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|
module ia32/elf/begin.sts
module cipher.sts
defword checktext
1
exit
defword keygen
drop 31 32 33 3
exit
set_entry
; read file into stack
0 do sys_read 0 = until
swap 1 +
od drop as length
local ciphertext
0 ; initial key is empty
do
; generate next key to try
keygen as keylen local key
; decipher text (length is the same as for ciphertext)
keylen 1 - length do 1 -
as textpos local pos
textpos word_size mul ciphertext + @
key
keylen
pos
cipher
swap textpos
dup 0 = untilod drop drop
local plaintext
; check deciphering attempt, exit if Ok
length checktext until
; else remove the text from stack and place keylen back
0 do dup length = until
swap drop 1 +
od drop keylen
od
; output text (todo: and language)
length do 1 -
dup word_size mul plaintext + @ sys_write
dup 0 = untilod
sys_exit
module ia32/elf/end.sts
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