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From: Aaron Voisine <voisine@gmail.com>
To: Mike Hearn <mike@plan99.net>
Cc: Bitcoin Dev <bitcoin-development@lists.sourceforge.net>
Subject: Re: [Bitcoin-development] BIP 38 NFC normalisation issue
Date: Tue, 15 Jul 2014 15:23:13 -0700	[thread overview]
Message-ID: <CACq0ZD5qTc-2f+puPaXMDFZNWUx8kvOZQMxqkM_e4YafhTW7cA@mail.gmail.com> (raw)
In-Reply-To: <CANEZrP3E2mdvOUHiW9W_hM3Z_kn9um8E6aX5vf-S9tA7KgnpUQ@mail.gmail.com>

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


On Tue, Jul 15, 2014 at 11:20 AM, Mike Hearn <mike@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.
>
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  reply	other threads:[~2014-07-15 22:23 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-07-15 12:03 [Bitcoin-development] BIP 38 NFC normalisation issue Mike Hearn
2014-07-15 13:07 ` Eric Winer
2014-07-15 13:19   ` Andreas Schildbach
2014-07-15 13:32     ` Michael Wozniak
2014-07-15 15:13   ` Brooks Boyd
2014-07-15 18:20     ` Mike Hearn
2014-07-15 22:23       ` Aaron Voisine [this message]
2014-07-16  9:12         ` Mike Hearn
2014-07-16  9:17         ` Andreas Schildbach
2014-07-16  9:29           ` Mike Hearn
2014-07-16 10:46             ` Andreas Schildbach
2014-07-16 11:04               ` Andreas Schildbach
2014-07-16 21:06                 ` Aaron Voisine
2014-07-16 22:02                   ` Andreas Schildbach
2014-07-16 22:22                     ` Andreas Schildbach
2014-07-17 10:59                     ` Mike Hearn
2014-07-17 11:27                       ` Andreas Schildbach
2014-07-16 12:38             ` Wladimir
2014-07-15 15:17   ` Jeff Garzik
2014-07-15 15:20     ` Mike Hearn
2014-07-15 15:32     ` Andreas Schildbach
2014-07-15 15:53       ` Jeff Garzik

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