102 строки
2.5 KiB
C
102 строки
2.5 KiB
C
/*
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* gcrypt_missing.c - routines that are in OpenSSL but not in libgcrypt.
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*
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* This file is part of the SSH Library
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*
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* Copyright (c) 2003-2006 by Aris Adamantiadis
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*
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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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*
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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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*
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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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*/
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#include <stdlib.h>
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#include "libssh/priv.h"
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#include "libssh/libgcrypt.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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int count;
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*bn = bignum_new();
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if (*bn == NULL) {
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return 0;
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}
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gcry_mpi_set_ui(*bn, 0);
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for (count = 0; data[count]; count++) {
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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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bignum bndup, num, ten;
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char *ret;
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int count, count2;
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int size, rsize;
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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 (ret == NULL) {
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return NULL;
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}
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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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ten = bignum_new();
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if (ten == NULL) {
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SAFE_FREE(ret);
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return NULL;
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}
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num = bignum_new();
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if (num == NULL) {
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SAFE_FREE(ret);
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bignum_free(ten);
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return NULL;
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}
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for (bndup = gcry_mpi_copy(bn), bignum_set_word(ten, 10), count = rsize;
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count; count--) {
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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;
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decnum *= 2, decnum += (gcry_mpi_test_bit(num, count2 - 1) ? 1 : 0),
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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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}
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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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/* vim: set ts=2 sw=2 et cindent: */
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