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Date: Wed, 12 Mar 2014 21:42:47 +0100
From: Pavol Rusnak <stick@gk2.sk>
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To: William Yager <will.yager@gmail.com>
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Cc: Bitcoin Dev <bitcoin-development@lists.sourceforge.net>
Subject: Re: [Bitcoin-development] [RFC] Proposal: Base58 encoded HD Wallet
 root key with optional encryption
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On 03/12/2014 09:37 PM, William Yager wrote:
> (that group of people includes me), PBKDF2-HMAC-SHA512 is very easy to
> implement even on devices that only have a few kB of RAM, and even though
> our number of rounds is very aggressive (2^16 and 2^21), it will still run
> in reasonable time even on very slow embedded ARM processors.

To give you some numbers: TREZOR (120MHz ARM) does 1024 rounds of
PBKDF2-HMAC-SHA512 in around 1 second.

So 2^16 is around one minute, 2^21 is around half an hour.

-- 
Best Regards / S pozdravom,

Pavol Rusnak <stick@gk2.sk>