Head

GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	lib/libcrypto/crypto/../../libssl/src/crypto/modes/cfb128.c	Lines:	30	65	46.2 %
Date:	2016-12-06	Branches:	14	40	35.0 %


/* $OpenBSD: cfb128.c,v 1.4 2015/02/10 09:46:30 miod Exp $ */
/* ====================================================================
 * Copyright (c) 2008 The OpenSSL Project.  All rights reserved.
 *
 * 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 above 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 acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    openssl-core@openssl.org.
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED 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 OpenSSL PROJECT OR
 * ITS 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.
 * ====================================================================
 *
 */

#include <openssl/crypto.h>
#include "modes_lcl.h"
#include <string.h>

#ifndef MODES_DEBUG
# ifndef NDEBUG
#  define NDEBUG
# endif
#endif

/* The input and output encrypted as though 128bit cfb mode is being
 * used.  The extra state information to record how much of the
 * 128bit block we have used is contained in *num;
 */
void CRYPTO_cfb128_encrypt(const unsigned char *in, unsigned char *out,
			size_t len, const void *key,
			unsigned char ivec[16], int *num,
			int enc, block128_f block)
{
    unsigned int n;
    size_t l = 0;

    n = *num;

    if (enc) {
#if !defined(OPENSSL_SMALL_FOOTPRINT)
	if (16%sizeof(size_t) == 0) do {	/* always true actually */
		while (n && len) {
			*(out++) = ivec[n] ^= *(in++);
			--len;
			n = (n+1) % 16;
		}
#ifdef __STRICT_ALIGNMENT
		if (((size_t)in|(size_t)out|(size_t)ivec)%sizeof(size_t) != 0)
			break;
#endif
		while (len>=16) {
			(*block)(ivec, ivec, key);
			for (; n<16; n+=sizeof(size_t)) {
				*(size_t*)(out+n) =
				*(size_t*)(ivec+n) ^= *(size_t*)(in+n);
			}
			len -= 16;
			out += 16;
			in  += 16;
			n = 0;
		}
		if (len) {
			(*block)(ivec, ivec, key);
			while (len--) {
				out[n] = ivec[n] ^= in[n];
				++n;
			}
		}
		*num = n;
		return;
	} while (0);
	/* the rest would be commonly eliminated by x86* compiler */
#endif
	while (l<len) {
		if (n == 0) {
			(*block)(ivec, ivec, key);
		}
		out[l] = ivec[n] ^= in[l];
		++l;
		n = (n+1) % 16;
	}
	*num = n;
    } else {
#if !defined(OPENSSL_SMALL_FOOTPRINT)
	if (16%sizeof(size_t) == 0) do {	/* always true actually */
		while (n && len) {
			unsigned char c;
			*(out++) = ivec[n] ^ (c = *(in++)); ivec[n] = c;
			--len;
			n = (n+1) % 16;
 		}
#ifdef __STRICT_ALIGNMENT
		if (((size_t)in|(size_t)out|(size_t)ivec)%sizeof(size_t) != 0)
			break;
#endif
		while (len>=16) {
			(*block)(ivec, ivec, key);
			for (; n<16; n+=sizeof(size_t)) {
				size_t t = *(size_t*)(in+n);
				*(size_t*)(out+n) = *(size_t*)(ivec+n) ^ t;
				*(size_t*)(ivec+n) = t;
			}
			len -= 16;
			out += 16;
			in  += 16;
			n = 0;
		}
		if (len) {
			(*block)(ivec, ivec, key);
			while (len--) {
				unsigned char c;
				out[n] = ivec[n] ^ (c = in[n]); ivec[n] = c;
				++n;
			}
 		}
		*num = n;
		return;
	} while (0);
	/* the rest would be commonly eliminated by x86* compiler */
#endif
	while (l<len) {
		unsigned char c;
		if (n == 0) {
			(*block)(ivec, ivec, key);
		}
		out[l] = ivec[n] ^ (c = in[l]); ivec[n] = c;
		++l;
		n = (n+1) % 16;
	}
	*num=n;
    }
}

/* This expects a single block of size nbits for both in and out. Note that
   it corrupts any extra bits in the last byte of out */
static void cfbr_encrypt_block(const unsigned char *in,unsigned char *out,
			    int nbits,const void *key,
			    unsigned char ivec[16],int enc,
			    block128_f block)
{
    int n,rem,num;
    unsigned char ovec[16*2 + 1];  /* +1 because we dererefence (but don't use) one byte off the end */

    if (nbits<=0 || nbits>128) return;

	/* fill in the first half of the new IV with the current IV */
	memcpy(ovec,ivec,16);
	/* construct the new IV */
	(*block)(ivec,ivec,key);
	num = (nbits+7)/8;
	if (enc)	/* encrypt the input */
	    for(n=0 ; n < num ; ++n)
		out[n] = (ovec[16+n] = in[n] ^ ivec[n]);
	else		/* decrypt the input */
	    for(n=0 ; n < num ; ++n)
		out[n] = (ovec[16+n] = in[n]) ^ ivec[n];
	/* shift ovec left... */
	rem = nbits%8;
	num = nbits/8;
	if(rem==0)
	    memcpy(ivec,ovec+num,16);
	else
	    for(n=0 ; n < 16 ; ++n)
		ivec[n] = ovec[n+num]<<rem | ovec[n+num+1]>>(8-rem);

    /* it is not necessary to cleanse ovec, since the IV is not secret */
}

/* N.B. This expects the input to be packed, MS bit first */
void CRYPTO_cfb128_1_encrypt(const unsigned char *in, unsigned char *out,
		 	size_t bits, const void *key,
			unsigned char ivec[16], int *num,
			int enc, block128_f block)
{
    size_t n;
    unsigned char c[1],d[1];

    for(n=0 ; n<bits ; ++n)
	{
	c[0]=(in[n/8]&(1 << (7-n%8))) ? 0x80 : 0;
	cfbr_encrypt_block(c,d,1,key,ivec,enc,block);
	out[n/8]=(out[n/8]&~(1 << (unsigned int)(7-n%8))) |
		 ((d[0]&0x80) >> (unsigned int)(n%8));
	}
}

void CRYPTO_cfb128_8_encrypt(const unsigned char *in, unsigned char *out,
			size_t length, const void *key,
			unsigned char ivec[16], int *num,
			int enc, block128_f block)
{
    size_t n;

    for(n=0 ; n<length ; ++n)
	cfbr_encrypt_block(&in[n],&out[n],8,key,ivec,enc,block);
}



Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: cfb128.c,v 1.4 2015/02/10 09:46:30 miod Exp $ */
2			/* ====================================================================
3			* Copyright (c) 2008 The OpenSSL Project. All rights reserved.
4			*
5			* Redistribution and use in source and binary forms, with or without
6			* modification, are permitted provided that the following conditions
7			* are met:
8			*
9			* 1. Redistributions of source code must retain the above copyright
10			* notice, this list of conditions and the following disclaimer.
11			*
12			* 2. Redistributions in binary form must reproduce the above copyright
13			* notice, this list of conditions and the following disclaimer in
14			* the documentation and/or other materials provided with the
15			* distribution.
16			*
17			* 3. All advertising materials mentioning features or use of this
18			* software must display the following acknowledgment:
19			* "This product includes software developed by the OpenSSL Project
20			* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
21			*
22			* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
23			* endorse or promote products derived from this software without
24			* prior written permission. For written permission, please contact
25			* openssl-core@openssl.org.
26			*
27			* 5. Products derived from this software may not be called "OpenSSL"
28			* nor may "OpenSSL" appear in their names without prior written
29			* permission of the OpenSSL Project.
30			*
31			* 6. Redistributions of any form whatsoever must retain the following
32			* acknowledgment:
33			* "This product includes software developed by the OpenSSL Project
34			* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
35			*
36			* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
37			* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
38			* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
39			* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
40			* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
41			* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
42			* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
43			* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
44			* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
45			* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
46			* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
47			* OF THE POSSIBILITY OF SUCH DAMAGE.
48			* ====================================================================
49			*
50			*/
51
52			#include <openssl/crypto.h>
53			#include "modes_lcl.h"
54			#include <string.h>
55
56			#ifndef MODES_DEBUG
57			# ifndef NDEBUG
58			# define NDEBUG
59			# endif
60			#endif
61
62			/* The input and output encrypted as though 128bit cfb mode is being
63			* used. The extra state information to record how much of the
64			* 128bit block we have used is contained in *num;
65			*/
66			void CRYPTO_cfb128_encrypt(const unsigned char in, unsigned char out,
67			size_t len, const void *key,
68			unsigned char ivec[16], int *num,
69			int enc, block128_f block)
70		48	{
71			unsigned int n;
72		48	size_t l = 0;
73
74		48	n = *num;
75
76	✓✓	48	if (enc) {
77			#if !defined(OPENSSL_SMALL_FOOTPRINT)
78			if (16%sizeof(size_t) == 0) do { /* always true actually */
79	✗✓	24	while (n && len) {
80			(out++) = ivec[n] ^= (in++);
81			--len;
82			n = (n+1) % 16;
83			}
84			#ifdef __STRICT_ALIGNMENT
85			if (((size_t)in\|(size_t)out\|(size_t)ivec)%sizeof(size_t) != 0)
86			break;
87			#endif
88	✓✓	48	while (len>=16) {
89		24	(*block)(ivec, ivec, key);
90	✓✓	72	for (; n<16; n+=sizeof(size_t)) {
91		48	(size_t)(out+n) =
92			(size_t)(ivec+n) ^= (size_t)(in+n);
93			}
94		24	len -= 16;
95		24	out += 16;
96		24	in += 16;
97		24	n = 0;
98			}
99	✗✓	24	if (len) {
100			(*block)(ivec, ivec, key);
101			while (len--) {
102			out[n] = ivec[n] ^= in[n];
103			++n;
104			}
105			}
106		24	*num = n;
107		24	return;
108			} while (0);
109			/* the rest would be commonly eliminated by x86* compiler */
110			#endif
111			while (l<len) {
112			if (n == 0) {
113			(*block)(ivec, ivec, key);
114			}
115			out[l] = ivec[n] ^= in[l];
116			++l;
117			n = (n+1) % 16;
118			}
119			*num = n;
120			} else {
121			#if !defined(OPENSSL_SMALL_FOOTPRINT)
122			if (16%sizeof(size_t) == 0) do { /* always true actually */
123	✗✓	24	while (n && len) {
124			unsigned char c;
125			(out++) = ivec[n] ^ (c = (in++)); ivec[n] = c;
126			--len;
127			n = (n+1) % 16;
128			}
129			#ifdef __STRICT_ALIGNMENT
130			if (((size_t)in\|(size_t)out\|(size_t)ivec)%sizeof(size_t) != 0)
131			break;
132			#endif
133	✓✓	48	while (len>=16) {
134		24	(*block)(ivec, ivec, key);
135	✓✓	72	for (; n<16; n+=sizeof(size_t)) {
136		48	size_t t = (size_t)(in+n);
137		48	(size_t)(out+n) = (size_t)(ivec+n) ^ t;
138		48	(size_t)(ivec+n) = t;
139			}
140		24	len -= 16;
141		24	out += 16;
142		24	in += 16;
143		24	n = 0;
144			}
145	✗✓	24	if (len) {
146			(*block)(ivec, ivec, key);
147			while (len--) {
148			unsigned char c;
149			out[n] = ivec[n] ^ (c = in[n]); ivec[n] = c;
150			++n;
151			}
152			}
153		24	*num = n;
154		24	return;
155			} while (0);
156			/* the rest would be commonly eliminated by x86* compiler */
157			#endif
158			while (l<len) {
159			unsigned char c;
160			if (n == 0) {
161			(*block)(ivec, ivec, key);
162			}
163			out[l] = ivec[n] ^ (c = in[l]); ivec[n] = c;
164			++l;
165			n = (n+1) % 16;
166			}
167			*num=n;
168			}
169			}
170
171			/* This expects a single block of size nbits for both in and out. Note that
172			it corrupts any extra bits in the last byte of out */
173			static void cfbr_encrypt_block(const unsigned char in,unsigned char out,
174			int nbits,const void *key,
175			unsigned char ivec[16],int enc,
176			block128_f block)
177			{
178			int n,rem,num;
179			unsigned char ovec[162 + 1]; / +1 because we dererefence (but don't use) one byte off the end */
180
181			if (nbits<=0 \|\| nbits>128) return;
182
183			/* fill in the first half of the new IV with the current IV */
184			memcpy(ovec,ivec,16);
185			/* construct the new IV */
186			(*block)(ivec,ivec,key);
187			num = (nbits+7)/8;
188			if (enc) /* encrypt the input */
189			for(n=0 ; n < num ; ++n)
190			out[n] = (ovec[16+n] = in[n] ^ ivec[n]);
191			else /* decrypt the input */
192			for(n=0 ; n < num ; ++n)
193			out[n] = (ovec[16+n] = in[n]) ^ ivec[n];
194			/* shift ovec left... */
195			rem = nbits%8;
196			num = nbits/8;
197			if(rem==0)
198			memcpy(ivec,ovec+num,16);
199			else
200			for(n=0 ; n < 16 ; ++n)
201			ivec[n] = ovec[n+num]<<rem \| ovec[n+num+1]>>(8-rem);
202
203			/* it is not necessary to cleanse ovec, since the IV is not secret */
204			}
205
206			/* N.B. This expects the input to be packed, MS bit first */
207			void CRYPTO_cfb128_1_encrypt(const unsigned char in, unsigned char out,
208			size_t bits, const void *key,
209			unsigned char ivec[16], int *num,
210			int enc, block128_f block)
211			{
212			size_t n;
213			unsigned char c[1],d[1];
214
215			for(n=0 ; n<bits ; ++n)
216			{
217			c[0]=(in[n/8]&(1 << (7-n%8))) ? 0x80 : 0;
218			cfbr_encrypt_block(c,d,1,key,ivec,enc,block);
219			out[n/8]=(out[n/8]&~(1 << (unsigned int)(7-n%8))) \|
220			((d[0]&0x80) >> (unsigned int)(n%8));
221			}
222			}
223
224			void CRYPTO_cfb128_8_encrypt(const unsigned char in, unsigned char out,
225			size_t length, const void *key,
226			unsigned char ivec[16], int *num,
227			int enc, block128_f block)
228			{
229			size_t n;
230
231			for(n=0 ; n<length ; ++n)
232			cfbr_encrypt_block(&in[n],&out[n],8,key,ivec,enc,block);
233			}
234