annotate cfb_setiv.c @ 164:cd1143579f00 libtomcrypt LTC_DB_0.44

mpi.c isn't needed if we're using libtommath seperately
author Matt Johnston <matt@ucc.asn.au>
date Sun, 02 Jan 2005 17:19:46 +0000
parents 6362d3854bb4
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
15
6362d3854bb4 0.96 release of LibTomCrypt
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
6362d3854bb4 0.96 release of LibTomCrypt
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
2 *
6362d3854bb4 0.96 release of LibTomCrypt
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
3 * LibTomCrypt is a library that provides various cryptographic
6362d3854bb4 0.96 release of LibTomCrypt
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
4 * algorithms in a highly modular and flexible manner.
6362d3854bb4 0.96 release of LibTomCrypt
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
5 *
6362d3854bb4 0.96 release of LibTomCrypt
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
6 * The library is free for all purposes without any express
6362d3854bb4 0.96 release of LibTomCrypt
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
7 * guarantee it works.
6362d3854bb4 0.96 release of LibTomCrypt
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
8 *
6362d3854bb4 0.96 release of LibTomCrypt
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
9 * Tom St Denis, [email protected], http://libtomcrypt.org
6362d3854bb4 0.96 release of LibTomCrypt
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
10 */
6362d3854bb4 0.96 release of LibTomCrypt
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
11
6362d3854bb4 0.96 release of LibTomCrypt
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
12 #include "mycrypt.h"
6362d3854bb4 0.96 release of LibTomCrypt
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
13
6362d3854bb4 0.96 release of LibTomCrypt
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
14 #ifdef CFB
6362d3854bb4 0.96 release of LibTomCrypt
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
15
6362d3854bb4 0.96 release of LibTomCrypt
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
16 int cfb_setiv(const unsigned char *IV, unsigned long len, symmetric_CFB *cfb)
6362d3854bb4 0.96 release of LibTomCrypt
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
17 {
6362d3854bb4 0.96 release of LibTomCrypt
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
18 int err;
6362d3854bb4 0.96 release of LibTomCrypt
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
19
6362d3854bb4 0.96 release of LibTomCrypt
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
20 _ARGCHK(IV != NULL);
6362d3854bb4 0.96 release of LibTomCrypt
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
21 _ARGCHK(cfb != NULL);
6362d3854bb4 0.96 release of LibTomCrypt
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
22
6362d3854bb4 0.96 release of LibTomCrypt
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
23 if ((err = cipher_is_valid(cfb->cipher)) != CRYPT_OK) {
6362d3854bb4 0.96 release of LibTomCrypt
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
24 return err;
6362d3854bb4 0.96 release of LibTomCrypt
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
25 }
6362d3854bb4 0.96 release of LibTomCrypt
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
26
6362d3854bb4 0.96 release of LibTomCrypt
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
27 if (len != (unsigned long)cfb->blocklen) {
6362d3854bb4 0.96 release of LibTomCrypt
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
28 return CRYPT_INVALID_ARG;
6362d3854bb4 0.96 release of LibTomCrypt
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
29 }
6362d3854bb4 0.96 release of LibTomCrypt
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
30
6362d3854bb4 0.96 release of LibTomCrypt
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
31 /* force next block */
6362d3854bb4 0.96 release of LibTomCrypt
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
32 cfb->padlen = 0;
6362d3854bb4 0.96 release of LibTomCrypt
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
33 cipher_descriptor[cfb->cipher].ecb_encrypt(IV, cfb->IV, &cfb->key);
6362d3854bb4 0.96 release of LibTomCrypt
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
34
6362d3854bb4 0.96 release of LibTomCrypt
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
35 return CRYPT_OK;
6362d3854bb4 0.96 release of LibTomCrypt
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
36 }
6362d3854bb4 0.96 release of LibTomCrypt
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
37
6362d3854bb4 0.96 release of LibTomCrypt
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
38 #endif
6362d3854bb4 0.96 release of LibTomCrypt
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
39