|
3
|
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 CBC |
|
|
14 |
|
|
15 int cbc_start(int cipher, const unsigned char *IV, const unsigned char *key, |
|
|
16 int keylen, int num_rounds, symmetric_CBC *cbc) |
|
|
17 { |
|
|
18 int x, err; |
|
|
19 |
|
|
20 _ARGCHK(IV != NULL); |
|
|
21 _ARGCHK(key != NULL); |
|
|
22 _ARGCHK(cbc != 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, &cbc->key)) != CRYPT_OK) { |
|
|
31 return err; |
|
|
32 } |
|
|
33 |
|
|
34 /* copy IV */ |
|
|
35 cbc->blocklen = cipher_descriptor[cipher].block_length; |
|
|
36 cbc->cipher = cipher; |
|
|
37 for (x = 0; x < cbc->blocklen; x++) { |
|
|
38 cbc->IV[x] = IV[x]; |
|
|
39 } |
|
|
40 return CRYPT_OK; |
|
|
41 } |
|
|
42 |
|
|
43 #endif |
