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Add ECDH primitives

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Manuel Pégourié-Gonnard 2013-01-26 16:05:22 +01:00
parent 0bad5c2381
commit 6545ca7bed
4 changed files with 91 additions and 3 deletions
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39
library/ecdh.c
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@ -35,6 +35,45 @@
#include "polarssl/ecdh.h"
/*
* Generate public key: simple wrapper around ecp_gen_keypair
*/
int ecdh_gen_public( const ecp_group *grp, mpi *d, ecp_point *Q,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng )
{
return ecp_gen_keypair( grp, d, Q, f_rng, p_rng );
}
/*
* Compute shared secret (SEC1 3.3.1)
*/
int ecdh_compute_shared( const ecp_group *grp, mpi *z,
const ecp_point *Q, const mpi *d )
{
int ret;
ecp_point P;
ecp_point_init( &P );
/*
* Make sure Q is a valid pubkey before using it
*/
MPI_CHK( ecp_check_pubkey( grp, Q ) );
MPI_CHK( ecp_mul( grp, &P, d, Q ) );
if( ecp_is_zero( &P ) )
return( POLARSSL_ERR_ECP_BAD_INPUT_DATA );
MPI_CHK( mpi_copy( z, &P.X ) );
cleanup:
ecp_point_free( &P );
return( ret );
}
#if defined(POLARSSL_SELF_TEST)