Mercurial > dropbear

annotate libtomcrypt/src/encauth/ocb/ocb_done_decrypt.c @ 1156:a8f4dade70e5

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avoid getpass when not used some systems (like android's bionic) do not provide getpass. you can disable ENABLE_CLI_PASSWORD_AUTH & ENABLE_CLI_INTERACT_AUTH to avoid its use (and rely on pubkey auth), but the link still fails because the support file calls getpass. do not define this func if both of those auth methods are not used.
author Mike Frysinger <vapier@gentoo.org>
date Wed, 21 Oct 2015 22:39:55 +0800
parents 0cbe8f6dbf9e
children f849a5ca2efc
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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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75 #endif
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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 $ */