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Cache pre-computed points for ecp_mul()

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Up to 1.25 speedup on ECDSA sign for small curves, but mainly useful as a
preparation for fixed-point mult (a few prototypes changed in constness).
This commit is contained in:
Manuel Pégourié-Gonnard 2013-09-17 19:13:10 +02:00 • committed by Paul Bakker
parent 56cd319f0e
commit 161ef968db
6 changed files with 147 additions and 47 deletions
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4
include/polarssl/ecdh.h
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@ -62,7 +62,7 @@ ecdh_context;
* \return 0 if successful,
* or a POLARSSL_ERR_ECP_XXX or POLARSSL_MPI_XXX error code
*/
int ecdh_gen_public( const ecp_group *grp, mpi *d, ecp_point *Q,
int ecdh_gen_public( ecp_group *grp, mpi *d, ecp_point *Q,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng );
@ -83,7 +83,7 @@ int ecdh_gen_public( const ecp_group *grp, mpi *d, ecp_point *Q,
* countermeasures against potential elaborate timing
* attacks, see \c ecp_mul() for details.
*/
int ecdh_compute_shared( const ecp_group *grp, mpi *z,
int ecdh_compute_shared( ecp_group *grp, mpi *z,
const ecp_point *Q, const mpi *d,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng );