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Add mbedtls_ecdh_can_do

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All curves can currently do ECDH, but to make the API symmetric and
future-proof, add mbedtls_ecdh_can_do() to go with mbedtls_ecdsa_can_do().
This commit is contained in:
Gilles Peskine 2019-02-11 18:41:27 +01:00 committed by Janos Follath
parent 1fdf2c2d1c
commit 20b3ef3cad
3 changed files with 25 additions and 0 deletions
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9
include/mbedtls/ecdh.h
View File

@ -144,6 +144,15 @@ typedef struct mbedtls_ecdh_context
} }
mbedtls_ecdh_context; mbedtls_ecdh_context;
/**
* \brief Check whether a given group can be used for ECDH.
*
* \param gid The ECP group ID to check.
*
* \return \c 1 if the group can be used, \c 0 otherwise
*/
int mbedtls_ecdh_can_do( mbedtls_ecp_group_id gid );
/** /**
* \brief This function generates an ECDH keypair on an elliptic * \brief This function generates an ECDH keypair on an elliptic
* curve. * curve.

7
library/ecdh.c
View File

@ -63,6 +63,13 @@ static mbedtls_ecp_group_id mbedtls_ecdh_grp_id(
#endif #endif
} }
int mbedtls_ecdh_can_do( mbedtls_ecp_group_id gid )
{
/* At this time, all groups support ECDH. */
(void) gid;
return 1;
}
#if !defined(MBEDTLS_ECDH_GEN_PUBLIC_ALT) #if !defined(MBEDTLS_ECDH_GEN_PUBLIC_ALT)
/* /*
* Generate public key (restartable version) * Generate public key (restartable version)

9
programs/test/benchmark.c
View File

@ -911,6 +911,9 @@ int main( int argc, char *argv[] )
curve_info->grp_id != MBEDTLS_ECP_DP_NONE; curve_info->grp_id != MBEDTLS_ECP_DP_NONE;
curve_info++ ) curve_info++ )
{ {
if( ! mbedtls_ecdh_can_do( curve_info->grp_id ) )
continue;
mbedtls_ecdh_init( &ecdh ); mbedtls_ecdh_init( &ecdh );
CHECK_AND_CONTINUE( mbedtls_ecp_group_load( &ecdh.grp, curve_info->grp_id ) ); CHECK_AND_CONTINUE( mbedtls_ecp_group_load( &ecdh.grp, curve_info->grp_id ) );
@ -956,6 +959,9 @@ int main( int argc, char *argv[] )
curve_info->grp_id != MBEDTLS_ECP_DP_NONE; curve_info->grp_id != MBEDTLS_ECP_DP_NONE;
curve_info++ ) curve_info++ )
{ {
if( ! mbedtls_ecdh_can_do( curve_info->grp_id ) )
continue;
mbedtls_ecdh_init( &ecdh ); mbedtls_ecdh_init( &ecdh );
CHECK_AND_CONTINUE( mbedtls_ecp_group_load( &ecdh.grp, curve_info->grp_id ) ); CHECK_AND_CONTINUE( mbedtls_ecp_group_load( &ecdh.grp, curve_info->grp_id ) );
@ -1012,6 +1018,9 @@ int main( int argc, char *argv[] )
curve_info->grp_id != MBEDTLS_ECP_DP_NONE; curve_info->grp_id != MBEDTLS_ECP_DP_NONE;
curve_info++ ) curve_info++ )
{ {
if( ! mbedtls_ecdh_can_do( curve_info->grp_id ) )
continue;
mbedtls_ecdh_init( &ecdh_srv ); mbedtls_ecdh_init( &ecdh_srv );
mbedtls_ecdh_init( &ecdh_cli ); mbedtls_ecdh_init( &ecdh_cli );
CHECK_AND_CONTINUE( mbedtls_ecdh_setup( &ecdh_srv, curve_info->grp_id ) ); CHECK_AND_CONTINUE( mbedtls_ecdh_setup( &ecdh_srv, curve_info->grp_id ) );