Erlang interface to libcrack.

## HOW TO BUILD IT

```
apt-get install libcrack2-dev
rebar3 compile
```

## HOW TO USE IT

```
check(Password) -> ok | {error, string()}
    Types   Password = [ binary() | string() ]

quality(Password) -> #passwd_quality{}

has(Type, Stats) -> true | false
    Types   Type = [ upper | lower | number | other ]
            Stats = #passwd_quality{}

has(Type, Stats, Min) -> true | false
    Types   Type = [ upper | lower | number | other ]
            Stats = #passwd_quality{}
            Min = integer()
```

## EXAMPLES

```
1> cerck:check(<<"foobar">>).
{error,"it is based on a dictionary word"}
2> cerck:check(<<"f00b4r">>).
ok
```

For quality checks:

```
1> rr("include/cerck.hrl").
[passwd_quality]
2> S = cerck:quality(<<"f00b4r">>).
#passwd_quality{upper = 0,lower = 3,number = 3,other = 0}
3> cerck:has(number, S).
true
4> cerck:has(other, S).
false
```

## TODO

* do all of this in pure Erlang