Message-ID: <4E845B09.8040400@justmoon.de>
Date: Thu, 29 Sep 2011 13:48:25 +0200
From: Stefan Thomas <moon@justmoon.de>
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Subject: Re: [Bitcoin-development] Deprecating "midstate" in getwork?
Precedence: list

BitcoinJS uses OpenSSL to calculate midstate:

https://github.com/bitcoinjs/node-bitcoin-p2p/blob/master/native.cc#L380


On 9/29/2011 1:40 PM, Nils Schneider wrote:
> Yes, that's possible and what
> https://github.com/bitcoin/bitcoin/pull/535 does. However, deprecating
> midstate (and hash1) would allow for much cleaner code.
>
> A pull request for marking midstate (and hash1) as deprecated can be
> found at https://github.com/bitcoin/bitcoin/pull/538
>
> On 29.09.2011 12:23, John Smith wrote:
>> Nils,
>>
>> Sounds good. I'm also doubtful of depending on two crypto libraries when
>> OpenSSL does perfectly well.
>>
>> However, losing compatibility with miners is not very nice. Is there
>> really not a way to compute midstate with OpenSSL?
>>
>> JS
>>
>> On Mon, Sep 26, 2011 at 7:42 PM, Nils Schneider<nils@nilsschneider.net
>> <mailto:nils@nilsschneider.net>>  wrote:
>>
>>      Hey,
>>
>>      I'd like to simplify the internal reference miner and remove all
>>      dependencies on cryptopp (it's the only place we use cryptopp instead of
>>      OpenSSL).
>>
>>      Unfortunately, cryptopp is also used to calculate getwork "midstate".
>>      This field is redundant and the miner could easily calculate it from the
>>      blockheader so I'd like to remove it.
>>
>>      Any thoughts? Where should such a change should be announced so all
>>      miners can be upgraded?
>>
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>
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> http://p.sf.net/sfu/splunk-d2dcopy1
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