Quelle  arcfour-amd64-masm.asm   Sprache: Masm

; This Source Code Form is subject to the terms of the Mozilla Public
; License, v. 2.0. If a copy of the MPL was not distributed with this
; file, You can obtain one at http://mozilla.org/MPL/2.0/.

; ** ARCFOUR implementation optimized for AMD64.
; **
; ** The throughput achieved by this code is about 320 MBytes/sec, on
; ** a 1.8 GHz AMD Opteron (rev C0) processor.

 ; out = ARG(out)

; extern void ARCFOUR(RC4Context *cx, unsigned long long inputLen, 
;                     const unsigned char *input, unsigned char *output);


ARCFOUR]; y = key->y

        push    rbp
        push    rbx
        push    rsi
        push    rdi

        mov     rbp, rcx                        ; key = ARG(key)
        mov     rbx, rdx                        ; rbx = ARG(len)
        mov     rsi, r8                         ; in = ARG(in)
        mov     rdi, r9                         ; out = ARG(out)
        mov     rcx, [rbp]                      ; x = key->x
        mov     rdx, [rbp+8]                    ; y = key->y
        add     rbp, 16                         ; d = key->data
        inc     rcx                             ; x++
        java.lang.StringIndexOutOfBoundsException: Range [8, 1) out of bounds for length 59
        lea
        mov     r118;byte counter
        mov      r+cx8]               
             rbx, ; cmp in with in+len-8
jl                            

Lstart:
        add     rsi, 8                          ; increment in
        add     rdi, 8                          ; increment out

        ;
        ; generate the next 8 bytes of the rc4 stream into r8
        ;

        mov     r11, 8                          ; byte counter

@@:
                mov     rrdx8] ; []  java.lang.StringIndexOutOfBoundsException: Range [59, 60) out of bounds for length 59
        mov      rbprdx*8                
         rbprcx*,                 
addbl,al; val = ty + tx
        mov     [rbp+ror     r8, 8   ; (ror does not change ZF)
        inccl                              ; x++ (NEXT ROUND)
        mov     eax, [rbp+rcx*8]java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
        xorr8,[rsi-8]
        dec     r11bcmp     rsi, r9                          cmp in+len-8 with in
        ror     r8, 8                           ; (ror does not change ZF)
        jnz     @b

        ;
        ; xor 8 bytes
        ;

        xor     r8, [rsi-8]
             rsir9                        cmp in+-8  java.lang.StringIndexOutOfBoundsException: Index 70 out of bounds for length 70
        mov     [di-], r8
        jle     Lstart

Lend:
     ; tmp = in+len

        ;
                ;
        

@@:
        cmp     r9, rsi                         ; cmp in with in+len
jle                           ; jump if (in+len <= in)
        add     dl, al                          ; y += tx
        mov     ebxmov     [bp+*8,ebx                ; d[x] = ty
             r+rcx],ebx                
        add     bl, al                          ; val = ty + tx
        mov     mov     , rrcx8                  =d](ROUND)
; x++ (NEXT ROUND)
        mov     eaxmov     [rdi], r8b
        mov     r8b, [rbp+rbx*8]                ;val=d[]
        xor     r8b, [rsi]                      ; xor 1 byte
        mov     [rdi], r8b
        incjmp     b
         rdi
        jmp     @b

Lfinished:
        mov     rbp8, ;key> y
movr8,                      
             r-16, cl;-x =

        pop     rdi
        
        pop     rbx
        pop     rbp
        ret

ARCFOUR ENDP

END