Determining Encryption Type

You can programmatically determine the type of encryption that is protecting a PDF document by using the Java Encryption Service API or the web service Encryption Service API. Sometimes it is necessary to dynamically determine whether a PDF document is encrypted and, if so, the encryption type. For example, you can determine whether a PDF document is protected with password-based encryption or a Rights Management policy.

A PDF document can be protected by the following encryption types:

  • Password-based encryption

  • Certificate-based encryption

  • A policy that is created by the Rights Management service

  • Another type of encryption

注意: For more information about the Encryption service, see Services Reference for LiveCycle.

Summary of steps

To determine the type of encryption that is protecting a PDF document, perform the following steps:

  1. Include project files.

  2. Create an encryption service client.

  3. Get the encrypted PDF document.

  4. Determine the encryption type.

Include project files

Include necessary files into your development project. If you are creating a client application using Java, include the necessary JAR files. If you are using web services, ensure that you include the proxy files.

The following JAR files must be added to your project’s class path:

  • adobe-livecycle-client.jar

  • adobe-usermanager-client.jar

  • adobe-encryption-client.jar

  • adobe-utilities.jar (required if LiveCycle is deployed on JBoss Application Server)

  • jbossall-client.jar (required if LiveCycle is deployed on JBoss Application Server)

Create a service client

To programmatically perform an Encryption service operation, you must create an Encryption service client. If you are using the Java Encryption Service API, create an EncrytionServiceClient object. If you are using the web service Encryption Service API, create an EncryptionServiceService object.

Get the encrypted PDF document

You must obtain a PDF document to determine the type of encryption that is protecting it.

Determine the encryption type

You can determine the type of encryption that is protecting a PDF document. If the PDF document is not protected, then the Encryption service informs you that the PDF document is not secured.

Determine the encryption type using the Java API

Determine the type of encryption that is protecting a PDF document by using the Encryption API (Java):

  1. Include project files.

    Include client JAR files, such as adobe-encryption-client.jar, in your Java project’s class path.

  2. Create a service client.

    • Create a ServiceClientFactory object that contains connection properties.

    • Create an EncryptionServiceClient object by using its constructor and passing the ServiceClientFactory object.

  3. Get the encrypted PDF document.

    • Create a java.io.FileInputStream object that represents the PDF document by using its constructor and passing a string value that specifies the location of the PDF document.

    • Create a com.adobe.idp.Document object by using its constructor and passing the java.io.FileInputStream object.

  4. Determine the encryption type.

    • Determine the encryption type by invoking the EncryptionServiceClient object’s getPDFEncryption method and passing thecom.adobe.idp.Document object that contains the PDF document. This method returns an EncryptionTypeResult object.

    • Invoke the EncryptionTypeResult object’s getEncryptionType method. This method returns an EncryptionType enum value that specifies the encryption type. For example, if the PDF document is protected with password-based encryption, this method returns EncryptionType.PASSWORD.

Determine the encryption type using the web service API

Determine the type of encryption that is protecting a PDF document by using the Encryption API (web service):

  1. Include project files.

    Create a Microsoft .NET project that uses MTOM. Ensure that you use the following WSDL definition: http://localhost:8080/soap/services/EncryptionService?WSDL&lc_version=9.0.1.

    注意: Replace localhost with the IP address of the server hosting LiveCycle.
  2. Create a service client.

    • Create an EncryptionServiceClient object by using its default constructor.

    • Create an EncryptionServiceClient.Endpoint.Address object by using the System.ServiceModel.EndpointAddress constructor. Pass a string value that specifies the WSDL to the LiveCycle service (for example, http://localhost:8080/soap/services/EncryptionService?WSDL.) You do not need to use the lc_version attribute. This attribute is used when you create a service reference.)

    • Create a System.ServiceModel.BasicHttpBinding object by getting the value of the EncryptionServiceClient.Endpoint.Binding field. Cast the return value to BasicHttpBinding.

    • Set the System.ServiceModel.BasicHttpBinding object’s MessageEncoding field to WSMessageEncoding.Mtom. This value ensures that MTOM is used.

    • Enable basic HTTP authentication by performing the following tasks:

      • Assign the LiveCycle user name to the field EncryptionServiceClient.ClientCredentials.UserName.UserName.

      • Assign the corresponding password value to the field EncryptionServiceClient.ClientCredentials.UserName.Password.

      • Assign the constant value HttpClientCredentialType.Basic to the field BasicHttpBindingSecurity.Transport.ClientCredentialType.

      • Assign the constant value BasicHttpSecurityMode.TransportCredentialOnly to the field BasicHttpBindingSecurity.Security.Mode.

  3. Get the encrypted PDF document.

    • Create a BLOB object by using its constructor.

    • Create a System.IO.FileStream object by invoking its constructor and passing a string value that represents the file location of the encrypted PDF document and the mode in which to open the file.

    • Create a byte array that stores the content of the System.IO.FileStream object. You can determine the size of the byte array by getting the System.IO.FileStream object’s Length property.

    • Populate the byte array with stream data by invoking the System.IO.FileStream object’s Read method and passing the byte array, the starting position, and the stream length to read.

    • Populate the BLOB object by assigning the contents of the byte array to the BLOB object’s MTOM data member.

  4. Determine the encryption type.

    • Invoke the EncryptionServiceClient object’s getPDFEncryption method and pass the BLOB object that contains the PDF document. This method returns an EncryptionTypeResult object.

    • Get the value of the EncryptionTypeResult object’s encryptionType data method. For example, if the PDF document is protected with password-based encryption, the value of this data member is EncryptionType.PASSWORD.