LCOV - code coverage report
Current view: top level - modes - ofb128.c (source / functions) Hit Total Coverage
Test: lcov_coverage_final.info Lines: 23 23 100.0 %
Date: 2014-08-02 Functions: 1 1 100.0 %
Branches: 10 10 100.0 %

           Branch data     Line data    Source code
       1                 :            : /* ====================================================================
       2                 :            :  * Copyright (c) 2008 The OpenSSL Project.  All rights reserved.
       3                 :            :  *
       4                 :            :  * Redistribution and use in source and binary forms, with or without
       5                 :            :  * modification, are permitted provided that the following conditions
       6                 :            :  * are met:
       7                 :            :  *
       8                 :            :  * 1. Redistributions of source code must retain the above copyright
       9                 :            :  *    notice, this list of conditions and the following disclaimer. 
      10                 :            :  *
      11                 :            :  * 2. Redistributions in binary form must reproduce the above copyright
      12                 :            :  *    notice, this list of conditions and the following disclaimer in
      13                 :            :  *    the documentation and/or other materials provided with the
      14                 :            :  *    distribution.
      15                 :            :  *
      16                 :            :  * 3. All advertising materials mentioning features or use of this
      17                 :            :  *    software must display the following acknowledgment:
      18                 :            :  *    "This product includes software developed by the OpenSSL Project
      19                 :            :  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
      20                 :            :  *
      21                 :            :  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
      22                 :            :  *    endorse or promote products derived from this software without
      23                 :            :  *    prior written permission. For written permission, please contact
      24                 :            :  *    openssl-core@openssl.org.
      25                 :            :  *
      26                 :            :  * 5. Products derived from this software may not be called "OpenSSL"
      27                 :            :  *    nor may "OpenSSL" appear in their names without prior written
      28                 :            :  *    permission of the OpenSSL Project.
      29                 :            :  *
      30                 :            :  * 6. Redistributions of any form whatsoever must retain the following
      31                 :            :  *    acknowledgment:
      32                 :            :  *    "This product includes software developed by the OpenSSL Project
      33                 :            :  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
      34                 :            :  *
      35                 :            :  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
      36                 :            :  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
      37                 :            :  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
      38                 :            :  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
      39                 :            :  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
      40                 :            :  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
      41                 :            :  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
      42                 :            :  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
      43                 :            :  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
      44                 :            :  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
      45                 :            :  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
      46                 :            :  * OF THE POSSIBILITY OF SUCH DAMAGE.
      47                 :            :  * ====================================================================
      48                 :            :  *
      49                 :            :  */
      50                 :            : 
      51                 :            : #include <openssl/crypto.h>
      52                 :            : #include "modes_lcl.h"
      53                 :            : #include <string.h>
      54                 :            : 
      55                 :            : #ifndef MODES_DEBUG
      56                 :            : # ifndef NDEBUG
      57                 :            : #  define NDEBUG
      58                 :            : # endif
      59                 :            : #endif
      60                 :            : #include <assert.h>
      61                 :            : 
      62                 :            : /* The input and output encrypted as though 128bit ofb 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                 :         80 : void CRYPTO_ofb128_encrypt(const unsigned char *in, unsigned char *out,
      67                 :            :                         size_t len, const void *key,
      68                 :            :                         unsigned char ivec[16], int *num,
      69                 :            :                         block128_f block)
      70                 :            : {
      71                 :            :         unsigned int n;
      72                 :         80 :         size_t l=0;
      73                 :            : 
      74                 :            :         assert(in && out && key && ivec && num);
      75                 :            : 
      76                 :         80 :         n = *num;
      77                 :            : 
      78                 :            : #if !defined(OPENSSL_SMALL_FOOTPRINT)
      79                 :            :         if (16%sizeof(size_t) == 0) do { /* always true actually */
      80         [ +  + ]:        358 :                 while (n && len) {
      81                 :        278 :                         *(out++) = *(in++) ^ ivec[n];
      82                 :        278 :                         --len;
      83                 :        278 :                         n = (n+1) % 16;
      84                 :            :                 }
      85                 :            : #if defined(STRICT_ALIGNMENT)
      86                 :            :                 if (((size_t)in|(size_t)out|(size_t)ivec)%sizeof(size_t) != 0)
      87                 :            :                         break;
      88                 :            : #endif
      89         [ +  + ]:        352 :                 while (len>=16) {
      90                 :        272 :                         (*block)(ivec, ivec, key);
      91         [ +  + ]:        816 :                         for (; n<16; n+=sizeof(size_t))
      92                 :       1088 :                                 *(size_t*)(out+n) =
      93                 :        544 :                                 *(size_t*)(in+n) ^ *(size_t*)(ivec+n);
      94                 :        272 :                         len -= 16;
      95                 :        272 :                         out += 16;
      96                 :        272 :                         in  += 16;
      97                 :        272 :                         n = 0;
      98                 :            :                 }
      99         [ +  + ]:         80 :                 if (len) {
     100                 :         32 :                         (*block)(ivec, ivec, key);
     101         [ +  + ]:        234 :                         while (len--) {
     102                 :        202 :                                 out[n] = in[n] ^ ivec[n];
     103                 :        202 :                                 ++n;
     104                 :            :                         }
     105                 :            :                 }
     106                 :         80 :                 *num = n;
     107                 :         80 :                 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] = in[l] ^ ivec[n];
     116                 :            :                 ++l;
     117                 :            :                 n = (n+1) % 16;
     118                 :            :         }
     119                 :            : 
     120                 :            :         *num=n;
     121                 :            : }

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