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Fixed memory leak in ecdsa_sign() / ecdsa_verify() in case of error

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This commit is contained in:
Paul Bakker 2013-07-26 14:20:53 +02:00
parent 1e6a175362
commit cca998a4c5
1 changed files with 18 additions and 5 deletions
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23
library/ecdsa.c
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@ -75,7 +75,10 @@ int ecdsa_sign( const ecp_group *grp, mpi *r, mpi *s,
MPI_CHK( mpi_copy( r, &R.X ) ); MPI_CHK( mpi_copy( r, &R.X ) );
if( key_tries++ > 10 ) if( key_tries++ > 10 )
return( POLARSSL_ERR_ECP_GENERIC ); {
ret = POLARSSL_ERR_ECP_GENERIC;
goto cleanup;
}
} }
while( mpi_cmp_int( r, 0 ) == 0 ); while( mpi_cmp_int( r, 0 ) == 0 );
@ -94,7 +97,10 @@ int ecdsa_sign( const ecp_group *grp, mpi *r, mpi *s,
MPI_CHK( mpi_mod_mpi( s, s, &grp->N ) ); MPI_CHK( mpi_mod_mpi( s, s, &grp->N ) );
if( sign_tries++ > 10 ) if( sign_tries++ > 10 )
return( POLARSSL_ERR_ECP_GENERIC ); {
ret = POLARSSL_ERR_ECP_GENERIC;
goto cleanup;
}
} }
while( mpi_cmp_int( s, 0 ) == 0 ); while( mpi_cmp_int( s, 0 ) == 0 );
@ -127,7 +133,8 @@ int ecdsa_verify( const ecp_group *grp,
if( mpi_cmp_int( r, 1 ) < 0 || mpi_cmp_mpi( r, &grp->N ) >= 0 || if( mpi_cmp_int( r, 1 ) < 0 || mpi_cmp_mpi( r, &grp->N ) >= 0 ||
mpi_cmp_int( s, 1 ) < 0 || mpi_cmp_mpi( s, &grp->N ) >= 0 ) mpi_cmp_int( s, 1 ) < 0 || mpi_cmp_mpi( s, &grp->N ) >= 0 )
{ {
return( POLARSSL_ERR_ECP_BAD_INPUT_DATA ); ret = POLARSSL_ERR_ECP_BAD_INPUT_DATA;
goto cleanup;
} }
/* /*
@ -159,13 +166,19 @@ int ecdsa_verify( const ecp_group *grp,
MPI_CHK( ecp_add( grp, &R, &R, &P ) ); MPI_CHK( ecp_add( grp, &R, &R, &P ) );
if( ecp_is_zero( &R ) ) if( ecp_is_zero( &R ) )
return( POLARSSL_ERR_ECP_BAD_INPUT_DATA ); {
ret = POLARSSL_ERR_ECP_BAD_INPUT_DATA;
goto cleanup;
}
/* /*
* Step 6: check that xR == r * Step 6: check that xR == r
*/ */
if( mpi_cmp_mpi( &R.X, r ) != 0 ) if( mpi_cmp_mpi( &R.X, r ) != 0 )
return( POLARSSL_ERR_ECP_BAD_INPUT_DATA ); {
ret = POLARSSL_ERR_ECP_BAD_INPUT_DATA;
goto cleanup;
}
cleanup: cleanup:
ecp_point_free( &R ); ecp_point_free( &P ); ecp_point_free( &R ); ecp_point_free( &P );