summaryrefslogtreecommitdiff
path: root/lib/mpi/mpi-add.c
blob: 9056fc5167fc84c67f9dbe236ae88ac92278294a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
/* mpi-add.c  -  MPI functions
 * Copyright (C) 1994, 1996, 1998, 2001, 2002,
 *               2003 Free Software Foundation, Inc.
 *
 * This file is part of Libgcrypt.
 *
 * 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 "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 mpi_add_ui(MPI w, MPI 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 = mpihelp_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 {
			mpihelp_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 mpi_add(MPI w, MPI u, MPI 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) {
			mpihelp_sub(wp, up, usize, vp, vsize);
			wsize = usize;
			MPN_NORMALIZE(wp, wsize);
			wsign = usign;
		} else if (mpihelp_cmp(up, vp, usize) < 0) {
			mpihelp_sub_n(wp, vp, up, usize);
			wsize = usize;
			MPN_NORMALIZE(wp, wsize);
			if (!usign)
				wsign = 1;
		} else {
			mpihelp_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 = mpihelp_add(wp, up, usize, vp, vsize);
		wp[usize] = cy;
		wsize = usize + cy;
		if (usign)
			wsign = 1;
	}

	w->nlimbs = wsize;
	w->sign = wsign;
}
EXPORT_SYMBOL_GPL(mpi_add);

void mpi_sub(MPI w, MPI u, MPI v)
{
	MPI vv = mpi_copy(v);
	vv->sign = !vv->sign;
	mpi_add(w, u, vv);
	mpi_free(vv);
}
EXPORT_SYMBOL_GPL(mpi_sub);

void mpi_addm(MPI w, MPI u, MPI v, MPI m)
{
	mpi_add(w, u, v);
	mpi_mod(w, w, m);
}
EXPORT_SYMBOL_GPL(mpi_addm);

void mpi_subm(MPI w, MPI u, MPI v, MPI m)
{
	mpi_sub(w, u, v);
	mpi_mod(w, w, m);
}
EXPORT_SYMBOL_GPL(mpi_subm);