Refactor output artifact type

java/ql/lib/experimental/Quantum/JCA.qll

@@ -419,7 +419,7 @@ module JCAModel {
       src.asExpr() instanceof CipherGetInstanceCall
     }
 
-    predicate isSink(DataFlow::Node sink, FlowState state) { none() }
+    predicate isSink(DataFlow::Node sink, FlowState state) { none() } // TODO: document this, but this is intentional (avoid cross products?)
 
     predicate isSink(DataFlow::Node sink) {
       exists(CipherOperationCall c | c.getQualifier() = sink.asExpr())
@@ -786,7 +786,7 @@ module JCAModel {
       type instanceof Crypto::TAsymmetricKeyType
     }
 
-    override DataFlow::Node getOutputKeyArtifact() { result.asExpr() = this }
+    override Crypto::ArtifactOutputDataFlowNode getOutputKeyArtifact() { result.asExpr() = this }
 
     override Crypto::KeyArtifactType getOutputKeyType() { result = type }
 
@@ -1139,7 +1139,7 @@ module JCAModel {
       result.asExpr() = this.getInstantiation().getIterationCountArg()
     }
 
-    override DataFlow::Node getOutputKeyArtifact() {
+    override Crypto::ArtifactOutputDataFlowNode getOutputKeyArtifact() {
       result.asExpr() = this and
       super.getMethod().getReturnType().hasName("SecretKey")
     }

java/ql/lib/experimental/Quantum/Language.qll

@@ -191,19 +191,5 @@ module ArtifactUniversalFlowConfig implements DataFlow::ConfigSig {
 
 module GenericDataSourceUniversalFlow = TaintTracking::Global<GenericDataSourceUniversalFlowConfig>;
 
-/*
- * class LiteralOrGenericDataSource extends Element {
- *  DataFlow::Node node;
- *
- *  LiteralOrGenericDataSource() {
- *    node = this.(Crypto::GenericSourceInstance).getOutputNode() or
- *    node.asExpr() = this.(Literal)
- *  }
- *
- *  bindingset[other]
- *  predicate localFlowsTo(DataFlow::Node other) { DataFlow::localFlow(node, other) }
- * }
- */
-
 // Import library-specific modeling
 import JCA