smg_comms_c_wrappers 1
smg_comms_c_wrappers 2 * Modified by No Such Labs. (C) 2015. See README.
smg_comms_c_wrappers 3 *
smg_comms_c_wrappers 4 * This file was originally part of Gnu Privacy Guard (GPG), ver. 1.4.10,
smg_comms_c_wrappers 5 * SHA256(gnupg-1.4.10.tar.gz):
smg_comms_c_wrappers 6 * 0bfd74660a2f6cedcf7d8256db4a63c996ffebbcdc2cf54397bfb72878c5a85a
smg_comms_c_wrappers 7 * (C) 1994-2005 Free Software Foundation, Inc.
smg_comms_c_wrappers 8 *
smg_comms_c_wrappers 9 * This program is free software: you can redistribute it and/or modify
smg_comms_c_wrappers 10 * it under the terms of the GNU General Public License as published by
smg_comms_c_wrappers 11 * the Free Software Foundation, either version 3 of the License, or
smg_comms_c_wrappers 12 * (at your option) any later version.
smg_comms_c_wrappers 13 *
smg_comms_c_wrappers 14 * This program is distributed in the hope that it will be useful,
smg_comms_c_wrappers 15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
smg_comms_c_wrappers 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
smg_comms_c_wrappers 17 * GNU General Public License for more details.
smg_comms_c_wrappers 18 *
smg_comms_c_wrappers 19 * You should have received a copy of the GNU General Public License
smg_comms_c_wrappers 20 * along with this program. If not, see <http:
smg_comms_c_wrappers 21 */
smg_comms_c_wrappers 22
smg_comms_c_wrappers 23 #include <stdio.h>
smg_comms_c_wrappers 24 #include <stdlib.h>
smg_comms_c_wrappers 25
smg_comms_c_wrappers 26 #include "knobs.h"
smg_comms_c_wrappers 27 #include "mpi-internal.h"
smg_comms_c_wrappers 28
smg_comms_c_wrappers 29
smg_comms_c_wrappers 30
smg_comms_c_wrappers 31 * and store the USIZE least significant limbs of the result at WP.
smg_comms_c_wrappers 32 * The bits shifted out to the right are returned.
smg_comms_c_wrappers 33 *
smg_comms_c_wrappers 34 * Argument constraints:
smg_comms_c_wrappers 35 * 1. 0 < CNT < BITS_PER_MP_LIMB
smg_comms_c_wrappers 36 * 2. If the result is to be written over the input, WP must be <= UP.
smg_comms_c_wrappers 37 */
smg_comms_c_wrappers 38
smg_comms_c_wrappers 39 mpi_limb_t
smg_comms_c_wrappers 40 mpihelp_rshift( mpi_ptr_t wp, mpi_ptr_t up, mpi_size_t usize, unsigned cnt)
smg_comms_c_wrappers 41 {
smg_comms_c_wrappers 42 mpi_limb_t high_limb, low_limb;
smg_comms_c_wrappers 43 unsigned sh_1, sh_2;
smg_comms_c_wrappers 44 mpi_size_t i;
smg_comms_c_wrappers 45 mpi_limb_t retval;
smg_comms_c_wrappers 46
smg_comms_c_wrappers 47 sh_1 = cnt;
smg_comms_c_wrappers 48 wp -= 1;
smg_comms_c_wrappers 49 sh_2 = BITS_PER_MPI_LIMB - sh_1;
smg_comms_c_wrappers 50 high_limb = up[0];
smg_comms_c_wrappers 51 retval = high_limb << sh_2;
smg_comms_c_wrappers 52 low_limb = high_limb;
smg_comms_c_wrappers 53 for( i=1; i < usize; i++) {
smg_comms_c_wrappers 54 high_limb = up[i];
smg_comms_c_wrappers 55 wp[i] = (low_limb >> sh_1) | (high_limb << sh_2);
smg_comms_c_wrappers 56 low_limb = high_limb;
smg_comms_c_wrappers 57 }
smg_comms_c_wrappers 58 wp[i] = low_limb >> sh_1;
smg_comms_c_wrappers 59
smg_comms_c_wrappers 60 return retval;
smg_comms_c_wrappers 61 }
smg_comms_c_wrappers 62