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Some operations are not supported with Curve25519

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This commit is contained in:
Manuel Pégourié-Gonnard
2013-12-04 20:52:04 +01:00
parent 3d7053a2bb
commit 97871ef236
3 changed files with 20 additions and 0 deletions
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6
library/ecp.c
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@@ -946,6 +946,9 @@ int ecp_add( const ecp_group *grp, ecp_point *R,
{
int ret;
if( ecp_is_montgomery( grp ) )
return( POLARSSL_ERR_ECP_FEATURE_UNAVAILABLE );
MPI_CHK( ecp_add_mixed( grp, R, P, Q ) );
MPI_CHK( ecp_normalize_jac( grp, R ) );
@@ -965,6 +968,9 @@ int ecp_sub( const ecp_group *grp, ecp_point *R,
ecp_point_init( &mQ );
if( ecp_is_montgomery( grp ) )
return( POLARSSL_ERR_ECP_FEATURE_UNAVAILABLE );
/* mQ = - Q */
ecp_copy( &mQ, Q );
if( mpi_cmp_int( &mQ.Y, 0 ) != 0 )