Mercurial > dropbear

annotate libtomcrypt/src/encauth/ocb/ocb_done_decrypt.c @ 1629:258b57b208ae

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Fix for issue successfull login of disabled user (#78) This commit introduces fix for scenario: 1. Root login disabled on dropbear 2. PAM authentication model enabled While login as root user, after prompt for password user is being notified about login failrue, but after second attempt of prompt for password within same session, login becames succesfull. Signed-off-by: Pawel Rapkiewicz <[email protected]>
author vincentto13 <33652988+vincentto13@users.noreply.github.com>
date Wed, 20 Mar 2019 15:03:40 +0100
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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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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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: $Format:%ai$ */