[PM-3565] Enforce higher minimum KDF (#6440)

Changes minimum iterations for PBKDF2 to 600 000. Also converts the constants into ranges to ensure there is only a single place for all checks.

libs/common/src/platform/misc/range-with-default.spec.ts

@@ -0,0 +1,26 @@
+import { RangeWithDefault } from "./range-with-default";
+
+describe("RangeWithDefault", () => {
+  describe("constructor", () => {
+    it("should throw an error when min is greater than max", () => {
+      expect(() => new RangeWithDefault(10, 5, 0)).toThrowError("10 is greater than 5.");
+    });
+
+    it("should throw an error when default value is not in range", () => {
+      expect(() => new RangeWithDefault(0, 10, 20)).toThrowError("Default value is not in range.");
+    });
+  });
+
+  describe("inRange", () => {
+    it("should return true when in range", () => {
+      const range = new RangeWithDefault(0, 10, 5);
+      expect(range.inRange(5)).toBe(true);
+    });
+
+    it("should return false when not in range", () => {
+      const range = new RangeWithDefault(5, 10, 7);
+      expect(range.inRange(1)).toBe(false);
+      expect(range.inRange(20)).toBe(false);
+    });
+  });
+});

libs/common/src/platform/misc/range-with-default.ts

@@ -0,0 +1,24 @@
+/**
+ * A range with a default value.
+ *
+ * Enforces constraints to ensure min > default > max.
+ */
+export class RangeWithDefault {
+  constructor(
+    readonly min: number,
+    readonly max: number,
+    readonly defaultValue: number,
+  ) {
+    if (min > max) {
+      throw new Error(`${min} is greater than ${max}.`);
+    }
+
+    if (this.inRange(defaultValue) === false) {
+      throw new Error("Default value is not in range.");
+    }
+  }
+
+  inRange(value: number): boolean {
+    return value >= this.min && value <= this.max;
+  }
+}