Mercurial > dropbear

annotate libtomcrypt/src/mac/omac/omac_file.c @ 1619:a3bb8f8949de

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Merge writev #include fix
author Matt Johnston <matt@ucc.asn.au>
date Sun, 26 Aug 2018 22:26:42 +0800
parents 6dba84798cd5
children e9dba7abd939
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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 #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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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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34 return CRYPT_NOP;
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35 #else
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36 size_t x;
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37 int err;
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38 omac_state omac;
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39 FILE *in;
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40 unsigned char *buf;
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41
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42 LTC_ARGCHK(key != NULL);
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43 LTC_ARGCHK(filename != NULL);
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44 LTC_ARGCHK(out != NULL);
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45 LTC_ARGCHK(outlen != NULL);
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46
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47 if ((buf = XMALLOC(LTC_FILE_READ_BUFSIZE)) == NULL) {
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48 return CRYPT_MEM;
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49 }
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50
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51 if ((err = omac_init(&omac, cipher, key, keylen)) != CRYPT_OK) {
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52 goto LBL_ERR;
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53 }
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54
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55 in = fopen(filename, "rb");
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56 if (in == NULL) {
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57 err = CRYPT_FILE_NOTFOUND;
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58 goto LBL_ERR;
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59 }
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60
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61 do {
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62 x = fread(buf, 1, LTC_FILE_READ_BUFSIZE, in);
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63 if ((err = omac_process(&omac, buf, (unsigned long)x)) != CRYPT_OK) {
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64 fclose(in);
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65 goto LBL_CLEANBUF;
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66 }
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67 } while (x == LTC_FILE_READ_BUFSIZE);
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68
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69 if (fclose(in) != 0) {
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70 err = CRYPT_ERROR;
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71 goto LBL_CLEANBUF;
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72 }
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73
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74 err = omac_done(&omac, out, outlen);
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75
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76 LBL_CLEANBUF:
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77 zeromem(buf, LTC_FILE_READ_BUFSIZE);
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78 LBL_ERR:
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79 #ifdef LTC_CLEAN_STACK
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80 zeromem(&omac, sizeof(omac_state));
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81 #endif
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82 XFREE(buf);
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83 return err;
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84 #endif
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85 }
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87 #endif
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88
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89 /* ref: $Format:%D$ */
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90 /* git commit: $Format:%H$ */
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91 /* commit time: $Format:%ai$ */