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Add ecdh_get_params() to import from an EC key
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@ -33,6 +33,15 @@
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extern "C" {
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#endif
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/**
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* When importing from an EC key, select if it is our key or the peer's key
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*/
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typedef enum
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{
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POLARSSL_ECDH_OURS,
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POLARSSL_ECDH_THEIRS,
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} ecdh_side;
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/**
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* \brief ECDH context structure
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*/
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@ -134,6 +143,18 @@ int ecdh_make_params( ecdh_context *ctx, size_t *olen,
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int ecdh_read_params( ecdh_context *ctx,
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const unsigned char **buf, const unsigned char *end );
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/**
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* \brief Setup an ECDH context from an EC key
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*
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* \param ctx ECDH constext to set
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* \param key EC key to use
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* \param ours Is it our key (1) or the peer's key (0) ?
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*
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* \return 0 if successful, or an POLARSSL_ERR_ECP_XXX error code
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*/
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int ecdh_get_params( ecdh_context *ctx, const ecp_keypair *key,
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ecdh_side side );
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/**
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* \brief Setup and export the client's public value
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*
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@ -165,6 +165,32 @@ int ecdh_read_params( ecdh_context *ctx,
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return 0;
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}
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/*
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* Get parameters from a keypair
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*/
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int ecdh_get_params( ecdh_context *ctx, const ecp_keypair *key,
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ecdh_side side )
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{
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int ret;
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if( ( ret = ecp_group_copy( &ctx->grp, &key->grp ) ) != 0 )
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return( ret );
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/* If it's not our key, just import the public part as Qp */
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if( side == POLARSSL_ECDH_THEIRS )
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return( ecp_copy( &ctx->Qp, &key->Q ) );
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/* Our key: import public (as Q) and private parts */
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if( side != POLARSSL_ECDH_OURS )
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return( POLARSSL_ERR_ECP_BAD_INPUT_DATA );
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if( ( ret = ecp_copy( &ctx->Q, &key->Q ) ) != 0 ||
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( ret = mpi_copy( &ctx->d, &key->d ) ) != 0 )
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return( ret );
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return( 0 );
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}
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/*
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* Setup and export the client public value
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*/
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