2 * Copyright (c) 2017 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_aes_small_ctrcbc_init(br_aes_small_ctrcbc_keys
*ctx
,
30 const void *key
, size_t len
)
32 ctx
->vtable
= &br_aes_small_ctrcbc_vtable
;
33 ctx
->num_rounds
= br_aes_keysched(ctx
->skey
, key
, len
);
37 xorbuf(void *dst
, const void *src
, size_t len
)
40 const unsigned char *s
;
49 /* see bearssl_block.h */
51 br_aes_small_ctrcbc_ctr(const br_aes_small_ctrcbc_keys
*ctx
,
52 void *ctr
, void *data
, size_t len
)
54 unsigned char *buf
, *bctr
;
55 uint32_t cc0
, cc1
, cc2
, cc3
;
59 cc3
= br_dec32be(bctr
+ 0);
60 cc2
= br_dec32be(bctr
+ 4);
61 cc1
= br_dec32be(bctr
+ 8);
62 cc0
= br_dec32be(bctr
+ 12);
64 unsigned char tmp
[16];
67 br_enc32be(tmp
+ 0, cc3
);
68 br_enc32be(tmp
+ 4, cc2
);
69 br_enc32be(tmp
+ 8, cc1
);
70 br_enc32be(tmp
+ 12, cc0
);
71 br_aes_small_encrypt(ctx
->num_rounds
, ctx
->skey
, tmp
);
76 carry
= (~(cc0
| -cc0
)) >> 31;
78 carry
&= (~(cc1
| -cc1
)) >> 31;
80 carry
&= (~(cc2
| -cc2
)) >> 31;
83 br_enc32be(bctr
+ 0, cc3
);
84 br_enc32be(bctr
+ 4, cc2
);
85 br_enc32be(bctr
+ 8, cc1
);
86 br_enc32be(bctr
+ 12, cc0
);
89 /* see bearssl_block.h */
91 br_aes_small_ctrcbc_mac(const br_aes_small_ctrcbc_keys
*ctx
,
92 void *cbcmac
, const void *data
, size_t len
)
94 const unsigned char *buf
;
98 xorbuf(cbcmac
, buf
, 16);
99 br_aes_small_encrypt(ctx
->num_rounds
, ctx
->skey
, cbcmac
);
105 /* see bearssl_block.h */
107 br_aes_small_ctrcbc_encrypt(const br_aes_small_ctrcbc_keys
*ctx
,
108 void *ctr
, void *cbcmac
, void *data
, size_t len
)
110 br_aes_small_ctrcbc_ctr(ctx
, ctr
, data
, len
);
111 br_aes_small_ctrcbc_mac(ctx
, cbcmac
, data
, len
);
114 /* see bearssl_block.h */
116 br_aes_small_ctrcbc_decrypt(const br_aes_small_ctrcbc_keys
*ctx
,
117 void *ctr
, void *cbcmac
, void *data
, size_t len
)
119 br_aes_small_ctrcbc_mac(ctx
, cbcmac
, data
, len
);
120 br_aes_small_ctrcbc_ctr(ctx
, ctr
, data
, len
);
123 /* see bearssl_block.h */
124 const br_block_ctrcbc_class br_aes_small_ctrcbc_vtable
= {
125 sizeof(br_aes_small_ctrcbc_keys
),
128 (void (*)(const br_block_ctrcbc_class
**, const void *, size_t))
129 &br_aes_small_ctrcbc_init
,
130 (void (*)(const br_block_ctrcbc_class
*const *,
131 void *, void *, void *, size_t))
132 &br_aes_small_ctrcbc_encrypt
,
133 (void (*)(const br_block_ctrcbc_class
*const *,
134 void *, void *, void *, size_t))
135 &br_aes_small_ctrcbc_decrypt
,
136 (void (*)(const br_block_ctrcbc_class
*const *,
137 void *, void *, size_t))
138 &br_aes_small_ctrcbc_ctr
,
139 (void (*)(const br_block_ctrcbc_class
*const *,
140 void *, const void *, size_t))
141 &br_aes_small_ctrcbc_mac