Mercurial > dropbear

annotate libtomcrypt/src/encauth/eax/eax_decrypt.c @ 1759:4c5599435084

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merge from main
author Matt Johnston <matt@ucc.asn.au>
date Sun, 25 Oct 2020 21:47:42 +0800
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
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10 /**
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11 @file eax_decrypt.c
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12 EAX implementation, decrypt block, 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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16 #ifdef LTC_EAX_MODE
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18 /**
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19 Decrypt data with the EAX protocol
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20 @param eax The EAX state
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21 @param ct The ciphertext
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22 @param pt [out] The plaintext
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23 @param length The length (octets) of the ciphertext
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24 @return CRYPT_OK if successful
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25 */
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26 int eax_decrypt(eax_state *eax, const unsigned char *ct, unsigned char *pt,
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27 unsigned long length)
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28 {
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29 int err;
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31 LTC_ARGCHK(eax != NULL);
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32 LTC_ARGCHK(pt != NULL);
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33 LTC_ARGCHK(ct != NULL);
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35 /* omac ciphertext */
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36 if ((err = omac_process(&eax->ctomac, ct, length)) != CRYPT_OK) {
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37 return err;
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38 }
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40 /* decrypt */
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41 return ctr_decrypt(ct, pt, length, &eax->ctr);
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42 }
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44 #endif
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46 /* ref: $Format:%D$ */
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47 /* git commit: $Format:%H$ */
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48 /* commit time: $Format:%ai$ */