Mercurial > dropbear

comparison libtomcrypt/src/modes/cfb/cfb_encrypt.c @ 297:79bf1023cf11 agent-client

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propagate from branch 'au.asn.ucc.matt.dropbear' (head 0501e6f661b5415eb76f3b312d183c3adfbfb712) to branch 'au.asn.ucc.matt.dropbear.cli-agent' (head 01038174ec27245b51bd43a66c01ad930880f67b)
author Matt Johnston <matt@ucc.asn.au>
date Tue, 21 Mar 2006 16:20:59 +0000
parents 1b9e69c058d2
children 0cbe8f6dbf9e
comparison
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225:ca7e76d981d9 297:79bf1023cf11
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 #include "tomcrypt.h"
12
13 /**
14 @file cfb_encrypt.c
15 CFB implementation, encrypt data, Tom St Denis
16 */
17
18 #ifdef CFB
19
20 /**
21 CFB encrypt
22 @param pt Plaintext
23 @param ct [out] Ciphertext
24 @param len Length of plaintext (octets)
25 @param cfb CFB state
26 @return CRYPT_OK if successful
27 */
28 int cfb_encrypt(const unsigned char *pt, unsigned char *ct, unsigned long len, symmetric_CFB *cfb)
29 {
30 int err;
31
32 LTC_ARGCHK(pt != NULL);
33 LTC_ARGCHK(ct != NULL);
34 LTC_ARGCHK(cfb != NULL);
35
36 if ((err = cipher_is_valid(cfb->cipher)) != CRYPT_OK) {
37 return err;
38 }
39
40 /* is blocklen/padlen valid? */
41 if (cfb->blocklen < 0 || cfb->blocklen > (int)sizeof(cfb->IV) ||
42 cfb->padlen < 0 || cfb->padlen > (int)sizeof(cfb->pad)) {
43 return CRYPT_INVALID_ARG;
44 }
45
46 while (len-- > 0) {
47 if (cfb->padlen == cfb->blocklen) {
48 cipher_descriptor[cfb->cipher].ecb_encrypt(cfb->pad, cfb->IV, &cfb->key);
49 cfb->padlen = 0;
50 }
51 cfb->pad[cfb->padlen] = (*ct = *pt ^ cfb->IV[cfb->padlen]);
52 ++pt;
53 ++ct;
54 ++cfb->padlen;
55 }
56 return CRYPT_OK;
57 }
58
59 #endif
60
61 /* $Source: /cvs/libtom/libtomcrypt/src/modes/cfb/cfb_encrypt.c,v $ */
62 /* $Revision: 1.3 $ */
63 /* $Date: 2005/05/05 14:35:59 $ */