Mercurial > dropbear
annotate libtomcrypt/src/mac/blake2/blake2smac_file.c @ 1721:4877afd51e04
Added tag DROPBEAR_2020.79 for changeset e2e4929d057b
author | Matt Johnston <matt@ucc.asn.au> |
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date | Mon, 15 Jun 2020 23:51:39 +0800 |
parents | e9dba7abd939 |
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rev | line source |
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1471
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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_BLAKE2SMAC |
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13 |
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14 /** |
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15 BLAKE2S MAC a file |
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16 @param fname The name of the file you wish to BLAKE2S 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 BLAKE2S 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 blake2smac_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 |
1711 | 26 LTC_UNUSED_PARAM(fname); |
27 LTC_UNUSED_PARAM(key); | |
28 LTC_UNUSED_PARAM(keylen); | |
29 LTC_UNUSED_PARAM(mac); | |
30 LTC_UNUSED_PARAM(maclen); | |
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31 return CRYPT_NOP; |
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32 #else |
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33 blake2smac_state st; |
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34 FILE *in; |
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35 unsigned char *buf; |
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36 size_t x; |
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37 int err; |
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38 |
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39 LTC_ARGCHK(fname != NULL); |
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40 LTC_ARGCHK(key != NULL); |
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41 LTC_ARGCHK(mac != NULL); |
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42 LTC_ARGCHK(maclen != NULL); |
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43 |
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44 if ((buf = XMALLOC(LTC_FILE_READ_BUFSIZE)) == NULL) { |
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45 return CRYPT_MEM; |
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46 } |
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47 |
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48 if ((err = blake2smac_init(&st, *maclen, key, keylen)) != CRYPT_OK) { |
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49 goto LBL_ERR; |
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50 } |
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51 |
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52 in = fopen(fname, "rb"); |
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53 if (in == NULL) { |
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54 err = CRYPT_FILE_NOTFOUND; |
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55 goto LBL_ERR; |
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56 } |
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57 |
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58 do { |
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59 x = fread(buf, 1, LTC_FILE_READ_BUFSIZE, in); |
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60 if ((err = blake2smac_process(&st, buf, (unsigned long)x)) != CRYPT_OK) { |
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61 fclose(in); |
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62 goto LBL_CLEANBUF; |
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63 } |
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64 } while (x == LTC_FILE_READ_BUFSIZE); |
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65 |
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66 if (fclose(in) != 0) { |
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67 err = CRYPT_ERROR; |
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68 goto LBL_CLEANBUF; |
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69 } |
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70 |
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71 err = blake2smac_done(&st, mac, maclen); |
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72 |
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73 LBL_CLEANBUF: |
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74 zeromem(buf, LTC_FILE_READ_BUFSIZE); |
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75 LBL_ERR: |
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76 #ifdef LTC_CLEAN_STACK |
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77 zeromem(&st, sizeof(blake2smac_state)); |
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78 #endif |
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79 XFREE(buf); |
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80 return err; |
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81 #endif |
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82 } |
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83 |
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84 #endif |
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85 |
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86 /* ref: $Format:%D$ */ |
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87 /* git commit: $Format:%H$ */ |
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88 /* commit time: $Format:%ai$ */ |