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annotate libtomcrypt/src/mac/blake2/blake2bmac_file.c @ 1680:5e763ad6e2e0

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author Matt Johnston <matt@ucc.asn.au>
date Sun, 24 May 2020 13:34:19 +0800
parents 6dba84798cd5
children e9dba7abd939
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1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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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
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10 #include "tomcrypt.h"
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11
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12 #ifdef LTC_BLAKE2BMAC
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13
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14 /**
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15 BLAKE2B MAC a file
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16 @param fname The name of the file you wish to BLAKE2B MAC
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17 @param key The secret key
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18 @param keylen The length of the secret key
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19 @param mac [out] The BLAKE2B MAC authentication tag
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20 @param maclen [in/out] The max size and resulting size of the authentication tag
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21 @return CRYPT_OK if successful, CRYPT_NOP if file support has been disabled
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22 */
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23 int blake2bmac_file(const char *fname, const unsigned char *key, unsigned long keylen, unsigned char *mac, unsigned long *maclen)
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24 {
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25 #ifdef LTC_NO_FILE
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26 return CRYPT_NOP;
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27 #else
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28 blake2bmac_state st;
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29 FILE *in;
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30 unsigned char *buf;
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31 size_t x;
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32 int err;
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33
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34 LTC_ARGCHK(fname != NULL);
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35 LTC_ARGCHK(key != NULL);
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36 LTC_ARGCHK(mac != NULL);
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37 LTC_ARGCHK(maclen != NULL);
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38
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39 if ((buf = XMALLOC(LTC_FILE_READ_BUFSIZE)) == NULL) {
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40 return CRYPT_MEM;
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41 }
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42
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43 if ((err = blake2bmac_init(&st, *maclen, key, keylen)) != CRYPT_OK) {
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44 goto LBL_ERR;
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45 }
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46
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47 in = fopen(fname, "rb");
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48 if (in == NULL) {
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49 err = CRYPT_FILE_NOTFOUND;
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50 goto LBL_ERR;
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51 }
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52
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53 do {
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54 x = fread(buf, 1, LTC_FILE_READ_BUFSIZE, in);
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55 if ((err = blake2bmac_process(&st, buf, (unsigned long)x)) != CRYPT_OK) {
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56 fclose(in);
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57 goto LBL_CLEANBUF;
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58 }
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59 } while (x == LTC_FILE_READ_BUFSIZE);
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60
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61 if (fclose(in) != 0) {
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62 err = CRYPT_ERROR;
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63 goto LBL_CLEANBUF;
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64 }
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65
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66 err = blake2bmac_done(&st, mac, maclen);
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67
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68 LBL_CLEANBUF:
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69 zeromem(buf, LTC_FILE_READ_BUFSIZE);
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70 LBL_ERR:
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71 #ifdef LTC_CLEAN_STACK
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72 zeromem(&st, sizeof(blake2bmac_state));
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73 #endif
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74 XFREE(buf);
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75 return err;
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76 #endif
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77 }
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78
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79 #endif
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80
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81 /* ref: $Format:%D$ */
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82 /* git commit: $Format:%H$ */
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83 /* commit time: $Format:%ai$ */