How to use the saml.assertion.signature function in saml

}

        if ($scope.samlServerSignature == true) {
            $scope.clientEdit.attributes["saml.server.signature"] = "true";
        } else {
            $scope.clientEdit.attributes["saml.server.signature"] = "false";
        }
        if ($scope.samlServerSignatureEnableKeyInfoExtension == true) {
            $scope.clientEdit.attributes["saml.server.signature.keyinfo.ext"] = "true";
        } 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 {

if ($scope.client.attributes["saml.server.signature.keyinfo.ext"]) {
            if ($scope.client.attributes["saml.server.signature.keyinfo.ext"] == "true") {
                $scope.samlServerSignatureEnableKeyInfoExtension = true;
            } else {
                $scope.samlServerSignatureEnableKeyInfoExtension = false;
            }
        }
        if ($scope.client.attributes['saml.server.signature.keyinfo.xmlSigKeyInfoKeyNameTransformer'] === 'NONE') {
            $scope.samlXmlKeyNameTranformer = $scope.xmlKeyNameTranformers[0];
        } else if ($scope.client.attributes['saml.server.signature.keyinfo.xmlSigKeyInfoKeyNameTransformer'] === 'KEY_ID') {
            $scope.samlXmlKeyNameTranformer = $scope.xmlKeyNameTranformers[1];
        } else if ($scope.client.attributes['saml.server.signature.keyinfo.xmlSigKeyInfoKeyNameTransformer'] === 'CERT_SUBJECT') {
            $scope.samlXmlKeyNameTranformer = $scope.xmlKeyNameTranformers[2];
        }
        if ($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 {