Mercurial > dropbear

annotate libtomcrypt/src/mac/omac/omac_file.c @ 994:5c5ade336926

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Prefer stronger algorithms in algorithm negotiation. Prefer diffie-hellman-group14-sha1 (2048 bit) over diffie-hellman-group1-sha1 (1024 bit). Due to meet-in-the-middle attacks the effective key length of three key 3DES is 112 bits. AES is stronger and faster then 3DES. Prefer to delay the start of compression until after authentication has completed. This avoids exposing compression code to attacks from unauthenticated users. (github pull request #9)
author Fedor Brunner <fedor.brunner@azet.sk>
date Fri, 23 Jan 2015 23:00:25 +0800
parents 0cbe8f6dbf9e
children f849a5ca2efc
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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 * Tom St Denis, [email protected], http://libtomcrypt.com
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10 */
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11 #include "tomcrypt.h"
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12
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13 /**
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14 @file omac_file.c
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15 OMAC1 support, process a file, Tom St Denis
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16 */
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17
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18 #ifdef LTC_OMAC
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20 /**
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21 OMAC a file
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22 @param cipher The index of the cipher desired
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23 @param key The secret key
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24 @param keylen The length of the secret key (octets)
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25 @param filename The name of the file you wish to OMAC
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26 @param out [out] Where the authentication tag is to be stored
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27 @param outlen [in/out] The max size and resulting size of the authentication tag
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28 @return CRYPT_OK if successful, CRYPT_NOP if file support has been disabled
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29 */
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30 int omac_file(int cipher,
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31 const unsigned char *key, unsigned long keylen,
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32 const char *filename,
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33 unsigned char *out, unsigned long *outlen)
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34 {
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35 #ifdef LTC_NO_FILE
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36 return CRYPT_NOP;
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37 #else
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38 int err, x;
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39 omac_state omac;
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40 FILE *in;
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41 unsigned char buf[512];
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43 LTC_ARGCHK(key != NULL);
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44 LTC_ARGCHK(filename != NULL);
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45 LTC_ARGCHK(out != NULL);
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46 LTC_ARGCHK(outlen != NULL);
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47
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48 in = fopen(filename, "rb");
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49 if (in == NULL) {
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50 return CRYPT_FILE_NOTFOUND;
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51 }
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53 if ((err = omac_init(&omac, cipher, key, keylen)) != CRYPT_OK) {
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54 fclose(in);
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55 return 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, sizeof(buf), in);
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60 if ((err = omac_process(&omac, buf, x)) != CRYPT_OK) {
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61 fclose(in);
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62 return err;
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63 }
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64 } while (x == sizeof(buf));
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65 fclose(in);
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66
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67 if ((err = omac_done(&omac, out, outlen)) != CRYPT_OK) {
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68 return err;
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69 }
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71 #ifdef LTC_CLEAN_STACK
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72 zeromem(buf, sizeof(buf));
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73 #endif
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74
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75 return CRYPT_OK;
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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 /* $Source: /cvs/libtom/libtomcrypt/src/mac/omac/omac_file.c,v $ */
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82 /* $Revision: 1.5 $ */
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83 /* $Date: 2006/11/03 00:39:49 $ */