NAME

Steemit::ECDSA - perl library wich implements ecda helper methods used by the Steemit::WsClient distribution

SYNOPSIS

   use Steemit::ECDSA;

   my ( $r, $s, $i ) = Steemit::ECDSA::ecdsa_sign( $message, Math::BigInt->from_bytes( $plain_secret_key) );

   my $pubkey = Steemit::ECDSA::recoverPubKey($message, $r, $s, $i )

   Steemit::ECDSA::ecdsa_verify( $message, $pubkey, $r, $s) or die "invalid signature";

SUBROUTINES/METHODS

is_signature_canonical_canonical($binary_signature)

accepts a binary representation of ($i+27+4).$r.$s and will check for a canonical signature its internaly used and canonical signatures are important for security, and enforced by teh server

bytes_32_sha256 {

take a message and return the 32 most significant bytes from the scha256 hash

calcPubKeyRecoveryParam {

internaly used to determine the parameter that lets us recalculate the public key from the signature

recoverPubKey {

recover the signature

get_compressed_public_key {

transform the x and y based coordinates from a public key to only teh x and a parameter wich defines whether y is even or odd

get_recovery_factor {

get the parameter needed by the above method

point_from_x {

get the point on the curve wich coresponds to a point x and a recovery factor

recover_y {

get only the y coorinate of the point

get_public_key_point {

take a key and get the public key for it as point

REPOSITORY

https://github.com/snkoehn/perlSteemit

AUTHOR

snkoehn, <snkoehn at cpan.org>

BUGS

Please report any bugs or feature requests to bug-steemit at rt.cpan.org, or through the web interface at http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Steemit::WsClient. I will be notified, and then you'll automatically be notified of progress on your bug as I make changes.

SUPPORT

You can find documentation for this module with the perldoc command.

    perldoc Steemit::ECDSA

You can also look for information at:

ACKNOWLEDGEMENTS

LICENSE AND COPYRIGHT

Copyright 2018 snkoehn.

This program is free software; you can redistribute it and/or modify it under the terms of the the Artistic License (2.0). You may obtain a copy of the full license at:

http://www.perlfoundation.org/artistic_license_2_0

Any use, modification, and distribution of the Standard or Modified Versions is governed by this Artistic License. By using, modifying or distributing the Package, you accept this license. Do not use, modify, or distribute the Package, if you do not accept this license.

If your Modified Version has been derived from a Modified Version made by someone other than you, you are nevertheless required to ensure that your Modified Version complies with the requirements of this license.

This license does not grant you the right to use any trademark, service mark, tradename, or logo of the Copyright Holder.

This license includes the non-exclusive, worldwide, free-of-charge patent license to make, have made, use, offer to sell, sell, import and otherwise transfer the Package with respect to any patent claims licensable by the Copyright Holder that are necessarily infringed by the Package. If you institute patent litigation (including a cross-claim or counterclaim) against any party alleging that the Package constitutes direct or contributory patent infringement, then this Artistic License to you shall terminate on the date that such litigation is filed.

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