Mercurial > dropbear
annotate libtomcrypt/src/encauth/chachapoly/chacha20poly1305_setiv.c @ 1892:3442105b2aba
increase verboseness by allowing multiple -v
author | HansH111 <hans@atbas.org> |
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date | Sat, 19 Mar 2022 08:55:31 +0000 |
parents | 6dba84798cd5 |
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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: $Format:%ai$ */ |