Mercurial > dropbear
comparison libtomcrypt/src/encauth/eax/eax_decrypt.c @ 399:a707e6148060
merge of '5fdf69ca60d1683cdd9f4c2595134bed26394834'
and '6b61c50f4cf888bea302ac8fcf5dbb573b443251'
| author | Matt Johnston <matt@ucc.asn.au> |
|---|---|
| date | Sat, 03 Feb 2007 08:20:34 +0000 |
| parents | 0cbe8f6dbf9e |
| children | f849a5ca2efc |
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| 394:17d097fc111c | 399:a707e6148060 |
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| 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.com | |
| 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: 1.4 $ */ | |
| 50 /* $Date: 2006/03/31 14:15:35 $ */ |