GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: lib/libcrypto/modes/ofb128.c Lines: 20 20 100.0 %
Date: 2017-11-07 Branches: 10 10 100.0 %

Line Branch Exec Source
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/* $OpenBSD: ofb128.c,v 1.4 2015/02/10 09:46:30 miod Exp $ */
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/* ====================================================================
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 * Copyright (c) 2008 The OpenSSL Project.  All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * 1. Redistributions of source code must retain the above copyright
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 *    notice, this list of conditions and the following disclaimer.
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 *
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 * 2. Redistributions in binary form must reproduce the above copyright
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 *    notice, this list of conditions and the following disclaimer in
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 *    the documentation and/or other materials provided with the
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 *    distribution.
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 *
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 * 3. All advertising materials mentioning features or use of this
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 *    software must display the following acknowledgment:
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 *    "This product includes software developed by the OpenSSL Project
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 *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
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 *
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 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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 *    endorse or promote products derived from this software without
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 *    prior written permission. For written permission, please contact
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 *    openssl-core@openssl.org.
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 *
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 * 5. Products derived from this software may not be called "OpenSSL"
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 *    nor may "OpenSSL" appear in their names without prior written
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 *    permission of the OpenSSL Project.
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 *
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 * 6. Redistributions of any form whatsoever must retain the following
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 *    acknowledgment:
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 *    "This product includes software developed by the OpenSSL Project
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 *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
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 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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 * OF THE POSSIBILITY OF SUCH DAMAGE.
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 * ====================================================================
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 *
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 */
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#include <openssl/crypto.h>
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#include "modes_lcl.h"
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#include <string.h>
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#ifndef MODES_DEBUG
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# ifndef NDEBUG
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#  define NDEBUG
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# endif
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#endif
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/* The input and output encrypted as though 128bit ofb mode is being
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 * used.  The extra state information to record how much of the
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 * 128bit block we have used is contained in *num;
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 */
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void CRYPTO_ofb128_encrypt(const unsigned char *in, unsigned char *out,
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			size_t len, const void *key,
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			unsigned char ivec[16], int *num,
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			block128_f block)
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{
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	unsigned int n;
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	size_t l=0;
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	n = *num;
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#if !defined(OPENSSL_SMALL_FOOTPRINT)
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	if (16%sizeof(size_t) == 0) do { /* always true actually */
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4008
		while (n && len) {
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			*(out++) = *(in++) ^ ivec[n];
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			--len;
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			n = (n+1) % 16;
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		}
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#ifdef __STRICT_ALIGNMENT
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		if (((size_t)in|(size_t)out|(size_t)ivec)%sizeof(size_t) != 0)
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			break;
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#endif
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		while (len>=16) {
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			(*block)(ivec, ivec, key);
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			for (; n<16; n+=sizeof(size_t))
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				*(size_t*)(out+n) =
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				*(size_t*)(in+n) ^ *(size_t*)(ivec+n);
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			len -= 16;
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			out += 16;
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			in  += 16;
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			n = 0;
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		}
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		if (len) {
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			(*block)(ivec, ivec, key);
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			while (len--) {
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				out[n] = in[n] ^ ivec[n];
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				++n;
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			}
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		}
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		*num = n;
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		return;
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	} while(0);
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	/* the rest would be commonly eliminated by x86* compiler */
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#endif
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	while (l<len) {
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		if (n==0) {
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			(*block)(ivec, ivec, key);
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		}
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		out[l] = in[l] ^ ivec[n];
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		++l;
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		n = (n+1) % 16;
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	}
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	*num=n;
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}