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Diffstat (limited to 'lib/mpi/generic_mpih-rshift.c')
| -rw-r--r-- | lib/mpi/generic_mpih-rshift.c | 50 |
1 files changed, 0 insertions, 50 deletions
diff --git a/lib/mpi/generic_mpih-rshift.c b/lib/mpi/generic_mpih-rshift.c deleted file mode 100644 index e07bc69aa898..000000000000 --- a/lib/mpi/generic_mpih-rshift.c +++ /dev/null @@ -1,50 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-or-later -/* mpih-rshift.c - MPI helper functions - * Copyright (C) 1994, 1996, 1998, 1999, - * 2000, 2001 Free Software Foundation, Inc. - * - * This file is part of GNUPG - * - * Note: This code is heavily based on the GNU MP Library. - * Actually it's the same code with only minor changes in the - * way the data is stored; this is to support the abstraction - * of an optional secure memory allocation which may be used - * to avoid revealing of sensitive data due to paging etc. - * The GNU MP Library itself is published under the LGPL; - * however I decided to publish this code under the plain GPL. - */ - -#include "mpi-internal.h" - -/* Shift U (pointed to by UP and USIZE limbs long) CNT bits to the right - * and store the USIZE least significant limbs of the result at WP. - * The bits shifted out to the right are returned. - * - * Argument constraints: - * 1. 0 < CNT < BITS_PER_MP_LIMB - * 2. If the result is to be written over the input, WP must be <= UP. - */ - -mpi_limb_t -mpihelp_rshift(mpi_ptr_t wp, mpi_ptr_t up, mpi_size_t usize, unsigned cnt) -{ - mpi_limb_t high_limb, low_limb; - unsigned sh_1, sh_2; - mpi_size_t i; - mpi_limb_t retval; - - sh_1 = cnt; - wp -= 1; - sh_2 = BITS_PER_MPI_LIMB - sh_1; - high_limb = up[0]; - retval = high_limb << sh_2; - low_limb = high_limb; - for (i = 1; i < usize; i++) { - high_limb = up[i]; - wp[i] = (low_limb >> sh_1) | (high_limb << sh_2); - low_limb = high_limb; - } - wp[i] = low_limb >> sh_1; - - return retval; -} |