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fixed goppa generator creation

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This commit is contained in:
Mirek Kratochvil 2012-04-10 09:27:35 +02:00
parent 6ee3e86dc4
commit eeed801a0c
1 changed files with 6 additions and 5 deletions
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11
lib/matrix.cpp
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@ -129,10 +129,10 @@ bool matrix::strip_left_square (matrix&r)
bool matrix::get_right_square (matrix&r) bool matrix::get_right_square (matrix&r)
{ {
uint h = height(); uint h = height(), w = width();
if (width() < h) return false; if (w < h) return false;
r.resize (h); r.resize (h);
for (uint i = 0; i < h; ++i) r[i] = item (h + i); for (uint i = 0; i < h; ++i) r[i] = item (w - h + i);
return true; return true;
} }
@ -169,12 +169,13 @@ bool matrix::create_goppa_generator (matrix&g, const permutation&p)
{ {
matrix t, sinv, s; matrix t, sinv, s;
//generator construction from Barreto's PQC-4 slides p.21
p.permute (*this, t); p.permute (*this, t);
t.get_left_square (sinv); t.get_right_square (sinv);
if (!sinv.compute_inversion (s) ) return false; //meant to be retried. if (!sinv.compute_inversion (s) ) return false; //meant to be retried.
s.mult (t); s.mult (t);
s.strip_left_square (t); //matrix pingpong. optimize it. s.strip_right_square (t); //matrix pingpong for the result
t.compute_transpose (s); t.compute_transpose (s);
s.extend_left_compact (g); s.extend_left_compact (g);
return true; return true;