Mercurial > dropbear

annotate libtomcrypt/src/mac/hmac/hmac_file.c @ 1056:a2bfd4374878 nocircbuffer

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Avoid malloc in hmac
author Matt Johnston <matt@ucc.asn.au>
date Sun, 01 Mar 2015 14:46:04 +0800
parents 0cbe8f6dbf9e
children eef377591301
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1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
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2 *
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3 * LibTomCrypt is a library that provides various cryptographic
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4 * algorithms in a highly modular and flexible manner.
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5 *
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6 * The library is free for all purposes without any express
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7 * guarantee it works.
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8 *
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9 * Tom St Denis, [email protected], http://libtomcrypt.com
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10 */
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11 #include "tomcrypt.h"
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12
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13 /**
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14 @file hmac_file.c
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15 HMAC support, process a file, Tom St Denis/Dobes Vandermeer
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16 */
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17
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18 #ifdef LTC_HMAC
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19
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20 /**
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21 HMAC a file
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22 @param hash The index of the hash you wish to use
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23 @param fname The name of the file you wish to HMAC
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24 @param key The secret key
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25 @param keylen The length of the secret key
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26 @param out [out] The HMAC authentication tag
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27 @param outlen [in/out] The max size and resulting size of the authentication tag
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28 @return CRYPT_OK if successful, CRYPT_NOP if file support has been disabled
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29 */
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30 int hmac_file(int hash, const char *fname,
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31 const unsigned char *key, unsigned long keylen,
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32 unsigned char *out, unsigned long *outlen)
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33 {
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34 #ifdef LTC_NO_FILE
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35 return CRYPT_NOP;
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36 #else
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37 hmac_state hmac;
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38 FILE *in;
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39 unsigned char buf[512];
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40 size_t x;
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41 int err;
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42
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43 LTC_ARGCHK(fname != NULL);
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44 LTC_ARGCHK(key != NULL);
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45 LTC_ARGCHK(out != NULL);
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46 LTC_ARGCHK(outlen != NULL);
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47
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48 if((err = hash_is_valid(hash)) != CRYPT_OK) {
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49 return err;
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50 }
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51
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52 if ((err = hmac_init(&hmac, hash, key, keylen)) != CRYPT_OK) {
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53 return err;
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54 }
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55
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56 in = fopen(fname, "rb");
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57 if (in == NULL) {
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58 return CRYPT_FILE_NOTFOUND;
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59 }
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60
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61 /* process the file contents */
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62 do {
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63 x = fread(buf, 1, sizeof(buf), in);
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64 if ((err = hmac_process(&hmac, buf, (unsigned long)x)) != CRYPT_OK) {
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65 /* we don't trap this error since we're already returning an error! */
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66 fclose(in);
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67 return err;
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68 }
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69 } while (x == sizeof(buf));
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70
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71 if (fclose(in) != 0) {
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72 return CRYPT_ERROR;
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73 }
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75 /* get final hmac */
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76 if ((err = hmac_done(&hmac, out, outlen)) != CRYPT_OK) {
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77 return err;
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78 }
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79
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80 #ifdef LTC_CLEAN_STACK
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81 /* clear memory */
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82 zeromem(buf, sizeof(buf));
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83 #endif
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84 return CRYPT_OK;
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85 #endif
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86 }
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87
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88 #endif
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89
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90
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
91 /* $Source: /cvs/libtom/libtomcrypt/src/mac/hmac/hmac_file.c,v $ */
382
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents: 285
diff changeset
92 /* $Revision: 1.5 $ */
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents: 285
diff changeset
93 /* $Date: 2006/11/03 00:39:49 $ */