Mercurial > dropbear

annotate libtomcrypt/src/mac/omac/omac_file.c @ 1711:e9dba7abd939

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Merge libtomcrypt v1.18.2
author Matt Johnston <matt@ucc.asn.au>
date Wed, 10 Jun 2020 23:16:13 +0800
parents 6dba84798cd5
children
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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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9 #include "tomcrypt.h"
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10
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11 /**
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12 @file omac_file.c
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13 OMAC1 support, process a file, Tom St Denis
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14 */
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15
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16 #ifdef LTC_OMAC
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17
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18 /**
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19 OMAC a file
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20 @param cipher The index of the cipher desired
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21 @param key The secret key
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22 @param keylen The length of the secret key (octets)
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23 @param filename The name of the file you wish to OMAC
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24 @param out [out] Where the authentication tag is to be stored
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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 */
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28 int omac_file(int cipher,
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29 const unsigned char *key, unsigned long keylen,
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30 const char *filename,
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31 unsigned char *out, unsigned long *outlen)
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32 {
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33 #ifdef LTC_NO_FILE
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e9dba7abd939 Merge libtomcrypt v1.18.2
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34 LTC_UNUSED_PARAM(cipher);
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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(filename);
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38 LTC_UNUSED_PARAM(out);
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39 LTC_UNUSED_PARAM(outlen);
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40 return CRYPT_NOP;
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41 #else
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42 size_t x;
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43 int err;
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44 omac_state omac;
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45 FILE *in;
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46 unsigned char *buf;
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47
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48 LTC_ARGCHK(key != NULL);
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49 LTC_ARGCHK(filename != NULL);
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50 LTC_ARGCHK(out != NULL);
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51 LTC_ARGCHK(outlen != NULL);
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52
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53 if ((buf = XMALLOC(LTC_FILE_READ_BUFSIZE)) == NULL) {
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54 return CRYPT_MEM;
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55 }
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56
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57 if ((err = omac_init(&omac, cipher, key, keylen)) != CRYPT_OK) {
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58 goto LBL_ERR;
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59 }
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60
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61 in = fopen(filename, "rb");
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62 if (in == NULL) {
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63 err = CRYPT_FILE_NOTFOUND;
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64 goto LBL_ERR;
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65 }
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66
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67 do {
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68 x = fread(buf, 1, LTC_FILE_READ_BUFSIZE, in);
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69 if ((err = omac_process(&omac, buf, (unsigned long)x)) != CRYPT_OK) {
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70 fclose(in);
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71 goto LBL_CLEANBUF;
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72 }
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73 } while (x == LTC_FILE_READ_BUFSIZE);
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74
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75 if (fclose(in) != 0) {
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76 err = CRYPT_ERROR;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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77 goto LBL_CLEANBUF;
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78 }
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79
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80 err = omac_done(&omac, out, outlen);
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81
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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82 LBL_CLEANBUF:
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83 zeromem(buf, LTC_FILE_READ_BUFSIZE);
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84 LBL_ERR:
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85 #ifdef LTC_CLEAN_STACK
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86 zeromem(&omac, sizeof(omac_state));
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87 #endif
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88 XFREE(buf);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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89 return err;
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90 #endif
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91 }
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92
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93 #endif
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94
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95 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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96 /* git commit: $Format:%H$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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97 /* commit time: $Format:%ai$ */