| 9070 |
hidnplayr |
1 |
; blowfish-ctr.inc - Blowfish Counter Mode |
|
|
2 |
; |
|
|
3 |
; Copyright (C) 2016 Ivan Baravy (dunkaist) |
|
|
4 |
; |
|
|
5 |
; This program is free software: you can redistribute it and/or modify |
|
|
6 |
; it under the terms of the GNU General Public License as published by |
|
|
7 |
; the Free Software Foundation, either version 3 of the License, or |
|
|
8 |
; (at your option) any later version. |
|
|
9 |
; |
|
|
10 |
; This program is distributed in the hope that it will be useful, |
|
|
11 |
; but WITHOUT ANY WARRANTY; without even the implied warranty of |
|
|
12 |
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
|
|
13 |
; GNU General Public License for more details. |
|
|
14 |
; |
|
|
15 |
; You should have received a copy of the GNU General Public License |
|
|
16 |
; along with this program. If not, see . |
|
|
17 |
|
|
|
18 |
struct blowfish_ctr_context blowfish_context |
|
|
19 |
counter rb BLOWFISH_BLOCKSIZE |
|
|
20 |
output rb BLOWFISH_BLOCKSIZE ; counter after blowfish_crypt |
|
|
21 |
ends |
|
|
22 |
|
|
|
23 |
|
|
|
24 |
proc blowfish_ctr_init _counter |
|
|
25 |
push ebx esi edi |
|
|
26 |
|
|
|
27 |
mcall 68, 12, sizeof.blowfish_ctr_context |
|
|
28 |
; handle errors |
|
|
29 |
mov ecx, BLOWFISH_BLOCKSIZE/4 |
|
|
30 |
mov esi, [_counter] |
|
|
31 |
lea edi, [eax + blowfish_ctr_context.counter] |
|
|
32 |
rep movsd |
|
|
33 |
; rep movsd is slow, but we don't care while init |
|
|
34 |
|
|
|
35 |
pop edi esi ebx |
|
|
36 |
ret |
|
|
37 |
endp |
|
|
38 |
|
|
|
39 |
|
|
|
40 |
proc blowfish_ctr_crypt _ctx, _in, _out |
|
|
41 |
|
|
|
42 |
push ebx esi edi |
|
|
43 |
|
|
|
44 |
DEBUGF 1,'plain : ' |
|
|
45 |
stdcall dump_hex, [_in], 4 |
|
|
46 |
|
|
|
47 |
mov esi, [_ctx] |
|
|
48 |
lea eax, [esi + blowfish_ctr_context.key] |
|
|
49 |
lea ebx, [esi + blowfish_ctr_context.counter] |
|
|
50 |
lea ecx, [esi + blowfish_ctr_context.output] |
|
|
51 |
|
|
|
52 |
stdcall blowfish_encrypt, eax, ebx, ecx ; Key, in, out |
|
|
53 |
|
|
|
54 |
mov ebx, [_ctx] |
|
|
55 |
mov esi, [_in] |
|
|
56 |
mov edi, [_out] |
|
|
57 |
|
|
|
58 |
mov eax, [esi + 4*0] |
|
|
59 |
xor eax, dword[ebx + blowfish_ctr_context.output + 4*0] |
|
|
60 |
mov [edi + 4*0], eax |
|
|
61 |
|
|
|
62 |
mov eax, [esi + 4*1] |
|
|
63 |
xor eax, dword[ebx + blowfish_ctr_context.output + 4*1] |
|
|
64 |
mov [edi + 4*1], eax |
|
|
65 |
|
|
|
66 |
mov eax, [esi + 4*2] |
|
|
67 |
xor eax, dword[ebx + blowfish_ctr_context.output + 4*2] |
|
|
68 |
mov [edi + 4*2], eax |
|
|
69 |
|
|
|
70 |
mov eax, [esi + 4*3] |
|
|
71 |
xor eax, dword[ebx + blowfish_ctr_context.output + 4*3] |
|
|
72 |
mov [edi + 4*3], eax |
|
|
73 |
|
|
|
74 |
; Increment counter |
|
|
75 |
mov esi, [_ctx] |
|
|
76 |
|
|
|
77 |
mov eax, dword[esi + blowfish_ctr_context.counter + 4*0] |
|
|
78 |
mov ebx, dword[esi + blowfish_ctr_context.counter + 4*1] |
|
|
79 |
mov ecx, dword[esi + blowfish_ctr_context.counter + 4*2] |
|
|
80 |
mov edx, dword[esi + blowfish_ctr_context.counter + 4*3] |
|
|
81 |
|
|
|
82 |
bswap eax |
|
|
83 |
bswap ebx |
|
|
84 |
bswap ecx |
|
|
85 |
bswap edx |
|
|
86 |
|
| 9106 |
hidnplayr |
87 |
adc edx, 1 |
| 9070 |
hidnplayr |
88 |
adc ecx, 0 |
|
|
89 |
adc ebx, 0 |
|
|
90 |
adc eax, 0 |
|
|
91 |
|
|
|
92 |
bswap eax |
|
|
93 |
bswap ebx |
|
|
94 |
bswap ecx |
|
|
95 |
bswap edx |
|
|
96 |
|
|
|
97 |
mov dword[esi + blowfish_ctr_context.counter + 4*0], eax |
|
|
98 |
mov dword[esi + blowfish_ctr_context.counter + 4*1], ebx |
|
|
99 |
mov dword[esi + blowfish_ctr_context.counter + 4*2], ecx |
|
|
100 |
mov dword[esi + blowfish_ctr_context.counter + 4*3], edx |
|
|
101 |
|
|
|
102 |
DEBUGF 1,'cipher : ' |
|
|
103 |
stdcall dump_hex, [_out], 4 |
|
|
104 |
|
|
|
105 |
pop edi esi ebx |
|
|
106 |
ret |
|
|
107 |
endp |