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Listing 18-15. Revised SerializeWorkflowTest.cs for Rules Compilation using using using using using using using using using using System; System.IO; System.Xml; System.Collections.Generic; System.Workflow.Activities; System.Workflow.Runtime; System.Workflow.Activities.Rules; //added for rule condition reference System.Workflow.ComponentModel; System.Workflow.ComponentModel.Compiler; System.Workflow.ComponentModel.Serialization;

Asymmetric encryption algorithms use two keys: one to encrypt the data, another to decrypt it The encryption key, also called the private key, is never transmitted The decryption key, or the public key, can be freely transmitted to everyone So here is our complete solution: Mike calculates a checksum for his script, encrypts it with his private key, and sends us a message containing the script, the encrypted checksum, and his public key We can then use the public key to decrypt the checksum, calculate another checksum, and compare the two values If they are equal, then we are safe running the script..

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using Bukovics.Workflow.Hosting; using SharedWorkflows; namespace ConsoleSerializeWorkflow { /// <summary> /// Create a workflow in code and serialize it to markup /// </summary> public class SerializeWorkflowTest { ... /// <summary> /// Create a workflow by hand /// </summary> /// <returns></returns> private static Activity CreateWorkflowInCode() { ... // //Add the left side branch to the IfElseActivity // IfElseBranchActivity branch = new IfElseBranchActivity("ifElseBranchActivity1"); //add a rule condition to the branch RuleConditionReference ruleCondition = new RuleConditionReference(); ruleCondition.ConditionName = "IsNumberPositive"; branch.Condition = ruleCondition; //add a custom WriteMessageActivity to the branch WriteMessageActivity writeMessage = new WriteMessageActivity(); writeMessage.Name = "writeMessagePositive"; writeMessage.Message = "The number is positive"; branch.Activities.Add(writeMessage); //add the branch to the IfElseActivity ifElse.Activities.Add(branch); ... }

The scheme to certify script integrity looks perfect until we realize that a malicious person can again intercept the message, modify the script, update the checksum, encrypt it with her private key, and then replace the included public key with her public key. To protect ourselves from that type of attack, we need a way to tell that the public key we got is Mike s key and not somebody else s. We cannot do this all by ourselves. We need a third-party entity that we trust to keep record of everybody s public keys and confirm for us that a key really belongs to the person or organization we believe it to. Today, this task is performed by institutions known as certification authorities (CAs). The most popular ones are companies like VeriSign and Thawte. Certification authorities issue all public/private key pairs and can tell if a public key really belongs to a given person or organization. When we purchase a digital identity from a CA, essentially, we get a public/private key pair. We receive our keys in a private key file and a certificate

Replace the CodeCondition with the highlighted code that creates a rule condition. private static void CompileWorkflow( String fileName, String assemblyName) { WorkflowCompiler compiler = new WorkflowCompiler(); WorkflowCompilerParameters parameters = new WorkflowCompilerParameters(); parameters.OutputAssembly = assemblyName; parameters.ReferencedAssemblies.Add("SharedWorkflows.dll"); //add the .rules file for this workflow as a resource parameters.EmbeddedResources.Add("ProWF.MyNewWorkflowClass.rules"); Add this line to identify the .rules file as an embedded resource in the compiled assembly. WorkflowCompilerResults results = compiler.Compile(parameters, fileName); if (results.Errors.Count > 0) { foreach (System.CodeDom.Compiler.CompilerError error in results.Errors) { Console.WriteLine("Compiler error: Line{0}: {1}", error.Line, error.ErrorText); } } } } } After building the solution, you can execute the ConsoleSerializeWorkflow and should see the same results. If you disassemble the new assembly that was created (MyNewAssembly.dll) using the ildasm.exe utility (included with Visual Studio and the Windows SDK), you will see in the assembly manifest that the .rules file is included as an embedded resource like this: .mresource public ProWF.MyNewWorkflowClass.rules { // Offset: 0x00000000 Length: 0x00000C5D }

Figure 4-5. Persistence in WF 4.0 Some of the real power of the workflow infrastructure in WF 4.0 only becomes apparent when you plug in persistence services, or so-called Persistence Providers. One such provider is the SQL Server Persistence provider, which is available out-of-box with the .NET 4.0 Framework.

The previous two examples that compiled the workflow markup into an assembly used the WorkflowCompiler class provided with WF. Also provided with WF is a command-line workflow compiler (wfc.exe) that offers the same capabilities as the WorkflowCompiler class.

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