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68 lines
1.8 KiB
C
68 lines
1.8 KiB
C
/* openpgp-s2ks.c - OpenPGP S2K helper functions
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* Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004,
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* 2005, 2006 Free Software Foundation, Inc.
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* Copyright (C) 2010, 2019 g10 Code GmbH
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*
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* This file is part of GnuPG.
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*
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* This file is free software; you can redistribute it and/or modify
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* it under the terms of either
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*
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* - the GNU Lesser General Public License as published by the Free
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* Software Foundation; either version 3 of the License, or (at
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* your option) any later version.
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*
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* or
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*
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* - the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* or both in parallel, as here.
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*
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* This file is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <https://www.gnu.org/licenses/>.
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*/
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#include <config.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <ctype.h>
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#include <assert.h>
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#include "util.h"
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#include "openpgpdefs.h"
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/* Pack an s2k iteration count into the form specified in RFC-4880.
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* If we're in between valid values, round up. */
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unsigned char
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encode_s2k_iterations (int iterations)
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{
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unsigned char c=0;
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unsigned char result;
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unsigned int count;
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if (iterations <= 1024)
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return 0; /* Command line arg compatibility. */
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if (iterations >= 65011712)
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return 255;
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/* Need count to be in the range 16-31 */
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for (count=iterations>>6; count>=32; count>>=1)
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c++;
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result = (c<<4)|(count-16);
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if (S2K_DECODE_COUNT(result) < iterations)
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result++;
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return result;
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}
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