Mercurial > dropbear

annotate libtomcrypt/src/encauth/ocb/ocb_encrypt.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
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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10 /**
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11 @file ocb_encrypt.c
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12 OCB implementation, encrypt 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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f849a5ca2efc update to libtomcrypt 1.17 (with Dropbear changes)
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16 #ifdef LTC_OCB_MODE
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18 /**
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19 Encrypt a block of data with OCB.
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20 @param ocb The OCB state
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21 @param pt The plaintext (length of the block size of the block cipher)
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22 @param ct [out] The ciphertext (same size as the pt)
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23 @return CRYPT_OK if successful
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24 */
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25 int ocb_encrypt(ocb_state *ocb, const unsigned char *pt, unsigned char *ct)
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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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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 if ((err = cipher_is_valid(ocb->cipher)) != CRYPT_OK) {
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34 return err;
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35 }
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36 if (ocb->block_len != cipher_descriptor[ocb->cipher].block_length) {
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37 return CRYPT_INVALID_ARG;
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38 }
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39
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40 /* compute checksum */
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41 for (x = 0; x < ocb->block_len; x++) {
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42 ocb->checksum[x] ^= pt[x];
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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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48 /* xor pt 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] = pt[x] ^ Z[x];
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51 }
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52 if ((err = cipher_descriptor[ocb->cipher].ecb_encrypt(tmp, ct, &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 ct[x] ^= Z[x];
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57 }
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59 #ifdef LTC_CLEAN_STACK
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60 zeromem(Z, sizeof(Z));
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61 zeromem(tmp, sizeof(tmp));
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62 #endif
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63 return CRYPT_OK;
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64 }
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66 #endif
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67
1471
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68 /* ref: $Format:%D$ */
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69 /* git commit: $Format:%H$ */
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70 /* commit time: $Format:%ai$ */