On 20 December 2013 09:09, Patrick McCorry [hidden email] wrote:
Thanks Guys,
At the moment I'm trying to distinguish if n p, as the x co-ordinate
does not wrap around n (so x = r in all cases) - to verify if this is
always the case
n can be greater than p, e.g. see the definition of
On 28 February 2014 17:07, Paddy stonecold...@gmail.com wrote:
On 20 December 2013 09:09, Patrick McCorry [hidden email] wrote:
Thanks Guys,
At the moment I'm trying to distinguish if n p, as the x co-ordinate
does not wrap around n (so x = r in all cases) - to verify if this is
always the
My understanding is that k . G = (x,y)
And under the hood, 0 = x = p and 0 = y = p.
Then the next step I believe is r = x mod n and NOT r = x mod p
So in this case, because p n - then x will wrap around the modulus from
time to time?
Otherwise, if it is r = x mod p, then x will never
Thanks Guys,
At the moment I'm trying to distinguish if n p, as the x co-ordinate does not
wrap around n (so x = r in all cases) - to verify if this is always the case
Sent from my iPad
On 20 Dec 2013, at 04:16, Billy Brumley bbrum...@gmail.com wrote:
... yet it seems you are free to use
On 20 December 2013 09:09, Patrick McCorry stonecold...@gmail.com wrote:
Thanks Guys,
At the moment I'm trying to distinguish if n p, as the x co-ordinate does
not wrap around n (so x = r in all cases) - to verify if this is always the
case
n can be greater than p, e.g. see the
http://en.wikipedia.org/wiki/Elliptic_Curve_DSA
order in the code you pasted = n in the wiki = N in your mail.
The code you pasted refers to GFp so the points (x,y) satisfy 0 = x
p and 0 = y p. That's probably what you mean by q. Anyway, it's
used in the underlying elliptic curve operations
Thank you Billy for the clarification - is there a way to retrieve the value
for p that is used under the hood? I assume the p value does not change
(unless the curve is changed).
Sent from my iPhone
On 19 Dec 2013, at 17:35, Billy Brumley bbrum...@gmail.com wrote:
It's in the EC_GROUP structure: group-field. Check crypto/ec/ec_lcl.h. BBB
On Thu, Dec 19, 2013 at 9:54 AM, Patrick McCorry stonecold...@gmail.com wrote:
Thank you Billy for the clarification - is there a way to retrieve the value
for p that is used under the hood? I assume the p value does
On 19 December 2013 18:52, Billy Brumley bbrum...@gmail.com wrote:
It's in the EC_GROUP structure: group-field. Check crypto/ec/ec_lcl.h. BBB
Anything in the *lcl.h header files does not form part of the public
API and you shouldn't really rely on it as it may change.
Better is to use:
int
... yet it seems you are free to use it as you please (like the rest
of the library does) internally, so it depends on what you are doing.
(Modifying the library or creating an application -- since you posted
code snippets I assumed the former, Matt points out the proper way
externally.)
BBB
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