* [Bitcoin-development] Bip 32 Question
@ 2015-06-12 18:22 James Poole
2015-06-12 19:42 ` William Swanson
0 siblings, 1 reply; 2+ messages in thread
From: James Poole @ 2015-06-12 18:22 UTC (permalink / raw)
To: bitcoin-development
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Looking at the BIP32 definition, I hit a line that I would appreciate
clarification on.
https://github.com/bitcoin/bips/blob/master/bip-0032.mediawiki
Under the section "Private parent key → private child key" there is a step:
"The returned child key ki is parse256(IL) + kpar (mod n)."
Can someone help me understand what "n" is in the context of this
algorithm? I very well could be looking right at it, but wanted to double
check if I am missing something.
Thanks,
James
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^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [Bitcoin-development] Bip 32 Question
2015-06-12 18:22 [Bitcoin-development] Bip 32 Question James Poole
@ 2015-06-12 19:42 ` William Swanson
0 siblings, 0 replies; 2+ messages in thread
From: William Swanson @ 2015-06-12 19:42 UTC (permalink / raw)
To: James Poole; +Cc: Bitcoin Dev
The `n` is the curve order, as shown here:
https://en.bitcoin.it/wiki/Secp256k1
This step is necessary to keep you on the curve. The
secp256k1_ec_privkey_tweak_add function from libsecp256k1 handles this
automatically, but if you use OpenSSL or some non-EC math library, you
probably have to do it yourself.
-William
On Fri, Jun 12, 2015 at 11:22 AM, James Poole <james@microtrx•com> wrote:
> Looking at the BIP32 definition, I hit a line that I would appreciate
> clarification on.
>
> https://github.com/bitcoin/bips/blob/master/bip-0032.mediawiki
>
> Under the section "Private parent key → private child key" there is a step:
>
> "The returned child key ki is parse256(IL) + kpar (mod n)."
>
> Can someone help me understand what "n" is in the context of this algorithm?
> I very well could be looking right at it, but wanted to double check if I am
> missing something.
>
> Thanks,
> James
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