Mercurial > dropbear
annotate libtomcrypt/src/encauth/ccm/ccm_done.c @ 1804:f0cd000f3bca
Prevent multiple shells being spawned
Existing shells would be leaked.
The old check only caught multiple commands, not shells.
author | Matt Johnston <matt@ucc.asn.au> |
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date | Sat, 06 Mar 2021 23:06:43 +0800 |
parents | 6dba84798cd5 |
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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 #include "tomcrypt.h" |
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10 |
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11 #ifdef LTC_CCM_MODE |
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12 |
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13 /** |
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14 Terminate a CCM stream |
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15 @param ccm The CCM state |
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16 @param tag [out] The destination for the MAC tag |
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17 @param taglen [in/out] The length of the MAC tag |
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18 @return CRYPT_OK on success |
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19 */ |
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20 int ccm_done(ccm_state *ccm, |
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21 unsigned char *tag, unsigned long *taglen) |
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22 { |
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23 unsigned long x, y; |
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24 int err; |
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25 |
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26 LTC_ARGCHK(ccm != NULL); |
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27 |
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28 /* Check all data have been processed */ |
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29 if (ccm->ptlen != ccm->current_ptlen) { |
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30 return CRYPT_ERROR; |
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31 } |
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32 |
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33 LTC_ARGCHK(tag != NULL); |
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34 LTC_ARGCHK(taglen != NULL); |
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35 |
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36 if (ccm->x != 0) { |
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37 if ((err = cipher_descriptor[ccm->cipher].ecb_encrypt(ccm->PAD, ccm->PAD, &ccm->K)) != CRYPT_OK) { |
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38 return err; |
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39 } |
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40 } |
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41 |
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42 /* setup CTR for the TAG (zero the count) */ |
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43 for (y = 15; y > 15 - ccm->L; y--) { |
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44 ccm->ctr[y] = 0x00; |
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45 } |
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46 if ((err = cipher_descriptor[ccm->cipher].ecb_encrypt(ccm->ctr, ccm->CTRPAD, &ccm->K)) != CRYPT_OK) { |
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47 return err; |
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48 } |
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49 |
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50 cipher_descriptor[ccm->cipher].done(&ccm->K); |
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51 |
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52 /* store the TAG */ |
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53 for (x = 0; x < 16 && x < *taglen; x++) { |
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54 tag[x] = ccm->PAD[x] ^ ccm->CTRPAD[x]; |
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55 } |
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56 *taglen = x; |
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57 |
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58 return CRYPT_OK; |
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59 } |
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60 |
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61 #endif |
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62 |
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63 /* ref: $Format:%D$ */ |
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64 /* git commit: $Format:%H$ */ |
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65 /* commit time: $Format:%ai$ */ |