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9bb0be2dbb
git-svn-id: svn+ssh://svn.berlios.de/svnroot/repos/libssh/trunk@74 7dcaeef0-15fb-0310-b436-a5af3365683c
77 lines
2.2 KiB
C
77 lines
2.2 KiB
C
/* gcrypt_missing.c */
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/* This file contains routines that are in OpenSSL but not in libgcrypt */
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/*
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Copyright 2003,04,06 Aris Adamantiadis
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This file is part of the SSH Library
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The SSH Library is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or (at your
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option) any later version.
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The SSH Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with the SSH Library; see the file COPYING. If not, write to
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the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
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MA 02111-1307, USA. */
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#include <stdlib.h>
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#include "libssh/priv.h"
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#ifdef HAVE_LIBGCRYPT
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int my_gcry_dec2bn(bignum *bn, const char *data)
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{
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int count;
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*bn = bignum_new();
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gcry_mpi_set_ui(*bn, 0);
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for (count = 0; data[count]; ++count)
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{
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gcry_mpi_mul_ui(*bn, *bn, 10);
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gcry_mpi_add_ui(*bn, *bn, data[count] - '0');
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}
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return count;
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}
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char *my_gcry_bn2dec(bignum bn)
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{
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int count, count2;
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int size, rsize;
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char *ret;
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bignum bndup, num, ten;
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char decnum;
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size = gcry_mpi_get_nbits(bn) * 3;
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rsize = size / 10 + size / 1000 + 2;
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ret = malloc(rsize + 1);
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if (!gcry_mpi_cmp_ui(bn, 0))
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strcpy(ret, "0");
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else
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{
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for (bndup = gcry_mpi_copy(bn), ten = bignum_new(), num = bignum_new(),
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bignum_set_word(ten, 10), count = rsize; count; --count)
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{
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gcry_mpi_div(bndup, num, bndup, ten, 0);
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for (decnum = 0, count2 = gcry_mpi_get_nbits(num); count2; decnum *= 2,
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decnum += (gcry_mpi_test_bit(num, count2 - 1) ? 1 : 0), --count2)
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;
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ret[count - 1] = decnum + '0';
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}
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for (count = 0; count < rsize && ret[count] == '0'; ++count)
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;
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for (count2 = 0; count2 < rsize - count; ++count2)
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ret[count2] = ret[count2 + count];
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ret[count2] = 0;
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bignum_free(num);
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bignum_free(bndup);
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bignum_free(ten);
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}
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return ret;
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}
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#endif
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