/* mpih-rshift.c  -  MPI helper functions
 * Copyright (C) 1994, 1996, 1998, 1999,
 *               2000, 2001 Free Software Foundation, Inc.
 *
 * This file is part of GNUPG
 *
 * GNUPG is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * GNUPG is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
 *
 * Note: This code is heavily based on the GNU MP Library.
 *	 Actually it's the same code with only minor changes in the
 *	 way the data is stored; this is to support the abstraction
 *	 of an optional secure memory allocation which may be used
 *	 to avoid revealing of sensitive data due to paging etc.
 *	 The GNU MP Library itself is published under the LGPL;
 *	 however I decided to publish this code under the plain GPL.
 */

#include "mpi-internal.h"

/* Shift U (pointed to by UP and USIZE limbs long) CNT bits to the right
 * and store the USIZE least significant limbs of the result at WP.
 * The bits shifted out to the right are returned.
 *
 * Argument constraints:
 * 1. 0 < CNT < BITS_PER_MP_LIMB
 * 2. If the result is to be written over the input, WP must be <= UP.
 */

mpi_limb_t
mpihelp_rshift(mpi_ptr_t wp, mpi_ptr_t up, mpi_size_t usize, unsigned cnt)
{
	mpi_limb_t high_limb, low_limb;
	unsigned sh_1, sh_2;
	mpi_size_t i;
	mpi_limb_t retval;

	sh_1 = cnt;
	wp -= 1;
	sh_2 = BITS_PER_MPI_LIMB - sh_1;
	high_limb = up[0];
	retval = high_limb << sh_2;
	low_limb = high_limb;
	for (i = 1; i < usize; i++) {
		high_limb = up[i];
		wp[i] = (low_limb >> sh_1) | (high_limb << sh_2);
		low_limb = high_limb;
	}
	wp[i] = low_limb >> sh_1;

	return retval;
}
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/commit/?id=9208b75e048dda0d285904de9be7ab654a4b94fc'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/net?id=9208b75e048dda0d285904de9be7ab654a4b94fc'>net</a>/<a href='/cgit.cgi/linux/net-next.git/commit/net/bluetooth?id=9208b75e048dda0d285904de9be7ab654a4b94fc'>bluetooth</a>/<a href='/cgit.cgi/linux/net-next.git/commit/net/bluetooth/6lowpan.c?id=9208b75e048dda0d285904de9be7ab654a4b94fc'>6lowpan.c</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='9208b75e048dda0d285904de9be7ab654a4b94fc'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>James Bottomley &lt;James.Bottomley@HansenPartnership.com&gt;</td><td class='right'>2017-01-17 17:32:54 -0500</td></tr>
<tr><th>committer</th><td>James Bottomley &lt;James.Bottomley@HansenPartnership.com&gt;</td><td class='right'>2017-01-17 17:32:54 -0500</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/bluetooth/6lowpan.c?id=9208b75e048dda0d285904de9be7ab654a4b94fc'>9208b75e048dda0d285904de9be7ab654a4b94fc</a> (<a href='/cgit.cgi/linux/net-next.git/patch/net/bluetooth/6lowpan.c?id=9208b75e048dda0d285904de9be7ab654a4b94fc'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=9208b75e048dda0d285904de9be7ab654a4b94fc'>b3af58ccd11b9ea186d1388be263b8ae0cb829b3</a> /<a href='/cgit.cgi/linux/net-next.git/tree/net/bluetooth/6lowpan.c?id=9208b75e048dda0d285904de9be7ab654a4b94fc'>net/bluetooth/6lowpan.c</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/bluetooth/6lowpan.c?id=2f5a31456ee80b37ef1170319fa134af0a1dfcc4'>2f5a31456ee80b37ef1170319fa134af0a1dfcc4</a> (<a href='/cgit.cgi/linux/net-next.git/diff/net/bluetooth/6lowpan.c?id=9208b75e048dda0d285904de9be7ab654a4b94fc&amp;id2=2f5a31456ee80b37ef1170319fa134af0a1dfcc4'>diff</a>)</td></tr><tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/bluetooth/6lowpan.c?id=ffb58456589443ca572221fabbdef3db8483a779'>ffb58456589443ca572221fabbdef3db8483a779</a> (<a href='/cgit.cgi/linux/net-next.git/diff/net/bluetooth/6lowpan.c?id=9208b75e048dda0d285904de9be7ab654a4b94fc&amp;id2=ffb58456589443ca572221fabbdef3db8483a779'>diff</a>)</td></tr></table>
<div class='commit-subject'>Merge remote-tracking branch 'mkp-scsi/fixes' into fixes</div><div class='commit-msg'></div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=9208b75e048dda0d285904de9be7ab654a4b94fc'>Diffstat</a> (limited to 'net/bluetooth/6lowpan.c')</div><table summary='diffstat' class='diffstat'>