Mercurial > dropbear

annotate libtomcrypt/src/mac/hmac/hmac_file.c @ 1934:83b6a47759a8

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Add m_snprintf() that won't return negative
author Matt Johnston <matt@ucc.asn.au>
date Fri, 01 Apr 2022 12:10:48 +0800
parents e9dba7abd939
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
285
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diff changeset
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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diff changeset
9 #include "tomcrypt.h"
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10
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11 /**
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diff changeset
12 @file hmac_file.c
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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13 HMAC support, process a file, Tom St Denis/Dobes Vandermeer
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14 */
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15
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16 #ifdef LTC_HMAC
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17
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18 /**
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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19 HMAC a file
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20 @param hash The index of the hash you wish to use
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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21 @param fname The name of the file you wish to HMAC
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22 @param key The secret key
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23 @param keylen The length of the secret key
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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24 @param out [out] The HMAC authentication tag
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25 @param outlen [in/out] The max size and resulting size of the authentication tag
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26 @return CRYPT_OK if successful, CRYPT_NOP if file support has been disabled
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27 */
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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28 int hmac_file(int hash, const char *fname,
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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29 const unsigned char *key, unsigned long keylen,
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30 unsigned char *out, unsigned long *outlen)
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31 {
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32 #ifdef LTC_NO_FILE
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33 LTC_UNUSED_PARAM(hash);
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34 LTC_UNUSED_PARAM(fname);
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35 LTC_UNUSED_PARAM(key);
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36 LTC_UNUSED_PARAM(keylen);
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37 LTC_UNUSED_PARAM(out);
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38 LTC_UNUSED_PARAM(outlen);
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39 return CRYPT_NOP;
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40 #else
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41 hmac_state hmac;
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42 FILE *in;
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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43 unsigned char *buf;
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44 size_t x;
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45 int err;
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46
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47 LTC_ARGCHK(fname != NULL);
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48 LTC_ARGCHK(key != NULL);
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49 LTC_ARGCHK(out != NULL);
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50 LTC_ARGCHK(outlen != NULL);
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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51
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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52 if ((buf = XMALLOC(LTC_FILE_READ_BUFSIZE)) == NULL) {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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53 return CRYPT_MEM;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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54 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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55
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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56 if ((err = hash_is_valid(hash)) != CRYPT_OK) {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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57 goto LBL_ERR;
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58 }
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59
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60 if ((err = hmac_init(&hmac, hash, key, keylen)) != CRYPT_OK) {
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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61 goto LBL_ERR;
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62 }
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63
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64 in = fopen(fname, "rb");
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65 if (in == NULL) {
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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66 err = CRYPT_FILE_NOTFOUND;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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67 goto LBL_ERR;
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68 }
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69
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70 do {
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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71 x = fread(buf, 1, LTC_FILE_READ_BUFSIZE, in);
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72 if ((err = hmac_process(&hmac, buf, (unsigned long)x)) != CRYPT_OK) {
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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73 fclose(in); /* we don't trap this error since we're already returning an error! */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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74 goto LBL_CLEANBUF;
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75 }
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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76 } while (x == LTC_FILE_READ_BUFSIZE);
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77
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78 if (fclose(in) != 0) {
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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79 err = CRYPT_ERROR;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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80 goto LBL_CLEANBUF;
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81 }
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82
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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83 err = hmac_done(&hmac, out, outlen);
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84
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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85 LBL_CLEANBUF:
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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86 zeromem(buf, LTC_FILE_READ_BUFSIZE);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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87 LBL_ERR:
285
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88 #ifdef LTC_CLEAN_STACK
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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89 zeromem(&hmac, sizeof(hmac_state));
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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90 #endif
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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91 XFREE(buf);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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92 return err;
285
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diff changeset
93 #endif
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94 }
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95
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96 #endif
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97
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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98 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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99 /* git commit: $Format:%H$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
100 /* commit time: $Format:%ai$ */