Mercurial > dropbear
annotate libtomcrypt/src/encauth/chachapoly/chacha20poly1305_decrypt.c @ 1551:1acbdf64088e
add guard HAVE_GETGROUPLIST
author | Matt Johnston <matt@ucc.asn.au> |
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date | Tue, 27 Feb 2018 21:49:10 +0800 |
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 Decrypt bytes of ciphertext with ChaCha20Poly1305 |
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16 @param st The ChaCha20Poly1305 state |
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17 @param in The ciphertext |
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18 @param inlen The length of the input (octets) |
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19 @param out [out] The plaintext (length inlen) |
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20 @return CRYPT_OK if successful |
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21 */ |
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22 int chacha20poly1305_decrypt(chacha20poly1305_state *st, const unsigned char *in, unsigned long inlen, unsigned char *out) |
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23 { |
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24 unsigned char padzero[16] = { 0 }; |
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25 unsigned long padlen; |
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26 int err; |
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27 |
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28 if (inlen == 0) return CRYPT_OK; /* nothing to do */ |
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29 LTC_ARGCHK(st != NULL); |
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30 |
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31 if (st->aadflg) { |
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32 padlen = 16 - (unsigned long)(st->aadlen % 16); |
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33 if (padlen < 16) { |
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34 if ((err = poly1305_process(&st->poly, padzero, padlen)) != CRYPT_OK) return err; |
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35 } |
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36 st->aadflg = 0; /* no more AAD */ |
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37 } |
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38 if (st->aadflg) st->aadflg = 0; /* no more AAD */ |
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39 if ((err = poly1305_process(&st->poly, in, inlen)) != CRYPT_OK) return err; |
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40 if ((err = chacha_crypt(&st->chacha, in, inlen, out)) != CRYPT_OK) return err; |
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41 st->ctlen += (ulong64)inlen; |
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42 return CRYPT_OK; |
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43 } |
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44 |
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45 #endif |
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46 |
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47 /* ref: $Format:%D$ */ |
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48 /* git commit: $Format:%H$ */ |
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49 /* commit time: $Format:%ai$ */ |