NAME

Crypt::ECDSA::Curve::Koblitz -- binary (F(2**N)) curves for EC cryptography

DESCRIPTION

These are for use with Crypt::ECDSA and require Math::BigInt::GMP.

METHODS

new

Delegated to base class Crypt::ECDSA::Curve

multiply_F2m

Binary field multiplication

invert_F2m

Binary field inversion: used for binary field division, so that
  $x * $y             becomes 
  $x * invert_F2m($y)

is_on_curve

return 1 if (x, y) is on the curve, otherwise undef.

add_on_curve

Add a point on the curve to itself or another

subtract_on_curve

Subtract a point on the curve.  Same as addition.

double_on_curve

Double a point on the curve.   
Returns a new point, does NOT change the original.

inverse_on_curve

get a point's additive inverse

multiply_on_curve

my $Q = $G * n;

Multiply a curve point by a scalar.  
Note this should always be Point * scalar, not scalar * Point.

is_weak_curve

tests for known weak curve parameters

from_octet

Constructs a Point from an ASN.1 octet (compressed or uncompressed formats)  

to_octet

Converts the Point into an ASN.1 octet format

FUNCTIONS

equation

Return ascii string representation of the field equation

BUGS

Windows compatibility needs work. Some of this is the GMP library.

AUTHOR

William Herrera B<wherrera@skylightview.com>. 

SUPPORT

Questions, feature requests and bug reports should go to <wherrera@skylightview.com>.

COPYRIGHT

Copyright (c) 2007 William Herrera. All rights reserved. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.