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woody-woodpacker
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feat(print.s): payload should be OK

This commit is contained in:
gbrochar 2024-06-20 08:45:15 +02:00
parent 78ff534aee
commit 0f93258a88
3 changed files with 31 additions and 11 deletions
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38
print.s
View File

@ -10,6 +10,16 @@ _start:
push r14
push r15
push rax
push rcx
push rdx
push rsi
push rdi
push r8
push r9
push r10
push r11
mov rdi, 1
lea rsi, [rel msg]
mov rbx, rsi
@ -17,9 +27,6 @@ _start:
mov r8, qword [rel section_size] ;text_section size
shr r8, 2
inc r8
inc r8
inc r8
inc r8
mov r9, 0 ;increment register
mov r10, 0 ;increment register
xor r10, r10
@ -47,16 +54,18 @@ _start:
and r12, qword [rsp + 16]
jz sq_mul_bit_index
sq_mul_loop:
; check if pow is zero
shr r11, 1
cmp r11, 0
je decrypt_loop2
; square ...
mul rax,
; modulo n ...
mov r13, qword [rsp + 8]
xor rdx, rdx
div r13
mov rax, rdx
; modulo n ...
; ... and multiply
mov r12, r11
and r12, qword [rsp + 16]
cmp r12, 0
@ -68,7 +77,7 @@ _start:
xor rdx, rdx
div r13
mov rax, rdx
; modulo n ...
; end of loop
jmp sq_mul_loop
decrypt_loop:
@ -84,22 +93,21 @@ _start:
sub rax, r10 ; remove index of result (caesar like cypher so 0/42 values are differents)
; unpadding and write back here
mov dword [rbx + r9], 0
mov rcx, r10
mov r15, r10
shr r15, 5
shl r15, 2
inc rcx
mov rcx, r10
shl rcx, 59
shr rcx, 59
inc rcx
shl rax, cl
mov r14, r9
sub r14, r15
add [rbx + r14], eax
mov rcx, rax
shr rcx, 32
shr rax, 32
cmp r9, 0
je first_block_skip
add [rbx + r14 - 4], ecx
add [rbx + r14 - 4], eax
first_block_skip:
; unpadding and write back here
@ -116,6 +124,16 @@ _start:
pop r12 ; pop rsa.n
pop r12 ; pop rsa.d
pop r11
pop r10
pop r9
pop r8
pop rdi
pop rsi
pop rdx
pop rcx
pop rax
pop r15
pop r14
pop r13

2
srcs/rsa.c
View File

@ -48,6 +48,8 @@ rsa_t rsa_generate_keys(void) {
rsa_t rsa;
rsa.d = d;
rsa.n = n;
//rsa.d = 104320933;
//rsa.n = 2959006679;
return rsa;
}

2
zreset_woody.sh
View File

@ -1 +1 @@
./gen_payload.sh && rm -f woody && ./woody_woodpacker resources/sample64 | less
./gen_payload.sh && rm -f woody && ./woody_woodpacker resources/sample64 > log && xxd woody > dump