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annotate lib/hmac.c @ 40231:9b3c79fdfe0b

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strtod: fix clash with strtold Problem reported for RHEL 5 by Jesse Caldwell (Bug#34817). * lib/strtod.c (compute_minus_zero, minus_zero): Simplify by remving the macro / external variable, and having just a function. User changed. This avoids the need for an external variable that might clash.
author Paul Eggert <eggert@cs.ucla.edu>
date Mon, 11 Mar 2019 16:40:29 -0700
parents b06060465f09
children
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1 /* hmac.c -- hashed message authentication codes
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2 Copyright (C) 2005-2006, 2009-2019 Free Software Foundation, Inc.
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3
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4 This program is free software; you can redistribute it and/or modify
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5 it under the terms of the GNU General Public License as published by
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6 the Free Software Foundation; either version 2, or (at your option)
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7 any later version.
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8
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9 This program is distributed in the hope that it will be useful,
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10 but WITHOUT ANY WARRANTY; without even the implied warranty of
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11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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12 GNU General Public License for more details.
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13
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14 You should have received a copy of the GNU General Public License
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15 along with this program; if not, see <https://www.gnu.org/licenses/>. */
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16
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17 #include <string.h>
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18
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19 #include "memxor.h"
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20
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21 #define IPAD 0x36
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22 #define OPAD 0x5c
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23
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24 /* Concatenate two preprocessor tokens. */
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25 #define _GLHMAC_CONCAT_(prefix, suffix) prefix##suffix
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26 #define _GLHMAC_CONCAT(prefix, suffix) _GLHMAC_CONCAT_ (prefix, suffix)
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27
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28 #if GL_HMAC_NAME == 5
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29 # define HMAC_ALG md5
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30 #else
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31 # define HMAC_ALG _GLHMAC_CONCAT (sha, GL_HMAC_NAME)
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32 #endif
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33
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34 #define GL_HMAC_CTX _GLHMAC_CONCAT (HMAC_ALG, _ctx)
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35 #define GL_HMAC_FN _GLHMAC_CONCAT (hmac_, HMAC_ALG)
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36 #define GL_HMAC_FN_INIT _GLHMAC_CONCAT (HMAC_ALG, _init_ctx)
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37 #define GL_HMAC_FN_BLOC _GLHMAC_CONCAT (HMAC_ALG, _process_block)
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38 #define GL_HMAC_FN_PROC _GLHMAC_CONCAT (HMAC_ALG, _process_bytes)
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39 #define GL_HMAC_FN_FINI _GLHMAC_CONCAT (HMAC_ALG, _finish_ctx)
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40
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41 static void
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42 hmac_hash (const void *key, size_t keylen,
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43 const void *in, size_t inlen,
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44 int pad, void *resbuf)
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45 {
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46 struct GL_HMAC_CTX hmac_ctx;
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47 char block[GL_HMAC_BLOCKSIZE];
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48
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49 memset (block, pad, sizeof block);
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50 memxor (block, key, keylen);
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51
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52 GL_HMAC_FN_INIT (&hmac_ctx);
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53 GL_HMAC_FN_BLOC (block, sizeof block, &hmac_ctx);
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54 GL_HMAC_FN_PROC (in, inlen, &hmac_ctx);
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55 GL_HMAC_FN_FINI (&hmac_ctx, resbuf);
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56 }
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57
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58 int
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59 GL_HMAC_FN (const void *key, size_t keylen,
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60 const void *in, size_t inlen, void *resbuf)
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61 {
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62 char optkeybuf[GL_HMAC_HASHSIZE];
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63 char innerhash[GL_HMAC_HASHSIZE];
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64
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65 /* Ensure key size is <= block size. */
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66 if (keylen > GL_HMAC_BLOCKSIZE)
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67 {
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68 struct GL_HMAC_CTX keyhash;
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69
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70 GL_HMAC_FN_INIT (&keyhash);
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71 GL_HMAC_FN_PROC (key, keylen, &keyhash);
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72 GL_HMAC_FN_FINI (&keyhash, optkeybuf);
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73
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74 key = optkeybuf;
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75 /* zero padding of the key to the block size
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76 is implicit in the memxor. */
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77 keylen = sizeof optkeybuf;
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78 }
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79
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80 /* Compute INNERHASH from KEY and IN. */
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81 hmac_hash (key, keylen, in, inlen, IPAD, innerhash);
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82
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83 /* Compute result from KEY and INNERHASH. */
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84 hmac_hash (key, keylen, innerhash, sizeof innerhash, OPAD, resbuf);
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85
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86 return 0;
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87 }