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comparison libtomcrypt/src/encauth/eax/eax_decrypt.c @ 285:1b9e69c058d2

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propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3) to branch 'au.asn.ucc.matt.dropbear' (head fdf4a7a3b97ae5046139915de7e40399cceb2c01)
author Matt Johnston <matt@ucc.asn.au>
date Wed, 08 Mar 2006 13:23:58 +0000
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281:997e6f7dc01e 285:1b9e69c058d2
1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
2 *
3 * LibTomCrypt is a library that provides various cryptographic
4 * algorithms in a highly modular and flexible manner.
5 *
6 * The library is free for all purposes without any express
7 * guarantee it works.
8 *
9 * Tom St Denis, [email protected], http://libtomcrypt.org
10 */
11
12 /**
13 @file eax_decrypt.c
14 EAX implementation, decrypt block, by Tom St Denis
15 */
16 #include "tomcrypt.h"
17
18 #ifdef EAX_MODE
19
20 /**
21 Decrypt data with the EAX protocol
22 @param eax The EAX state
23 @param ct The ciphertext
24 @param pt [out] The plaintext
25 @param length The length (octets) of the ciphertext
26 @return CRYPT_OK if successful
27 */
28 int eax_decrypt(eax_state *eax, const unsigned char *ct, unsigned char *pt,
29 unsigned long length)
30 {
31 int err;
32
33 LTC_ARGCHK(eax != NULL);
34 LTC_ARGCHK(pt != NULL);
35 LTC_ARGCHK(ct != NULL);
36
37 /* omac ciphertext */
38 if ((err = omac_process(&eax->ctomac, ct, length)) != CRYPT_OK) {
39 return err;
40 }
41
42 /* decrypt */
43 return ctr_decrypt(ct, pt, length, &eax->ctr);
44 }
45
46 #endif
47
48 /* $Source: /cvs/libtom/libtomcrypt/src/encauth/eax/eax_decrypt.c,v $ */
49 /* $Revision: 1.3 $ */
50 /* $Date: 2005/05/05 14:35:58 $ */