Mercurial > dropbear

annotate libtomcrypt/src/encauth/ccm/ccm_init.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
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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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 #include "tomcrypt.h"
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10
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11 #ifdef LTC_CCM_MODE
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12
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13 /**
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14 Initialize a CCM state
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15 @param ccm The CCM state to initialize
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16 @param cipher The index of the cipher to use
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17 @param key The secret key
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18 @param keylen The length of the secret key
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19 @param ptlen The length of the plain/cipher text that will be processed
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20 @param taglen The max length of the MAC tag
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21 @param aadlen The length of the AAD
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22
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23 @return CRYPT_OK on success
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24 */
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25 int ccm_init(ccm_state *ccm, int cipher,
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26 const unsigned char *key, int keylen, int ptlen, int taglen, int aadlen)
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27 {
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28 int err;
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29
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30 LTC_ARGCHK(ccm != NULL);
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31 LTC_ARGCHK(key != NULL);
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32 LTC_ARGCHK(taglen != 0);
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33
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34 XMEMSET(ccm, 0, sizeof(ccm_state));
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35
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36 /* check cipher input */
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37 if ((err = cipher_is_valid(cipher)) != CRYPT_OK) {
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38 return err;
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39 }
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40 if (cipher_descriptor[cipher].block_length != 16) {
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41 return CRYPT_INVALID_CIPHER;
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42 }
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43
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44 /* make sure the taglen is even and <= 16 */
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45 ccm->taglen = taglen;
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46 ccm->taglen &= ~1;
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47 if (ccm->taglen > 16) {
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48 ccm->taglen = 16;
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49 }
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50
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51 /* can't use < 4 */
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52 if (ccm->taglen < 4) {
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53 return CRYPT_INVALID_ARG;
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54 }
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55
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56 /* schedule key */
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57 if ((err = cipher_descriptor[cipher].setup(key, keylen, 0, &ccm->K)) != CRYPT_OK) {
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58 return err;
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59 }
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60 ccm->cipher = cipher;
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61
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62 /* let's get the L value */
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63 ccm->ptlen = ptlen;
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64 ccm->L = 0;
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65 while (ptlen) {
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66 ++ccm->L;
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67 ptlen >>= 8;
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68 }
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69 if (ccm->L <= 1) {
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70 ccm->L = 2;
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71 }
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72
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73 ccm->aadlen = aadlen;
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74 return CRYPT_OK;
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75 }
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76
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77 #endif
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78
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79 /* ref: $Format:%D$ */
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80 /* git commit: $Format:%H$ */
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81 /* commit time: $Format:%ai$ */