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From: Michael Wozniak <mw@osfda.org>
In-Reply-To: <lq39p1$gff$1@ger.gmane.org>
Date: Tue, 15 Jul 2014 09:32:01 -0400
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To: Andreas Schildbach <andreas@schildbach.de>
Cc: bitcoin-development@lists.sourceforge.net
Subject: Re: [Bitcoin-development] BIP 38 NFC normalisation issue
Precedence: list

I have a python implementation that seems to pass this test vector:

https://github.com/wozz/electrum/blob/bip38_import/lib/bip38.py#L299



On Jul 15, 2014, at 9:19 AM, Andreas Schildbach <andreas@schildbach.de> =
wrote:

> I think generally control-characters (such as \u0000) should be
> disallowed in passphrases. (Even the use of whitespaces is very
> questionable.)
>=20
> I'm ok with allowing pile-of-poo's. On mobile phones there is =
keyboards
> just containing emoticons -- why not allow those? Assuming NFC works =
of
> course.
>=20
>=20
> On 07/15/2014 03:07 PM, Eric Winer wrote:
>> I don't know for sure if the test vector is correct NFC form.  But =
for
>> what it's worth, the Pile of Poo character is pretty easily =
accessible
>> on the iPhone and Android keyboards, and in this string it's already =
in
>> NFC form (f09f92a9 in the test result).  I've certainly seen it in
>> usernames around the internet, and wouldn't be surprised to see it in
>> passphrases entered on smartphones, especially if the author of a
>> BIP38-compatible app includes a (possibly ill-advised) suggestion to
>> have your passphrase "include special characters".
>>=20
>> I haven't seen the NULL character on any smartphone keyboards, though =
-
>> I assume the iOS and Android developers had the foresight to know how
>> much havoc that would wreak on systems assuming null-terminated =
strings.
>> It seems unlikely that NULL would be in a real-world passphrase =
entered
>> by a sane user.
>>=20
>>=20
>> On Tue, Jul 15, 2014 at 8:03 AM, Mike Hearn <mike@plan99.net
>> <mailto:mike@plan99.net>> wrote:
>>=20
>>    [+cc aaron]
>>=20
>>    We recently added an implementation of BIP 38 (password protected
>>    private keys) to bitcoinj. It came to my attention that the third
>>    test vector may be broken. It gives a hex version of what the NFC
>>    normalised version of the input string should be, but this does =
not
>>    match the results of the Java unicode normaliser, and in fact I
>>    can't even get Python to print the names of the characters past =
the
>>    embedded null. I'm curious where this normalised version came =
from.
>>=20
>>    Given that "pile of poo" is not a character I think any sane user
>>    would put into a passphrase, I question the value of this test
>>    vector. NFC form is intended to collapse things like umlaut =
control
>>    characters onto their prior code point, but here we're feeding the
>>    algorithm what is basically garbage so I'm not totally surprised
>>    that different implementations appear to disagree on the outcome.
>>=20
>>    Proposed action: we remove this test vector as it does not =
represent
>>    any real world usage of the spec, or if we desperately need to
>>    verify NFC normalisation I suggest using a different, more =
realistic
>>    test string, like Z=C3=BCrich, or something written in Thai.
>>=20
>>=20
>>=20
>>    Test 3:
>>=20
>>      * Passphrase =CF=92=CC=81=E2=90=80=F0=90=90=80=F0=9F=92=A9 =
(\u03D2\u0301\u0000\U00010400\U0001F4A9; GREEK
>>        UPSILON WITH HOOK <http://codepoints.net/U+03D2>, COMBINING
>>        ACUTE ACCENT <http://codepoints.net/U+0301>, NULL
>>        <http://codepoints.net/U+0000>, DESERET CAPITAL LETTER LONG I
>>        <http://codepoints.net/U+10400>, PILE OF POO
>>        <http://codepoints.net/U+1F4A9>)
>>      * Encrypted key:
>>        6PRW5o9FLp4gJDDVqJQKJFTpMvdsSGJxMYHtHaQBF3ooa8mwD69bapcDQn
>>      * Bitcoin Address: 16ktGzmfrurhbhi6JGqsMWf7TyqK9HNAeF
>>      * Unencrypted private key (WIF):
>>        5Jajm8eQ22H3pGWLEVCXyvND8dQZhiQhoLJNKjYXk9roUFTMSZ4
>>      * /Note:/ The non-standard UTF-8 characters in this passphrase
>>        should be NFC normalized to result in a passphrase
>>        of0xcf9300f0909080f09f92a9 before further processing
>>=20
>>=20
>>=20
>>=20
>>    =
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>>=20
>>=20
>>=20
>>=20
>> =
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>>=20
>>=20
>>=20
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>>=20
>=20
>=20
>=20
> =
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