Head

GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	lib/libcrypto/bn/bn_shift.c	Lines:	84	91	92.3 %
Date:	2017-11-07	Branches:	54	62	87.1 %


/* $OpenBSD: bn_shift.c,v 1.13 2014/10/28 07:35:58 jsg Exp $ */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young (eay@cryptsoft.com).
 * The implementation was written so as to conform with Netscapes SSL.
 *
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
 *
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young (eay@cryptsoft.com)"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
 *
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */

#include <stdio.h>
#include <string.h>

#include "bn_lcl.h"

int
BN_lshift1(BIGNUM *r, const BIGNUM *a)
{
	BN_ULONG *ap, *rp, t, c;
	int i;

	bn_check_top(r);
	bn_check_top(a);

	if (r != a) {
		r->neg = a->neg;
		if (bn_wexpand(r, a->top + 1) == NULL)
			return (0);
		r->top = a->top;
	} else {
		if (bn_wexpand(r, a->top + 1) == NULL)
			return (0);
	}
	ap = a->d;
	rp = r->d;
	c = 0;
	for (i = 0; i < a->top; i++) {
		t= *(ap++);
		*(rp++) = ((t << 1) | c) & BN_MASK2;
		c = (t & BN_TBIT) ? 1 : 0;
	}
	if (c) {
		*rp = 1;
		r->top++;
	}
	bn_check_top(r);
	return (1);
}

int
BN_rshift1(BIGNUM *r, const BIGNUM *a)
{
	BN_ULONG *ap, *rp, t, c;
	int i, j;

	bn_check_top(r);
	bn_check_top(a);

	if (BN_is_zero(a)) {
		BN_zero(r);
		return (1);
	}
	i = a->top;
	ap = a->d;
	j = i - (ap[i - 1]==1);
	if (a != r) {
		if (bn_wexpand(r, j) == NULL)
			return (0);
		r->neg = a->neg;
	}
	rp = r->d;
	t = ap[--i];
	c = (t & 1) ? BN_TBIT : 0;
	if (t >>= 1)
		rp[i] = t;
	while (i > 0) {
		t = ap[--i];
		rp[i] = ((t >> 1) & BN_MASK2) | c;
		c = (t & 1) ? BN_TBIT : 0;
	}
	r->top = j;
	bn_check_top(r);
	return (1);
}

int
BN_lshift(BIGNUM *r, const BIGNUM *a, int n)
{
	int i, nw, lb, rb;
	BN_ULONG *t, *f;
	BN_ULONG l;

	bn_check_top(r);
	bn_check_top(a);

	r->neg = a->neg;
	nw = n / BN_BITS2;
	if (bn_wexpand(r, a->top + nw + 1) == NULL)
		return (0);
	lb = n % BN_BITS2;
	rb = BN_BITS2 - lb;
	f = a->d;
	t = r->d;
	t[a->top + nw] = 0;
	if (lb == 0)
		for (i = a->top - 1; i >= 0; i--)
			t[nw + i] = f[i];
	else
		for (i = a->top - 1; i >= 0; i--) {
			l = f[i];
			t[nw + i + 1] |= (l >> rb) & BN_MASK2;
			t[nw + i] = (l << lb) & BN_MASK2;
		}
	memset(t, 0, nw * sizeof(t[0]));
/*	for (i=0; i<nw; i++)
		t[i]=0;*/
	r->top = a->top + nw + 1;
	bn_correct_top(r);
	bn_check_top(r);
	return (1);
}

int
BN_rshift(BIGNUM *r, const BIGNUM *a, int n)
{
	int i, j, nw, lb, rb;
	BN_ULONG *t, *f;
	BN_ULONG l, tmp;

	bn_check_top(r);
	bn_check_top(a);

	nw = n / BN_BITS2;
	rb = n % BN_BITS2;
	lb = BN_BITS2 - rb;
	if (nw >= a->top || a->top == 0) {
		BN_zero(r);
		return (1);
	}
	i = (BN_num_bits(a) - n + (BN_BITS2 - 1)) / BN_BITS2;
	if (r != a) {
		r->neg = a->neg;
		if (bn_wexpand(r, i) == NULL)
			return (0);
	} else {
		if (n == 0)
			return 1; /* or the copying loop will go berserk */
	}

	f = &(a->d[nw]);
	t = r->d;
	j = a->top - nw;
	r->top = i;

	if (rb == 0) {
		for (i = j; i != 0; i--)
			*(t++) = *(f++);
	} else {
		l = *(f++);
		for (i = j - 1; i != 0; i--) {
			tmp = (l >> rb) & BN_MASK2;
			l = *(f++);
			*(t++) = (tmp|(l << lb)) & BN_MASK2;
		}
		if ((l = (l >> rb) & BN_MASK2))
			*(t) = l;
	}
	bn_check_top(r);
	return (1);
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: bn_shift.c,v 1.13 2014/10/28 07:35:58 jsg Exp $ */
2			/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3			* All rights reserved.
4			*
5			* This package is an SSL implementation written
6			* by Eric Young (eay@cryptsoft.com).
7			* The implementation was written so as to conform with Netscapes SSL.
8			*
9			* This library is free for commercial and non-commercial use as long as
10			* the following conditions are aheared to. The following conditions
11			* apply to all code found in this distribution, be it the RC4, RSA,
12			* lhash, DES, etc., code; not just the SSL code. The SSL documentation
13			* included with this distribution is covered by the same copyright terms
14			* except that the holder is Tim Hudson (tjh@cryptsoft.com).
15			*
16			* Copyright remains Eric Young's, and as such any Copyright notices in
17			* the code are not to be removed.
18			* If this package is used in a product, Eric Young should be given attribution
19			* as the author of the parts of the library used.
20			* This can be in the form of a textual message at program startup or
21			* in documentation (online or textual) provided with the package.
22			*
23			* Redistribution and use in source and binary forms, with or without
24			* modification, are permitted provided that the following conditions
25			* are met:
26			* 1. Redistributions of source code must retain the copyright
27			* notice, this list of conditions and the following disclaimer.
28			* 2. Redistributions in binary form must reproduce the above copyright
29			* notice, this list of conditions and the following disclaimer in the
30			* documentation and/or other materials provided with the distribution.
31			* 3. All advertising materials mentioning features or use of this software
32			* must display the following acknowledgement:
33			* "This product includes cryptographic software written by
34			* Eric Young (eay@cryptsoft.com)"
35			* The word 'cryptographic' can be left out if the rouines from the library
36			* being used are not cryptographic related :-).
37			* 4. If you include any Windows specific code (or a derivative thereof) from
38			* the apps directory (application code) you must include an acknowledgement:
39			* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40			*
41			* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42			* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43			* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44			* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45			* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46			* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47			* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48			* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49			* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50			* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51			* SUCH DAMAGE.
52			*
53			* The licence and distribution terms for any publically available version or
54			* derivative of this code cannot be changed. i.e. this code cannot simply be
55			* copied and put under another distribution licence
56			* [including the GNU Public Licence.]
57			*/
58
59			#include <stdio.h>
60			#include <string.h>
61
62			#include "bn_lcl.h"
63
64			int
65			BN_lshift1(BIGNUM r, const BIGNUM a)
66			{
67			BN_ULONG ap, rp, t, c;
68			int i;
69
70			bn_check_top(r);
71			bn_check_top(a);
72
73	✓✓	16646996	if (r != a) {
74		5085612	r->neg = a->neg;
75	✓✓✗✓	10186617	if (bn_wexpand(r, a->top + 1) == NULL)
76			return (0);
77		5085612	r->top = a->top;
78		5085612	} else {
79	✓✓✗✓	6479221	if (bn_wexpand(r, a->top + 1) == NULL)
80			return (0);
81			}
82		8323498	ap = a->d;
83		8323498	rp = r->d;
84			c = 0;
85	✓✓	96396538	for (i = 0; i < a->top; i++) {
86		39874771	t= *(ap++);
87		39874771	*(rp++) = ((t << 1) \| c) & BN_MASK2;
88		39874771	c = (t & BN_TBIT) ? 1 : 0;
89			}
90	✓✓	8323498	if (c) {
91		4019160	*rp = 1;
92		4019160	r->top++;
93		4019160	}
94			bn_check_top(r);
95		8323498	return (1);
96		8323498	}
97
98			int
99			BN_rshift1(BIGNUM r, const BIGNUM a)
100			{
101			BN_ULONG ap, rp, t, c;
102			int i, j;
103
104			bn_check_top(r);
105			bn_check_top(a);
106
107	✗✓	923386	if (BN_is_zero(a)) {
108			BN_zero(r);
109			return (1);
110			}
111			i = a->top;
112		461693	ap = a->d;
113		461693	j = i - (ap[i - 1]==1);
114	✓✓	461693	if (a != r) {
115	✓✓✗✓	909310	if (bn_wexpand(r, j) == NULL)
116			return (0);
117		436813	r->neg = a->neg;
118		436813	}
119		461693	rp = r->d;
120		461693	t = ap[--i];
121		461693	c = (t & 1) ? BN_TBIT : 0;
122	✓✓	461693	if (t >>= 1)
123		345748	rp[i] = t;
124	✓✓	4342473	while (i > 0) {
125		1940390	t = ap[--i];
126		1940390	rp[i] = ((t >> 1) & BN_MASK2) \| c;
127		1940390	c = (t & 1) ? BN_TBIT : 0;
128			}
129		461693	r->top = j;
130			bn_check_top(r);
131		461693	return (1);
132		461693	}
133
134			int
135			BN_lshift(BIGNUM r, const BIGNUM a, int n)
136			{
137			int i, nw, lb, rb;
138			BN_ULONG t, f;
139			BN_ULONG l;
140
141			bn_check_top(r);
142			bn_check_top(a);
143
144		29257614	r->neg = a->neg;
145		14628807	nw = n / BN_BITS2;
146	✓✓✗✓	29500749	if (bn_wexpand(r, a->top + nw + 1) == NULL)
147			return (0);
148		14628807	lb = n % BN_BITS2;
149		14628807	rb = BN_BITS2 - lb;
150		14628807	f = a->d;
151		14628807	t = r->d;
152		14628807	t[a->top + nw] = 0;
153	✓✓	14628807	if (lb == 0)
154	✓✓	33759644	for (i = a->top - 1; i >= 0; i--)
155		16477547	t[nw + i] = f[i];
156			else
157	✓✓	182072117	for (i = a->top - 1; i >= 0; i--) {
158		84123930	l = f[i];
159		84123930	t[nw + i + 1] \|= (l >> rb) & BN_MASK2;
160		84123930	t[nw + i] = (l << lb) & BN_MASK2;
161			}
162		14628807	memset(t, 0, nw * sizeof(t[0]));
163			/* for (i=0; i<nw; i++)
164			t[i]=0;*/
165		14628807	r->top = a->top + nw + 1;
166	✓✗✓✓ ✓✓	105253030	bn_correct_top(r);
167			bn_check_top(r);
168		14628807	return (1);
169		14628807	}
170
171			int
172			BN_rshift(BIGNUM r, const BIGNUM a, int n)
173			{
174			int i, j, nw, lb, rb;
175			BN_ULONG t, f;
176			BN_ULONG l, tmp;
177
178			bn_check_top(r);
179			bn_check_top(a);
180
181		14812750	nw = n / BN_BITS2;
182		7406375	rb = n % BN_BITS2;
183		7406375	lb = BN_BITS2 - rb;
184	✓✓✗✓	14726253	if (nw >= a->top \|\| a->top == 0) {
185		86497	BN_zero(r);
186		86497	return (1);
187			}
188		7319878	i = (BN_num_bits(a) - n + (BN_BITS2 - 1)) / BN_BITS2;
189	✓✓	7319878	if (r != a) {
190		7199246	r->neg = a->neg;
191	✓✓✗✓	14443501	if (bn_wexpand(r, i) == NULL)
192			return (0);
193			} else {
194	✓✓	120632	if (n == 0)
195		51750	return 1; /* or the copying loop will go berserk */
196			}
197
198		7268128	f = &(a->d[nw]);
199		7268128	t = r->d;
200		7268128	j = a->top - nw;
201		7268128	r->top = i;
202
203	✓✓	7268128	if (rb == 0) {
204	✓✓	24671762	for (i = j; i != 0; i--)
205		11256564	(t++) = (f++);
206			} else {
207		6188811	l = *(f++);
208	✓✓	75637998	for (i = j - 1; i != 0; i--) {
209			tmp = (l >> rb) & BN_MASK2;
210		31630188	l = *(f++);
211		31630188	*(t++) = (tmp\|(l << lb)) & BN_MASK2;
212			}
213	✓✓	6188811	if ((l = (l >> rb) & BN_MASK2))
214		5631642	*(t) = l;
215			}
216			bn_check_top(r);
217		7268128	return (1);
218		7406375	}