Head

GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	lib/libcrypto/des/cfb_enc.c	Lines:	51	57	89.5 %
Date:	2017-11-07	Branches:	53	60	88.3 %


/* $OpenBSD: cfb_enc.c,v 1.13 2015/02/10 09:46:30 miod 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 "des_locl.h"
#include <machine/endian.h>

/* The input and output are loaded in multiples of 8 bits.
 * What this means is that if you hame numbits=12 and length=2
 * the first 12 bits will be retrieved from the first byte and half
 * the second.  The second 12 bits will come from the 3rd and half the 4th
 * byte.
 */
/* Until Aug 1 2003 this function did not correctly implement CFB-r, so it
 * will not be compatible with any encryption prior to that date. Ben. */
void DES_cfb_encrypt(const unsigned char *in, unsigned char *out, int numbits,
		     long length, DES_key_schedule *schedule, DES_cblock *ivec,
		     int enc)
	{
	DES_LONG d0,d1,v0,v1;
	unsigned long l=length;
	int num=numbits/8,n=(numbits+7)/8,i,rem=numbits%8;
	DES_LONG ti[2];
	unsigned char *iv;
#if BYTE_ORDER != LITTLE_ENDIAN
	unsigned char ovec[16];
#else
	unsigned int  sh[4];
	unsigned char *ovec=(unsigned char *)sh;
#endif

	if (numbits<=0 || numbits > 64) return;
	iv = &(*ivec)[0];
	c2l(iv,v0);
	c2l(iv,v1);
	if (enc)
		{
		while (l >= (unsigned long)n)
			{
			l-=n;
			ti[0]=v0;
			ti[1]=v1;
			DES_encrypt1((DES_LONG *)ti,schedule,DES_ENCRYPT);
			c2ln(in,d0,d1,n);
			in+=n;
			d0^=ti[0];
			d1^=ti[1];
			l2cn(d0,d1,out,n);
			out+=n;
			/* 30-08-94 - eay - changed because l>>32 and
			 * l<<32 are bad under gcc :-( */
			if (numbits == 32)
				{ v0=v1; v1=d0; }
			else if (numbits == 64)
				{ v0=d0; v1=d1; }
			else
				{
#if BYTE_ORDER != LITTLE_ENDIAN
				iv=&ovec[0];
				l2c(v0,iv);
				l2c(v1,iv);
				l2c(d0,iv);
				l2c(d1,iv);
#else
				sh[0]=v0, sh[1]=v1, sh[2]=d0, sh[3]=d1;
#endif
				if (rem==0)
					memmove(ovec,ovec+num,8);
				else
					for(i=0 ; i < 8 ; ++i)
						ovec[i]=ovec[i+num]<<rem |
							ovec[i+num+1]>>(8-rem);
#if BYTE_ORDER == LITTLE_ENDIAN
				v0=sh[0], v1=sh[1];
#else
				iv=&ovec[0];
				c2l(iv,v0);
				c2l(iv,v1);
#endif
				}
			}
		}
	else
		{
		while (l >= (unsigned long)n)
			{
			l-=n;
			ti[0]=v0;
			ti[1]=v1;
			DES_encrypt1((DES_LONG *)ti,schedule,DES_ENCRYPT);
			c2ln(in,d0,d1,n);
			in+=n;
			/* 30-08-94 - eay - changed because l>>32 and
			 * l<<32 are bad under gcc :-( */
			if (numbits == 32)
				{ v0=v1; v1=d0; }
			else if (numbits == 64)
				{ v0=d0; v1=d1; }
			else
				{
#if BYTE_ORDER != LITTLE_ENDIAN
				iv=&ovec[0];
				l2c(v0,iv);
				l2c(v1,iv);
				l2c(d0,iv);
				l2c(d1,iv);
#else
				sh[0]=v0, sh[1]=v1, sh[2]=d0, sh[3]=d1;
#endif
				if (rem==0)
					memmove(ovec,ovec+num,8);
				else
					for(i=0 ; i < 8 ; ++i)
						ovec[i]=ovec[i+num]<<rem |
							ovec[i+num+1]>>(8-rem);
#if BYTE_ORDER == LITTLE_ENDIAN
				v0=sh[0], v1=sh[1];
#else
				iv=&ovec[0];
				c2l(iv,v0);
				c2l(iv,v1);
#endif
				}
			d0^=ti[0];
			d1^=ti[1];
			l2cn(d0,d1,out,n);
			out+=n;
			}
		}
	iv = &(*ivec)[0];
	l2c(v0,iv);
	l2c(v1,iv);
	v0=v1=d0=d1=ti[0]=ti[1]=0;
	}



Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: cfb_enc.c,v 1.13 2015/02/10 09:46:30 miod 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 "des_locl.h"
60			#include <machine/endian.h>
61
62			/* The input and output are loaded in multiples of 8 bits.
63			* What this means is that if you hame numbits=12 and length=2
64			* the first 12 bits will be retrieved from the first byte and half
65			* the second. The second 12 bits will come from the 3rd and half the 4th
66			* byte.
67			*/
68			/* Until Aug 1 2003 this function did not correctly implement CFB-r, so it
69			* will not be compatible with any encryption prior to that date. Ben. */
70			void DES_cfb_encrypt(const unsigned char in, unsigned char out, int numbits,
71			long length, DES_key_schedule schedule, DES_cblock ivec,
72			int enc)
73			{
74			DES_LONG d0,d1,v0,v1;
75			unsigned long l=length;
76		808	int num=numbits/8,n=(numbits+7)/8,i,rem=numbits%8;
77		404	DES_LONG ti[2];
78			unsigned char *iv;
79			#if BYTE_ORDER != LITTLE_ENDIAN
80			unsigned char ovec[16];
81			#else
82		404	unsigned int sh[4];
83		404	unsigned char ovec=(unsigned char )sh;
84			#endif
85
86	✗✓	404	if (numbits<=0 \|\| numbits > 64) return;
87		404	iv = &(*ivec)[0];
88		404	c2l(iv,v0);
89		404	c2l(iv,v1);
90	✓✓	404	if (enc)
91			{
92	✓✓	4064	while (l >= (unsigned long)n)
93			{
94		8142	l-=n;
95		8142	ti[0]=v0;
96		8142	ti[1]=v1;
97		8142	DES_encrypt1((DES_LONG *)ti,schedule,DES_ENCRYPT);
98	✓✓✓✓ ✓✓✓✓ ✓	12426	c2ln(in,d0,d1,n);
99		8142	in+=n;
100		8142	d0^=ti[0];
101		8142	d1^=ti[1];
102	✓✓✓✓ ✓✓✓✓ ✓	12426	l2cn(d0,d1,out,n);
103		3858	out+=n;
104			/* 30-08-94 - eay - changed because l>>32 and
105			* l<<32 are bad under gcc :-( */
106	✓✓	3858	if (numbits == 32)
107		36	{ v0=v1; v1=d0; }
108	✓✓	3822	else if (numbits == 64)
109		18	{ v0=d0; v1=d1; }
110			else
111			{
112			#if BYTE_ORDER != LITTLE_ENDIAN
113			iv=&ovec[0];
114			l2c(v0,iv);
115			l2c(v1,iv);
116			l2c(d0,iv);
117			l2c(d1,iv);
118			#else
119		3804	sh[0]=v0, sh[1]=v1, sh[2]=d0, sh[3]=d1;
120			#endif
121	✓✗	3804	if (rem==0)
122		3804	memmove(ovec,ovec+num,8);
123			else
124			for(i=0 ; i < 8 ; ++i)
125			ovec[i]=ovec[i+num]<<rem \|
126			ovec[i+num+1]>>(8-rem);
127			#if BYTE_ORDER == LITTLE_ENDIAN
128		3804	v0=sh[0], v1=sh[1];
129			#else
130			iv=&ovec[0];
131			c2l(iv,v0);
132			c2l(iv,v1);
133			#endif
134			}
135			}
136			}
137			else
138			{
139	✓✓	7914	while (l >= (unsigned long)n)
140			{
141		8142	l-=n;
142		8142	ti[0]=v0;
143		8142	ti[1]=v1;
144		8142	DES_encrypt1((DES_LONG *)ti,schedule,DES_ENCRYPT);
145	✓✓✓✓ ✓✓✓✓ ✓	12426	c2ln(in,d0,d1,n);
146		3858	in+=n;
147			/* 30-08-94 - eay - changed because l>>32 and
148			* l<<32 are bad under gcc :-( */
149	✓✓	3858	if (numbits == 32)
150		36	{ v0=v1; v1=d0; }
151	✓✓	3822	else if (numbits == 64)
152		18	{ v0=d0; v1=d1; }
153			else
154			{
155			#if BYTE_ORDER != LITTLE_ENDIAN
156			iv=&ovec[0];
157			l2c(v0,iv);
158			l2c(v1,iv);
159			l2c(d0,iv);
160			l2c(d1,iv);
161			#else
162		3804	sh[0]=v0, sh[1]=v1, sh[2]=d0, sh[3]=d1;
163			#endif
164	✓✗	3804	if (rem==0)
165		3804	memmove(ovec,ovec+num,8);
166			else
167			for(i=0 ; i < 8 ; ++i)
168			ovec[i]=ovec[i+num]<<rem \|
169			ovec[i+num+1]>>(8-rem);
170			#if BYTE_ORDER == LITTLE_ENDIAN
171		3804	v0=sh[0], v1=sh[1];
172			#else
173			iv=&ovec[0];
174			c2l(iv,v0);
175			c2l(iv,v1);
176			#endif
177			}
178		8142	d0^=ti[0];
179		8142	d1^=ti[1];
180	✓✓✓✓ ✓✓✓✓ ✓	12426	l2cn(d0,d1,out,n);
181		3858	out+=n;
182			}
183			}
184			iv = &(*ivec)[0];
185		404	l2c(v0,iv);
186		404	l2c(v1,iv);
187		404	v0=v1=d0=d1=ti[0]=ti[1]=0;
188		808	}
189