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comparison ctr_start.c @ 3:7faae8f46238 libtomcrypt-orig

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Branch renaming
author Matt Johnston <matt@ucc.asn.au>
date Mon, 31 May 2004 18:25:41 +0000
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-1:000000000000 3:7faae8f46238
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 "mycrypt.h"
12
13 #ifdef CTR
14
15 int ctr_start(int cipher, const unsigned char *count, const unsigned char *key, int keylen,
16 int num_rounds, symmetric_CTR *ctr)
17 {
18 int x, err;
19
20 _ARGCHK(count != NULL);
21 _ARGCHK(key != NULL);
22 _ARGCHK(ctr != NULL);
23
24 /* bad param? */
25 if ((err = cipher_is_valid(cipher)) != CRYPT_OK) {
26 return err;
27 }
28
29 /* setup cipher */
30 if ((err = cipher_descriptor[cipher].setup(key, keylen, num_rounds, &ctr->key)) != CRYPT_OK) {
31 return err;
32 }
33
34 /* copy ctr */
35 ctr->blocklen = cipher_descriptor[cipher].block_length;
36 ctr->cipher = cipher;
37 ctr->padlen = 0;
38 ctr->mode = 0;
39 for (x = 0; x < ctr->blocklen; x++) {
40 ctr->ctr[x] = count[x];
41 }
42 cipher_descriptor[ctr->cipher].ecb_encrypt(ctr->ctr, ctr->pad, &ctr->key);
43 return CRYPT_OK;
44 }
45
46 #endif