/*
 Derived from source code of TrueCrypt 7.1a, which is
 Copyright (c) 2008-2012 TrueCrypt Developers Association and which is governed
 by the TrueCrypt License 3.0.

 Modifications and additions to the original source code (contained in this file)
 and all other portions of this file are Copyright (c) 2013-2017 IDRIX
 and are governed by the Apache License 2.0 the full text of which is
 contained in the file License.txt included in VeraCrypt binary and source
 code distribution packages.
*/

#include "Common/Tcdefs.h"
#include "VolumeInfo.h"
#include "Platform/SerializerFactory.h"

namespace VeraCrypt
{
	void VolumeInfo::Deserialize (shared_ptr <Stream> stream)
	{
		Serializer sr (stream);

		sr.Deserialize ("ProgramVersion", ProgramVersion);
		AuxMountPoint = sr.DeserializeWString ("AuxMountPoint");
		sr.Deserialize ("EncryptionAlgorithmBlockSize", EncryptionAlgorithmBlockSize);
		sr.Deserialize ("EncryptionAlgorithmKeySize", EncryptionAlgorithmKeySize);
		sr.Deserialize ("EncryptionAlgorithmMinBlockSize", EncryptionAlgorithmMinBlockSize);
		EncryptionAlgorithmName = sr.DeserializeWString ("EncryptionAlgorithmName");
		EncryptionModeName = sr.DeserializeWString ("EncryptionModeName");
		sr.Deserialize ("HeaderCreationTime", HeaderCreationTime);
		sr.Deserialize ("HiddenVolumeProtectionTriggered", HiddenVolumeProtectionTriggered);
		LoopDevice = sr.DeserializeWString ("LoopDevice");

		if (ProgramVersion >= 0x10b)
			sr.Deserialize ("MinRequiredProgramVersion", MinRequiredProgramVersion);

		MountPoint = sr.DeserializeWString ("MountPoint");
		Path = sr.DeserializeWString ("Path");
		sr.Deserialize ("Pkcs5IterationCount", Pkcs5IterationCount);
		Pkcs5PrfName = sr.DeserializeWString ("Pkcs5PrfName");
		Protection = static_cast <VolumeProtection::Enum> (sr.DeserializeInt32 ("Protection"));
		sr.Deserialize ("SerialInstanceNumber", SerialInstanceNumber);
		sr.Deserialize ("Size", Size);
		sr.Deserialize ("SlotNumber", SlotNumber);

		if (ProgramVersion >= 0x10b)
			sr.Deserialize ("SystemEncryption", SystemEncryption);

		if (ProgramVersion >= 0x10b)
			sr.Deserialize ("TopWriteOffset", TopWriteOffset);

		sr.Deserialize ("TotalDataRead", TotalDataRead);
		sr.Deserialize ("TotalDataWritten", TotalDataWritten);
		Type = static_cast <VolumeType::Enum> (sr.DeserializeInt32 ("Type"));
		VirtualDevice = sr.DeserializeWString ("VirtualDevice");
		sr.Deserialize ("VolumeCreationTime", VolumeCreationTime);
		sr.Deserialize ("Pim", Pim);
	}

	bool VolumeInfo::FirstVolumeMountedAfterSecond (shared_ptr <VolumeInfo> first, shared_ptr <VolumeInfo> second)
	{
		return first->SerialInstanceNumber > second->SerialInstanceNumber;
	}

	void VolumeInfo::Serialize (shared_ptr <Stream> stream) const
	{
		Serializable::Serialize (stream);
		Serializer sr (stream);

		const uint32 version = VERSION_NUM;
		sr.Serialize ("ProgramVersion", version);
		sr.Serialize ("AuxMountPoint", wstring (AuxMountPoint));
		sr.Serialize ("EncryptionAlgorithmBlockSize", EncryptionAlgorithmBlockSize);
		sr.Serialize ("EncryptionAlgorithmKeySize", EncryptionAlgorithmKeySize);
		sr.Serialize ("EncryptionAlgorithmMinBlockSize", EncryptionAlgorithmMinBlockSize);
		sr.Serialize ("EncryptionAlgorithmName", EncryptionAlgorithmName);
		sr.Serialize ("EncryptionModeName", EncryptionModeName);
		sr.Serialize ("HeaderCreationTime", HeaderCreationTime);
		sr.Serialize ("HiddenVolumeProtectionTriggered", HiddenVolumeProtectionTriggered);
		sr.Serialize ("LoopDevice", wstring (LoopDevice));
		sr.Serialize ("MinRequiredProgramVersion", MinRequiredProgramVersion);
		sr.Serialize ("MountPoint", wstring (MountPoint));
		sr.Serialize ("Path", wstring (Path));
		sr.Serialize ("Pkcs5IterationCount", Pkcs5IterationCount);
		sr.Serialize ("Pkcs5PrfName", Pkcs5PrfName);
		sr.Serialize ("Protection", static_cast <uint32> (Protection));
		sr.Serialize ("SerialInstanceNumber", SerialInstanceNumber);
		sr.Serialize ("Size", Size);
		sr.Serialize ("SlotNumber", SlotNumber);
		sr.Serialize ("SystemEncryption", SystemEncryption);
		sr.Serialize ("TopWriteOffset", TopWriteOffset);
		sr.Serialize ("TotalDataRead", TotalDataRead);
		sr.Serialize ("TotalDataWritten", TotalDataWritten);
		sr.Serialize ("Type", static_cast <uint32> (Type));
		sr.Serialize ("VirtualDevice", wstring (VirtualDevice));
		sr.Serialize ("VolumeCreationTime", VolumeCreationTime);
		sr.Serialize ("Pim", Pim);
	}

	void VolumeInfo::Set (const Volume &volume)
	{
		EncryptionAlgorithmBlockSize = static_cast <uint32> (volume.GetEncryptionAlgorithm()->GetMaxBlockSize());
		EncryptionAlgorithmKeySize = static_cast <uint32> (volume.GetEncryptionAlgorithm()->GetKeySize());
		EncryptionAlgorithmMinBlockSize = static_cast <uint32> (volume.GetEncryptionAlgorithm()->GetMinBlockSize());
		EncryptionAlgorithmName = volume.GetEncryptionAlgorithm()->GetName();
		EncryptionModeName = volume.GetEncryptionMode()->GetName();
		HeaderCreationTime = volume.GetHeaderCreationTime();
		VolumeCreationTime = volume.GetVolumeCreationTime();
		HiddenVolumeProtectionTriggered = volume.IsHiddenVolumeProtectionTriggered();
		MinRequiredProgramVersion = volume.GetHeader()->GetRequiredMinProgramVersion();
		Path = volume.GetPath();
		Pkcs5IterationCount = volume.GetPkcs5Kdf()->GetIterationCount(volume.GetPim ());
		Pkcs5PrfName = volume.GetPkcs5Kdf()->GetName();
		Protection = volume.GetProtectionType();
		Size = volume.GetSize();
		SystemEncryption = volume.IsInSystemEncryptionScope();
		Type = volume.GetType();
		TopWriteOffset = volume.GetTopWriteOffset();
		TotalDataRead = volume.GetTotalDataRead();
		TotalDataWritten = volume.GetTotalDataWritten();
		Pim = volume.GetPim ();
	}

	TC_SERIALIZER_FACTORY_ADD_CLASS (VolumeInfo);
}

; ---------------------------------------------------------------------------
; Copyright (c) 1998-2007, Brian Gladman, Worcester, UK. All rights reserved.
;
; LICENSE TERMS
;
; The free distribution and use of this software is allowed (with or without
; changes) provided that:
;
;  1. source code distributions include the above copyright notice, this
;     list of conditions and the following disclaimer;
;
;  2. binary distributions include the above copyright notice, this list
;     of conditions and the following disclaimer in their documentation;
;
;  3. the name of the copyright holder is not used to endorse products
;     built using this software without specific written permission.
;
; DISCLAIMER
;
; This software is provided 'as is' with no explicit or implied warranties
; in respect of its properties, including, but not limited to, correctness
; and/or fitness for purpose.
; ---------------------------------------------------------------------------
; Issue 20/12/2007
;
; This code requires either ASM_X86_V2 or ASM_X86_V2C to be set in aesopt.h
; and the same define to be set here as well. If AES_V2C is set this file
; requires the C files aeskey.c and aestab.c for support.

; An AES implementation for x86 processors using the YASM (or NASM) assembler.
; This is a full assembler implementation covering encryption, decryption and
; key scheduling. It uses 2k bytes of tables but its encryption and decryption
; performance is very close to that obtained using large tables.  Key schedule
; expansion is slower for both encryption and decryption but this is likely to
; be offset by the much smaller load that this version places on the processor
; cache. I acknowledge the contribution made by Daniel Bernstein to aspects of
; the design of the AES round function used here.
;
; This code provides the standard AES block size (128 bits, 16 bytes) and the
; three standard AES key sizes (128, 192 and 256 bits). It has the same call
; interface as my C implementation. The ebx, esi, edi and ebp registers are
; preserved across calls but eax, ecx and edx and the artihmetic status flags
; are not.  Although this is a full assembler implementation, it can be used
; in conjunction with my C code which provides faster key scheduling using
; large tables. In this case aeskey.c should be compiled with ASM_X86_V2C
; defined.  It is also important that the defines below match those used in the
; C code.  This code uses the VC++ register saving conentions; if it is used
; with another compiler, conventions for using and saving registers may need
; to be checked (and calling conventions).  The YASM command line for the VC++
; custom build step is:
;
;    yasm -Xvc -f win32 -D <Z> -o "$(TargetDir)\$(InputName).obj" "$(InputPath)"
;
; For the cryptlib build this is (pcg):
;
;	yasm -Xvc -f win32 -D ASM_X86_V2C -o aescrypt2.obj aes_x86_v2.asm
;
; where <Z> is ASM_X86_V2 or ASM_X86_V2C.  The calling intefaces are:
;
;     AES_RETURN aes_encrypt(const unsigned char in_blk[],
;                   unsigned char out_blk[], const aes_encrypt_ctx cx[1]);
;
;     AES_RETURN aes_decrypt(const unsigned char in_blk[],
;                   unsigned char out_blk[], const aes_decrypt_ctx cx[1]);
;
;     AES_RETURN aes_encrypt_key<NNN>(const unsigned char key[],
;                                            const aes_encrypt_ctx cx[1]);
;
;     AES_RETURN aes_decrypt_key<NNN>(const unsigned char key[],
;                                            const aes_decrypt_ctx cx[1]);
;
;     AES_RETURN aes_encrypt_key(const unsigned char key[],
;                           unsigned int len, const aes_decrypt_ctx cx[1]);
;
;     AES_RETURN aes_decrypt_key(const unsigned char key[],
;                           unsigned int len, const aes_decrypt_ctx cx[1]);
;
; where <NNN> is 128, 102 or 256.  In the last two calls the length can be in
; either bits or bytes.

; The DLL interface must use the _stdcall convention in which the number
; of bytes of parameter space is added after an @ to the sutine's name.
; We must also remove our parameters from the stack before return (see
; the do_exit macro). Define DLL_EXPORT for the Dynamic Link Library version.

;
; Adapted for TrueCrypt:
; - All tables generated at run-time
; - Adapted for 16-bit environment
;

CPU 386
USE16
SEGMENT _TEXT PUBLIC CLASS=CODE USE16
SEGMENT _DATA PUBLIC CLASS=DATA USE16

GROUP DGROUP _TEXT _DATA

extern _aes_dec_tab		; Aestab.c
extern _aes_enc_tab

; %define DLL_EXPORT

; The size of the code can be reduced by using functions for the encryption
; and decryption rounds in place of macro expansion

%define REDUCE_CODE_SIZE

; Comment in/out the following lines to obtain the desired subroutines. These
; selections MUST match those in the C header file aes.h

; %define AES_128                 ; define if AES with 128 bit keys is needed
; %define AES_192                 ; define if AES with 192 bit keys is needed
%define AES_256                 ; define if AES with 256 bit keys is needed
; %define AES_VAR                 ; define if a variable key size is needed
%define ENCRYPTION              ; define if encryption is needed
%define DECRYPTION              ; define if decryption is needed
; %define AES_REV_DKS             ; define if key decryption schedule is reversed

%ifndef ASM_X86_V2C
%define ENCRYPTION_KEY_SCHEDULE ; define if encryption key expansion is needed
%define DECRYPTION_KEY_SCHEDULE ; define if decryption key expansion is needed
%endif

; The encryption key schedule has the following in memory layout where N is the
; number of rounds (10, 12 or 14):
;
; lo: | input key (round 0)  |  ; each round is four 32-bit words
;     | encryption round 1   |
;     | encryption round 2   |
;     ....
;     | encryption round N-1 |
; hi: | encryption round N   |
;
; The decryption key schedule is normally set up so that it has the same
; layout as above by actually reversing the order of the encryption key
; schedule in memory (this happens when AES_REV_DKS is set):
;
; lo: | decryption round 0   | =              | encryption round N   |
;     | decryption round 1   | = INV_MIX_COL[ | encryption round N-1 | ]
;     | decryption round 2   | = INV_MIX_COL[ | encryption round N-2 | ]
;     ....                       ....
;     | decryption round N-1 | = INV_MIX_COL[ | encryption round 1   | ]
; hi: | decryption round N   | =              | input key (round 0)  |
;
; with rounds except the first and last modified using inv_mix_column()
; But if AES_REV_DKS is NOT set the order of keys is left as it is for
; encryption so that it has to be accessed in reverse when used for
; decryption (although the inverse mix column modifications are done)
;
; lo: | decryption round 0   | =              | input key (round 0)  |
;     | decryption round 1   | = INV_MIX_COL[ | encryption round 1   | ]
;     | decryption round 2   | = INV_MIX_COL[ | encryption round 2   | ]
;     ....                       ....
;     | decryption round N-1 | = INV_MIX_COL[ | encryption round N-1 | ]
; hi: | decryption round N   | =              | encryption round N   |
;
; This layout is faster when the assembler key scheduling provided here
; is used.
;
; End of user defines

%ifdef AES_VAR
%ifndef AES_128
%define AES_128
%endif
%ifndef AES_192
%define AES_192
%endif
%ifndef AES_256
%define AES_256
%endif
%endif

%ifdef AES_VAR
%define KS_LENGTH       60
%elifdef AES_256
%define KS_LENGTH       60
%elifdef AES_192
%define KS_LENGTH       52
%else
%define KS_LENGTH       44
%endif

; These macros implement stack based local variables

%macro  save 2
    mov     [esp+4*%1],%2
%endmacro

%macro  restore 2
    mov     %1,[esp+4*%2]
%endmacro

%ifdef  REDUCE_CODE_SIZE
    %macro mf_call 1
        call %1
    %endmacro
%else
    %macro mf_call 1
        %1
    %endmacro
%endif

; the DLL has to implement the _stdcall calling interface on return
; In this case we have to take our parameters (3 4-byte pointers)
; off the stack

%define parms 12

%macro  do_name 1-2 parms
%ifndef DLL_EXPORT
    global  %1
%1:
%else
    global  %1@%2
    export  %1@%2
%1@%2:
%endif
%endmacro

%macro  do_call 1-2 parms
%ifndef DLL_EXPORT
    call    %1
    add     esp,%2
%else
    call    %1@%2
%endif
%endmacro

%macro  do_exit  0-1 parms
%ifdef DLL_EXPORT
    ret %1
%else
    ret
%endif
%endmacro

; finite field multiplies by {02}, {04} and {08}

%define f2(x)   ((x<<1)^(((x>>7)&1)*0x11b))
%define f4(x)   ((x<<2)^(((x>>6)&1)*0x11b)^(((x>>6)&2)*0x11b))
%define f8(x)   ((x<<3)^(((x>>5)&1)*0x11b)^(((x>>5)&2)*0x11b)^(((x>>5)&4)*0x11b))

; finite field multiplies required in table generation

%define f3(x)   (f2(x) ^ x)
%define f9(x)   (f8(x) ^ x)
%define fb(x)   (f8(x) ^ f2(x) ^ x)
%define fd(x)   (f8(x) ^ f4(x) ^ x)
%define fe(x)   (f8(x) ^ f4(x) ^ f2(x))

%define etab_0(x)   [_aes_enc_tab+4+8*x]
%define etab_1(x)   [_aes_enc_tab+3+8*x]
%define etab_2(x)   [_aes_enc_tab+2+8*x]
%define etab_3(x)   [_aes_enc_tab+1+8*x]
%define etab_b(x)   byte [_aes_enc_tab+1+8*x] ; used with movzx for 0x000000xx
%define etab_w(x)   word [_aes_enc_tab+8*x]   ; used with movzx for 0x0000xx00

%define btab_0(x)   [_aes_enc_tab+6+8*x]
%define btab_1(x)   [_aes_enc_tab+5+8*x]
%define btab_2(x)   [_aes_enc_tab+4+8*x]
%define btab_3(x)   [_aes_enc_tab+3+8*x]

; ROUND FUNCTION.  Build column[2] on ESI and column[3] on EDI that have the
; round keys pre-loaded. Build column[0] in EBP and column[1] in EBX.
;
; Input:
;
;   EAX     column[0]
;   EBX     column[1]
;   ECX     column[2]
;   EDX     column[3]
;   ESI     column key[round][2]
;   EDI     column key[round][3]
;   EBP     scratch
;
; Output:
;
;   EBP     column[0]   unkeyed
;   EBX     column[1]   unkeyed
;   ESI     column[2]   keyed
;   EDI     column[3]   keyed
;   EAX     scratch
;   ECX     scratch
;   EDX     scratch

%macro rnd_fun 2

    rol     ebx,16
    %1      esi, cl, 0, ebp
    %1      esi, dh, 1, ebp
    %1      esi, bh, 3, ebp
    %1      edi, dl, 0, ebp
    %1      edi, ah, 1, ebp
    %1      edi, bl, 2, ebp
    %2      ebp, al, 0, ebp
    shr     ebx,16
    and     eax,0xffff0000
    or      eax,ebx
    shr     edx,16
    %1      ebp, ah, 1, ebx
    %1      ebp, dh, 3, ebx
    %2      ebx, dl, 2, ebx
    %1      ebx, ch, 1, edx
    %1      ebx, al, 0, edx
    shr     eax,16
    shr     ecx,16
    %1      ebp, cl, 2, edx
    %1      edi, ch, 3, edx
    %1      esi, al, 2, edx
    %1      ebx, ah, 3, edx

%endmacro

; Basic MOV and XOR Operations for normal rounds

%macro  nr_xor  4
    movzx   %4,%2
    xor     %1,etab_%3(%4)
%endmacro

%macro  nr_mov  4
    movzx   %4,%2
    mov     %1,etab_%3(%4)
%endmacro

; Basic MOV and XOR Operations for last round

%if 1

    %macro  lr_xor  4
        movzx   %4,%2
        movzx   %4,etab_b(%4)
    %if %3 != 0
        shl     %4,8*%3
    %endif
        xor     %1,%4
    %endmacro

    %macro  lr_mov  4
        movzx   %4,%2
        movzx   %1,etab_b(%4)
    %if %3 != 0
        shl     %1,8*%3
    %endif
    %endmacro

%else       ; less effective but worth leaving as an option

    %macro  lr_xor  4
        movzx   %4,%2
        mov     %4,btab_%3(%4)
        and     %4,0x000000ff << 8 * %3
        xor     %1,%4
    %endmacro

    %macro  lr_mov  4
        movzx   %4,%2
        mov     %1,btab_%3(%4)
        and     %1,0x000000ff << 8 * %3
    %endmacro

%endif

; Apply S-Box to the 4 bytes in a 32-bit word and rotate byte positions

%ifdef REDUCE_CODE_SIZE

l3s_col:
    movzx   ecx,al              ; in      eax
    movzx   ecx, etab_b(ecx)    ; out     eax
    xor     edx,ecx             ; scratch ecx,edx
    movzx   ecx,ah
    movzx   ecx, etab_b(ecx)
    shl     ecx,8
    xor     edx,ecx
    shr     eax,16
    movzx   ecx,al
    movzx   ecx, etab_b(ecx)
    shl     ecx,16
    xor     edx,ecx
    movzx   ecx,ah
    movzx   ecx, etab_b(ecx)
    shl     ecx,24
    xor     edx,ecx
    mov     eax,edx
    ret

%else

%macro l3s_col 0

    movzx   ecx,al              ; in      eax
    movzx   ecx, etab_b(ecx)    ; out     eax
    xor     edx,ecx             ; scratch ecx,edx
    movzx   ecx,ah
    movzx   ecx, etab_b(ecx)
    shl     ecx,8
    xor     edx,ecx
    shr     eax,16
    movzx   ecx,al
    movzx   ecx, etab_b(ecx)
    shl     ecx,16
    xor     edx,ecx
    movzx   ecx,ah
    movzx   ecx, etab_b(ecx)
    shl     ecx,24
    xor     edx,ecx
    mov     eax,edx

%endmacro

%endif

; offsets to parameters

in_blk  equ     2   ; input byte array address parameter
out_blk equ     4   ; output byte array address parameter
ctx     equ     6   ; AES context structure
stk_spc equ    20   ; stack space

%ifdef  ENCRYPTION

; %define ENCRYPTION_TABLE

%ifdef REDUCE_CODE_SIZE

enc_round:
	sub		sp, 2
    add     ebp,16
    save    1,ebp
    mov     esi,[ebp+8]
    mov     edi,[ebp+12]

    rnd_fun nr_xor, nr_mov

    mov     eax,ebp
    mov     ecx,esi
    mov     edx,edi
    restore ebp,1
    xor     eax,[ebp]
    xor     ebx,[ebp+4]
	add		sp, 2
    ret

%else

%macro enc_round 0

    add     ebp,16
    save    0,ebp
    mov     esi,[ebp+8]
    mov     edi,[ebp+12]

    rnd_fun nr_xor, nr_mov

    mov     eax,ebp
    mov     ecx,esi
    mov     edx,edi
    restore ebp,0
    xor     eax,[ebp]
    xor     ebx,[ebp+4]

%endmacro

%endif

%macro enc_last_round 0

    add     ebp,16
    save    0,ebp
    mov     esi,[ebp+8]
    mov     edi,[ebp+12]

    rnd_fun lr_xor, lr_mov

    mov     eax,ebp
    restore ebp,0
    xor     eax,[ebp]
    xor     ebx,[ebp+4]

%endmacro

    section _TEXT

; AES Encryption Subroutine

    do_name _aes_encrypt,12

	mov		ax, sp
	movzx	esp, ax

    sub     esp,stk_spc
    mov     [esp+16],ebp
    mov     [esp+12],ebx
    mov     [esp+ 8],esi
    mov     [esp+ 4],edi

    movzx   esi,word [esp+in_blk+stk_spc] ; input pointer
    mov     eax,[esi   ]
    mov     ebx,[esi+ 4]
    mov     ecx,[esi+ 8]
    mov     edx,[esi+12]

    movzx   ebp,word [esp+ctx+stk_spc]    ; key pointer
    movzx   edi,byte [ebp+4*KS_LENGTH]
    xor     eax,[ebp   ]
    xor     ebx,[ebp+ 4]
    xor     ecx,[ebp+ 8]
    xor     edx,[ebp+12]

; determine the number of rounds

%ifndef AES_256
    cmp     edi,10*16
    je      .3
    cmp     edi,12*16
    je      .2
    cmp     edi,14*16
    je      .1
    mov     eax,-1
    jmp     .5
%endif

.1: mf_call enc_round
    mf_call enc_round
.2: mf_call enc_round
    mf_call enc_round
.3: mf_call enc_round
    mf_call enc_round
    mf_call enc_round
    mf_call enc_round
    mf_call enc_round
    mf_call enc_round
    mf_call enc_round
    mf_call enc_round
    mf_call enc_round
    enc_last_round

    movzx   edx,word [esp+out_blk+stk_spc]
    mov     [edx],eax
    mov     [edx+4],ebx
    mov     [edx+8],esi
    mov     [edx+12],edi
    xor     eax,eax

.5: mov     ebp,[esp+16]
    mov     ebx,[esp+12]
    mov     esi,[esp+ 8]
    mov     edi,[esp+ 4]
    add     esp,stk_spc
    do_exit 12

%endif

%macro f_key 2

    push    ecx
    push    edx
    mov     edx,esi
    ror     eax,8
    mf_call l3s_col
    mov     esi,eax
    pop     edx
    pop     ecx
    xor     esi,rc_val

    mov     [ebp+%1*%2],esi
    xor     edi,esi
    mov     [ebp+%1*%2+4],edi
    xor     ecx,edi
    mov     [ebp+%1*%2+8],ecx
    xor     edx,ecx
    mov     [ebp+%1*%2+12],edx
    mov     eax,edx

%if %2 == 24

%if %1 < 7
    xor     eax,[ebp+%1*%2+16-%2]
    mov     [ebp+%1*%2+16],eax
    xor     eax,[ebp+%1*%2+20-%2]
    mov     [ebp+%1*%2+20],eax
%endif

%elif %2 == 32

%if %1 < 6
    push    ecx
    push    edx
    mov     edx,[ebp+%1*%2+16-%2]
    mf_call l3s_col
    pop     edx
    pop     ecx
    mov     [ebp+%1*%2+16],eax
    xor     eax,[ebp+%1*%2+20-%2]
    mov     [ebp+%1*%2+20],eax
    xor     eax,[ebp+%1*%2+24-%2]
    mov     [ebp+%1*%2+24],eax
    xor     eax,[ebp+%1*%2+28-%2]
    mov     [ebp+%1*%2+28],eax
%endif

%endif

%assign rc_val f2(rc_val)

%endmacro

%ifdef ENCRYPTION_KEY_SCHEDULE

%ifdef  AES_128

%ifndef ENCRYPTION_TABLE
; %define ENCRYPTION_TABLE
%endif

%assign rc_val  1

    do_name _aes_encrypt_key128,8

    push    ebp
    push    ebx
    push    esi
    push    edi

    mov     ebp,[esp+24]
    mov     [ebp+4*KS_LENGTH],dword 10*16
    mov     ebx,[esp+20]

    mov     esi,[ebx]
    mov     [ebp],esi
    mov     edi,[ebx+4]
    mov     [ebp+4],edi
    mov     ecx,[ebx+8]
    mov     [ebp+8],ecx
    mov     edx,[ebx+12]
    mov     [ebp+12],edx
    add     ebp,16
    mov     eax,edx

    f_key   0,16        ; 11 * 4 = 44 unsigned longs
    f_key   1,16        ; 4 + 4 * 10 generated = 44
    f_key   2,16
    f_key   3,16
    f_key   4,16
    f_key   5,16
    f_key   6,16
    f_key   7,16
    f_key   8,16
    f_key   9,16

    pop     edi
    pop     esi
    pop     ebx
    pop     ebp
    xor     eax,eax
    do_exit  8

%endif

%ifdef  AES_192

%ifndef ENCRYPTION_TABLE
; %define ENCRYPTION_TABLE
%endif

%assign rc_val  1

    do_name _aes_encrypt_key192,8

    push    ebp
    push    ebx
    push    esi
    push    edi

    mov     ebp,[esp+24]
    mov     [ebp+4*KS_LENGTH],dword 12 * 16
    mov     ebx,[esp+20]

    mov     esi,[ebx]
    mov     [ebp],esi
    mov     edi,[ebx+4]
    mov     [ebp+4],edi
    mov     ecx,[ebx+8]
    mov     [ebp+8],ecx
    mov     edx,[ebx+12]
    mov     [ebp+12],edx
    mov     eax,[ebx+16]
    mov     [ebp+16],eax
    mov     eax,[ebx+20]
    mov     [ebp+20],eax
    add     ebp,24

    f_key   0,24        ; 13 * 4 = 52 unsigned longs
    f_key   1,24        ; 6 + 6 * 8 generated = 54
    f_key   2,24
    f_key   3,24
    f_key   4,24
    f_key   5,24
    f_key   6,24
    f_key   7,24

    pop     edi
    pop     esi
    pop     ebx
    pop     ebp
    xor     eax,eax
    do_exit  8

%endif

%ifdef  AES_256

%ifndef ENCRYPTION_TABLE
; %define ENCRYPTION_TABLE
%endif

%assign rc_val  1

    do_name _aes_encrypt_key256,8

	mov		ax, sp
	movzx	esp, ax

    push    ebp
    push    ebx
    push    esi
    push    edi

    movzx   ebp, word [esp+20] ; ks
    mov     [ebp+4*KS_LENGTH],dword 14 * 16
    movzx   ebx, word [esp+18] ; key

    mov     esi,[ebx]
    mov     [ebp],esi
    mov     edi,[ebx+4]
    mov     [ebp+4],edi
    mov     ecx,[ebx+8]
    mov     [ebp+8],ecx
    mov     edx,[ebx+12]
    mov     [ebp+12],edx
    mov     eax,[ebx+16]
    mov     [ebp+16],eax
    mov     eax,[ebx+20]
    mov     [ebp+20],eax
    mov     eax,[ebx+24]
    mov     [ebp+24],eax
    mov     eax,[ebx+28]
    mov     [ebp+28],eax
    add     ebp,32

    f_key   0,32        ; 15 * 4 = 60 unsigned longs
    f_key   1,32        ; 8 + 8 * 7 generated = 64
    f_key   2,32
    f_key   3,32
    f_key   4,32
    f_key   5,32
    f_key   6,32

    pop     edi
    pop     esi
    pop     ebx
    pop     ebp
    xor     eax,eax
    do_exit  8

%endif

%ifdef  AES_VAR

%ifndef ENCRYPTION_TABLE
; %define ENCRYPTION_TABLE
%endif

    do_name _aes_encrypt_key,12

    mov     ecx,[esp+4]
    mov     eax,[esp+8]
    mov     edx,[esp+12]
    push    edx
    push    ecx

    cmp     eax,16
    je      .1
    cmp     eax,128
    je      .1

    cmp     eax,24
    je      .2
    cmp     eax,192
    je      .2

    cmp     eax,32
    je      .3
    cmp     eax,256
    je      .3
    mov     eax,-1
    add     esp,8
    do_exit 12

.1: do_call _aes_encrypt_key128,8
    do_exit 12
.2: do_call _aes_encrypt_key192,8
    do_exit 12
.3: do_call _aes_encrypt_key256,8
    do_exit 12

%endif

%endif

%ifdef ENCRYPTION_TABLE

; S-box data - 256 entries

    section _DATA

%define u8(x)   0, x, x, f3(x), f2(x), x, x, f3(x)

_aes_enc_tab:
    db  u8(0x63),u8(0x7c),u8(0x77),u8(0x7b),u8(0xf2),u8(0x6b),u8(0x6f),u8(0xc5)
    db  u8(0x30),u8(0x01),u8(0x67),u8(0x2b),u8(0xfe),u8(0xd7),u8(0xab),u8(0x76)
    db  u8(0xca),u8(0x82),u8(0xc9),u8(0x7d),u8(0xfa),u8(0x59),u8(0x47),u8(0xf0)
    db  u8(0xad),u8(0xd4),u8(0xa2),u8(0xaf),u8(0x9c),u8(0xa4),u8(0x72),u8(0xc0)
    db  u8(0xb7),u8(0xfd),u8(0x93),u8(0x26),u8(0x36),u8(0x3f),u8(0xf7),u8(0xcc)
    db  u8(0x34),u8(0xa5),u8(0xe5),u8(0xf1),u8(0x71),u8(0xd8),u8(0x31),u8(0x15)
    db  u8(0x04),u8(0xc7),u8(0x23),u8(0xc3),u8(0x18),u8(0x96),u8(0x05),u8(0x9a)
    db  u8(0x07),u8(0x12),u8(0x80),u8(0xe2),u8(0xeb),u8(0x27),u8(0xb2),u8(0x75)
    db  u8(0x09),u8(0x83),u8(0x2c),u8(0x1a),u8(0x1b),u8(0x6e),u8(0x5a),u8(0xa0)
    db  u8(0x52),u8(0x3b),u8(0xd6),u8(0xb3),u8(0x29),u8(0xe3),u8(0x2f),u8(0x84)
    db  u8(0x53),u8(0xd1),u8(0x00),u8(0xed),u8(0x20),u8(0xfc),u8(0xb1),u8(0x5b)
    db  u8(0x6a),u8(0xcb),u8(0xbe),u8(0x39),u8(0x4a),u8(0x4c),u8(0x58),u8(0xcf)
    db  u8(0xd0),u8(0xef),u8(0xaa),u8(0xfb),u8(0x43),u8(0x4d),u8(0x33),u8(0x85)
    db  u8(0x45),u8(0xf9),u8(0x02),u8(0x7f),u8(0x50),u8(0x3c),u8(0x9f),u8(0xa8)
    db  u8(0x51),u8(0xa3),u8(0x40),u8(0x8f),u8(0x92),u8(0x9d),u8(0x38),u8(0xf5)
    db  u8(0xbc),u8(0xb6),u8(0xda),u8(0x21),u8(0x10),u8(0xff),u8(0xf3),u8(0xd2)
    db  u8(0xcd),u8(0x0c),u8(0x13),u8(0xec),u8(0x5f),u8(0x97),u8(0x44),u8(0x17)
    db  u8(0xc4),u8(0xa7),u8(0x7e),u8(0x3d),u8(0x64),u8(0x5d),u8(0x19),u8(0x73)
    db  u8(0x60),u8(0x81),u8(0x4f),u8(0xdc),u8(0x22),u8(0x2a),u8(0x90),u8(0x88)
    db  u8(0x46),u8(0xee),u8(0xb8),u8(0x14),u8(0xde),u8(0x5e),u8(0x0b),u8(0xdb)
    db  u8(0xe0),u8(0x32),u8(0x3a),u8(0x0a),u8(0x49),u8(0x06),u8(0x24),u8(0x5c)
    db  u8(0xc2),u8(0xd3),u8(0xac),u8(0x62),u8(0x91),u8(0x95),u8(0xe4),u8(0x79)
    db  u8(0xe7),u8(0xc8),u8(0x37),u8(0x6d),u8(0x8d),u8(0xd5),u8(0x4e),u8(0xa9)
    db  u8(0x6c),u8(0x56),u8(0xf4),u8(0xea),u8(0x65),u8(0x7a),u8(0xae),u8(0x08)
    db  u8(0xba),u8(0x78),u8(0x25),u8(0x2e),u8(0x1c),u8(0xa6),u8(0xb4),u8(0xc6)
    db  u8(0xe8),u8(0xdd),u8(0x74),u8(0x1f),u8(0x4b),u8(0xbd),u8(0x8b),u8(0x8a)
    db  u8(0x70),u8(0x3e),u8(0xb5),u8(0x66),u8(0x48),u8(0x03),u8(0xf6),u8(0x0e)
    db  u8(0x61),u8(0x35),u8(0x57),u8(0xb9),u8(0x86),u8(0xc1),u8(0x1d),u8(0x9e)
    db  u8(0xe1),u8(0xf8),u8(0x98),u8(0x11),u8(0x69),u8(0xd9),u8(0x8e),u8(0x94)
    db  u8(0x9b),u8(0x1e),u8(0x87),u8(0xe9),u8(0xce),u8(0x55),u8(0x28),u8(0xdf)
    db  u8(0x8c),u8(0xa1),u8(0x89),u8(0x0d),u8(0xbf),u8(0xe6),u8(0x42),u8(0x68)
    db  u8(0x41),u8(0x99),u8(0x2d),u8(0x0f),u8(0xb0),u8(0x54),u8(0xbb),u8(0x16)

%endif

%ifdef  DECRYPTION

; %define DECRYPTION_TABLE

%define dtab_0(x)   [_aes_dec_tab+  8*x]
%define dtab_1(x)   [_aes_dec_tab+3+8*x]
%define dtab_2(x)   [_aes_dec_tab+2+8*x]
%define dtab_3(x)   [_aes_dec_tab+1+8*x]
%define dtab_x(x)   byte [_aes_dec_tab+7+8*x]

%macro irn_fun 2

    rol eax,16
    %1      esi, cl, 0, ebp
    %1      esi, bh, 1, ebp
    %1      esi, al, 2, ebp
    %1      edi, dl, 0, ebp
    %1      edi, ch, 1, ebp
    %1      edi, ah, 3, ebp
    %2      ebp, bl, 0, ebp
    shr     eax,16
    and     ebx,0xffff0000
    or      ebx,eax
    shr     ecx,16
    %1      ebp, bh, 1, eax
    %1      ebp, ch, 3, eax
    %2      eax, cl, 2, ecx
    %1      eax, bl, 0, ecx
    %1      eax, dh, 1, ecx
    shr     ebx,16
    shr     edx,16
    %1      esi, dh, 3, ecx
    %1      ebp, dl, 2, ecx
    %1      eax, bh, 3, ecx
    %1      edi, bl, 2, ecx

%endmacro

; Basic MOV and XOR Operations for normal rounds

%macro  ni_xor  4
    movzx   %4,%2
    xor     %1,dtab_%3(%4)
%endmacro

%macro  ni_mov  4
    movzx   %4,%2
    mov     %1,dtab_%3(%4)
%endmacro

; Basic MOV and XOR Operations for last round

%macro  li_xor  4
    movzx   %4,%2
    movzx   %4,dtab_x(%4)
%if %3 != 0
    shl     %4,8*%3
%endif
    xor     %1,%4
%endmacro

%macro  li_mov  4
    movzx   %4,%2
    movzx   %1,dtab_x(%4)
%if %3 != 0
    shl     %1,8*%3
%endif
%endmacro

%ifdef REDUCE_CODE_SIZE

dec_round:
	sub		sp, 2
%ifdef AES_REV_DKS
    add     ebp,16
%else
    sub     ebp,16
%endif
    save    1,ebp
    mov     esi,[ebp+8]
    mov     edi,[ebp+12]

    irn_fun ni_xor, ni_mov

    mov     ebx,ebp
    mov     ecx,esi
    mov     edx,edi
    restore ebp,1
    xor     eax,[ebp]
    xor     ebx,[ebp+4]
    add		sp, 2
    ret

%else

%macro dec_round 0

%ifdef AES_REV_DKS
    add     ebp,16
%else
    sub     ebp,16
%endif
    save    0,ebp
    mov     esi,[ebp+8]
    mov     edi,[ebp+12]

    irn_fun ni_xor, ni_mov

    mov     ebx,ebp
    mov     ecx,esi
    mov     edx,edi
    restore ebp,0
    xor     eax,[ebp]
    xor     ebx,[ebp+4]

%endmacro

%endif

%macro dec_last_round 0

%ifdef AES_REV_DKS
    add     ebp,16
%else
    sub     ebp,16
%endif
    save    0,ebp
    mov     esi,[ebp+8]
    mov     edi,[ebp+12]

    irn_fun li_xor, li_mov

    mov     ebx,ebp
    restore ebp,0
    xor     eax,[ebp]
    xor     ebx,[ebp+4]

%endmacro

    section _TEXT

; AES Decryption Subroutine

    do_name _aes_decrypt,12

	mov		ax, sp
	movzx	esp, ax

    sub     esp,stk_spc
    mov     [esp+16],ebp
    mov     [esp+12],ebx
    mov     [esp+ 8],esi
    mov     [esp+ 4],edi

; input four columns and xor in first round key

    movzx   esi,word [esp+in_blk+stk_spc] ; input pointer
    mov     eax,[esi   ]
    mov     ebx,[esi+ 4]
    mov     ecx,[esi+ 8]
    mov     edx,[esi+12]
    lea     esi,[esi+16]

    movzx   ebp, word [esp+ctx+stk_spc]    ; key pointer
    movzx   edi,byte[ebp+4*KS_LENGTH]
%ifndef  AES_REV_DKS        ; if decryption key schedule is not reversed
    lea     ebp,[ebp+edi] ; we have to access it from the top down
%endif
    xor     eax,[ebp   ]  ; key schedule
    xor     ebx,[ebp+ 4]
    xor     ecx,[ebp+ 8]
    xor     edx,[ebp+12]

; determine the number of rounds

%ifndef AES_256
    cmp     edi,10*16
    je      .3
    cmp     edi,12*16
    je      .2
    cmp     edi,14*16
    je      .1
    mov     eax,-1
    jmp     .5
%endif

.1: mf_call dec_round
    mf_call dec_round
.2: mf_call dec_round
    mf_call dec_round
.3: mf_call dec_round
    mf_call dec_round
    mf_call dec_round
    mf_call dec_round
    mf_call dec_round
    mf_call dec_round
    mf_call dec_round
    mf_call dec_round
    mf_call dec_round
    dec_last_round

; move final values to the output array.

    movzx   ebp,word [esp+out_blk+stk_spc]
    mov     [ebp],eax
    mov     [ebp+4],ebx
    mov     [ebp+8],esi
    mov     [ebp+12],edi
    xor     eax,eax

.5: mov     ebp,[esp+16]
    mov     ebx,[esp+12]
    mov     esi,[esp+ 8]
    mov     edi,[esp+ 4]
    add     esp,stk_spc
    do_exit 12

%endif

%ifdef REDUCE_CODE_SIZE

inv_mix_col:
    movzx   ecx,dl          ; input  eax, edx
    movzx   ecx,etab_b(ecx) ; output eax
    mov     eax,dtab_0(ecx) ; used   ecx
    movzx   ecx,dh
    shr     edx,16
    movzx   ecx,etab_b(ecx)
    xor     eax,dtab_1(ecx)
    movzx   ecx,dl
    movzx   ecx,etab_b(ecx)
    xor     eax,dtab_2(ecx)
    movzx   ecx,dh
    movzx   ecx,etab_b(ecx)
    xor     eax,dtab_3(ecx)
    ret

%else

%macro  inv_mix_col 0

    movzx   ecx,dl          ; input  eax, edx
    movzx   ecx,etab_b(ecx) ; output eax
    mov     eax,dtab_0(ecx) ; used   ecx
    movzx   ecx,dh
    shr     edx,16
    movzx   ecx,etab_b(ecx)
    xor     eax,dtab_1(ecx)
    movzx   ecx,dl
    movzx   ecx,etab_b(ecx)
    xor     eax,dtab_2(ecx)
    movzx   ecx,dh
    movzx   ecx,etab_b(ecx)
    xor     eax,dtab_3(ecx)

%endmacro

%endif

%ifdef DECRYPTION_KEY_SCHEDULE

%ifdef AES_128

%ifndef DECRYPTION_TABLE
; %define DECRYPTION_TABLE
%endif

    do_name _aes_decrypt_key128,8

    push    ebp
    push    ebx
    push    esi
    push    edi
    mov     eax,[esp+24]    ; context
    mov     edx,[esp+20]    ; key
    push    eax
    push    edx
    do_call _aes_encrypt_key128,8   ; generate expanded encryption key
    mov     eax,10*16
    mov     esi,[esp+24]    ; pointer to first round key
    lea     edi,[esi+eax]   ; pointer to last round key
    add     esi,32
                            ; the inverse mix column transformation
    mov     edx,[esi-16]    ; needs to be applied to all round keys
    mf_call inv_mix_col     ; except first and last. Hence start by
    mov     [esi-16],eax    ; transforming the four sub-keys in the
    mov     edx,[esi-12]    ; second round key
    mf_call inv_mix_col
    mov     [esi-12],eax    ; transformations for subsequent rounds
    mov     edx,[esi-8]     ; can then be made more efficient by
    mf_call inv_mix_col     ; noting that for three of the four sub-keys
    mov     [esi-8],eax     ; in the encryption round key ek[r]:
    mov     edx,[esi-4]     ;
    mf_call inv_mix_col     ;   ek[r][n] = ek[r][n-1] ^ ek[r-1][n]
    mov     [esi-4],eax     ;
                            ; where n is 1..3. Hence the corresponding
.0: mov     edx,[esi]       ; subkeys in the decryption round key dk[r]
    mf_call inv_mix_col     ; also obey since inv_mix_col is linear in
    mov     [esi],eax       ; GF(256):
    xor     eax,[esi-12]    ;
    mov     [esi+4],eax     ;   dk[r][n] = dk[r][n-1] ^ dk[r-1][n]
    xor     eax,[esi-8]     ;
    mov     [esi+8],eax     ; So we only need one inverse mix column
    xor     eax,[esi-4]     ; operation (n = 0) for each four word cycle
    mov     [esi+12],eax    ; in the expanded key.
    add     esi,16
    cmp     edi,esi
    jg      .0
    jmp     dec_end

%endif

%ifdef AES_192

%ifndef DECRYPTION_TABLE
; %define DECRYPTION_TABLE
%endif

    do_name _aes_decrypt_key192,8

    push    ebp
    push    ebx
    push    esi
    push    edi
    mov     eax,[esp+24]    ; context
    mov     edx,[esp+20]    ; key
    push    eax
    push    edx
    do_call _aes_encrypt_key192,8   ; generate expanded encryption key
    mov     eax,12*16
    mov     esi,[esp+24]    ; first round key
    lea     edi,[esi+eax]   ; last round key
    add     esi,48          ; the first 6 words are the key, of
                            ; which the top 2 words are part of
    mov     edx,[esi-32]    ; the second round key and hence
    mf_call inv_mix_col     ; need to be modified. After this we
    mov     [esi-32],eax    ; need to do a further six values prior
    mov     edx,[esi-28]    ; to using a more efficient technique
    mf_call inv_mix_col     ; based on:
    mov     [esi-28],eax    ;
                            ; dk[r][n] = dk[r][n-1] ^ dk[r-1][n]
    mov     edx,[esi-24]    ;
    mf_call inv_mix_col     ; for n = 1 .. 5 where the key expansion
    mov     [esi-24],eax    ; cycle is now 6 words long
    mov     edx,[esi-20]
    mf_call inv_mix_col
    mov     [esi-20],eax
    mov     edx,[esi-16]
    mf_call inv_mix_col
    mov     [esi-16],eax
    mov     edx,[esi-12]
    mf_call inv_mix_col
    mov     [esi-12],eax
    mov     edx,[esi-8]
    mf_call inv_mix_col
    mov     [esi-8],eax
    mov     edx,[esi-4]
    mf_call inv_mix_col
    mov     [esi-4],eax

.0: mov     edx,[esi]       ; the expanded key is 13 * 4 = 44 32-bit words
    mf_call inv_mix_col     ; of which 11 * 4 = 44 have to be modified
    mov     [esi],eax       ; using inv_mix_col.  We have already done 8
    xor     eax,[esi-20]    ; of these so 36 are left - hence we need
    mov     [esi+4],eax     ; exactly 6 loops of six here
    xor     eax,[esi-16]
    mov     [esi+8],eax
    xor     eax,[esi-12]
    mov     [esi+12],eax
    xor     eax,[esi-8]
    mov     [esi+16],eax
    xor     eax,[esi-4]
    mov     [esi+20],eax
    add     esi,24
    cmp     edi,esi
    jg      .0
    jmp     dec_end

%endif

%ifdef AES_256

%ifndef DECRYPTION_TABLE
; %define DECRYPTION_TABLE
%endif

    do_name _aes_decrypt_key256,8

    mov		ax, sp
	movzx	esp, ax
    push    ebp
    push    ebx
    push    esi
    push    edi

    movzx   eax, word [esp+20] ; ks
    movzx   edx, word [esp+18] ; key
    push    ax
    push    dx
    do_call _aes_encrypt_key256,4   ; generate expanded encryption key
    mov     eax,14*16
    movzx   esi, word [esp+20] ; ks
    lea     edi,[esi+eax]
    add     esi,64

    mov     edx,[esi-48]    ; the primary key is 8 words, of which
    mf_call inv_mix_col     ; the top four require modification
    mov     [esi-48],eax
    mov     edx,[esi-44]
    mf_call inv_mix_col
    mov     [esi-44],eax
    mov     edx,[esi-40]
    mf_call inv_mix_col
    mov     [esi-40],eax
    mov     edx,[esi-36]
    mf_call inv_mix_col
    mov     [esi-36],eax

    mov     edx,[esi-32]    ; the encryption key expansion cycle is
    mf_call inv_mix_col     ; now eight words long so we need to
    mov     [esi-32],eax    ; start by doing one complete block
    mov     edx,[esi-28]
    mf_call inv_mix_col
    mov     [esi-28],eax
    mov     edx,[esi-24]
    mf_call inv_mix_col
    mov     [esi-24],eax
    mov     edx,[esi-20]
    mf_call inv_mix_col
    mov     [esi-20],eax
    mov     edx,[esi-16]
    mf_call inv_mix_col
    mov     [esi-16],eax
    mov     edx,[esi-12]
    mf_call inv_mix_col
    mov     [esi-12],eax
    mov     edx,[esi-8]
    mf_call inv_mix_col
    mov     [esi-8],eax
    mov     edx,[esi-4]
    mf_call inv_mix_col
    mov     [esi-4],eax

.0: mov     edx,[esi]       ; we can now speed up the remaining
    mf_call inv_mix_col     ; rounds by using the technique
    mov     [esi],eax       ; outlined earlier.  But note that
    xor     eax,[esi-28]    ; there is one extra inverse mix
    mov     [esi+4],eax     ; column operation as the 256 bit
    xor     eax,[esi-24]    ; key has an extra non-linear step
    mov     [esi+8],eax     ; for the midway element.
    xor     eax,[esi-20]
    mov     [esi+12],eax    ; the expanded key is 15 * 4 = 60
    mov     edx,[esi+16]    ; 32-bit words of which 52 need to
    mf_call inv_mix_col     ; be modified.  We have already done
    mov     [esi+16],eax    ; 12 so 40 are left - which means
    xor     eax,[esi-12]    ; that we need exactly 5 loops of 8
    mov     [esi+20],eax
    xor     eax,[esi-8]
    mov     [esi+24],eax
    xor     eax,[esi-4]
    mov     [esi+28],eax
    add     esi,32
    cmp     edi,esi
    jg      .0

%endif

dec_end:

%ifdef AES_REV_DKS

    movzx   esi,word [esp+20]	; this reverses the order of the
.1: mov     eax,[esi]			; round keys if required
    mov     ebx,[esi+4]
    mov     ebp,[edi]
    mov     edx,[edi+4]
    mov     [esi],ebp
    mov     [esi+4],edx
    mov     [edi],eax
    mov     [edi+4],ebx

    mov     eax,[esi+8]
    mov     ebx,[esi+12]
    mov     ebp,[edi+8]
    mov     edx,[edi+12]
    mov     [esi+8],ebp
    mov     [esi+12],edx
    mov     [edi+8],eax
    mov     [edi+12],ebx

    add     esi,16
    sub     edi,16
    cmp     edi,esi
    jg      .1

%endif

    pop     edi
    pop     esi
    pop     ebx
    pop     ebp
    xor     eax,eax
    do_exit  8

%ifdef AES_VAR

    do_name _aes_decrypt_key,12

    mov     ecx,[esp+4]
    mov     eax,[esp+8]
    mov     edx,[esp+12]
    push    edx
    push    ecx

    cmp     eax,16
    je      .1
    cmp     eax,128
    je      .1

    cmp     eax,24
    je      .2
    cmp     eax,192
    je      .2

    cmp     eax,32
    je      .3
    cmp     eax,256
    je      .3
    mov     eax,-1
    add     esp,8
    do_exit 12

.1: do_call _aes_decrypt_key128,8
    do_exit 12
.2: do_call _aes_decrypt_key192,8
    do_exit 12
.3: do_call _aes_decrypt_key256,8
    do_exit 12

%endif

%endif

%ifdef DECRYPTION_TABLE

; Inverse S-box data - 256 entries

    section _DATA

%define v8(x)   fe(x), f9(x), fd(x), fb(x), fe(x), f9(x), fd(x), x

_aes_dec_tab:
    db  v8(0x52),v8(0x09),v8(0x6a),v8(0xd5),v8(0x30),v8(0x36),v8(0xa5),v8(0x38)
    db  v8(0xbf),v8(0x40),v8(0xa3),v8(0x9e),v8(0x81),v8(0xf3),v8(0xd7),v8(0xfb)
    db  v8(0x7c),v8(0xe3),v8(0x39),v8(0x82),v8(0x9b),v8(0x2f),v8(0xff),v8(0x87)
    db  v8(0x34),v8(0x8e),v8(0x43),v8(0x44),v8(0xc4),v8(0xde),v8(0xe9),v8(0xcb)
    db  v8(0x54),v8(0x7b),v8(0x94),v8(0x32),v8(0xa6),v8(0xc2),v8(0x23),v8(0x3d)
    db  v8(0xee),v8(0x4c),v8(0x95),v8(0x0b),v8(0x42),v8(0xfa),v8(0xc3),v8(0x4e)
    db  v8(0x08),v8(0x2e),v8(0xa1),v8(0x66),v8(0x28),v8(0xd9),v8(0x24),v8(0xb2)
    db  v8(0x76),v8(0x5b),v8(0xa2),v8(0x49),v8(0x6d),v8(0x8b),v8(0xd1),v8(0x25)
    db  v8(0x72),v8(0xf8),v8(0xf6),v8(0x64),v8(0x86),v8(0x68),v8(0x98),v8(0x16)
    db  v8(0xd4),v8(0xa4),v8(0x5c),v8(0xcc),v8(0x5d),v8(0x65),v8(0xb6),v8(0x92)
    db  v8(0x6c),v8(0x70),v8(0x48),v8(0x50),v8(0xfd),v8(0xed),v8(0xb9),v8(0xda)
    db  v8(0x5e),v8(0x15),v8(0x46),v8(0x57),v8(0xa7),v8(0x8d),v8(0x9d),v8(0x84)
    db  v8(0x90),v8(0xd8),v8(0xab),v8(0x00),v8(0x8c),v8(0xbc),v8(0xd3),v8(0x0a)
    db  v8(0xf7),v8(0xe4),v8(0x58),v8(0x05),v8(0xb8),v8(0xb3),v8(0x45),v8(0x06)
    db  v8(0xd0),v8(0x2c),v8(0x1e),v8(0x8f),v8(0xca),v8(0x3f),v8(0x0f),v8(0x02)
    db  v8(0xc1),v8(0xaf),v8(0xbd),v8(0x03),v8(0x01),v8(0x13),v8(0x8a),v8(0x6b)
    db  v8(0x3a),v8(0x91),v8(0x11),v8(0x41),v8(0x4f),v8(0x67),v8(0xdc),v8(0xea)
    db  v8(0x97),v8(0xf2),v8(0xcf),v8(0xce),v8(0xf0),v8(0xb4),v8(0xe6),v8(0x73)
    db  v8(0x96),v8(0xac),v8(0x74),v8(0x22),v8(0xe7),v8(0xad),v8(0x35),v8(0x85)
    db  v8(0xe2),v8(0xf9),v8(0x37),v8(0xe8),v8(0x1c),v8(0x75),v8(0xdf),v8(0x6e)
    db  v8(0x47),v8(0xf1),v8(0x1a),v8(0x71),v8(0x1d),v8(0x29),v8(0xc5),v8(0x89)
    db  v8(0x6f),v8(0xb7),v8(0x62),v8(0x0e),v8(0xaa),v8(0x18),v8(0xbe),v8(0x1b)
    db  v8(0xfc),v8(0x56),v8(0x3e),v8(0x4b),v8(0xc6),v8(0xd2),v8(0x79),v8(0x20)
    db  v8(0x9a),v8(0xdb),v8(0xc0),v8(0xfe),v8(0x78),v8(0xcd),v8(0x5a),v8(0xf4)
    db  v8(0x1f),v8(0xdd),v8(0xa8),v8(0x33),v8(0x88),v8(0x07),v8(0xc7),v8(0x31)
    db  v8(0xb1),v8(0x12),v8(0x10),v8(0x59),v8(0x27),v8(0x80),v8(0xec),v8(0x5f)
    db  v8(0x60),v8(0x51),v8(0x7f),v8(0xa9),v8(0x19),v8(0xb5),v8(0x4a),v8(0x0d)
    db  v8(0x2d),v8(0xe5),v8(0x7a),v8(0x9f),v8(0x93),v8(0xc9),v8(0x9c),v8(0xef)
    db  v8(0xa0),v8(0xe0),v8(0x3b),v8(0x4d),v8(0xae),v8(0x2a),v8(0xf5),v8(0xb0)
    db  v8(0xc8),v8(0xeb),v8(0xbb),v8(0x3c),v8(0x83),v8(0x53),v8(0x99),v8(0x61)
    db  v8(0x17),v8(0x2b),v8(0x04),v8(0x7e),v8(0xba),v8(0x77),v8(0xd6),v8(0x26)
    db  v8(0xe1),v8(0x69),v8(0x14),v8(0x63),v8(0x55),v8(0x21),v8(0x0c),v8(0x7d)

%endif