B>ecb_crypt</B>(),
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<B>ecb_crypt</B>(),
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<B>crypt_r</B>(),
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and
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<B>des_setparity</B>()
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were removed in glibc 2.28.
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Applications should switch to a modern cryptography library, such as
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<B>libgcrypt</B>.
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<A NAME="lbAH"> </A>
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<H2>ATTRIBUTES</H2>
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For an explanation of the terms used in this section, see
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<B><A HREF="/cgi-bin/man/man2html?7+attributes">attributes</A></B>(7).
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<TABLE BORDER>
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<TR VALIGN=top><TD><B>Interface</B></TD><TD><B>Attribute</B></TD><TD><B>Value</B><BR></TD></TR>
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<TR VALIGN=top><TD>
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<B>ecb_crypt</B>(),
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<B>cbc_crypt</B>(),
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<B>des_setparity</B>()
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</TD><TD>Thread safety</TD><TD>MT-Safe<BR></TD></TR>
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</TABLE>
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<A NAME="lbAI"> </A>
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<H2>CONFORMING TO</H2>
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4.3BSD.
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Not in POSIX.1.
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<A NAME="lbAJ"> </A>
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<H2>SEE ALSO</H2>
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<B><A HREF="/cgi-bin/man/man2html?1+des">des</A></B>(1),
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<B><A HREF="/cgi-bin/man/man2html?3+crypt">crypt</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?3+xcrypt">xcrypt</A></B>(3)
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<A NAME="lbAK"> </A>
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<H2>COLOPHON</H2>
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This page is part of release 5.05 of the Linux
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<I>man-pages</I>
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project.
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A description of the project,
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information about reporting bugs,
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and the latest version of this page,
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can be found at
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<A HREF="https://www.kernel.org/doc/man-pages/.">https://www.kernel.org/doc/man-pages/.</A>
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<P>
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<HR>
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<A NAME="index"> </A><H2>Index</H2>
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<DL>
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<DT id="5"><A HREF="#lbAB">NAME</A><DD>
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<DT id="6"><A HREF="#lbAC">SYNOPSIS</A><DD>
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<DT id="7"><A HREF="#lbAD">DESCRIPTION</A><DD>
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<DT id="8"><A HREF="#lbAE">RETURN VALUE</A><DD>
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<DT id="9"><A HREF="#lbAF">VERSIONS</A><DD>
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<DT id="10"><A HREF="#lbAG">VERSIONS</A><DD>
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<DT id="11"><A HREF="#lbAH">ATTRIBUTES</A><DD>
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<DT id="12"><A HREF="#lbAI">CONFORMING TO</A><DD>
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<DT id="13"><A HREF="#lbAJ">SEE ALSO</A><DD>
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<DT id="14"><A HREF="#lbAK">COLOPHON</A><DD>
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</DL>
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<HR>
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This document was created by
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<A HREF="/cgi-bin/man/man2html">man2html</A>,
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using the manual pages.<BR>
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Time: 00:05:38 GMT, March 31, 2021
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</BODY>
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</HTML>
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