amtal

Rel=fun(Vsn) ->
    release_handler:unpack_release("eg_"++Vsn),
    A = application:which_applications(),
    {ok,OldVsn,[]} = release_handler:install_release(Vsn),
    B = application:which_applications(),
    Delta = lists:zip(A--B,B--A),
    [{relup,OldVsn,Vsn}
    ,{appups,[{App,From,To}||{{App,_,From},{App,_,To}}<-Delta]}
    ]
end.

amtal

-module(fileop).
-export([write_file/3]).
-compile({parse_transform,do}).

%% Uses an error monad to neatly compose a bunch of failing functions.
%%
%% Everything being composed returns ok|{ok,Result}|{error,Reason}. At
%% the first error, the reason term is returned. The monad factors out
%% the behaviour of piping all possible errors to the output (via a 
%% try-throw or case tree) if they occur.

amtal

-module(rpn).
-export([eval/1, hypotenuse/2]).
-compile({parse_transform,do}).

-spec eval([Op]) -> stack_m(ok).
%% Interpreter for a simple stack-based language.
%%
%% Uses a custom stack_m monad, which is a trivial wrapper around state_m[1].
%% It exports:
%%  -spec pop() -> stack_m(A).

amtal

-- | Complete abstract description of the DCPU-16 instruction set.
--
-- Based on Version 1.1 of the DCPU-16 Specification by Mojang, retrieved from 0x10c.com.
--
-- Contains a trivial "Label" extension, which isn't present in machine code
-- but is useful for dealing with assembly.
module DCPU16.Instructions where
import Data.Word hiding (Word)
import Data.ByteString

amtal

; Code Obfuscator
;
; The loader has nice properties shorter versions don't:
; 1. doesn't touch registers or stack
; 2. can be based anywhere via 'set a,stub'
; 3. exercises interpreters ;)
:stub           xor [begin],0x5eed
                mul [2+a],25173        ; Grogono LCG
                add [2+a],13849
                add [1+a],1

amtal

augur@niflheim:~/code/c/weird$ xxd -c12 -g4 -s8 dump.bin  | more
0000008: 204a442e 20666f72 20496e74   JD. for Int
0000014: 656c2043 6f726520 32204475  el Core 2 Du
0000020: 6f205435 3735300d 0a286329  o T5750..(c)
000002c: 2053656c 656e612f 2f323030   Selena//200
0000038: 372c2032 30303800 2b000000  7, 2008.+...
0000044: 05000000 26000000 3e000000  ....&...>...
0000050: 47020000 e7fdffff 00000000  G...........
000005c: a3ffffff a7ffffff 01000000  ............
0000068: 02000000 0a000000 02000000  ............

amtal

# based on http://www.nsa.gov/public_info/_files/tech_journals/communications_extraterrestrial_intelligence.pdf
# two related documents I know of:
#  just message, shorter alphabet, longer: http://www.nsa.gov/public_info/_files/tech_journals/extraterrestrial_intelligence.pdf
#  solutions: http://www.nsa.gov/public_info/_files/tech_journals/extraterrestrial_messages.pdf
"""
 (1) A. B. C. D. E. F. G. H. I. J. K. L. M. N. O. P. Q. R. S. T. U. V. W. X. Y.
     Z. *. &. $. ^. #. @.       A. B. C. D. E. F. G. H. I. J. K. L. M. N. O. P.
     Q. R. S. T. U. V. W. X. Y. Z. *. &. $. ^. #. @.
 (2) A A, B; A A A, C; A A A A, D; A A A A A, E; A A A A A A, F;
     A A A A A A A, G; A A A A A A A A, H; A A A A A A A A A, I;

amtal

#!/usr/bin/env python3
"""Usage: vimcrypt.py [FILE]...

Guesses first 64 bytes of vim-encrypted files. Method implemented is sufficient
for plain English (preferably with lots of spaces), but any knowledge of
underlying plaintext would do.

Example:

$ ./vimcrypt.py 1.txt 2.txt 3.txt 4.txt

amtal

"""Looking for collisions in Mooltipass "TRNG" output.

The "TRNG" outputs 32 bit blocks whitened with Jenkins one at a time hash,
keeping no state between samples. Running ent or diehard on the output stream
produces a predictable "pass" result, since these tests do not take the 32 bit
block structure into account.

Excessive collisions found by the following test would disprove the null
hypothesis that each 32 bit sample from the "TRNG" is uniformly distributed.

amtal

"""Poke interesting instructions from Python.

Uses the nifty trick in https://github.com/AmihaiN/pyAsm to run snippets then
inspect registers. (Use at own risk, nasm.exe source not verified, etc.)
"""
from pyAsm import pyAsm, A_32BIT
        
def regs(reg, sep='\n', txt=''):
    txt = txt.strip()
    acc = []