Mercurial > dropbear

annotate libtomcrypt/src/encauth/ocb/ocb_done_decrypt.c @ 1680:5e763ad6e2e0

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author Matt Johnston <matt@ucc.asn.au>
date Sun, 24 May 2020 13:34:19 +0800
parents 6dba84798cd5
children
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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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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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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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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 */
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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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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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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44 /* default to failed */
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45 *stat = 0;
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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
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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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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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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68 XFREE(tagbuf);
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70 return err;
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71 }
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73 #endif
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75
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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76 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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77 /* git commit: $Format:%H$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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78 /* commit time: $Format:%ai$ */