Mercurial > dropbear
annotate libtomcrypt/src/encauth/ocb/ocb_done_decrypt.c @ 712:bf0ac0512ef7
Fix "-m none" case and ugly typo
author | Matt Johnston <matt@ucc.asn.au> |
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date | Wed, 20 Mar 2013 23:13:45 +0800 |
parents | 0cbe8f6dbf9e |
children | f849a5ca2efc |
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 * Tom St Denis, [email protected], http://libtomcrypt.com |
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10 */ |
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11 |
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12 /** |
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13 @file ocb_done_decrypt.c |
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14 OCB implementation, terminate decryption, by Tom St Denis |
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15 */ |
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16 #include "tomcrypt.h" |
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17 |
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18 #ifdef OCB_MODE |
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19 |
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20 /** |
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21 Terminate a decrypting OCB state |
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22 @param ocb The OCB state |
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23 @param ct The ciphertext (if any) |
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24 @param ctlen The length of the ciphertext (octets) |
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25 @param pt [out] The plaintext |
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26 @param tag The authentication tag (to compare against) |
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27 @param taglen The length of the authentication tag provided |
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28 @param stat [out] The result of the tag comparison |
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29 @return CRYPT_OK if the process was successful regardless if the tag is valid |
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30 */ |
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31 int ocb_done_decrypt(ocb_state *ocb, |
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32 const unsigned char *ct, unsigned long ctlen, |
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33 unsigned char *pt, |
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34 const unsigned char *tag, unsigned long taglen, int *stat) |
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35 { |
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36 int err; |
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37 unsigned char *tagbuf; |
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38 unsigned long tagbuflen; |
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39 |
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40 LTC_ARGCHK(ocb != NULL); |
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41 LTC_ARGCHK(pt != NULL); |
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42 LTC_ARGCHK(ct != NULL); |
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43 LTC_ARGCHK(tag != NULL); |
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44 LTC_ARGCHK(stat != NULL); |
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45 |
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46 /* default to failed */ |
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47 *stat = 0; |
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48 |
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49 /* allocate memory */ |
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50 tagbuf = XMALLOC(MAXBLOCKSIZE); |
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51 if (tagbuf == NULL) { |
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52 return CRYPT_MEM; |
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53 } |
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54 |
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55 tagbuflen = MAXBLOCKSIZE; |
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56 if ((err = s_ocb_done(ocb, ct, ctlen, pt, tagbuf, &tagbuflen, 1)) != CRYPT_OK) { |
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57 goto LBL_ERR; |
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58 } |
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59 |
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60 if (taglen <= tagbuflen && XMEMCMP(tagbuf, tag, taglen) == 0) { |
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61 *stat = 1; |
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62 } |
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63 |
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64 err = CRYPT_OK; |
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65 LBL_ERR: |
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66 #ifdef LTC_CLEAN_STACK |
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67 zeromem(tagbuf, MAXBLOCKSIZE); |
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68 #endif |
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69 |
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70 XFREE(tagbuf); |
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71 |
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72 return err; |
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73 } |
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74 |
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75 #endif |
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76 |
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77 |
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78 /* $Source: /cvs/libtom/libtomcrypt/src/encauth/ocb/ocb_done_decrypt.c,v $ */ |
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79 /* $Revision: 1.5 $ */ |
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80 /* $Date: 2006/11/01 09:28:17 $ */ |