Crypto: Updating weak asymmetric key gen to include key exchange.

java/ql/src/experimental/quantum/Examples/WeakAsymmetricKeyGenSize.ql

@@ -17,6 +17,7 @@ where
   key.getCreatingOperation().getAKeySizeSource().asElement().(Literal).getValue().toInt() = keySize and
   alg = key.getAKnownAlgorithm() and // NOTE: if algorithm is not known (doesn't bind) we need a separate query
   not alg instanceof Crypto::EllipticCurveNode and // Elliptic curve sizes are handled separately and are more tied directly to the algorithm
+  alg instanceof Crypto::AsymmetricAlgorithmNode and
   keySize < 2048
 select key, "Use of weak asymmetric key size (" + keySize.toString() + " bits) for algorithm $@",
   alg, alg.getAlgorithmName()

shared/quantum/codeql/quantum/experimental/Model.qll

@@ -1467,7 +1467,8 @@ module CryptographyBase<LocationSig Location, InputSig<Location> Input> {
   class AsymmetricAlgorithmNode extends TKeyCreationCandidateAlgorithm instanceof AlgorithmNode {
     AsymmetricAlgorithmNode() {
       this instanceof EllipticCurveNode or
-      this.(KeyOperationAlgorithmNode).isAsymmetric()
+      this.(KeyOperationAlgorithmNode).isAsymmetric() or
+      this instanceof KeyAgreementAlgorithmNode
     }
 
     string toString() { result = super.toString() }