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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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8
library/ecdsa.c
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@ -59,6 +59,10 @@ int ecdsa_sign( ecp_group *grp, mpi *r, mpi *s,
ecp_point R;
mpi k, e;
/* Fail cleanly on curves such as Curve25519 that can't be used for ECDSA */
if( grp->N.p == NULL )
return( POLARSSL_ERR_ECP_BAD_INPUT_DATA );
ecp_point_init( &R );
mpi_init( &k );
mpi_init( &e );
@ -129,6 +133,10 @@ int ecdsa_verify( ecp_group *grp,
ecp_point_init( &R ); ecp_point_init( &P );
mpi_init( &e ); mpi_init( &s_inv ); mpi_init( &u1 ); mpi_init( &u2 );
/* Fail cleanly on curves such as Curve25519 that can't be used for ECDSA */
if( grp->N.p == NULL )
return( POLARSSL_ERR_ECP_BAD_INPUT_DATA );
/*
* Step 1: make sure r and s are in range 1..n-1
*/