Mercurial > dropbear

annotate libtomcrypt/src/mac/xcbc/xcbc_done.c @ 1607:0bdbb9ecc403

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avoid leak of ecdh public key
author Matt Johnston <matt@ucc.asn.au>
date Thu, 08 Mar 2018 23:51:33 +0800
parents 6dba84798cd5
children
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382
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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 xcbc_done.c
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13 XCBC Support, terminate the state
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14 */
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15
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16 #ifdef LTC_XCBC
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17
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18 /** Terminate the XCBC-MAC state
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19 @param xcbc XCBC state to terminate
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20 @param out [out] Destination for the MAC tag
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21 @param outlen [in/out] Destination size and final tag size
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22 Return CRYPT_OK on success
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23 */
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24 int xcbc_done(xcbc_state *xcbc, unsigned char *out, unsigned long *outlen)
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25 {
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26 int err, x;
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27 LTC_ARGCHK(xcbc != NULL);
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28 LTC_ARGCHK(out != NULL);
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29
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30 /* check structure */
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31 if ((err = cipher_is_valid(xcbc->cipher)) != CRYPT_OK) {
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32 return err;
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33 }
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34
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35 if ((xcbc->blocksize > cipher_descriptor[xcbc->cipher].block_length) || (xcbc->blocksize < 0) ||
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36 (xcbc->buflen > xcbc->blocksize) || (xcbc->buflen < 0)) {
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37 return CRYPT_INVALID_ARG;
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38 }
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39
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40 /* which key do we use? */
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41 if (xcbc->buflen == xcbc->blocksize) {
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42 /* k2 */
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43 for (x = 0; x < xcbc->blocksize; x++) {
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44 xcbc->IV[x] ^= xcbc->K[1][x];
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45 }
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46 } else {
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47 xcbc->IV[xcbc->buflen] ^= 0x80;
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48 /* k3 */
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49 for (x = 0; x < xcbc->blocksize; x++) {
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50 xcbc->IV[x] ^= xcbc->K[2][x];
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51 }
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52 }
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53
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54 /* encrypt */
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55 cipher_descriptor[xcbc->cipher].ecb_encrypt(xcbc->IV, xcbc->IV, &xcbc->key);
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56 cipher_descriptor[xcbc->cipher].done(&xcbc->key);
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57
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58 /* extract tag */
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59 for (x = 0; x < xcbc->blocksize && (unsigned long)x < *outlen; x++) {
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60 out[x] = xcbc->IV[x];
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61 }
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62 *outlen = x;
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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63
382
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64 #ifdef LTC_CLEAN_STACK
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65 zeromem(xcbc, sizeof(*xcbc));
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66 #endif
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67 return CRYPT_OK;
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68 }
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69
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70 #endif
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71
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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72 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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73 /* git commit: $Format:%H$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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74 /* commit time: $Format:%ai$ */
382
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75