Mercurial > dropbear

annotate libtomcrypt/src/encauth/ocb/ocb_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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10 /**
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11 @file ocb_decrypt.c
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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12 OCB implementation, decrypt data, 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 Decrypt a block with OCB.
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20 @param ocb The OCB state
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21 @param ct The ciphertext (length of the block size of the block cipher)
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22 @param pt [out] The plaintext (length of ct)
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23 @return CRYPT_OK if successful
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24 */
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25 int ocb_decrypt(ocb_state *ocb, const unsigned char *ct, unsigned char *pt)
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26 {
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27 unsigned char Z[MAXBLOCKSIZE], tmp[MAXBLOCKSIZE];
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28 int err, x;
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29
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30 LTC_ARGCHK(ocb != NULL);
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31 LTC_ARGCHK(pt != NULL);
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32 LTC_ARGCHK(ct != NULL);
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33
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34 /* check if valid cipher */
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35 if ((err = cipher_is_valid(ocb->cipher)) != CRYPT_OK) {
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36 return err;
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37 }
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38 LTC_ARGCHK(cipher_descriptor[ocb->cipher].ecb_decrypt != NULL);
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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39
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40 /* check length */
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41 if (ocb->block_len != cipher_descriptor[ocb->cipher].block_length) {
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42 return CRYPT_INVALID_ARG;
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43 }
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45 /* Get Z[i] value */
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46 ocb_shift_xor(ocb, Z);
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47
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48 /* xor ct in, encrypt, xor Z out */
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49 for (x = 0; x < ocb->block_len; x++) {
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50 tmp[x] = ct[x] ^ Z[x];
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51 }
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52 if ((err = cipher_descriptor[ocb->cipher].ecb_decrypt(tmp, pt, &ocb->key)) != CRYPT_OK) {
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53 return err;
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54 }
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55 for (x = 0; x < ocb->block_len; x++) {
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56 pt[x] ^= Z[x];
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57 }
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58
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59 /* compute checksum */
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60 for (x = 0; x < ocb->block_len; x++) {
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61 ocb->checksum[x] ^= pt[x];
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62 }
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63
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64
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65 #ifdef LTC_CLEAN_STACK
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66 zeromem(Z, sizeof(Z));
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67 zeromem(tmp, sizeof(tmp));
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68 #endif
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69 return CRYPT_OK;
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70 }
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72 #endif
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74
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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75 /* ref: $Format:%D$ */
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76 /* git commit: $Format:%H$ */
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77 /* commit time: $Format:%ai$ */