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comparison libtomcrypt/src/mac/f9/f9_process.c @ 382:0cbe8f6dbf9e

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propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f) to branch 'au.asn.ucc.matt.dropbear' (head 02c413252c90e9de8e03d91e9939dde3029f5c0a)
author Matt Johnston <matt@ucc.asn.au>
date Thu, 11 Jan 2007 02:41:05 +0000
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children f849a5ca2efc
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379:b66a00272a90 382:0cbe8f6dbf9e
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 #include "tomcrypt.h"
12
13 /**
14 @file f9_process.c
15 f9 Support, process blocks with f9
16 */
17
18 #ifdef LTC_F9_MODE
19
20 /** Process data through f9-MAC
21 @param f9 The f9-MAC state
22 @param in Input data to process
23 @param inlen Length of input in octets
24 Return CRYPT_OK on success
25 */
26 int f9_process(f9_state *f9, const unsigned char *in, unsigned long inlen)
27 {
28 int err, x;
29
30 LTC_ARGCHK(f9 != NULL);
31 LTC_ARGCHK(in != NULL);
32
33 /* check structure */
34 if ((err = cipher_is_valid(f9->cipher)) != CRYPT_OK) {
35 return err;
36 }
37
38 if ((f9->blocksize > cipher_descriptor[f9->cipher].block_length) || (f9->blocksize < 0) ||
39 (f9->buflen > f9->blocksize) || (f9->buflen < 0)) {
40 return CRYPT_INVALID_ARG;
41 }
42
43 #ifdef LTC_FAST
44 if (f9->buflen == 0) {
45 while (inlen >= (unsigned long)f9->blocksize) {
46 for (x = 0; x < f9->blocksize; x += sizeof(LTC_FAST_TYPE)) {
47 *((LTC_FAST_TYPE*)&(f9->IV[x])) ^= *((LTC_FAST_TYPE*)&(in[x]));
48 }
49 cipher_descriptor[f9->cipher].ecb_encrypt(f9->IV, f9->IV, &f9->key);
50 for (x = 0; x < f9->blocksize; x += sizeof(LTC_FAST_TYPE)) {
51 *((LTC_FAST_TYPE*)&(f9->ACC[x])) ^= *((LTC_FAST_TYPE*)&(f9->IV[x]));
52 }
53 in += f9->blocksize;
54 inlen -= f9->blocksize;
55 }
56 }
57 #endif
58
59 while (inlen) {
60 if (f9->buflen == f9->blocksize) {
61 cipher_descriptor[f9->cipher].ecb_encrypt(f9->IV, f9->IV, &f9->key);
62 for (x = 0; x < f9->blocksize; x++) {
63 f9->ACC[x] ^= f9->IV[x];
64 }
65 f9->buflen = 0;
66 }
67 f9->IV[f9->buflen++] ^= *in++;
68 --inlen;
69 }
70 return CRYPT_OK;
71 }
72
73 #endif
74
75 /* $Source: /cvs/libtom/libtomcrypt/src/mac/f9/f9_process.c,v $ */
76 /* $Revision: 1.3 $ */
77 /* $Date: 2006/12/16 17:41:21 $ */
78