From 55aefe3378aea76c3bfe3bf290d8b7d74bed133a Mon Sep 17 00:00:00 2001 From: Werner Koch Date: Wed, 26 Nov 1997 21:06:44 +0000 Subject: changed the dir layout --- mpi/mpi-inline.h | 127 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 127 insertions(+) create mode 100644 mpi/mpi-inline.h (limited to 'mpi/mpi-inline.h') diff --git a/mpi/mpi-inline.h b/mpi/mpi-inline.h new file mode 100644 index 00000000..4d19942a --- /dev/null +++ b/mpi/mpi-inline.h @@ -0,0 +1,127 @@ +/* mpi-inline.h - Internal to the Multi Precision Integers + * Copyright (c) 1997 by Werner Koch (dd9jn) + * Copyright (C) 1994, 1996 Free Software Foundation, Inc. + * + * This file is part of G10. + * + * G10 is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * G10 is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA + * + * 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. + */ + +#ifndef G10_MPI_INLINE_H +#define G10_MPI_INLINE_H + + +extern __inline__ mpi_limb_t +mpihelp_add_1( mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr, + mpi_size_t s1_size, mpi_limb_t s2_limb) +{ + mpi_limb_t x; + + x = *s1_ptr++; + s2_limb += x; + *res_ptr++ = s2_limb; + if( s2_limb < x ) { /* sum is less than the left operand: handle carry */ + while( --s1_size ) { + x = *s1_ptr++ + 1; /* add carry */ + *res_ptr++ = x; /* and store */ + if( x ) /* not 0 (no overflow): we can stop */ + goto leave; + } + return 1; /* return carry (size of s1 to small) */ + } + + leave: + if( res_ptr != s1_ptr ) { /* not the same variable */ + mpi_size_t i; /* copy the rest */ + for( i=0; i < s1_size-1; i++ ) + res_ptr[i] = s1_ptr[i]; + } + return 0; /* no carry */ +} + + + +extern __inline__ mpi_limb_t +mpihelp_add(mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr, mpi_size_t s1_size, + mpi_ptr_t s2_ptr, mpi_size_t s2_size) +{ + mpi_limb_t cy = 0; + + if( s2_size ) + cy = mpihelp_add_n( res_ptr, s1_ptr, s2_ptr, s2_size ); + + if( s1_size - s2_size ) + cy = mpihelp_add_1( res_ptr + s2_size, s1_ptr + s2_size, + s1_size - s2_size, cy); + return cy; +} + + +extern __inline__ mpi_limb_t +mpihelp_sub_1(mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr, + mpi_size_t s1_size, mpi_limb_t s2_limb ) +{ + mpi_limb_t x; + + x = *s1_ptr++; + s2_limb = x - s2_limb; + *res_ptr++ = s2_limb; + if( s2_limb > x ) { + while( --s1_size ) { + x = *s1_ptr++; + *res_ptr++ = x - 1; + if( x ) + goto leave; + } + return 1; + } + + leave: + if( res_ptr != s1_ptr ) { + mpi_size_t i; + for( i=0; i < s1_size-1; i++ ) + res_ptr[i] = s1_ptr[i]; + } + return 0; +} + + + +extern __inline__ mpi_limb_t +mpihelp_sub( mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr, mpi_size_t s1_size, + mpi_ptr_t s2_ptr, mpi_size_t s2_size) +{ + mpi_limb_t cy = 0; + + if( s2_size ) + cy = mpihelp_sub_n(res_ptr, s1_ptr, s2_ptr, s2_size); + + if( s1_size - s2_size ) + cy = mpihelp_sub_1(res_ptr + s2_size, s1_ptr + s2_size, + s1_size - s2_size, cy); + return cy; +} + + + +#endif /*G10_MPI_INLINE_H*/ -- cgit v1.2.1