1 /* mpi-cmp.c - MPI functions 2 * Copyright (C) 1998, 1999 Free Software Foundation, Inc. 3 * 4 * This file is part of GnuPG. 5 * 6 * GnuPG is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * GnuPG is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA 19 */ 20 21 #include <linux/export.h> 22 23 #include "mpi-internal.h" 24 25 int mpi_cmp_ui(MPI u, unsigned long v) 26 { 27 mpi_limb_t limb = v; 28 29 mpi_normalize(u); 30 if (u->nlimbs == 0) { 31 if (v == 0) 32 return 0; 33 else 34 return -1; 35 } 36 if (u->sign) 37 return -1; 38 if (u->nlimbs > 1) 39 return 1; 40 41 if (u->d[0] == limb) 42 return 0; 43 else if (u->d[0] > limb) 44 return 1; 45 else 46 return -1; 47 } 48 EXPORT_SYMBOL_GPL(mpi_cmp_ui); 49 50 int mpi_cmp(MPI u, MPI v) 51 { 52 mpi_size_t usize, vsize; 53 int cmp; 54 55 mpi_normalize(u); 56 mpi_normalize(v); 57 usize = u->nlimbs; 58 vsize = v->nlimbs; 59 if (!u->sign && v->sign) 60 return 1; 61 if (u->sign && !v->sign) 62 return -1; 63 if (usize != vsize && !u->sign && !v->sign) 64 return usize - vsize; 65 if (usize != vsize && u->sign && v->sign) 66 return vsize - usize; 67 if (!usize) 68 return 0; 69 cmp = mpihelp_cmp(u->d, v->d, usize); 70 if (u->sign) 71 return -cmp; 72 return cmp; 73 } 74 EXPORT_SYMBOL_GPL(mpi_cmp); 75