Swift: Add test for sqlite3 C API.

Author: geoffw0

swift/ql/test/query-tests/Security/CWE-321/sqlite3_c_api.swift

@@ -0,0 +1,44 @@
+
+// --- stubs ---
+
+struct Data {
+    init<S>(_ elements: S) { count = 0 }
+
+	func withUnsafeBytes<ResultType, ContentType>(_ body: (UnsafePointer<ContentType>) throws -> ResultType) rethrows -> ResultType {
+		return 0 as! ResultType//body(0 as UnsafePointer<ContentType>())
+	}
+
+	var count: Int
+}
+
+var SQLITE_OK : Int32 = 0
+
+func sqlite3_key_v2(
+		_ db: OpaquePointer?,
+		_ zDbName: UnsafePointer<CChar>?,
+		_ pKey: UnsafeRawPointer?,
+		_ nKey: Int32
+	) -> Int32 { return SQLITE_OK }
+
+func sqlite3_rekey_v2(
+		_ db: OpaquePointer?,
+		_ zDbName: UnsafePointer<CChar>?,
+		_ pKey: UnsafeRawPointer?,
+		_ nKey: Int32
+	) -> Int32 { return SQLITE_OK }
+
+// --- tests ---
+
+func test_sqlite3_c_api(db: OpaquePointer?, myVarKey: Data) {
+	let myConstKey = Data("abcdef123456")
+
+	// SQLite (C API) Encryption Extension
+	myVarKey.withUnsafeBytes { buffer in
+		_ = sqlite3_key_v2(db, "dbname", buffer, Int32(myVarKey.count))
+		_ = sqlite3_rekey_v2(db, "dbname", buffer, Int32(myVarKey.count))
+	}
+	myConstKey.withUnsafeBytes { buffer in
+		_ = sqlite3_key_v2(db, "dbname", buffer, Int32(myVarKey.count)) // BAD [NOT DETECTED]
+		_ = sqlite3_rekey_v2(db, "dbname", buffer, Int32(myVarKey.count)) // BAD [NOT DETECTED]
+	}
+}