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zip.asm
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zip.asm
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; a nasm source to defines a dual ZIP for MD5 collisions
; build with `nasm -o zip.zip zip.asm`
; Ange Albertini 2018
BITS 32
%include "zip.inc"
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; Replace File 1 and 2 values.
; reminder: incbin "<file>", <start>, <size>
; File 1
%macro file1.name 0
db 'hello.txt'
%endmacro
%macro file1.content 0
%%start:
db 'Hello World!', 0ah
file1.compsize equ $ - %%start
%endmacro
file1.compression equ COMP_STORED
file1.decsize equ file1.compsize
file1.CRC32 equ 0x7d14dddd
; File 2
%macro file2.name 0
db 'bye.txt'
%endmacro
%macro file2.content 0
%%start:
db 'Bye World!', 0ah
file2.compsize equ $ - %%start
%endmacro
file2.compression equ COMP_STORED
file2.decsize equ file2.compsize
file2.CRC32 equ 0xcedb178e
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
file2:
istruc filerecord
at filerecord.frSignature, db "PK", 3, 4
at filerecord.frVersion, dw 0ah
at filerecord.frCompression, dw file2.compression
at filerecord.frCrc, dd file2.CRC32
at filerecord.frCompressedSize, dd file2.compsize
at filerecord.frUncompressedSize, dd file2.decsize
at filerecord.frFileNameLength, dw lfhname2.len
at filerecord.frExtraFieldLength, dw extra2.len
iend
lfhname2:
file2.name
lfhname2.len equ $ - lfhname2
extra2:
field2:
.id dw 0
.len dw extra2.len - 4
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
file1:
istruc filerecord
at filerecord.frSignature, db "PK", 3, 4
at filerecord.frVersion, dw 0ah
at filerecord.frCompression, dw file1.compression
at filerecord.frCrc, dd file1.CRC32
at filerecord.frCompressedSize, dd file1.compsize
at filerecord.frUncompressedSize, dd file1.decsize
at filerecord.frFileNameLength, dw lfhname1.len
at filerecord.frExtraFieldLength, dw extra1.len
iend
lfhname1:
file1.name
lfhname1.len equ $ - lfhname1
extra1:
field1:
.id dw 0
.len dw extra1.len - 4
extra2.len equ $ - extra2
data2:
file2.content
data2.len equ $ - data2
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
CD2:
istruc direntry
at direntry.deSignature, db "PK", 1, 2
at direntry.deVersionToExtract, dw 0ah
at direntry.deCrc, dd file2.CRC32
at direntry.deCompressedSize, dd data2.len
at direntry.deUncompressedSize, dd data2.len
at direntry.deFileNameLength, dw cdname2.len
at direntry.deFileCommentLength,dw cdcom2.len
at direntry.deHeaderOffset, dd file2
iend
cdname2:
file2.name
.len equ $ - cdname2
cdcom2:
db 0 ; truncating
extra1.len equ $ - extra1
data1:
file1.content
data1.len equ $ - data1
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
CD1:
istruc direntry
at direntry.deSignature, db "PK", 1, 2
at direntry.deVersionToExtract, dw 0ah
at direntry.deCrc, dd file1.CRC32
at direntry.deCompressedSize, dd data1.len
at direntry.deUncompressedSize, dd data1.len
at direntry.deFileNameLength, dw cdname1.len
at direntry.deFileCommentLength,dw cdcom1.len
at direntry.deHeaderOffset, dd file1
iend
cdname1:
file1.name
cdname1.len equ $ - cdname1
cdcom1:
db 0 ; truncating
align 40h, db 0 ; to align EoCD1 for first collision
cdcom1.len equ $ - cdcom1
CD1.len equ $ - CD1
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
EoCD1:
istruc endlocator
at endlocator.elSignature, db "PK", 5, 0x06
at endlocator.elEntriesOnDisk, db 1
at endlocator.elEntriesInDirectory, db 1
at endlocator.elDirectorySize, dd CD1.len
at endlocator.elDirectoryOffset, dd CD1
at endlocator.elCommentLength, dw EoCD1com.len
iend
EoCD1com:
db 0 ; truncating
align 4, db 'M' ; UniColl prefix
align 40h, db 0 ; end of first collision block
; second collision block
db 0
align 40h, db 0
cdcom2.len equ $ - cdcom2
CD2.len equ $ - CD2
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
EoCD2:
istruc endlocator
at endlocator.elSignature, db "PK", 5, 0x86 ; 0x06/0x86 because of UniColl
at endlocator.elEntriesOnDisk, db 1
at endlocator.elEntriesInDirectory, db 1
at endlocator.elDirectorySize, dd CD2.len
at endlocator.elDirectoryOffset, dd CD2
at endlocator.elCommentLength, dw EoCD2com.len
iend
EoCD2com:
db 0 ; truncating
align 4, db 'M' ; Unicoll prefix
align 40h, db 0 ; end of first collision block
; second collision block
db 0
align 40h, db 0
EoCD2com.len equ $ - EoCD2com
EoCD1com.len equ $ - EoCD1com