Mercurial > dropbear

comparison src/modes/cfb/cfb_decrypt.c @ 381:999a5eb4ed10 libtomcrypt-dropbear

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propagate from branch 'au.asn.ucc.matt.ltc.orig' (head 52840647ac7f5c707c3bd158d119a15734a7ef28) to branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
author Matt Johnston <matt@ucc.asn.au>
date Thu, 11 Jan 2007 02:39:21 +0000
parents d5faf4814ddb
children
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281:997e6f7dc01e 381:999a5eb4ed10
4 * algorithms in a highly modular and flexible manner. 4 * algorithms in a highly modular and flexible manner.
5 * 5 *
6 * The library is free for all purposes without any express 6 * The library is free for all purposes without any express
7 * guarantee it works. 7 * guarantee it works.
8 * 8 *
9 * Tom St Denis, [email protected], http://libtomcrypt.org 9 * Tom St Denis, [email protected], http://libtomcrypt.com
10 */ 10 */
11 #include "tomcrypt.h" 11 #include "tomcrypt.h"
12 12
13 /** 13 /**
14 @file cfb_decrypt.c 14 @file cfb_decrypt.c
15 CFB implementation, decrypt data, Tom St Denis 15 CFB implementation, decrypt data, Tom St Denis
16 */ 16 */
17 17
18 #ifdef CFB 18 #ifdef LTC_CFB_MODE
19 19
20 /** 20 /**
21 CFB decrypt 21 CFB decrypt
22 @param ct Ciphertext 22 @param ct Ciphertext
23 @param pt [out] Plaintext 23 @param pt [out] Plaintext
43 return CRYPT_INVALID_ARG; 43 return CRYPT_INVALID_ARG;
44 } 44 }
45 45
46 while (len-- > 0) { 46 while (len-- > 0) {
47 if (cfb->padlen == cfb->blocklen) { 47 if (cfb->padlen == cfb->blocklen) {
48 cipher_descriptor[cfb->cipher].ecb_encrypt(cfb->pad, cfb->IV, &cfb->key); 48 if ((err = cipher_descriptor[cfb->cipher].ecb_encrypt(cfb->pad, cfb->IV, &cfb->key)) != CRYPT_OK) {
49 return err;
50 }
49 cfb->padlen = 0; 51 cfb->padlen = 0;
50 } 52 }
51 cfb->pad[cfb->padlen] = *ct; 53 cfb->pad[cfb->padlen] = *ct;
52 *pt = *ct ^ cfb->IV[cfb->padlen]; 54 *pt = *ct ^ cfb->IV[cfb->padlen];
53 ++pt; 55 ++pt;
54 ++ct; 56 ++ct;
55 ++cfb->padlen; 57 ++(cfb->padlen);
56 } 58 }
57 return CRYPT_OK; 59 return CRYPT_OK;
58 } 60 }
59 61
60 #endif 62 #endif
61 63
62 64
63 /* $Source: /cvs/libtom/libtomcrypt/src/modes/cfb/cfb_decrypt.c,v $ */ 65 /* $Source: /cvs/libtom/libtomcrypt/src/modes/cfb/cfb_decrypt.c,v $ */
64 /* $Revision: 1.3 $ */ 66 /* $Revision: 1.7 $ */
65 /* $Date: 2005/05/05 14:35:59 $ */ 67 /* $Date: 2006/11/26 01:45:14 $ */