code: func (k *KeyringSectionV1) FindMEKByKeyID(id *identity.ID) (*primitive.MEKShare, error) {
  	var mekshare *primitive.MEKShare
  	for _, m := range k.Members {
  		if *m.Body.EncryptingKeyID == *id {
  			mekshare = &primitive.MEKShare{
  				Key: m.Body.Key,
  			}
  			break
  		}
  	}
  
  	if mekshare == nil {
  		return nil, ErrMemberNotFound
  	}
  
  	return mekshare, nil
  }
docs: // FindMEKByKeyID returns the MEKShare for the given encrypting key id.
  //
  // The data is returned in the V2 format.