Created
January 28, 2013 08:48
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-module(crack). | |
-export([crack/0]). | |
-compile(export_all). | |
-define(CHAR_LIST, "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVW"). | |
crack() -> | |
TryLength = 5, | |
MD5Hash = crypto:md5("12345"), | |
Lol = lists:duplicate(TryLength, ?CHAR_LIST), | |
{Divs, Mods, _Factor} = lists:foldl( | |
fun(I, {Dividends, Moduli, LastFactor}) -> | |
Length = length(lists:nth(I+1, Lol)), | |
{[Dividends,LastFactor], [Moduli,Length], LastFactor * Length} | |
end, | |
{[],[], 1}, | |
lists:seq(length(Lol)-1,0,-1) | |
), | |
FlatDivs = lists:flatten(Divs), | |
FlatMods = lists:flatten(Mods), | |
Products = round(math:pow(length(?CHAR_LIST), TryLength)), | |
tail_recurse(Products, {Lol, FlatDivs, FlatMods}, MD5Hash). | |
tail_recurse(0, {N, Lol, FlatDivs, FlatMods}, MD5Hash) -> | |
Product = nthProduct(N, Lol, FlatDivs, FlatMods), | |
check_md5(Product, MD5Hash); | |
tail_recurse(N, {Lol, FlatDivs, FlatMods}, MD5Hash) -> | |
Product = nthProduct(N, Lol, FlatDivs, FlatMods), | |
check_md5(Product, MD5Hash), | |
tail_recurse(N - 1, {Lol, FlatDivs, FlatMods}, MD5Hash). | |
check_md5(Product, MD5Hash) -> | |
case crypto:md5(Product) == MD5Hash of | |
true -> | |
io:format("found product: ~p~n",[lists:flatten(Product)]); | |
_ -> | |
ok | |
end. | |
nthProduct(N, Lol, Dividends, Moduli) -> | |
{Product, _, _, _, _} = lists:foldl( | |
fun fold_product/2, | |
{ [], Dividends, Moduli, Lol, N }, | |
lists:seq(1, length(Lol)) | |
), | |
Product. | |
fold_product(_I, { Acc, [ Div | NewDivs ], [Mod | NewMods], [ List | NewLol ], N}) -> | |
Position = floor(round(N/Div) rem Mod), | |
Char = lists:nth(Position+1, List), | |
{ [Acc, Char], NewDivs, NewMods, NewLol, N }. | |
floor(X) -> | |
T = erlang:trunc(X), | |
case (X - T) of | |
Neg when Neg < 0 -> T - 1; | |
Pos when Pos > 0 -> T; | |
_ -> T | |
end. |
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