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https://github.com/rn10950/RetroZilla.git
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140 lines
5.3 KiB
NASM
140 lines
5.3 KiB
NASM
; ***** BEGIN LICENSE BLOCK *****
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; Version: MPL 1.1/GPL 2.0/LGPL 2.1
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;
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; The contents of this file are subject to the Mozilla Public License Version
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; 1.1 (the "License"); you may not use this file except in compliance with
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; the License. You may obtain a copy of the License at
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; http://www.mozilla.org/MPL/
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;
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; Software distributed under the License is distributed on an "AS IS" basis,
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; WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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; for the specific language governing rights and limitations under the
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; License.
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;
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; The Original Code is "Marc Bevand's fast AMD64 ARCFOUR source"
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;
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; The Initial Developer of the Original Code is
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; Marc Bevand <bevand_m@epita.fr> .
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; Portions created by the Initial Developer are
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; Copyright (C) 2004 the Initial Developer. All Rights Reserved.
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;
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; Contributor(s): Makoto Kato (m_kato@ga2.so-net.ne.jp)
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;
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; Alternatively, the contents of this file may be used under the terms of
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; either the GNU General Public License Version 2 or later (the "GPL"), or
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; the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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; in which case the provisions of the GPL or the LGPL are applicable instead
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; of those above. If you wish to allow use of your version of this file only
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; under the terms of either the GPL or the LGPL, and not to allow others to
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; use your version of this file under the terms of the MPL, indicate your
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; decision by deleting the provisions above and replace them with the notice
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; and other provisions required by the GPL or the LGPL. If you do not delete
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; the provisions above, a recipient may use your version of this file under
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; the terms of any one of the MPL, the GPL or the LGPL.
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;
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; ***** END LICENSE BLOCK *****
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; ** ARCFOUR implementation optimized for AMD64.
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; **
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; ** The throughput achieved by this code is about 320 MBytes/sec, on
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; ** a 1.8 GHz AMD Opteron (rev C0) processor.
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.CODE
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; extern void ARCFOUR(RC4Context *cx, unsigned long long inputLen,
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; const unsigned char *input, unsigned char *output);
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ARCFOUR PROC
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push rbp
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push rbx
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push rsi
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push rdi
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mov rbp, rcx ; key = ARG(key)
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mov rbx, rdx ; rbx = ARG(len)
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mov rsi, r8 ; in = ARG(in)
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mov rdi, r9 ; out = ARG(out)
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mov rcx, [rbp] ; x = key->x
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mov rdx, [rbp+8] ; y = key->y
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add rbp, 16 ; d = key->data
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inc rcx ; x++
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and rcx, 0ffh ; x &= 0xff
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lea rbx, [rbx+rsi-8] ; rbx = in+len-8
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mov r9, rbx ; tmp = in+len-8
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mov rax, [rbp+rcx*8] ; tx = d[x]
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cmp rbx, rsi ; cmp in with in+len-8
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jl Lend ; jump if (in+len-8 < in)
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Lstart:
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add rsi, 8 ; increment in
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add rdi, 8 ; increment out
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;
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; generate the next 8 bytes of the rc4 stream into r8
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;
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mov r11, 8 ; byte counter
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@@:
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add dl, al ; y += tx
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mov ebx, [rbp+rdx*8] ; ty = d[y]
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mov [rbp+rcx*8], ebx ; d[x] = ty
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add bl, al ; val = ty + tx
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mov [rbp+rdx*8], eax ; d[y] = tx
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inc cl ; x++ (NEXT ROUND)
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mov eax, [rbp+rcx*8] ; tx = d[x] (NEXT ROUND)
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mov r8b, [rbp+rbx*8] ; val = d[val]
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dec r11b
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ror r8, 8 ; (ror does not change ZF)
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jnz @b
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;
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; xor 8 bytes
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;
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xor r8, [rsi-8]
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cmp rsi, r9 ; cmp in+len-8 with in
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mov [rdi-8], r8
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jle Lstart
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Lend:
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add r9, 8 ; tmp = in+len
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;
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; handle the last bytes, one by one
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;
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@@:
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cmp r9, rsi ; cmp in with in+len
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jle Lfinished ; jump if (in+len <= in)
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add dl, al ; y += tx
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mov ebx, [rbp+rdx*8] ; ty = d[y]
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mov [rbp+rcx*8], ebx ; d[x] = ty
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add bl, al ; val = ty + tx
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mov [rbp+rdx*8], eax ; d[y] = tx
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inc cl ; x++ (NEXT ROUND)
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mov eax, [rbp+rcx*8] ; tx = d[x] (NEXT ROUND)
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mov r8b, [rbp+rbx*8] ; val = d[val]
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xor r8b, [rsi] ; xor 1 byte
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mov [rdi], r8b
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inc rsi ; in++
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inc rdi
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jmp @b
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Lfinished:
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dec rcx ; x--
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mov [rbp-8], dl ; key->y = y
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mov [rbp-16], cl ; key->x = x
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pop rdi
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pop rsi
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pop rbx
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pop rbp
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ret
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ARCFOUR ENDP
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END
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