PDFDecryptor Component

Properties   Methods   Events   Config Settings   Errors  

The PDFDecryptor component decrypts PDF documents.

Syntax

TsbxPDFDecryptor

Remarks

PDFDecryptor decrypts PDF documents encrypted with passwords or certificates.

Property List

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The following is the full list of the properties of the component with short descriptions. Click on the links for further details.

Method List

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The following is the full list of the methods of the component with short descriptions. Click on the links for further details.

Event List

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The following is the full list of the events fired by the component with short descriptions. Click on the links for further details.

Config Settings

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The following is a list of config settings for the component with short descriptions. Click on the links for further details.

DecryptionCertificate Property (PDFDecryptor Component)

A decryption certificate.

Syntax

property DecryptionCertificate: TsbxCertificate read get_DecryptionCertificate write set_DecryptionCertificate;

Remarks

Use this property to provide the decryption certificate. The certificate should have a private key associated with it.

This property is not available at design time.

Please refer to the Certificate type for a complete list of fields.

DocumentInfo Property (PDFDecryptor Component)

Contains information about the document properties.

Syntax

property DocumentInfo: TsbxPDFDocumentInfo read get_DocumentInfo;

Remarks

Use this property to access general parameters of the document being processed. A good place to check this property is in the handler of the DocumentLoaded event.

This property is read-only and not available at design time.

Please refer to the PDFDocumentInfo type for a complete list of fields.

ExternalCrypto Property (PDFDecryptor Component)

Provides access to external signing and DC parameters.

Syntax

property ExternalCrypto: TsbxExternalCrypto read get_ExternalCrypto;

Remarks

Use this property to tune-up remote cryptography settings. SecureBlackbox supports two independent types of external cryptography: synchronous (based on the ExternalSign event) and asynchronous (based on the DC protocol and the DCAuth signing component).

This property is read-only.

Please refer to the ExternalCrypto type for a complete list of fields.

FIPSMode Property (PDFDecryptor Component)

Reserved.

Syntax

property FIPSMode: Boolean read get_FIPSMode write set_FIPSMode;

Default Value

false

Remarks

This property is reserved for future use.

InputBytes Property (PDFDecryptor Component)

Use this property to pass the input to component in byte array form.

Syntax

property InputBytes: TBytes read get_InputBytes write set_InputBytes;

Remarks

Assign a byte array containing the data to be processed to this property.

This property is not available at design time.

InputFile Property (PDFDecryptor Component)

The PDF file to be decrypted.

Syntax

property InputFile: String read get_InputFile write set_InputFile;

Default Value

''

Remarks

Provide the path to the PDF document to be decrypted.

OutputBytes Property (PDFDecryptor Component)

Use this property to read the output the component object has produced.

Syntax

property OutputBytes: TBytes read get_OutputBytes;

Remarks

Read the contents of this property after the operation has completed to read the produced output. This property will only be set if the OutputFile and OutputStream properties had not been assigned.

This property is read-only and not available at design time.

OutputFile Property (PDFDecryptor Component)

The file to save the decrypted document to.

Syntax

property OutputFile: String read get_OutputFile write set_OutputFile;

Default Value

''

Remarks

Specifies the path where the decrypted PDF should be saved.

Password Property (PDFDecryptor Component)

The decryption password.

Syntax

property Password: String read get_Password write set_Password;

Default Value

''

Remarks

Use this property to provide the decryption password.

Config Method (PDFDecryptor Component)

Sets or retrieves a configuration setting.

Syntax

function Config(ConfigurationString: String): String;

Remarks

Config is a generic method available in every component. It is used to set and retrieve configuration settings for the component.

These settings are similar in functionality to properties, but they are rarely used. In order to avoid "polluting" the property namespace of the component, access to these internal properties is provided through the Config method.

To set a configuration setting named PROPERTY, you must call Config("PROPERTY=VALUE"), where VALUE is the value of the setting expressed as a string. For boolean values, use the strings "True", "False", "0", "1", "Yes", or "No" (case does not matter).

To read (query) the value of a configuration setting, you must call Config("PROPERTY"). The value will be returned as a string.

Decrypt Method (PDFDecryptor Component)

Decrypts a PDF document.

Syntax

procedure Decrypt();

Remarks

Use this method to decrypt a PDF document provided via InputFile (InputStream). The decrypted document will be saved in OutputFile (OutputStream).

DoAction Method (PDFDecryptor Component)

Performs an additional action.

Syntax

function DoAction(ActionID: String; ActionParams: String): String;

Remarks

DoAction is a generic method available in every component. It is used to perform an additional action introduced after the product major release. The list of actions is not fixed, and may be flexibly extended over time.

The unique identifier (case insensitive) of the action is provided in the ActionID parameter.

ActionParams contains the value of a single parameter, or a list of multiple parameters for the action in the form of PARAM1=VALUE1;PARAM2=VALUE2;....

DocumentLoaded Event (PDFDecryptor Component)

This event is fired when the document has been loaded into memory.

Syntax

type TDocumentLoadedEvent = procedure (
  Sender: TObject;
  var Cancel: Boolean
) of Object;

property OnDocumentLoaded: TDocumentLoadedEvent read FOnDocumentLoaded write FOnDocumentLoaded;

Remarks

The handler for this event is a good place to check the document structure, which may be useful when preparing the signature. For example, you can use the Pages information to find the optimal position for the signature widget.

Set Cancel to true to terminate document processing on this stage.

Encrypted Event (PDFDecryptor Component)

Notifies the application that the document is encrypted and provides recipient certificate details if asymmetric encryption was used to encrypt the document.

Syntax

type TEncryptedEvent = procedure (
  Sender: TObject;
  CertUsed: Boolean;
  const IssuerRDN: String;
  SerialNumber: TBytes;
  SubjectKeyID: TBytes;
  NeedCredential: Boolean;
  var SkipThis: Boolean
) of Object;

property OnEncrypted: TEncryptedEvent read FOnEncrypted write FOnEncrypted;

Remarks

The component fires this event when processing encrypted documents to report the fact of encryption and pass certificate parameters to the user.

This event fires repeatedly for each encryption mechanism used in the document until the user provides the correct credential via the DecryptionCertificate or Password property (depending on the encryption method used), or sets SkipThis to true.

The CertUsed parameter specifies the encryption method used. If set to true, it indicates that the document uses asymmetric (certificate-based) encryption. In that case, the IssuerRDN, SerialNumber, and SubjectKeyID parameters provide the details of the encryption certificate. Note that the document can be encrypted with more than one certificate (or have "more than one recipient"), in which case each certificate will invoke its own Encrypted event loop.

CertUsed set to false indicates that the document uses password encryption. In this case, provide the password via the Password property.

The NeedCredential parameter specifies whether the correct credential is already available to the component or still needs to be set. One example where NeedCredential would be set to false is where it had been provided by the application prior to processing the document (e.g. by setting the Password property to a known pre-defined value). If NeedCredential is set to true, you must provide the valid credential for the decryption process to succeed.

Error Event (PDFDecryptor Component)

Information about errors during signing/validation.

Syntax

type TErrorEvent = procedure (
  Sender: TObject;
  ErrorCode: Integer;
  const Description: String
) of Object;

property OnError: TErrorEvent read FOnError write FOnError;

Remarks

The event is fired in case of exceptional conditions during PDF processing.

ErrorCode contains an error code and Description contains a textual description of the error.

ExternalDecrypt Event (PDFDecryptor Component)

Handles remote or external decryption.

Syntax

type TExternalDecryptEvent = procedure (
  Sender: TObject;
  const OperationId: String;
  const Algorithm: String;
  const Pars: String;
  const EncryptedData: String;
  var Data: String
) of Object;

property OnExternalDecrypt: TExternalDecryptEvent read FOnExternalDecrypt write FOnExternalDecrypt;

Remarks

Assign a handler to this event if you need to delegate a low-level decryption operation to an external, remote, or custom decryption engine. The handler receives an encrypted value in the EncryptedData parameter, and is expected to decrypt it and place the decrypted value into the Data parameter.

OperationId provides a comment about the operation and its origin. It depends on the exact component being used, and may be empty. Algorithm specifies the encryption algorithm being used, and Pars contains algorithm-dependent parameters.

The component uses base16 (hex) encoding for the EncryptedData, Data, and Pars parameters. If your decryption engine uses a different input and output encoding, you may need to decode and/or encode the data before and/or after the decryption.

Sample data encoded in base16: a0dee2a0382afbb09120ffa7ccd8a152 - lower case base16 A0DEE2A0382AFBB09120FFA7CCD8A152 - upper case base16

Notification Event (PDFDecryptor Component)

This event notifies the application about an underlying control flow event.

Syntax

type TNotificationEvent = procedure (
  Sender: TObject;
  const EventID: String;
  const EventParam: String
) of Object;

property OnNotification: TNotificationEvent read FOnNotification write FOnNotification;

Remarks

The component fires this event to let the application know about some event, occurrence, or milestone in the component. For example, it may fire to report completion of the document processing. The list of events being reported is not fixed, and may be flexibly extended over time.

The unique identifier of the event is provided in the EventID parameter. EventParam contains any parameters accompanying the occurrence. Depending on the type of the component, the exact action it is performing, or the document being processed, one or both may be omitted.

Certificate Type

Provides details of an individual X.509 certificate.

Remarks

This type provides access to X.509 certificate details.

Fields

Constructors

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constructor Create();

Creates a new object with default field values.

ExternalCrypto Type

Specifies the parameters of external cryptographic calls.

Remarks

External cryptocalls are used in a Distributed Cryptography (DC) subsystem, which allows the delegation of security operations to the remote agent. For instance, it can be used to compute the signature value on the server, while retaining the client's private key locally.

Fields

Constructors

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constructor Create();

Creates a new ExternalCrypto object with default field values.

PDFDocumentInfo Type

Contains document security information.

Remarks

This type provides an overview of the document security parameters, including the encryption method (if used) and signature count. This information is available early into the signing/validation process and lets you prepare for the subsequent signature validation.

Fields

Constructors

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constructor Create();

Initializes an instance of PDFDocumentInfo class.

Config Settings (PDFDecryptor Component)

The component accepts one or more of the following configuration settings. Configuration settings are similar in functionality to properties, but they are rarely used. In order to avoid "polluting" the property namespace of the component, access to these internal properties is provided through the Config method.

PDFDecryptor Config Settings

Base Config Settings

Trappable Errors (PDFDecryptor Component)

PDFDecryptor Errors

	1048577   Invalid parameter value (SB_ERROR_INVALID_PARAMETER)
	1048578   Component is configured incorrectly (SB_ERROR_INVALID_SETUP)
	1048579   Operation cannot be executed in the current state (SB_ERROR_INVALID_STATE)
	1048580   Attempt to set an invalid value to a property (SB_ERROR_INVALID_VALUE)
	1048581   Certificate does not have its private key loaded (SB_ERROR_NO_PRIVATE_KEY)
	1048581   Cancelled by the user (SB_ERROR_CANCELLED_BY_USER) 
	26214401   Input file does not exist (SB_ERROR_PDF_INPUTFILE_NOT_EXISTS)
	26214402   Document is encrypted (SB_ERROR_PDF_ENCRYPTED)
	26214403   Document not encrypted (SB_ERROR_PDF_NOT_ENCRYPTED)
	26214404   Unknown certificate type (SB_ERROR_PDF_UNKNOWN_ENCRYPTION_TYPE)
	26214405   Invalid password (SB_ERROR_PDF_INVALID_PASSWORD)
	26214406   Decryption failed (SB_ERROR_PDF_DECRYPTION_FAILED)
	26214407   Document is signed (SB_ERROR_PDF_SIGNED)
	26214408   Document is not signed (SB_ERROR_PDF_NOT_SIGNED)
	26214409   Inappropriate signature (SB_ERROR_PDF_INAPPROPRIATE_SIGNATURE)
	26214410   Not supported (SB_ERROR_PDF_NOT_SUPPORTED)