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Multiplication by negative is now forbidden

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Manuel Pégourié-Gonnard 2012-11-11 14:33:59 +01:00 • committed by Paul Bakker
parent 8433824d5f
commit 4bdd47d2cb
4 changed files with 29 additions and 20 deletions
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13
library/ecp.c
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@ -709,19 +709,24 @@ cleanup:
}
/*
* Integer multiplication: R = m * P (GECC 5.7, SPA-resistant variant)
* Integer multiplication: R = m * P (GECC 5.7, SPA-resistant)
*/
int ecp_mul( const ecp_group *grp, ecp_point *R,
const mpi *m, const ecp_point *P )
{
int ret;
int ret, cmp;
size_t pos;
ecp_ptjac Q[2];
cmp = mpi_cmp_int( m, 0 );
if( cmp < 0 )
return( POLARSSL_ERR_ECP_GENERIC );
/*
* The general method works only for m >= 1
* The general method works only for m != 0
*/
if( mpi_cmp_int( m, 0 ) == 0 ) {
if( cmp == 0 ) {
ecp_set_zero( R );
return( 0 );
}