forked from KolibriOS/kolibrios
109 lines
3.3 KiB
PHP
109 lines
3.3 KiB
PHP
; aes256-ctr.inc - AES256 Counter Mode
|
|
;
|
|
; Copyright (C) 2016 Ivan Baravy (dunkaist)
|
|
;
|
|
; This program is free software: you can redistribute it and/or modify
|
|
; it under the terms of the GNU General Public License as published by
|
|
; the Free Software Foundation, either version 3 of the License, or
|
|
; (at your option) any later version.
|
|
;
|
|
; This program is distributed in the hope that it will be useful,
|
|
; but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
; GNU General Public License for more details.
|
|
;
|
|
; You should have received a copy of the GNU General Public License
|
|
; along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
struct aes256_ctr_context aes256_context
|
|
counter rb 16
|
|
output rb 16 ; counter after aes_crypt
|
|
ends
|
|
|
|
|
|
proc aes256_ctr_init _counter
|
|
push ebx esi edi
|
|
|
|
mcall 68, 12, sizeof.aes256_ctr_context
|
|
; handle errors
|
|
mov ecx, 16/4
|
|
mov esi, [_counter]
|
|
lea edi, [eax + aes256_ctr_context.counter]
|
|
rep movsd
|
|
; rep movsd is slow, but we don't care while init
|
|
|
|
pop edi esi ebx
|
|
ret
|
|
endp
|
|
|
|
|
|
proc aes256_ctr_crypt _ctx, _in, _out
|
|
|
|
push ebx esi edi
|
|
|
|
DEBUGF 1,'plain : '
|
|
stdcall dump_128bit_hex, [_in]
|
|
DEBUGF 1,'\n'
|
|
|
|
mov esi, [_ctx]
|
|
lea eax, [esi + aes256_ctr_context.key]
|
|
lea ebx, [esi + aes256_ctr_context.counter]
|
|
lea ecx, [esi + aes256_ctr_context.output]
|
|
|
|
stdcall aes256_encrypt, eax, ebx, ecx ; Key, in, out
|
|
|
|
mov ebx, [_ctx]
|
|
mov esi, [_in]
|
|
mov edi, [_out]
|
|
|
|
mov eax, [esi + 4*0]
|
|
xor eax, dword[ebx + aes256_ctr_context.output + 4*0]
|
|
mov [edi + 4*0], eax
|
|
|
|
mov eax, [esi + 4*1]
|
|
xor eax, dword[ebx + aes256_ctr_context.output + 4*1]
|
|
mov [edi + 4*1], eax
|
|
|
|
mov eax, [esi + 4*2]
|
|
xor eax, dword[ebx + aes256_ctr_context.output + 4*2]
|
|
mov [edi + 4*2], eax
|
|
|
|
mov eax, [esi + 4*3]
|
|
xor eax, dword[ebx + aes256_ctr_context.output + 4*3]
|
|
mov [edi + 4*3], eax
|
|
|
|
; Increment counter
|
|
mov esi, [_ctx]
|
|
|
|
mov eax, dword[esi + aes256_ctr_context.counter + 4*0]
|
|
mov ebx, dword[esi + aes256_ctr_context.counter + 4*1]
|
|
mov ecx, dword[esi + aes256_ctr_context.counter + 4*2]
|
|
mov edx, dword[esi + aes256_ctr_context.counter + 4*3]
|
|
|
|
bswap eax
|
|
bswap ebx
|
|
bswap ecx
|
|
bswap edx
|
|
|
|
inc edx
|
|
adc ecx, 0
|
|
adc ebx, 0
|
|
adc eax, 0
|
|
|
|
bswap eax
|
|
bswap ebx
|
|
bswap ecx
|
|
bswap edx
|
|
|
|
mov dword[esi + aes256_ctr_context.counter + 4*0], eax
|
|
mov dword[esi + aes256_ctr_context.counter + 4*1], ebx
|
|
mov dword[esi + aes256_ctr_context.counter + 4*2], ecx
|
|
mov dword[esi + aes256_ctr_context.counter + 4*3], edx
|
|
|
|
DEBUGF 1,'cipher : '
|
|
stdcall dump_128bit_hex, [_out]
|
|
DEBUGF 1,'\n\n'
|
|
|
|
pop edi esi ebx
|
|
ret
|
|
endp |