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annotate libtomcrypt/src/mac/poly1305/poly1305_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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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 /* The implementation is based on:
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11 * Public Domain poly1305 from Andrew Moon
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12 * https://github.com/floodyberry/poly1305-donna
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13 */
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14
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15 #include "tomcrypt.h"
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16
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17 #ifdef LTC_POLY1305
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18
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19 /**
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20 POLY1305 a file
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21 @param fname The name of the file you wish to POLY1305
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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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24 @param mac [out] The POLY1305 authentication tag
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25 @param maclen [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 poly1305_file(const char *fname, const unsigned char *key, unsigned long keylen, unsigned char *mac, unsigned long *maclen)
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29 {
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30 #ifdef LTC_NO_FILE
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31 LTC_UNUSED_PARAM(fname);
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32 LTC_UNUSED_PARAM(key);
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33 LTC_UNUSED_PARAM(keylen);
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34 LTC_UNUSED_PARAM(mac);
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35 LTC_UNUSED_PARAM(maclen);
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36 return CRYPT_NOP;
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37 #else
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38 poly1305_state st;
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39 FILE *in;
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40 unsigned char *buf;
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41 size_t x;
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42 int err;
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43
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44 LTC_ARGCHK(fname != NULL);
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45 LTC_ARGCHK(key != NULL);
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46 LTC_ARGCHK(mac != NULL);
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47 LTC_ARGCHK(maclen != NULL);
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48
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49 if ((buf = XMALLOC(LTC_FILE_READ_BUFSIZE)) == NULL) {
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50 return CRYPT_MEM;
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51 }
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52
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53 if ((err = poly1305_init(&st, key, keylen)) != CRYPT_OK) {
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54 goto LBL_ERR;
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55 }
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56
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57 in = fopen(fname, "rb");
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58 if (in == NULL) {
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59 err = CRYPT_FILE_NOTFOUND;
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60 goto LBL_ERR;
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61 }
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62
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63 do {
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64 x = fread(buf, 1, LTC_FILE_READ_BUFSIZE, in);
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65 if ((err = poly1305_process(&st, buf, (unsigned long)x)) != CRYPT_OK) {
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66 fclose(in);
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67 goto LBL_CLEANBUF;
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68 }
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69 } while (x == LTC_FILE_READ_BUFSIZE);
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70
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71 if (fclose(in) != 0) {
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72 err = CRYPT_ERROR;
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73 goto LBL_CLEANBUF;
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74 }
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75
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76 err = poly1305_done(&st, mac, maclen);
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77
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78 LBL_CLEANBUF:
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79 zeromem(buf, LTC_FILE_READ_BUFSIZE);
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80 LBL_ERR:
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81 #ifdef LTC_CLEAN_STACK
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82 zeromem(&st, sizeof(poly1305_state));
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83 #endif
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84 XFREE(buf);
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85 return err;
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86 #endif
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87 }
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88
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89 #endif
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90
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91 /* ref: $Format:%D$ */
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92 /* git commit: $Format:%H$ */
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93 /* commit time: $Format:%ai$ */