Python: Apply suggestions from code review

Co-authored-by: yoff <lerchedahl@gmail.com>

Author: RasmusWL

python/ql/src/semmle/python/Concepts.qll

@@ -545,7 +545,7 @@ module Cryptography {
       /** Gets the name of the cryptographic algorithm (for example `"RSA"` or `"AES"`). */
       string getName() { result = range.getName() }
 
-      /** Gets the argument that specifies size of the key in bits, if available. */
+      /** Gets the argument that specifies the size of the key in bits, if available. */
       DataFlow::Node getKeySizeArg() { result = range.getKeySizeArg() }
 
       /**
@@ -600,7 +600,7 @@ module Cryptography {
         /** Gets the name of the cryptographic algorithm (for example `"RSA"`). */
         abstract string getName();
 
-        /** Gets the argument that specifies size of the key in bits, if available. */
+        /** Gets the argument that specifies the size of the key in bits, if available. */
         abstract DataFlow::Node getKeySizeArg();
 
         /**

python/ql/src/semmle/python/frameworks/Cryptodome.qll

@@ -77,12 +77,12 @@ private module CryptodomeModel {
     }
 
     /** Gets the argument that specifies the curve to use (a string). */
-    DataFlow::Node getCurveArg() { result in [this.getArgByName("curve")] }
+    DataFlow::Node getCurveArg() { result = this.getArgByName("curve") }
 
     /** Gets the name of the curve to use, as well as the origin that explains how we obtained this name. */
     string getCurveWithOrigin(DataFlow::Node origin) {
       exists(StrConst str | origin = DataFlow::exprNode(str) |
-        origin.(DataFlow::LocalSourceNode).flowsTo(this.getCurveArg()) and
+        origin = this.getCurveArg().getALocalSource() and
         result = str.getText()
       )
     }

python/ql/src/semmle/python/frameworks/Cryptography.qll

@@ -35,7 +35,7 @@ private module CryptographyModel {
       |
         // obtained by manually looking at source code in
         // https://github.com/pyca/cryptography/blob/cba69f1922803f4f29a3fde01741890d88b8e217/src/cryptography/hazmat/primitives/asymmetric/ec.py#L208-L300
-        curveName = "SECT571R1" and keySize = 570
+        curveName = "SECT571R1" and keySize = 570 // Indeed the numbers do not match.
         or
         curveName = "SECT409R1" and keySize = 409
         or