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Introduce muladd_restartable() and its sub-context

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Only the administrative parts for now, not actually restartable so far.
This commit is contained in:
Manuel Pégourié-Gonnard 2017-04-20 13:36:18 +02:00
parent a08cd1a77f
commit 54dd6527f0
4 changed files with 199 additions and 13 deletions
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35
include/mbedtls/ecp.h
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@ -179,6 +179,13 @@ mbedtls_ecp_keypair;
*/
typedef struct mbedtls_ecp_restart_mul mbedtls_ecp_restart_mul_ctx;
/**
* \brief Internal restart context for ecp_muladd()
*
* \note Opaque struct
*/
typedef struct mbedtls_ecp_restart_muladd mbedtls_ecp_restart_muladd_ctx;
/**
* \brief General context for resuming ECC operations
*/
@ -187,6 +194,7 @@ typedef struct
unsigned ops_done; /*!< current ops count */
unsigned depth; /*!< call depth (0 = top-level) */
mbedtls_ecp_restart_mul_ctx *rsm; /*!< ecp_mul_comb() sub-context */
mbedtls_ecp_restart_muladd_ctx *ma; /*!< ecp_muladd() sub-context */
} mbedtls_ecp_restart_ctx;
#endif /* MBEDTLS_ECP_EARLY_RETURN */
@ -654,6 +662,33 @@ int mbedtls_ecp_muladd( mbedtls_ecp_group *grp, mbedtls_ecp_point *R,
const mbedtls_mpi *m, const mbedtls_ecp_point *P,
const mbedtls_mpi *n, const mbedtls_ecp_point *Q );
#if defined(MBEDTLS_ECP_EARLY_RETURN)
/**
* \brief Restartable version of \c mbedtls_ecp_muladd()
*
* \note Performs the same job as \c mbedtls_ecp_muladd(), but can
* return early and restart according to the limit set with
* \c mbedtls_ecp_set_max_ops() to reduce blocking.
*
* \param grp ECP group
* \param R Destination point
* \param m Integer by which to multiply P
* \param P Point to multiply by m
* \param n Integer by which to multiply Q
* \param Q Point to be multiplied by n
* \param rs_ctx Restart context
*
* \return See \c mbedtls_ecp_muladd(), or
* MBEDTLS_ERR_ECP_IN_PROGRESS if maximum number of
* operations was reached: see \c mbedtls_ecp_set_max_ops().
*/
int mbedtls_ecp_muladd_restartable(
mbedtls_ecp_group *grp, mbedtls_ecp_point *R,
const mbedtls_mpi *m, const mbedtls_ecp_point *P,
const mbedtls_mpi *n, const mbedtls_ecp_point *Q,
mbedtls_ecp_restart_ctx *rs_ctx );
#endif
/**
* \brief Check that a point is a valid public key on this curve
*