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annotate libtomcrypt/src/encauth/chachapoly/chacha20poly1305_setiv.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
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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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10 #include "tomcrypt.h"
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11
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12 #ifdef LTC_CHACHA20POLY1305_MODE
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13
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14 /**
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15 Set IV + counter data to the ChaCha20Poly1305 state and reset the context
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16 @param st The ChaCha20Poly1305 state
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17 @param iv The IV data to add
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18 @param ivlen The length of the IV (must be 12 or 8)
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19 @return CRYPT_OK on success
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20 */
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21 int chacha20poly1305_setiv(chacha20poly1305_state *st, const unsigned char *iv, unsigned long ivlen)
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22 {
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23 chacha_state tmp_st;
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24 int i, err;
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25 unsigned char polykey[32];
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26
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27 LTC_ARGCHK(st != NULL);
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28 LTC_ARGCHK(iv != NULL);
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29 LTC_ARGCHK(ivlen == 12 || ivlen == 8);
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30
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31 /* set IV for chacha20 */
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32 if (ivlen == 12) {
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33 /* IV 96bit */
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34 if ((err = chacha_ivctr32(&st->chacha, iv, ivlen, 1)) != CRYPT_OK) return err;
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35 }
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36 else {
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37 /* IV 64bit */
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38 if ((err = chacha_ivctr64(&st->chacha, iv, ivlen, 1)) != CRYPT_OK) return err;
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39 }
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40
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41 /* copy chacha20 key to temporary state */
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42 for(i = 0; i < 12; i++) tmp_st.input[i] = st->chacha.input[i];
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43 tmp_st.rounds = 20;
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44 /* set IV */
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45 if (ivlen == 12) {
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46 /* IV 32bit */
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47 if ((err = chacha_ivctr32(&tmp_st, iv, ivlen, 0)) != CRYPT_OK) return err;
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48 }
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49 else {
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50 /* IV 64bit */
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51 if ((err = chacha_ivctr64(&tmp_st, iv, ivlen, 0)) != CRYPT_OK) return err;
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52 }
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53 /* (re)generate new poly1305 key */
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54 if ((err = chacha_keystream(&tmp_st, polykey, 32)) != CRYPT_OK) return err;
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55 /* (re)initialise poly1305 */
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56 if ((err = poly1305_init(&st->poly, polykey, 32)) != CRYPT_OK) return err;
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57 st->ctlen = 0;
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58 st->aadlen = 0;
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59 st->aadflg = 1;
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60
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61 return CRYPT_OK;
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62 }
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63
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64 #endif
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65
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66 /* ref: $Format:%D$ */
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67 /* git commit: $Format:%H$ */
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68 /* commit time: $Format:%ai$ */