Initial revision

1 files changed, 236 insertions, 0 deletions

diff --git a/pwmanager/libcrypt/mpi/mpi-add.c b/pwmanager/libcrypt/mpi/mpi-add.c
new file mode 100644
index 0000000..ada257a
--- a/dev/null
+++ b/pwmanager/libcrypt/mpi/mpi-add.c
@@ -0,0 +1,236 @@
+/* mpi-add.c  -  MPI functions
+ * Copyright (C) 1994, 1996, 1998, 2001, 2002, 2003 Free Software Foundation, Inc.
+ *
+ * This file is part of Libgcrypt.
+ *
+ * Libgcrypt is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * Libgcrypt 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser 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.
+ */
+
+#include <config.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "mpi-internal.h"
+
+
+/****************
+ * Add the unsigned integer V to the mpi-integer U and store the
+ * result in W. U and V may be the same.
+ */
+void
+gcry_mpi_add_ui(gcry_mpi_t w, gcry_mpi_t u, unsigned long v )
+{
+    mpi_ptr_t wp, up;
+    mpi_size_t usize, wsize;
+    int usign, wsign;
+
+    usize = u->nlimbs;
+    usign = u->sign;
+    wsign = 0;
+
+    /* If not space for W (and possible carry), increase space.  */
+    wsize = usize + 1;
+    if( w->alloced < wsize )
+	mpi_resize(w, wsize);
+
+    /* These must be after realloc (U may be the same as W).  */
+    up = u->d;
+    wp = w->d;
+
+    if( !usize ) {  /* simple */
+	wp[0] = v;
+	wsize = v? 1:0;
+    }
+    else if( !usign ) {  /* mpi is not negative */
+	mpi_limb_t cy;
+	cy = _gcry_mpih_add_1(wp, up, usize, v);
+	wp[usize] = cy;
+	wsize = usize + cy;
+    }
+    else {  /* The signs are different.  Need exact comparison to determine
+	     * which operand to subtract from which.  */
+	if( usize == 1 && up[0] < v ) {
+	    wp[0] = v - up[0];
+	    wsize = 1;
+	}
+	else {
+	    _gcry_mpih_sub_1(wp, up, usize, v);
+	    /* Size can decrease with at most one limb. */
+	    wsize = usize - (wp[usize-1]==0);
+	    wsign = 1;
+	}
+    }
+
+    w->nlimbs = wsize;
+    w->sign   = wsign;
+}
+
+
+void
+gcry_mpi_add(gcry_mpi_t w, gcry_mpi_t u, gcry_mpi_t v)
+{
+    mpi_ptr_t wp, up, vp;
+    mpi_size_t usize, vsize, wsize;
+    int usign, vsign, wsign;
+
+    if( u->nlimbs < v->nlimbs ) { /* Swap U and V. */
+	usize = v->nlimbs;
+	usign = v->sign;
+	vsize = u->nlimbs;
+	vsign = u->sign;
+	wsize = usize + 1;
+	RESIZE_IF_NEEDED(w, wsize);
+	/* These must be after realloc (u or v may be the same as w).  */
+	up    = v->d;
+	vp    = u->d;
+    }
+    else {
+	usize = u->nlimbs;
+	usign = u->sign;
+	vsize = v->nlimbs;
+	vsign = v->sign;
+	wsize = usize + 1;
+	RESIZE_IF_NEEDED(w, wsize);
+	/* These must be after realloc (u or v may be the same as w).  */
+	up    = u->d;
+	vp    = v->d;
+    }
+    wp = w->d;
+    wsign = 0;
+
+    if( !vsize ) {  /* simple */
+	MPN_COPY(wp, up, usize );
+	wsize = usize;
+	wsign = usign;
+    }
+    else if( usign != vsign ) { /* different sign */
+	/* This test is right since USIZE >= VSIZE */
+	if( usize != vsize ) {
+	    _gcry_mpih_sub(wp, up, usize, vp, vsize);
+	    wsize = usize;
+	    MPN_NORMALIZE(wp, wsize);
+	    wsign = usign;
+	}
+	else if( _gcry_mpih_cmp(up, vp, usize) < 0 ) {
+	    _gcry_mpih_sub_n(wp, vp, up, usize);
+	    wsize = usize;
+	    MPN_NORMALIZE(wp, wsize);
+	    if( !usign )
+		wsign = 1;
+	}
+	else {
+	    _gcry_mpih_sub_n(wp, up, vp, usize);
+	    wsize = usize;
+	    MPN_NORMALIZE(wp, wsize);
+	    if( usign )
+		wsign = 1;
+	}
+    }
+    else { /* U and V have same sign. Add them. */
+	mpi_limb_t cy = _gcry_mpih_add(wp, up, usize, vp, vsize);
+	wp[usize] = cy;
+	wsize = usize + cy;
+	if( usign )
+	    wsign = 1;
+    }
+
+    w->nlimbs = wsize;
+    w->sign = wsign;
+}
+
+
+/****************
+ * Subtract the unsigned integer V from the mpi-integer U and store the
+ * result in W.
+ */
+void
+gcry_mpi_sub_ui(gcry_mpi_t w, gcry_mpi_t u, unsigned long v )
+{
+    mpi_ptr_t wp, up;
+    mpi_size_t usize, wsize;
+    int usign, wsign;
+
+    usize = u->nlimbs;
+    usign = u->sign;
+    wsign = 0;
+
+    /* If not space for W (and possible carry), increase space.  */
+    wsize = usize + 1;
+    if( w->alloced < wsize )
+	mpi_resize(w, wsize);
+
+    /* These must be after realloc (U may be the same as W).  */
+    up = u->d;
+    wp = w->d;
+
+    if( !usize ) {  /* simple */
+	wp[0] = v;
+	wsize = v? 1:0;
+	wsign = 1;
+    }
+    else if( usign ) {	/* mpi and v are negative */
+	mpi_limb_t cy;
+	cy = _gcry_mpih_add_1(wp, up, usize, v);
+	wp[usize] = cy;
+	wsize = usize + cy;
+    }
+    else {  /* The signs are different.  Need exact comparison to determine
+	     * which operand to subtract from which.  */
+	if( usize == 1 && up[0] < v ) {
+	    wp[0] = v - up[0];
+	    wsize = 1;
+	    wsign = 1;
+	}
+	else {
+	    _gcry_mpih_sub_1(wp, up, usize, v);
+	    /* Size can decrease with at most one limb. */
+	    wsize = usize - (wp[usize-1]==0);
+	}
+    }
+
+    w->nlimbs = wsize;
+    w->sign   = wsign;
+}
+
+void
+gcry_mpi_sub(gcry_mpi_t w, gcry_mpi_t u, gcry_mpi_t v)
+{
+  gcry_mpi_t vv = mpi_copy (v);
+  vv->sign = ! vv->sign;
+  gcry_mpi_add (w, u, vv);
+  mpi_free (vv);
+}
+
+
+void
+gcry_mpi_addm( gcry_mpi_t w, gcry_mpi_t u, gcry_mpi_t v, gcry_mpi_t m)
+{
+    gcry_mpi_add(w, u, v);
+    _gcry_mpi_fdiv_r( w, w, m );
+}
+
+void
+gcry_mpi_subm( gcry_mpi_t w, gcry_mpi_t u, gcry_mpi_t v, gcry_mpi_t m)
+{
+    gcry_mpi_sub(w, u, v);
+    _gcry_mpi_fdiv_r( w, w, m );
+}
+