Andreas Schildbach [ARCHIVE] on Nostr: 📅 Original date posted:2014-07-17 📝 Original message:Here is a good article ...

📅 Original date posted:2014-07-17
📝 Original message:Here is a good article that helped me with what's going wrong:

http://www.oracle.com/technetwork/articles/javase/supplementary-142654.html

Basically, Java is stuck at 16 bits per char due to legacy reasons. They
admit that for a new language, they would probably use 32 (or 24?) bits
per char.

\u literals express UTF-16 encoding, so you have to use 16 bits. I
learned that for codepoint 0x010400, I could write "\uD801\uDC00", which
is the UTF-16 encoding of that codepoint.

Other languages have literals for codepoints. E.g. Python can use
u"\U00010400" or HTML has 𐐀 Unfortunately, Java is missing such
a construct (at least in Java6).


On 07/17/2014 12:59 PM, Mike Hearn wrote:
> Glad we got to the bottom of that. That's quite a nasty
> compiler/language bug I must say. Not even a warning. Still, python
> crashes when trying to print the name of a null character. It wouldn't
> surprise me if there are other weird issues lurking. Would definitely
> sleep better with a more restricted character set.
>
> On 17 Jul 2014 00:04, "Andreas Schildbach" <andreas at schildbach.de
> <mailto:andreas at schildbach.de>> wrote:
>
> Please excuse me. I had a more thorough look at the original problem and
> found that the only problem with the original test case was that you
> cannot specify codepoints from the SMP using \u in Java. I always tried
> \u010400 but that doesn't work.
>
> Here is a fix for bitcoinj. The test now passes.
>
> https://github.com/bitcoinj/bitcoinj/pull/143
>
> We can (and probably should) still need to filter control chars, I'll
> have a look at that now again.
>
>
> On 07/16/2014 11:06 PM, Aaron Voisine wrote:
> > If I first remove \u0000, so the non-normalized passphrase is
> > "\u03D2\u0301\U00010400\U0001F4A9", and then NFC normalize it, it
> > becomes "\u03D3\U00010400\U0001F4A9"
> >
> > UTF-8 encoded this is: 0xcf93f0909080f09f92a9 (not the same as what
> > you got, Andreas!)
> >
> > Encoding private key:
> 5Jajm8eQ22H3pGWLEVCXyvND8dQZhiQhoLJNKjYXk9roUFTMSZ4
> > with this passphrase, I get a BIP38 key of:
> > 6PRW5o9FMb4hAYRQPmgcvVDTyDtr6R17VMXGLmvKjKVpGkYhBJ4uYuR9wZ
> >
> > I recommend rather than simply removing control characters from the
> > password that instead the spec require that passwords containing
> > control characters are invalid. We don't want people trying to be
> > clever and putting them in thinking they are adding to the password
> > entropy.
> >
> > Also for UI compatibility across many platforms, I'm also in favor
> > disallowing any character below U+0020 (space)
> >
> > I can submit a PR once we figure out why Andreas's passphrase was
> > different than what I got.
> >
> > Aaron Voisine
> > breadwallet.com <http://breadwallet.com>;
> >
> >
> > On Wed, Jul 16, 2014 at 4:04 AM, Andreas Schildbach
> > <andreas at schildbach.de <mailto:andreas at schildbach.de>> wrote:
> >> Damn, I just realized that I implement only the decoding side of
> BIP38.
> >> So I cannot propose a complete test vector. Here is what I have:
> >>
> >>
> >> Passphrase: ϓ␀𐐀💩 (\u03D2\u0301\u0000\U00010400\U0001F4A9; GREEK
> >> UPSILON WITH HOOK, COMBINING ACUTE ACCENT, NULL, DESERET CAPITAL
> LETTER
> >> LONG I, PILE OF POO)
> >>
> >> Passphrase bytes after removing ISO control characters and NFC
> >> normalization: 0xcf933034303066346139
> >>
> >> Bitcoin Address: 16ktGzmfrurhbhi6JGqsMWf7TyqK9HNAeF
> >>
> >> Unencrypted private key (WIF):
> >> 5Jajm8eQ22H3pGWLEVCXyvND8dQZhiQhoLJNKjYXk9roUFTMSZ4
> >>
> >>
> >> Can someone calculate the encrypted key from it (using whatever
> >> implementation) and I will verify it decodes properly in bitcoinj?
> >>
> >>
> >>
> >> On 07/16/2014 12:46 PM, Andreas Schildbach wrote:
> >>> I will change the bitcoinj implementation and propose a new test
> vector.
> >>>
> >>>
> >>>
> >>> On 07/16/2014 11:29 AM, Mike Hearn wrote:
> >>>> Yes sorry, you're right, the issue starts with the null code point.
> >>>> Python seems to have problems starting there too. It might work
> if we
> >>>> took that out.
> >>>>
> >>>>
> >>>> On Wed, Jul 16, 2014 at 11:17 AM, Andreas Schildbach
> >>>> <andreas at schildbach.de <mailto:andreas at schildbach.de>
> <mailto:andreas at schildbach.de <mailto:andreas at schildbach.de>>> wrote:
> >>>>
> >>>> Guys, you are always talking about the Unicode astral
> plane, but in fact
> >>>> its a plain old (ASCII) control character where this
> problem starts and
> >>>> likely ends: \u0000.
> >>>>
> >>>> Let's ban/filter ISO control characters and be done with
> it. Most
> >>>> control characters will never be enterable by any keyboard
> into a
> >>>> password field. Of course I assume that
> Character.isISOControl() works
> >>>> consistently across platforms.
> >>>>
> >>>>
> http://docs.oracle.com/javase/7/docs/api/java/lang/Character.html#isISOControl%28char%29
> >>>>
> >>>>
> >>>> On 07/16/2014 12:23 AM, Aaron Voisine wrote:
> >>>> > If the user creates a password on an iOS device with an
> astral
> >>>> > character and then can't enter that password on a JVM
> wallet, that
> >>>> > sucks. If JVMs really can't support unicode NFC then
> that's a strong
> >>>> > case to limit the spec to the subset of unicode that all
> popular
> >>>> > platforms can support, but it sounds like it might just
> be a JVM
> >>>> > string library bug that could hopefully be reported and
> fixed. I get
> >>>> > the same result as in the test case using apple's
> >>>> > CFStringNormalize(passphrase, kCFStringNormalizationFormC);
> >>>> >
> >>>> > Aaron Voisine
> >>>> > breadwallet.com <http://breadwallet.com>;
> <http://breadwallet.com>;
> >>>> >
> >>>> >
> >>>> > On Tue, Jul 15, 2014 at 11:20 AM, Mike Hearn
> <mike at plan99.net <mailto:mike at plan99.net>
> >>>> <mailto:mike at plan99.net <mailto:mike at plan99.net>>> wrote:
> >>>> >> Yes, we know, Andreas' code is indeed doing normalisation.
> >>>> >>
> >>>> >> However it appears the output bytes end up being
> different. What
> >>>> I get back
> >>>> >> is:
> >>>> >>
> >>>> >> cf930001303430300166346139
> >>>> >>
> >>>> >> vs
> >>>> >>
> >>>> >> cf9300f0909080f09f92a9
> >>>> >>
> >>>> >> from the spec.
> >>>> >>
> >>>> >> I'm not sure why. It appears this is due to the
> character from
> >>>> the astral
> >>>> >> planes. Java is old and uses 16 bit characters
> internally - it
> >>>> wouldn't
> >>>> >> surprise me if there's some weirdness that means it
> doesn't/won't
> >>>> support
> >>>> >> this kind of thing.
> >>>> >>
> >>>> >> I recommend instead that any implementation that wishes
> to be
> >>>> compatible
> >>>> >> with JVM based wallets (I suspect Android is the same) just
> >>>> refuse any
> >>>> >> passphrase that includes characters outside the BMP. At
> least
> >>>> unless someone
> >>>> >> can find a fix. I somehow doubt this will really hurt
> anyone.
> >>>> >>
> >>>> >>
> >>>>
> ------------------------------------------------------------------------------
> >>>> >> Want fast and easy access to all the code in your
> enterprise?
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> >>>> >> search on Ohloh, the Black Duck Open Hub! Try it now.
> >>>> >> http://p.sf.net/sfu/bds
> >>>> >> _______________________________________________
> >>>> >> Bitcoin-development mailing list
> >>>> >> Bitcoin-development at lists.sourceforge.net
> <mailto:Bitcoin-development at lists.sourceforge.net>
> >>>> <mailto:Bitcoin-development at lists.sourceforge.net
> <mailto:Bitcoin-development at lists.sourceforge.net>>
> >>>> >>
> https://lists.sourceforge.net/lists/listinfo/bitcoin-development
> >>>> >>
> >>>> >
> >>>> >
> >>>>
> ------------------------------------------------------------------------------
> >>>> > Want fast and easy access to all the code in your enterprise?
> >>>> Index and
> >>>> > search up to 200,000 lines of code with a free copy of
> Black Duck
> >>>> > Code Sight - the same software that powers the world's
> largest code
> >>>> > search on Ohloh, the Black Duck Open Hub! Try it now.
> >>>> > http://p.sf.net/sfu/bds
> >>>> >
> >>>>
> >>>>
> >>>>
> >>>>
> ------------------------------------------------------------------------------
> >>>> Want fast and easy access to all the code in your
> enterprise? Index and
> >>>> search up to 200,000 lines of code with a free copy of
> Black Duck
> >>>> Code Sight - the same software that powers the world's
> largest code
> >>>> search on Ohloh, the Black Duck Open Hub! Try it now.
> >>>> http://p.sf.net/sfu/bds
> >>>> _______________________________________________
> >>>> Bitcoin-development mailing list
> >>>> Bitcoin-development at lists.sourceforge.net
> <mailto:Bitcoin-development at lists.sourceforge.net>
> >>>> <mailto:Bitcoin-development at lists.sourceforge.net
> <mailto:Bitcoin-development at lists.sourceforge.net>>
> >>>>
> https://lists.sourceforge.net/lists/listinfo/bitcoin-development
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
> ------------------------------------------------------------------------------
> >>>> Want fast and easy access to all the code in your enterprise?
> Index and
> >>>> search up to 200,000 lines of code with a free copy of Black Duck
> >>>> Code Sight - the same software that powers the world's largest code
> >>>> search on Ohloh, the Black Duck Open Hub! Try it now.
> >>>> http://p.sf.net/sfu/bds
> >>>>
> >>>>
> >>>>
> >>>> _______________________________________________
> >>>> Bitcoin-development mailing list
> >>>> Bitcoin-development at lists.sourceforge.net
> <mailto:Bitcoin-development at lists.sourceforge.net>
> >>>> https://lists.sourceforge.net/lists/listinfo/bitcoin-development
> >>>>
> >>>
> >>>
> >>>
> >>>
> ------------------------------------------------------------------------------
> >>> Want fast and easy access to all the code in your enterprise?
> Index and
> >>> search up to 200,000 lines of code with a free copy of Black Duck
> >>> Code Sight - the same software that powers the world's largest code
> >>> search on Ohloh, the Black Duck Open Hub! Try it now.
> >>> http://p.sf.net/sfu/bds
> >>>
> >>
> >>
> >>
> >>
> ------------------------------------------------------------------------------
> >> Want fast and easy access to all the code in your enterprise?
> Index and
> >> search up to 200,000 lines of code with a free copy of Black Duck
> >> Code Sight - the same software that powers the world's largest code
> >> search on Ohloh, the Black Duck Open Hub! Try it now.
> >> http://p.sf.net/sfu/bds
> >> _______________________________________________
> >> Bitcoin-development mailing list
> >> Bitcoin-development at lists.sourceforge.net
> <mailto:Bitcoin-development at lists.sourceforge.net>
> >> https://lists.sourceforge.net/lists/listinfo/bitcoin-development
> >
> >
> ------------------------------------------------------------------------------
> > Want fast and easy access to all the code in your enterprise?
> Index and
> > search up to 200,000 lines of code with a free copy of Black Duck
> > Code Sight - the same software that powers the world's largest code
> > search on Ohloh, the Black Duck Open Hub! Try it now.
> > http://p.sf.net/sfu/bds
> > _______________________________________________
> > Bitcoin-development mailing list
> > Bitcoin-development at lists.sourceforge.net
> <mailto:Bitcoin-development at lists.sourceforge.net>
> > https://lists.sourceforge.net/lists/listinfo/bitcoin-development
> >
>
>
>
> ------------------------------------------------------------------------------
> Want fast and easy access to all the code in your enterprise? Index and
> search up to 200,000 lines of code with a free copy of Black Duck
> Code Sight - the same software that powers the world's largest code
> search on Ohloh, the Black Duck Open Hub! Try it now.
> http://p.sf.net/sfu/bds
> _______________________________________________
> Bitcoin-development mailing list
> Bitcoin-development at lists.sourceforge.net
> <mailto:Bitcoin-development at lists.sourceforge.net>
> https://lists.sourceforge.net/lists/listinfo/bitcoin-development
>
>
>
> ------------------------------------------------------------------------------
> Want fast and easy access to all the code in your enterprise? Index and
> search up to 200,000 lines of code with a free copy of Black Duck
> Code Sight - the same software that powers the world's largest code
> search on Ohloh, the Black Duck Open Hub! Try it now.
> http://p.sf.net/sfu/bds
>
>
>
> _______________________________________________
> Bitcoin-development mailing list
> Bitcoin-development at lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/bitcoin-development
>