LCOV - code coverage report
Current view: top level - des - cfb64ede.c (source / functions) Hit Total Coverage
Test: lcov_coverage_final.info Lines: 43 107 40.2 %
Date: 2014-08-02 Functions: 1 2 50.0 %
Branches: 10 74 13.5 %

           Branch data     Line data    Source code
       1                 :            : /* crypto/des/cfb64ede.c */
       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 "e_os.h"
      61                 :            : 
      62                 :            : /* The input and output encrypted as though 64bit cfb mode is being
      63                 :            :  * used.  The extra state information to record how much of the
      64                 :            :  * 64bit block we have used is contained in *num;
      65                 :            :  */
      66                 :            : 
      67                 :         68 : void DES_ede3_cfb64_encrypt(const unsigned char *in, unsigned char *out,
      68                 :            :                             long length, DES_key_schedule *ks1,
      69                 :            :                             DES_key_schedule *ks2, DES_key_schedule *ks3,
      70                 :            :                             DES_cblock *ivec, int *num, int enc)
      71                 :            :         {
      72                 :            :         register DES_LONG v0,v1;
      73                 :         68 :         register long l=length;
      74                 :         68 :         register int n= *num;
      75                 :            :         DES_LONG ti[2];
      76                 :            :         unsigned char *iv,c,cc;
      77                 :            : 
      78                 :         68 :         iv=&(*ivec)[0];
      79         [ +  + ]:         68 :         if (enc)
      80                 :            :                 {
      81         [ +  + ]:       4126 :                 while (l--)
      82                 :            :                         {
      83         [ +  + ]:       4088 :                         if (n == 0)
      84                 :            :                                 {
      85                 :        511 :                                 c2l(iv,v0);
      86                 :        511 :                                 c2l(iv,v1);
      87                 :            : 
      88                 :        511 :                                 ti[0]=v0;
      89                 :        511 :                                 ti[1]=v1;
      90                 :        511 :                                 DES_encrypt3(ti,ks1,ks2,ks3);
      91                 :        511 :                                 v0=ti[0];
      92                 :        511 :                                 v1=ti[1];
      93                 :            : 
      94                 :        511 :                                 iv = &(*ivec)[0];
      95                 :        511 :                                 l2c(v0,iv);
      96                 :        511 :                                 l2c(v1,iv);
      97                 :        511 :                                 iv = &(*ivec)[0];
      98                 :            :                                 }
      99                 :       4088 :                         c= *(in++)^iv[n];
     100                 :       4088 :                         *(out++)=c;
     101                 :       4088 :                         iv[n]=c;
     102                 :       4088 :                         n=(n+1)&0x07;
     103                 :            :                         }
     104                 :            :                 }
     105                 :            :         else
     106                 :            :                 {
     107         [ +  + ]:       4118 :                 while (l--)
     108                 :            :                         {
     109         [ +  + ]:       4088 :                         if (n == 0)
     110                 :            :                                 {
     111                 :        511 :                                 c2l(iv,v0);
     112                 :        511 :                                 c2l(iv,v1);
     113                 :            : 
     114                 :        511 :                                 ti[0]=v0;
     115                 :        511 :                                 ti[1]=v1;
     116                 :        511 :                                 DES_encrypt3(ti,ks1,ks2,ks3);
     117                 :        511 :                                 v0=ti[0];
     118                 :        511 :                                 v1=ti[1];
     119                 :            : 
     120                 :        511 :                                 iv = &(*ivec)[0];
     121                 :        511 :                                 l2c(v0,iv);
     122                 :        511 :                                 l2c(v1,iv);
     123                 :        511 :                                 iv = &(*ivec)[0];
     124                 :            :                                 }
     125                 :       4088 :                         cc= *(in++);
     126                 :       4088 :                         c=iv[n];
     127                 :       4088 :                         iv[n]=cc;
     128                 :       4088 :                         *(out++)=c^cc;
     129                 :       4088 :                         n=(n+1)&0x07;
     130                 :            :                         }
     131                 :            :                 }
     132                 :         68 :         v0=v1=ti[0]=ti[1]=c=cc=0;
     133                 :         68 :         *num=n;
     134                 :         68 :         }
     135                 :            : 
     136                 :            : #ifdef undef /* MACRO */
     137                 :            : void DES_ede2_cfb64_encrypt(unsigned char *in, unsigned char *out, long length,
     138                 :            :              DES_key_schedule ks1, DES_key_schedule ks2, DES_cblock (*ivec),
     139                 :            :              int *num, int enc)
     140                 :            :         {
     141                 :            :         DES_ede3_cfb64_encrypt(in,out,length,ks1,ks2,ks1,ivec,num,enc);
     142                 :            :         }
     143                 :            : #endif
     144                 :            : 
     145                 :            : /* This is compatible with the single key CFB-r for DES, even thought that's
     146                 :            :  * not what EVP needs.
     147                 :            :  */
     148                 :            : 
     149                 :          0 : void DES_ede3_cfb_encrypt(const unsigned char *in,unsigned char *out,
     150                 :            :                           int numbits,long length,DES_key_schedule *ks1,
     151                 :            :                           DES_key_schedule *ks2,DES_key_schedule *ks3,
     152                 :            :                           DES_cblock *ivec,int enc)
     153                 :            :         {
     154                 :            :         register DES_LONG d0,d1,v0,v1;
     155                 :          0 :         register unsigned long l=length,n=((unsigned int)numbits+7)/8;
     156                 :          0 :         register int num=numbits,i;
     157                 :            :         DES_LONG ti[2];
     158                 :            :         unsigned char *iv;
     159                 :            :         unsigned char ovec[16];
     160                 :            : 
     161         [ #  # ]:          0 :         if (num > 64) return;
     162                 :          0 :         iv = &(*ivec)[0];
     163                 :          0 :         c2l(iv,v0);
     164                 :          0 :         c2l(iv,v1);
     165         [ #  # ]:          0 :         if (enc)
     166                 :            :                 {
     167         [ #  # ]:          0 :                 while (l >= n)
     168                 :            :                         {
     169                 :          0 :                         l-=n;
     170                 :          0 :                         ti[0]=v0;
     171                 :          0 :                         ti[1]=v1;
     172                 :          0 :                         DES_encrypt3(ti,ks1,ks2,ks3);
     173   [ #  #  #  #  :          0 :                         c2ln(in,d0,d1,n);
             #  #  #  #  
                      # ]
     174                 :          0 :                         in+=n;
     175                 :          0 :                         d0^=ti[0];
     176                 :          0 :                         d1^=ti[1];
     177   [ #  #  #  #  :          0 :                         l2cn(d0,d1,out,n);
             #  #  #  #  
                      # ]
     178                 :          0 :                         out+=n;
     179                 :            :                         /* 30-08-94 - eay - changed because l>>32 and
     180                 :            :                          * l<<32 are bad under gcc :-( */
     181         [ #  # ]:          0 :                         if (num == 32)
     182                 :            :                                 { v0=v1; v1=d0; }
     183         [ #  # ]:          0 :                         else if (num == 64)
     184                 :            :                                 { v0=d0; v1=d1; }
     185                 :            :                         else
     186                 :            :                                 {
     187                 :          0 :                                 iv=&ovec[0];
     188                 :          0 :                                 l2c(v0,iv);
     189                 :          0 :                                 l2c(v1,iv);
     190                 :          0 :                                 l2c(d0,iv);
     191                 :          0 :                                 l2c(d1,iv);
     192                 :            :                                 /* shift ovec left most of the bits... */
     193         [ #  # ]:          0 :                                 memmove(ovec,ovec+num/8,8+(num%8 ? 1 : 0));
     194                 :            :                                 /* now the remaining bits */
     195         [ #  # ]:          0 :                                 if(num%8 != 0)
     196         [ #  # ]:          0 :                                         for(i=0 ; i < 8 ; ++i)
     197                 :            :                                                 {
     198                 :          0 :                                                 ovec[i]<<=num%8;
     199                 :          0 :                                                 ovec[i]|=ovec[i+1]>>(8-num%8);
     200                 :            :                                                 }
     201                 :          0 :                                 iv=&ovec[0];
     202                 :          0 :                                 c2l(iv,v0);
     203                 :          0 :                                 c2l(iv,v1);
     204                 :            :                                 }
     205                 :            :                         }
     206                 :            :                 }
     207                 :            :         else
     208                 :            :                 {
     209         [ #  # ]:          0 :                 while (l >= n)
     210                 :            :                         {
     211                 :          0 :                         l-=n;
     212                 :          0 :                         ti[0]=v0;
     213                 :          0 :                         ti[1]=v1;
     214                 :          0 :                         DES_encrypt3(ti,ks1,ks2,ks3);
     215   [ #  #  #  #  :          0 :                         c2ln(in,d0,d1,n);
             #  #  #  #  
                      # ]
     216                 :          0 :                         in+=n;
     217                 :            :                         /* 30-08-94 - eay - changed because l>>32 and
     218                 :            :                          * l<<32 are bad under gcc :-( */
     219         [ #  # ]:          0 :                         if (num == 32)
     220                 :            :                                 { v0=v1; v1=d0; }
     221         [ #  # ]:          0 :                         else if (num == 64)
     222                 :            :                                 { v0=d0; v1=d1; }
     223                 :            :                         else
     224                 :            :                                 {
     225                 :          0 :                                 iv=&ovec[0];
     226                 :          0 :                                 l2c(v0,iv);
     227                 :          0 :                                 l2c(v1,iv);
     228                 :          0 :                                 l2c(d0,iv);
     229                 :          0 :                                 l2c(d1,iv);
     230                 :            :                                 /* shift ovec left most of the bits... */
     231         [ #  # ]:          0 :                                 memmove(ovec,ovec+num/8,8+(num%8 ? 1 : 0));
     232                 :            :                                 /* now the remaining bits */
     233         [ #  # ]:          0 :                                 if(num%8 != 0)
     234         [ #  # ]:          0 :                                         for(i=0 ; i < 8 ; ++i)
     235                 :            :                                                 {
     236                 :          0 :                                                 ovec[i]<<=num%8;
     237                 :          0 :                                                 ovec[i]|=ovec[i+1]>>(8-num%8);
     238                 :            :                                                 }
     239                 :          0 :                                 iv=&ovec[0];
     240                 :          0 :                                 c2l(iv,v0);
     241                 :          0 :                                 c2l(iv,v1);
     242                 :            :                                 }
     243                 :          0 :                         d0^=ti[0];
     244                 :          0 :                         d1^=ti[1];
     245   [ #  #  #  #  :          0 :                         l2cn(d0,d1,out,n);
             #  #  #  #  
                      # ]
     246                 :          0 :                         out+=n;
     247                 :            :                         }
     248                 :            :                 }
     249                 :          0 :         iv = &(*ivec)[0];
     250                 :          0 :         l2c(v0,iv);
     251                 :          0 :         l2c(v1,iv);
     252                 :          0 :         v0=v1=d0=d1=ti[0]=ti[1]=0;
     253                 :            :         }
     254                 :            : 

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