2 * Copyright (c) 2016 Thomas Pornin <pornin@bolet.org>
4 * Permission is hereby granted, free of charge, to any person obtaining
5 * a copy of this software and associated documentation files (the
6 * "Software"), to deal in the Software without restriction, including
7 * without limitation the rights to use, copy, modify, merge, publish,
8 * distribute, sublicense, and/or sell copies of the Software, and to
9 * permit persons to whom the Software is furnished to do so, subject to
10 * the following conditions:
12 * The above copyright notice and this permission notice shall be
13 * included in all copies or substantial portions of the Software.
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
16 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
17 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
18 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
19 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
20 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
21 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
27 /* see bearssl_block.h */
29 br_des_tab_cbcdec_init(br_des_tab_cbcdec_keys
*ctx
,
30 const void *key
, size_t len
)
32 ctx
->vtable
= &br_des_tab_cbcdec_vtable
;
33 ctx
->num_rounds
= br_des_tab_keysched(ctx
->skey
, key
, len
);
35 br_des_rev_skey(ctx
->skey
);
39 for (i
= 0; i
< 48; i
+= 2) {
43 ctx
->skey
[i
] = ctx
->skey
[94 - i
];
44 ctx
->skey
[94 - i
] = t
;
46 ctx
->skey
[i
+ 1] = ctx
->skey
[95 - i
];
47 ctx
->skey
[95 - i
] = t
;
52 /* see bearssl_block.h */
54 br_des_tab_cbcdec_run(const br_des_tab_cbcdec_keys
*ctx
,
55 void *iv
, void *data
, size_t len
)
57 unsigned char *buf
, *ivbuf
;
66 br_des_tab_process_block(ctx
->num_rounds
, ctx
->skey
, buf
);
67 for (i
= 0; i
< 8; i
++) {
70 memcpy(ivbuf
, tmp
, 8);
76 /* see bearssl_block.h */
77 const br_block_cbcdec_class br_des_tab_cbcdec_vtable
= {
78 sizeof(br_des_tab_cbcdec_keys
),
81 (void (*)(const br_block_cbcdec_class
**, const void *, size_t))
82 &br_des_tab_cbcdec_init
,
83 (void (*)(const br_block_cbcdec_class
*const *, void *, void *, size_t))
84 &br_des_tab_cbcdec_run