Mercurial > dropbear

annotate libtomcrypt/src/mac/omac/omac_file.c @ 1665:7c17995bcdfb

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Improve address logging on early exit messages (#83) Change 'Early exit' and 'Exit before auth' messages to include the IP address & port as part of the message. This allows log scanning utilities such as 'fail2ban' to obtain the offending IP address as part of the failure event instead of extracting the PID from the message and then scanning the log again for match 'child connection from' messages Signed-off-by: Kevin Darbyshire-Bryant <[email protected]>
author Kevin Darbyshire-Bryant <6500011+ldir-EDB0@users.noreply.github.com>
date Wed, 18 Mar 2020 15:28:56 +0000
parents 6dba84798cd5
children e9dba7abd939
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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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: $Format:%ai$ */