User talk:Hkdtam: Difference between revisions

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:: There were no errors in your code! Your translation from 'Go' was faithful and accurate. No bugs were fixed in my revision, I was just fussing around with the style of the code, as described in my github notes. The reason I replaced the output section was it was the easiest way to show how it looked with fewer digits of precision. thundergnat++ looked at my changes and pointed out how to use an 'anonymous container' to avoid creating a useless temporary variable. RC is all about learning... --[[User:SqrtNegInf|SqrtNegInf]] ([[User talk:SqrtNegInf|talk]]) 20:42, 28 January 2020 (UTC)

== Regarding "Elliptic Curve Digital Signature Algorithm" ==

Have you looked at trying the [https://modules.raku.org/search/?q=Digest%3A%3ASHA256%3A%3ANative Digest::SHA256::Native] module? It is a high speed C based implementation and should be much faster than the pure Perl 6 Digest::SHA. It would let you replace the lines:

my \z = :16((sha256 msg).list>>.&{"%02s".sprintf(.base(16))}.join) % $.n;

with

my \z = :16(sha256-hex msg) % $.n;

getting the same results, and should be much faster besides.

Also, the constants block

our (\A,\B,\P,\O,\Gx,\Gy) = (0, 7, # https://en.bitcoin.it/wiki/Secp256k1

:10("0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFC2F"),

:10("0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141"),

:10("0x79BE667EF9DCBBAC55A06295CE870B07029BFCDB2DCE28D959F2815B16F81798"),

:10("0x483ADA7726A3C4655DA4FBFC0E1108A8FD17B448A68554199C47D08FFB10D4B8"));

would be better written as:

our (\A,\B,\P,\O,\Gx,\Gy) = 0, 7, # https://en.bitcoin.it/wiki/Secp256k1

0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFC2F,

0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141,

0x79BE667EF9DCBBAC55A06295CE870B07029BFCDB2DCE28D959F2815B16F81798,

0x483ADA7726A3C4655DA4FBFC0E1108A8FD17B448A68554199C47D08FFB10D4B8;

They are already integers, albeit expressed in hexadecimal, no need to convert to strings and then re-interpret them.

Thanks for adding this! --[[User:Thundergnat|Thundergnat]] ([[User talk:Thundergnat|talk]]) 23:27, 24 February 2020 (UTC)