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Add ecdh_get_params() to import from an EC key

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Manuel Pégourié-Gonnard 2013-12-12 09:55:52 +01:00
parent bc64d3b221
commit cdff3cfda3
2 changed files with 47 additions and 0 deletions
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26
library/ecdh.c
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@ -165,6 +165,32 @@ int ecdh_read_params( ecdh_context *ctx,
return 0;
}
/*
* Get parameters from a keypair
*/
int ecdh_get_params( ecdh_context *ctx, const ecp_keypair *key,
ecdh_side side )
{
int ret;
if( ( ret = ecp_group_copy( &ctx->grp, &key->grp ) ) != 0 )
return( ret );
/* If it's not our key, just import the public part as Qp */
if( side == POLARSSL_ECDH_THEIRS )
return( ecp_copy( &ctx->Qp, &key->Q ) );
/* Our key: import public (as Q) and private parts */
if( side != POLARSSL_ECDH_OURS )
return( POLARSSL_ERR_ECP_BAD_INPUT_DATA );
if( ( ret = ecp_copy( &ctx->Q, &key->Q ) ) != 0 ||
( ret = mpi_copy( &ctx->d, &key->d ) ) != 0 )
return( ret );
return( 0 );
}
/*
* Setup and export the client public value
*/