How to use the saml.encrypt function in saml

if ($scope.client.attributes["saml.assertion.signature"]) {
            if ($scope.client.attributes["saml.assertion.signature"] == "true") {
                $scope.samlAssertionSignature = true;
            } else {
                $scope.samlAssertionSignature = false;
            }
        }
        if ($scope.client.attributes["saml.client.signature"]) {
            if ($scope.client.attributes["saml.client.signature"] == "true") {
                $scope.samlClientSignature = true;
            } else {
                $scope.samlClientSignature = false;
            }
        }
        if ($scope.client.attributes["saml.encrypt"]) {
            if ($scope.client.attributes["saml.encrypt"] == "true") {
                $scope.samlEncrypt = true;
            } else {
                $scope.samlEncrypt = false;
            }
        }
        if ($scope.client.attributes["saml.authnstatement"]) {
            if ($scope.client.attributes["saml.authnstatement"] == "true") {
                $scope.samlAuthnStatement = true;
            } else {
                $scope.samlAuthnStatement = false;
            }
        }
         if ($scope.client.attributes["saml.onetimeuse.condition"]) {
                    if ($scope.client.attributes["saml.onetimeuse.condition"] == "true") {
                        $scope.samlOneTimeUseCondition = true;
                    } else {

} else {
            $scope.clientEdit.attributes["saml.server.signature.keyinfo.ext"] = "false";
        }
        if ($scope.samlAssertionSignature == true) {
            $scope.clientEdit.attributes["saml.assertion.signature"] = "true";
        } else {
            $scope.clientEdit.attributes["saml.assertion.signature"] = "false";
        }
        if ($scope.samlClientSignature == true) {
            $scope.clientEdit.attributes["saml.client.signature"] = "true";
        } else {
            $scope.clientEdit.attributes["saml.client.signature"] = "false";

        }
        if ($scope.samlEncrypt == true) {
            $scope.clientEdit.attributes["saml.encrypt"] = "true";
        } else {
            $scope.clientEdit.attributes["saml.encrypt"] = "false";

        }
        if ($scope.samlAuthnStatement == true) {
            $scope.clientEdit.attributes["saml.authnstatement"] = "true";
        } else {
            $scope.clientEdit.attributes["saml.authnstatement"] = "false";

        }
        if ($scope.samlOneTimeUseCondition == true) {
                    $scope.clientEdit.attributes["saml.onetimeuse.condition"] = "true";
                } else {
                    $scope.clientEdit.attributes["saml.onetimeuse.condition"] = "false";

                }