Mercurial > dropbear
annotate src/modes/cbc/cbc_encrypt.c @ 230:809b681a9af5 libtomcrypt
- check for generic AES/TWOFISH settings from Dropbear, not AES128 etc
author | Matt Johnston <matt@ucc.asn.au> |
---|---|
date | Tue, 30 Aug 2005 17:40:30 +0000 |
parents | 39d5d58461d6 |
children |
rev | line source |
---|---|
191
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
2 * |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
3 * LibTomCrypt is a library that provides various cryptographic |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
4 * algorithms in a highly modular and flexible manner. |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
5 * |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
6 * The library is free for all purposes without any express |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
7 * guarantee it works. |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
8 * |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
9 * Tom St Denis, [email protected], http://libtomcrypt.org |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
10 */ |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
11 #include "tomcrypt.h" |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
12 |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
13 /** |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
14 @file cbc_encrypt.c |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
15 CBC implementation, encrypt block, Tom St Denis |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
16 */ |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
17 |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
18 |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
19 #ifdef CBC |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
20 |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
21 /** |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
22 CBC encrypt |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
23 @param pt Plaintext |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
24 @param ct [out] Ciphertext |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
25 @param len The number of bytes to process (must be multiple of block length) |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
26 @param cbc CBC state |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
27 @return CRYPT_OK if successful |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
28 */ |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
29 int cbc_encrypt(const unsigned char *pt, unsigned char *ct, unsigned long len, symmetric_CBC *cbc) |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
30 { |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
31 int x, err; |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
32 |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
33 LTC_ARGCHK(pt != NULL); |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
34 LTC_ARGCHK(ct != NULL); |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
35 LTC_ARGCHK(cbc != NULL); |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
36 |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
37 if ((err = cipher_is_valid(cbc->cipher)) != CRYPT_OK) { |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
38 return err; |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
39 } |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
40 |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
41 /* is blocklen valid? */ |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
42 if (cbc->blocklen < 0 || cbc->blocklen > (int)sizeof(cbc->IV)) { |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
43 return CRYPT_INVALID_ARG; |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
44 } |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
45 |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
46 if (len % cbc->blocklen) { |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
47 return CRYPT_INVALID_ARG; |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
48 } |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
49 #ifdef LTC_FAST |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
50 if (len % sizeof(LTC_FAST_TYPE)) { |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
51 return CRYPT_INVALID_ARG; |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
52 } |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
53 #endif |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
54 |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
55 if (cipher_descriptor[cbc->cipher].accel_cbc_encrypt != NULL) { |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
56 cipher_descriptor[cbc->cipher].accel_cbc_encrypt(pt, ct, len / cbc->blocklen, cbc->IV, &cbc->key); |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
57 } else { |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
58 while (len) { |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
59 /* xor IV against plaintext */ |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
60 #if defined(LTC_FAST) |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
61 for (x = 0; x < cbc->blocklen; x += sizeof(LTC_FAST_TYPE)) { |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
62 *((LTC_FAST_TYPE*)((unsigned char *)cbc->IV + x)) ^= *((LTC_FAST_TYPE*)((unsigned char *)pt + x)); |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
63 } |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
64 #else |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
65 for (x = 0; x < cbc->blocklen; x++) { |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
66 cbc->IV[x] ^= pt[x]; |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
67 } |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
68 #endif |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
69 |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
70 /* encrypt */ |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
71 cipher_descriptor[cbc->cipher].ecb_encrypt(cbc->IV, ct, &cbc->key); |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
72 |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
73 /* store IV [ciphertext] for a future block */ |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
74 #if defined(LTC_FAST) |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
75 for (x = 0; x < cbc->blocklen; x += sizeof(LTC_FAST_TYPE)) { |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
76 *((LTC_FAST_TYPE*)((unsigned char *)cbc->IV + x)) = *((LTC_FAST_TYPE*)((unsigned char *)ct + x)); |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
77 } |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
78 #else |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
79 for (x = 0; x < cbc->blocklen; x++) { |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
80 cbc->IV[x] = ct[x]; |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
81 } |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
82 #endif |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
83 |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
84 ct += cbc->blocklen; |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
85 pt += cbc->blocklen; |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
86 len -= cbc->blocklen; |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
87 } |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
88 } |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
89 return CRYPT_OK; |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
90 } |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
91 |
1c15b283127b
Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
92 #endif |
209 | 93 |
94 /* $Source: /cvs/libtom/libtomcrypt/src/modes/cbc/cbc_encrypt.c,v $ */ | |
95 /* $Revision: 1.7 $ */ | |
96 /* $Date: 2005/05/05 14:35:59 $ */ |