LCOV - code coverage report
Current view: top level - lib/gl - hmac-sha1.c (source / functions) Hit Total Coverage
Test: GNU SASL Lines: 15 20 75.0 %
Date: 2012-05-28 Functions: 1 1 100.0 %
Legend: Lines: hit not hit | Branches: + taken - not taken # not executed Branches: 1 2 50.0 %

           Branch data     Line data    Source code
       1                 :            : /* hmac-sha1.c -- hashed message authentication codes
       2                 :            :    Copyright (C) 2005-2006, 2009-2012 Free Software Foundation, Inc.
       3                 :            : 
       4                 :            :    This program is free software; you can redistribute it and/or modify
       5                 :            :    it under the terms of the GNU Lesser General Public License as published by
       6                 :            :    the Free Software Foundation; either version 2.1, or (at your option)
       7                 :            :    any later version.
       8                 :            : 
       9                 :            :    This program is distributed in the hope that it will be useful,
      10                 :            :    but WITHOUT ANY WARRANTY; without even the implied warranty of
      11                 :            :    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      12                 :            :    GNU Lesser General Public License for more details.
      13                 :            : 
      14                 :            :    You should have received a copy of the GNU Lesser General Public License
      15                 :            :    along with this program; if not, see <http://www.gnu.org/licenses/>.  */
      16                 :            : 
      17                 :            : /* Written by Simon Josefsson.  */
      18                 :            : 
      19                 :            : #include <config.h>
      20                 :            : 
      21                 :            : #include "hmac.h"
      22                 :            : 
      23                 :            : #include "memxor.h"
      24                 :            : #include "sha1.h"
      25                 :            : 
      26                 :            : #include <string.h>
      27                 :            : 
      28                 :            : #define IPAD 0x36
      29                 :            : #define OPAD 0x5c
      30                 :            : 
      31                 :            : int
      32                 :          3 : hmac_sha1 (const void *key, size_t keylen,
      33                 :            :            const void *in, size_t inlen, void *resbuf)
      34                 :            : {
      35                 :            :   struct sha1_ctx inner;
      36                 :            :   struct sha1_ctx outer;
      37                 :            :   char optkeybuf[20];
      38                 :            :   char block[64];
      39                 :            :   char innerhash[20];
      40                 :            : 
      41                 :            :   /* Reduce the key's size, so that it becomes <= 64 bytes large.  */
      42                 :            : 
      43         [ -  + ]:          3 :   if (keylen > 64)
      44                 :            :     {
      45                 :            :       struct sha1_ctx keyhash;
      46                 :            : 
      47                 :          0 :       sha1_init_ctx (&keyhash);
      48                 :          0 :       sha1_process_bytes (key, keylen, &keyhash);
      49                 :          0 :       sha1_finish_ctx (&keyhash, optkeybuf);
      50                 :            : 
      51                 :          0 :       key = optkeybuf;
      52                 :          0 :       keylen = 20;
      53                 :            :     }
      54                 :            : 
      55                 :            :   /* Compute INNERHASH from KEY and IN.  */
      56                 :            : 
      57                 :          3 :   sha1_init_ctx (&inner);
      58                 :            : 
      59                 :          3 :   memset (block, IPAD, sizeof (block));
      60                 :          3 :   memxor (block, key, keylen);
      61                 :            : 
      62                 :          3 :   sha1_process_block (block, 64, &inner);
      63                 :          3 :   sha1_process_bytes (in, inlen, &inner);
      64                 :            : 
      65                 :          3 :   sha1_finish_ctx (&inner, innerhash);
      66                 :            : 
      67                 :            :   /* Compute result from KEY and INNERHASH.  */
      68                 :            : 
      69                 :          3 :   sha1_init_ctx (&outer);
      70                 :            : 
      71                 :          3 :   memset (block, OPAD, sizeof (block));
      72                 :          3 :   memxor (block, key, keylen);
      73                 :            : 
      74                 :          3 :   sha1_process_block (block, 64, &outer);
      75                 :          3 :   sha1_process_bytes (innerhash, 20, &outer);
      76                 :            : 
      77                 :          3 :   sha1_finish_ctx (&outer, resbuf);
      78                 :            : 
      79                 :          3 :   return 0;
      80                 :            : }

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