Mercurial > dropbear
annotate libtomcrypt/src/encauth/ocb/ocb_done_decrypt.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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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 /** |
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11 @file ocb_done_decrypt.c |
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12 OCB implementation, terminate decryption, by Tom St Denis |
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13 */ |
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14 #include "tomcrypt.h" |
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15 |
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16 #ifdef LTC_OCB_MODE |
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17 |
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18 /** |
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19 Terminate a decrypting OCB state |
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20 @param ocb The OCB state |
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21 @param ct The ciphertext (if any) |
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22 @param ctlen The length of the ciphertext (octets) |
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23 @param pt [out] The plaintext |
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24 @param tag The authentication tag (to compare against) |
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25 @param taglen The length of the authentication tag provided |
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26 @param stat [out] The result of the tag comparison |
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27 @return CRYPT_OK if the process was successful regardless if the tag is valid |
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28 */ |
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29 int ocb_done_decrypt(ocb_state *ocb, |
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30 const unsigned char *ct, unsigned long ctlen, |
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31 unsigned char *pt, |
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32 const unsigned char *tag, unsigned long taglen, int *stat) |
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33 { |
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34 int err; |
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35 unsigned char *tagbuf; |
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36 unsigned long tagbuflen; |
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37 |
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38 LTC_ARGCHK(ocb != NULL); |
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39 LTC_ARGCHK(pt != NULL); |
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40 LTC_ARGCHK(ct != NULL); |
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41 LTC_ARGCHK(tag != NULL); |
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42 LTC_ARGCHK(stat != NULL); |
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43 |
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44 /* default to failed */ |
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45 *stat = 0; |
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46 |
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47 /* allocate memory */ |
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48 tagbuf = XMALLOC(MAXBLOCKSIZE); |
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49 if (tagbuf == NULL) { |
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50 return CRYPT_MEM; |
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51 } |
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52 |
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53 tagbuflen = MAXBLOCKSIZE; |
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54 if ((err = s_ocb_done(ocb, ct, ctlen, pt, tagbuf, &tagbuflen, 1)) != CRYPT_OK) { |
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55 goto LBL_ERR; |
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56 } |
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57 |
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58 if (taglen <= tagbuflen && XMEM_NEQ(tagbuf, tag, taglen) == 0) { |
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59 *stat = 1; |
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60 } |
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61 |
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62 err = CRYPT_OK; |
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63 LBL_ERR: |
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64 #ifdef LTC_CLEAN_STACK |
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65 zeromem(tagbuf, MAXBLOCKSIZE); |
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66 #endif |
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67 |
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68 XFREE(tagbuf); |
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69 |
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70 return err; |
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71 } |
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72 |
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73 #endif |
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74 |
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75 |
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76 /* ref: $Format:%D$ */ |
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77 /* git commit: $Format:%H$ */ |
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78 /* commit time: $Format:%ai$ */ |