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Change ecp_mul() prototype to allow randomization

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(Also improve an error code while at it.)
This commit is contained in:
Manuel Pégourié-Gonnard
2013-09-02 14:29:09 +02:00
parent f451bac000
commit e09d2f8261
10 changed files with 99 additions and 37 deletions
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16
library/ecdh.c
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@ -50,7 +50,9 @@ int ecdh_gen_public( const ecp_group *grp, mpi *d, ecp_point *Q,
* Compute shared secret (SEC1 3.3.1)
*/
int ecdh_compute_shared( const ecp_group *grp, mpi *z,
const ecp_point *Q, const mpi *d )
const ecp_point *Q, const mpi *d,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng )
{
int ret;
ecp_point P;
@ -62,7 +64,7 @@ int ecdh_compute_shared( const ecp_group *grp, mpi *z,
*/
MPI_CHK( ecp_check_pubkey( grp, Q ) );
MPI_CHK( ecp_mul( grp, &P, d, Q ) );
MPI_CHK( ecp_mul( grp, &P, d, Q, f_rng, p_rng ) );
if( ecp_is_zero( &P ) )
{
@ -202,16 +204,20 @@ int ecdh_read_public( ecdh_context *ctx,
* Derive and export the shared secret
*/
int ecdh_calc_secret( ecdh_context *ctx, size_t *olen,
unsigned char *buf, size_t blen )
unsigned char *buf, size_t blen,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng )
{
int ret;
if( ctx == NULL )
return( POLARSSL_ERR_ECP_BAD_INPUT_DATA );
if( ( ret = ecdh_compute_shared( &ctx->grp, &ctx->z, &ctx->Qp, &ctx->d ) )
!= 0 )
if( ( ret = ecdh_compute_shared( &ctx->grp, &ctx->z, &ctx->Qp, &ctx->d,
f_rng, p_rng ) ) != 0 )
{
return( ret );
}
if( mpi_size( &ctx->z ) > blen )
return( POLARSSL_ERR_ECP_BAD_INPUT_DATA );