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|
;
; GOST89 implementation x64
;
; Copyright (c) 2016. Disk Cryptography Services for EFI (DCS), Alex Kolotnikov
;
; This program and the accompanying materials
; are licensed and made available under the terms and conditions
; of the Apache License, Version 2.0.
;
; The full text of the license may be found at
; https://opensource.org/licenses/Apache-2.0
;
; Some ideas from article https://xakep.ru/2013/10/19/shifrovanie-gost-28147-89/
;
[section .bss align=16]
;///////////////////////////////////////////////////////////////////
;// Win64 registers to save
;///////////////////////////////////////////////////////////////////
%macro SaveRegs 0
sub rsp,8*8+10*16
mov [rsp], rbx
mov [rsp+8], rbp
mov [rsp+8*2], rdi
mov [rsp+8*3], rsi
mov [rsp+8*4], r12
mov [rsp+8*5], r13
mov [rsp+8*6], r14
mov [rsp+8*7], r15
%endmacro
%macro RestoreRegs 0
mov rbx, [rsp]
mov rbp, [rsp+8]
mov rdi, [rsp+8*2]
mov rsi, [rsp+8*3]
mov r12, [rsp+8*4]
mov r13, [rsp+8*5]
mov r14, [rsp+8*6]
mov r15, [rsp+8*7]
add rsp,8*8+10*16
%endmacro
[section .text align=16]
;///////////////////////////////////////////////////////////////////
;// Crypting 2 blocks
;///////////////////////////////////////////////////////////////////
%macro gost_round2 2 ; 1 - pos1, 2 - pos2
; 1st
; 1-2 byte
add ecx, r13d ; add key
movzx edi, cl
movzx esi, ch
xor r14d, dword [r8 + 32 + 256*3*4 + rdi*4]
xor r14d, dword [r8 + 32 + 256*2*4 + rsi*4]
shr ecx, 16
; 3-4 ����
movzx edi, cl
xor r14d, dword [r8 + 32 + 256*4 + rdi*4]
movzx esi, ch
xor r14d, dword [r8 + 32 + rsi*4]
mov edx, [r8 + %1*4] ; read key for second step
; 2nd
; 1-2 byte
add eax, r10d ; read key
movzx r15d, al
movzx ebp, ah
xor r11d, dword [r8 + 32 + 256*3*4 + r15*4]
xor r11d, dword [r8 + 32 + 256*2*4 + rbp*4]
shr eax, 16
; 3-4 ����
movzx r15d, al
xor r11d, dword [r8 + 32 + 256*4 + r15*4]
movzx ebp, ah
xor r11d, dword [r8 + 32 + rbp*4]
mov ebx, [r8 + %1*4] ; read key for second step
; second step
; 1st
; 1-2 byte
add edx, r14d ; add key
movzx edi, dl
movzx esi, dh
xor r13d, dword [r8 + 32 + 256*3*4 + rdi*4]
xor r13d, dword [r8 + 32 + 256*2*4 + rsi*4]
shr edx, 16
; 3-4 ����
movzx edi, dl
xor r13d, dword [r8 + 32 + 256*4 + rdi*4]
movzx esi, dh
xor r13d, dword [r8 + 32 + rsi*4]
mov ecx, [r8 + %2*4] ; read key
; 2nd
; 1-2 byte
add ebx, r11d; ; add key
movzx r15d, bl;
movzx ebp, bh;
xor r10d, dword [r8 + 32 + 256*3*4 + r15*4]
xor r10d, dword [r8 + 32 + 256*2*4 + rbp*4]
shr ebx, 16
; 3-4 ����
movzx r15d, bl
xor r10d, dword [r8 + 32 + 256*4 + r15*4]
movzx ebp, bh
xor r10d, dword [r8 + 32 + rbp*4]
mov eax, [r8 + %2*4] ; read key
%endmacro
; input: r8 - &key, rcx - &IN
; returns: (r13) & (r10)
GostEncrypt2x64:
; 1st
mov r13d, [rcx]
mov r14, [rcx]
shr r14, 32
; 2nd
mov r10d, [rcx + 16]
mov r11, [rcx + 16]
shr r11, 32
mov ecx, [r8]
mov eax, ecx
gost_round2 1, 2
gost_round2 3, 4
gost_round2 5, 6
gost_round2 7, 0
gost_round2 1, 2
gost_round2 3, 4
gost_round2 5, 6
gost_round2 7, 0
gost_round2 1, 2
gost_round2 3, 4
gost_round2 5, 6
gost_round2 7, 7
gost_round2 6, 5
gost_round2 4, 3
gost_round2 2, 1
gost_round2 0, 0
shl r13, 32 ; combine
or r13, r14
shl r10, 32 ; combine
or r10, r11
ret
; input: r8 - &key, rcx - &IN
; returns: (r13) & (r10)
GostDecrypt2x64:
; 1st
mov r13d, [rcx]
mov r14, [rcx]
shr r14, 32
; 2nd
mov r10d, [rcx + 16]
mov r11, [rcx + 16]
shr r11, 32
mov ecx, [r8]
mov eax, ecx
gost_round2 1, 2
gost_round2 3, 4
gost_round2 5, 6
gost_round2 7, 7
gost_round2 6, 5
gost_round2 4, 3
gost_round2 2, 1
gost_round2 0, 7
gost_round2 6, 5
gost_round2 4, 3
gost_round2 2, 1
gost_round2 0, 7
gost_round2 6, 5
gost_round2 4, 3
gost_round2 2, 1
gost_round2 0, 0
shl r13, 32 ; combine
or r13, r14
shl r10, 32 ; combine
or r10, r11
ret
;///////////////////////////////////////////////////////////////////
;// Crypting 1 block
;///////////////////////////////////////////////////////////////////
%macro gost_round1 2 ; 1 - pos1, 2 - pos2
; 1-2 byte
add ecx, r13d ; add key
movzx edi, cl
movzx esi, ch
xor r14d, dword [r8 + 32 + 256*3*4 + rdi*4]
xor r14d, dword [r8 + 32 + 256*2*4 + rsi*4]
shr ecx, 16
; 3-4 ����
movzx edi, cl
xor r14d, dword [r8 + 32 + 256*4 + rdi*4]
movzx esi, ch
xor r14d, dword [r8 + 32 + rsi*4]
mov edx, [r8 + %1*4] ; read key for second step
; second step
; 1-2 byte
add edx, r14d ; add key
movzx edi, dl
movzx esi, dh
xor r13d, dword [r8 + 32 + 256*3*4 + rdi*4]
xor r13d, dword [r8 + 32 + 256*2*4 + rsi*4]
shr edx, 16
; 3-4 ����
movzx edi, dl
xor r13d, dword [r8 + 32 + 256*4 + rdi*4]
movzx esi, dh
xor r13d, dword [r8 + 32 + rsi*4]
mov ecx, [r8 + %2*4] ; read key
%endmacro
; input: r8 - &gost_kds rcx - &IN
; returns: r13
GostEncrypt1x64:
mov r13d, [rcx]
mov r14, [rcx]
shr r14, 32
mov ecx, [r8]
gost_round1 1, 2
gost_round1 3, 4
gost_round1 5, 6
gost_round1 7, 0
gost_round1 1, 2
gost_round1 3, 4
gost_round1 5, 6
gost_round1 7, 0
gost_round1 1, 2
gost_round1 3, 4
gost_round1 5, 6
gost_round1 7, 7
gost_round1 6, 5
gost_round1 4, 3
gost_round1 2, 1
gost_round1 0, 0
shl r13, 32 ; combine
or r13, r14
ret
; input: r8 - &gost_kds rcx - IN
; returns: r13
GostDecrypt1x64:
mov r13d, [rcx]
mov r14, [rcx]
shr r14, 32
mov ecx, [r8]
gost_round1 1, 2
gost_round1 3, 4
gost_round1 5, 6
gost_round1 7, 7
gost_round1 6, 5
gost_round1 4, 3
gost_round1 2, 1
gost_round1 0, 7
gost_round1 6, 5
gost_round1 4, 3
gost_round1 2, 1
gost_round1 0, 7
gost_round1 6, 5
gost_round1 4, 3
gost_round1 2, 1
gost_round1 0, 0
shl r13, 32 ; combine
or r13, r14
ret
global gost_encrypt_128_CBC_asm ; gost_encrypt_128_CBC_asm(uint64* in, uint64* out, gost_kds* kds, uint64 count);
; rcx - &in
; rdx - &out
; r8 - &gost_kds
; r9 - count
gost_encrypt_128_CBC_asm:
SaveRegs ; Saving
sub rsp, 32
mov [rsp], rdx ; Save out addr
mov [rsp + 8], rcx ; Save in addr
mov [rsp + 16], r8 ; key addr
.do:
mov [rsp + 24], r9 ; Save count
cmp r9, 2
jge .blk2
cmp r9, 1
jge .blk1
jmp .end
; One 128 block encryption
.blk1:
mov rcx, [rsp + 8] ; set in addr
call GostEncrypt1x64
mov rdx, [rsp] ; Restore out
mov rcx, [rsp + 8] ; restore in
mov [rdx], r13
mov rax, [rcx + 8]
xor rax, r13 ; CBC
add rdx, 8 ;next 8 bytes
mov [rdx], rax
mov rcx, rdx
call GostEncrypt1x64
mov rdx, [rsp] ; Restore out addr
mov rcx, [rsp+8] ; Restore in addr
mov [rdx + 8], r13
add rdx,16
mov [rsp], rdx
add rcx, 16
mov [rsp+8], rcx
mov r9, [rsp + 24]
dec r9
jmp .do
.blk2:
mov rcx, [rsp + 8] ; set in addr
call GostEncrypt2x64
mov rdx, [rsp] ; Restore out
mov rcx, [rsp + 8] ; restore in
mov [rdx], r13
mov rax, [rcx + 8]
xor rax, r13 ; CBC
mov [rdx + 16], r10
mov rbx, [rcx + 24]
xor rbx, r10 ; CBC
mov [rdx + 8], rax
mov [rdx + 24], rbx
add rdx, 8 ;next 8 bytes
mov rcx, rdx
call GostEncrypt2x64
mov rdx, [rsp] ; Restore out addr
mov rcx, [rsp+8] ; Restore in addr
mov [rdx + 8], r13
mov [rdx + 24], r10
add rdx,32
mov [rsp], rdx
add rcx, 32
mov [rsp+8], rcx
mov r9, [rsp + 24]
sub r9, 2
jmp .do
.end:
add rsp, 32 ; Load out addr
RestoreRegs ; Load
ret
global gost_decrypt_128_CBC_asm ; gost_decrypt_128_CBC_asm(uint64* in, uint64* out, const gost_kds* kds, uint64 count);
; rcx - &in
; rdx - &out
; r8 - &gost_kds
; r9 - count
gost_decrypt_128_CBC_asm:
SaveRegs ; Saving
sub rsp, 32
mov [rsp], rdx ; Save out addr
mov [rsp+8], rcx ; Save in addr
mov [rsp+16], r8 ; key addr
.do:
mov [rsp + 24], r9 ; Save count
cmp r9, 2
jge .blk2
cmp r9, 1
jge .blk1
jmp .end
; One 128 block decryption
.blk1:
add rcx, 8
call GostDecrypt1x64
mov rdx, [rsp] ; Restore out
mov rcx, [rsp + 8] ; Restore in
mov rax, [rcx]
xor rax, r13 ; CBC
mov [rdx + 8], rax
call GostDecrypt1x64
mov rdx, [rsp] ; Restore out addr
mov rcx, [rsp+8] ; Restore in addr
mov [rdx], r13
add rdx,16
mov [rsp], rdx
add rcx, 16
mov [rsp+8], rcx
mov r9, [rsp + 24]
dec r9
jmp .do
.blk2:
add rcx, 8
call GostDecrypt2x64
mov rdx, [rsp] ; Restore out
mov rcx, [rsp + 8] ; Restore in
mov rax, [rcx]
xor rax, r13 ; CBC
mov [rdx + 8], rax
mov rbx, [rcx+16]
xor rbx, r10 ; CBC
mov [rdx + 24], rbx
call GostDecrypt2x64
mov rdx, [rsp] ; Restore out addr
mov rcx, [rsp+8] ; Restore in addr
mov [rdx], r13
mov [rdx+16], r10
add rdx,32
mov [rsp], rdx
add rcx,32
mov [rsp+8], rcx
mov r9, [rsp + 24]
sub r9, 2
jmp .do
.end:
add rsp, 32 ; Load out addr
RestoreRegs ; Load
ret
|