PDFVerify Component

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The PDFVerify component verifies PDF signatures.

Syntax

nsoftware.SecurePDF.PDFVerify

Remarks

The PDFVerify component verifies electronic signatures over PDF documents. Basic Adobe and PAdES signatures are supported.

PDFVerify validates each signature from two perspectives: the integrity and validity of the signature itself (i.e., its correspondence to the document data it covers), and the validity and trustworthiness of the signing certificate chain. These two signature aspects are generally independent of each other - the signature may be valid but the chain may not be trusted, or the chain may be trusted but the integrity of the signature may be violated. Under normal circumstances, both the signature and the chain must be valid for the signature to be considered good.

Preparing the Validation

For every signature in the document, PDFVerify will fire the SignatureInfo event, allowing you to specify whether you want the component to validate the signature, the chain, or both.

Once SignatureInfo returns, PDFVerify proceeds to the signature validation routine in accordance with the provided settings.

Validation Results

Upon completion of the validation, the SignatureProcessed event is fired, and the validation results are published here as well as in the following fields of the associated PDFSignature object:

• SignatureValidationResult contains the outcome of the signature validation: valid, corrupted, the signing certificate was missing, or failed.
• ChainValidationResult contains the primary result of the chain validation routine: valid, valid but untrusted, invalid, or undefined.
• ChainValidationDetails provides the details of the factors that contributed to the chain validation result, such as an outdated certificate, a missing CRL, or a missing CA certificate.

Checking Signature Coverage

Because of these specifics of the PDF format, it is crucially important to understand which part of the document is covered by a specific signature. Use the CoverageEndsAt field of the associated PDFSignature object to establish the scope of a signature. The revision of the document covered by that specific signature ranges from byte 0 to CoverageEndsAt. Alternatively, you can use the GetSignedVersion method to extract the signed revision to a file.

Chain Validation Setup

Note that these parameters apply to the Sign and Update methods in PDFSign as well as the Verify method in PDFVerify, as all three methods execute the chain validation procedure (if it is enabled).

Validation Policy

The ValidationPolicy property dictates how thoroughly the chain will be validated. It includes options to control which checks the component will perform, allowing you to tailor the validation process to meet your specific security needs. For example, if it is not essential to check each certificate's revocation status, set this property to vpFullNoRevocation.

Revocation

The revocation aspect of chain validation is controlled by the RevocationCheck property, which allows you to choose between and prioritize revocation origins. Note that OCSP sources are often preferred to CRL endpoints because of their real-time capability and the smaller size of the responses they produce.

Trust

The trust aspect of chain validation is controlled by the TrustSources property, which allows you to specify the locations in which the component will search for trust anchors. Local system stores, your own trusted root certificates (via the TrustedCerts property), and Trusted Lists (via the TrustedLists property) are all supported.

Offline Mode

The OfflineMode property provides the ability to verify the document without contacting online sources. If this property is enabled, the component will only use KnownCerts, TrustedCerts, data structures within the document itself, and revocation and Trusted List data that it previously saved to its internal cache when looking for missing validation material.

Property List

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

Method List

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

Event List

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

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

Attachments Property (PDFVerify Component)

A collection of all attached files found in the PDF document.

Syntax

• C#
• VB.NET

public PDFAttachmentList Attachments { get; }

Public Property Attachments As PDFAttachmentList

Remarks

This property is used to access the details of all the attached files identified in the document. Use the SaveAttachment method to save attachments from this collection.

This property is not available at design time.

BlockedCerts Property (PDFVerify Component)

The certificates that must be rejected as trust anchors.

Syntax

• C#
• VB.NET

public CertificateList BlockedCerts { get; }

Public Property BlockedCerts As CertificateList

Remarks

This property is used to supply a list of compromised or blocked certificates to the component. Note that any chain containing a blocked certificate will fail validation.

This property is not available at design time.

DecryptionCert Property (PDFVerify Component)

The decryption certificate.

Syntax

• C#
• VB.NET

public Certificate DecryptionCert { get; set; }

Public Property DecryptionCert As Certificate

Remarks

This property is used to provide the certificate used for decryption. Note that this certificate must have a private key associated with it.

This property is not available at design time.

DocumentCerts Property (PDFVerify Component)

A collection of certificates read from the document during processing.

Syntax

• C#
• VB.NET

public CertificateList DocumentCerts { get; }

Public ReadOnly Property DocumentCerts As CertificateList

Remarks

This property is used to access all certificates encountered during document processing and embedded into the signature(s). When signing or verifying, this collection will be populated automatically during chain validation.

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

Firewall Property (PDFVerify Component)

A set of properties related to firewall access.

Syntax

• C#
• VB.NET

public Firewall Firewall { get; set; }

Public Property Firewall As Firewall

Remarks

This is a Firewall-type property, which contains fields describing the firewall through which the component will attempt to connect.

InputData Property (PDFVerify Component)

A byte array containing the PDF document to process.

Syntax

• C#
• VB.NET

public byte[] InputData { get; set; }

Public Property InputData As Byte()

Remarks

This property is used to assign a byte array containing the PDF document to be processed.

This property is not available at design time.

InputFile Property (PDFVerify Component)

The PDF file to process.

Syntax

• C#
• VB.NET

public string InputFile { get; set; }

Public Property InputFile As String

Default Value

""

Remarks

This property is used to provide a path to the PDF document to be processed.

KnownCerts Property (PDFVerify Component)

A collection of additional certificates for chain validation.

Syntax

• C#
• VB.NET

public CertificateList KnownCerts { get; }

Public Property KnownCerts As CertificateList

Remarks

This property is used to supply a list of additional certificates to the component that might be needed for chain validation. For instance, intermediary CA certificates may be absent from the standard system locations (or there may be no standard system locations) and therefore should be supplied to the component manually.

The purpose of this certificate collection is roughly equivalent to that of the Intermediate Certification Authorities system store in Windows.

Note: Do not add trust anchors or root certificates to this collection; add them to TrustedCerts instead.

This property is not available at design time.

OfflineMode Property (PDFVerify Component)

Whether the component is operating in offline mode.

Syntax

• C#
• VB.NET

public bool OfflineMode { get; set; }

Public Property OfflineMode As Boolean

Default Value

False

Remarks

This property indicates whether the component should operate in offline mode.

In offline mode, the component restricts itself from accessing online Trusted Lists and revocation information sources such as CRLs or OCSP responders. It may be useful to set this property to true if there is a need to verify the completeness of the validation information included within the signature or provided via KnownCerts.

OutputData Property (PDFVerify Component)

A byte array containing the PDF document after processing.

Syntax

• C#
• VB.NET

public byte[] OutputData { get; }

Public ReadOnly Property OutputData As Byte()

Remarks

This property is used to read the byte array containing the produced output after the operation has completed. It will only be set if an output file and output stream have not been assigned via OutputFile and SetOutputStream respectively.

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

OutputFile Property (PDFVerify Component)

The path to a local file where the output will be written.

Syntax

• C#
• VB.NET

public string OutputFile { get; set; }

Public Property OutputFile As String

Default Value

""

Remarks

This property is used to provide a path where the resulting PDF document will be saved after the operation has completed.

Overwrite Property (PDFVerify Component)

Whether or not the component should overwrite files.

Syntax

• C#
• VB.NET

public bool Overwrite { get; set; }

Public Property Overwrite As Boolean

Default Value

False

Remarks

This property indicates whether or not the component will overwrite OutputFile, OutputData, or the stream set in SetOutputStream. If set to false, an error will be thrown whenever OutputFile, OutputData, or the stream set in SetOutputStream exists before an operation.

Password Property (PDFVerify Component)

The password to decrypt the document with.

Syntax

• C#
• VB.NET

public string Password { get; set; }

Public Property Password As String

Default Value

""

Remarks

This property is used to provide the user password for decryption. Though it may be different from OwnerPassword, most implementations use the same value for both.

Proxy Property (PDFVerify Component)

A set of properties related to proxy access.

Syntax

• C#
• VB.NET

public Proxy Proxy { get; set; }

Public Property Proxy As Proxy

Remarks

This property contains fields describing the proxy through which the component will attempt to connect.

RevocationCheck Property (PDFVerify Component)

The kind(s) of revocation check to perform for all chain certificates.

Syntax

• C#
• VB.NET

public PDFVerifyRevocationChecks RevocationCheck { get; set; }

enum PDFVerifyRevocationChecks {
  rcAllCRL,
  rcAllOCSP,
  rcAllCRLAndOCSP,
  rcAnyCRL,
  rcAnyOCSP,
  rcAnyCRLOrOCSP,
  rcAnyOCSPOrCRL
}

Public Property RevocationCheck As PdfverifyRevocationChecks

Enum PDFVerifyRevocationChecks
  rcAllCRL
  rcAllOCSP
  rcAllCRLAndOCSP
  rcAnyCRL
  rcAnyOCSP
  rcAnyCRLOrOCSP
  rcAnyOCSPOrCRL
End Enum

Default Value

6

Remarks

This property is used to specify the revocation sources and preferences the component will use during chain validation. Revocation checking is necessary to ensure the integrity of the chain and to obtain up-to-date certificate validity and trust information.

Certificate Revocation Lists (CRLs) and Online Certificate Status Protocol (OCSP) responses serve the same purpose of ensuring that the certificate has not been revoked by the Certificate Authority (CA) at the time of use. Depending on the circumstances and security policy requirements, either one or both of the revocation information source types may be used.

Possible values are:

This property controls the way revocation checks are performed for every certificate in the chain. Typically, certificates come with two types of revocation information sources: CRLs (Certificate Revocation Lists) and OCSP responses. CRLs are static objects periodically published by the CA at some online location. OCSP responders are active online services maintained by the CA that can provide up-to-date information on certificate statuses in near real time.

There are some conceptual differences between the two. CRLs are normally larger in size. Their use involves some latency because there is normally a delay between the time at which a certificate was revoked and the time at which the subsequent CRL mentioning that revocation is published. The benefits of CRLs are that the same object can provide statuses for all certificates issued by a particular CA, and that the whole technology is much simpler than OCSP (and thus is supported by more CAs).

This property allows the validation course to be adjusted by including or excluding certain types of revocation sources from the validation process. The rcAnyOCSPOrCRL setting (give preference to the faster OCSP route and only demand one source to succeed) is a good choice for most typical validation environments. The rcAll* modes are much stricter, and may be used in scenarios where bulletproof validity information is essential.

Note: If no CRL or OCSP endpoints are provided by the CA, the revocation check will be considered successful. This is because the CA chose not to supply revocation information for its certificates, meaning they are considered irrevocable.

Note: Within each of the above settings, if any retrieved CRL or OCSP response indicates that the certificate has been revoked, the revocation check fails.

Signatures Property (PDFVerify Component)

A collection of all the signatures and empty fields found in the PDF document.

Syntax

• C#
• VB.NET

public PDFSignatureList Signatures { get; }

Public ReadOnly Property Signatures As PDFSignatureList

Remarks

This property is used to access the details of all the signatures and empty signature fields identified in the document.

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

TrustedCerts Property (PDFVerify Component)

A collection of trusted certificates for chain validation.

Syntax

• C#
• VB.NET

public CertificateList TrustedCerts { get; }

Public Property TrustedCerts As CertificateList

Remarks

This property is used to supply a list of trusted certificates to the component that might be needed for chain validation. For instance, root CA certificates may be absent from the standard system locations (or there may be no standard system locations) and therefore should be supplied to the component manually.

The purpose of this certificate collection is largely the same as that of the Windows Trusted Root Certification Authorities system store.

Use this property with extreme care as it directly affects chain verifiability; a wrong certificate added to the list of trusted certificates may result in bad chains being accepted and forfeited signatures being recognized as genuine. Only add certificates that originate from parties that are known and trusted.

This property is not available at design time.

TrustedLists Property (PDFVerify Component)

A list of known Trusted Lists for chain validation.

Syntax

• C#
• VB.NET

public string TrustedLists { get; set; }

Public Property TrustedLists As String

Default Value

"%EUTL%"

Remarks

This property is used to supply a semicolon-separated list of URLs or paths of known Trusted Lists to the component for chain validation.

A Trusted List is an XML document that contains a government-issued list of CAs that have passed regulated compliance checks. When validating the chain, the component will consult the Trusted List to establish certificate trust, ensuring that the CA is legitimate and entitled to issue certificates of the kind being checked.

The default value is the special %EUTL% macro, which, if applicable, instructs the component to check the root certificate against up-to-date versions of the primary EU Trusted Lists from the EU LOTL. Custom values can be appended: component.TrustedLists = "%EUTL%;http://my.company/tsl;c:\tsls\mytsl.xml"; Note: The component will cache all Trusted Lists it downloads and uses during chain validation. This cache is shared between component instances within the same process. If this property contains a URL that is also present in the cache, the component will retrieve the cached data and reuse them in the current validation. If the data are invalid, the component will download a fresh Trusted List and add it to the cache.

TrustSources Property (PDFVerify Component)

The trust sources to use during chain validation.

Syntax

• C#
• VB.NET

public PDFVerifyTrustSources TrustSources { get; set; }

enum PDFVerifyTrustSources {
  tsManual,
  tsLocal,
  tsTrustedLists,
  tsLocalAndTrustedLists
}

Public Property TrustSources As PdfverifyTrustSources

Enum PDFVerifyTrustSources
  tsManual
  tsLocal
  tsTrustedLists
  tsLocalAndTrustedLists
End Enum

Default Value

3

Remarks

This property is used to specify the sources the component will use to establish certificate trust during chain validation.

Establishing trust for a particular certificate, when either signing or verifying, involves building a chain up to a valid trust anchor. This trust anchor is a root certificate that typically resides on the local system. If the certificate does not eventually chain up to a valid trust anchor, the chain is considered untrusted and therefore invalid.

Possible values are:

ValidationFlags Property (PDFVerify Component)

Additional chain validation settings.

Syntax

• C#
• VB.NET

public int ValidationFlags { get; set; }

Public Property ValidationFlags As Integer

Default Value

0

Remarks

This property is used to specify additional settings that affect the overall flow of the chain validation.

Its value should be provided as a bitmask of the following flags:

ValidationPolicy Property (PDFVerify Component)

The level at which to perform chain validation.

Syntax

• C#
• VB.NET

public PDFVerifyValidationPolicies ValidationPolicy { get; set; }

enum PDFVerifyValidationPolicies {
  vpNone,
  vpFull,
  vpFullNoTrust,
  vpFullNoRevocation,
  vpBestEffort
}

Public Property ValidationPolicy As PdfverifyValidationPolicies

Enum PDFVerifyValidationPolicies
  vpNone
  vpFull
  vpFullNoTrust
  vpFullNoRevocation
  vpBestEffort
End Enum

Default Value

1

Remarks

This property is used to specify the overall validation policy the component will follow.

Possible values are:

Validation Policy Heuristics

Creating a new signature:

• For a basic signature with or without a timestamp, chain validation is not required, so it is recommended to use vpNone. This policy may also be used in test environments or on offline systems.
• For an LTV signature, use vpFull or vpFullNoTrust depending on whether trust checks are necessary in the current environment. If the signature is being created in an environment that does not match the prospective validation environment, consider vpFullNoTrust to validate the chain properly and fully without expecting good trust.

Updating or extending an existing signature:

• When updating a basic signature to LTV, similarly use vpFull or vpFullNoTrust as above.
• When extending an LTV signature, similarly use vpFull or vpFullNoTrust as above.

Validating an existing signature:

• For basic signature validation, use vpFullNoRevocation if trust checks, but not revocation checks, are necessary in the current environment. This policy may also be used on offline systems if the trust anchor is already available to the component.
• For archival validation, use vpFull to validate the chain properly and fully. This policy expects the trust anchor and all the revocation material to be available.

ValidationTime Property (PDFVerify Component)

The time point at which the signature should be validated.

Syntax

• C#
• VB.NET

public string ValidationTime { get; set; }

Public Property ValidationTime As String

Default Value

""

Remarks

This property is used to specify the moment in time at which the signature validity should be established. The time should be provided in UTC in yyyyMMddHHmmssZ format.

Leave this property empty to stick to the default time point. The component will then prioritize:

• The signature creation time if the signature contains a signature timestamp (ValidatedSigningTime), or
• The local time included in the signature by the signer (ClaimedSigningTime).

Close Method (PDFVerify Component)

Closes an opened PDF document.

Syntax

• C#
• VB.NET

public void Close();

Async Version
public async Task Close();
public async Task Close(CancellationToken cancellationToken);

Public Sub Close()

Async Version
Public Sub Close() As Task
Public Sub Close(cancellationToken As CancellationToken) As Task

Remarks

This method is used to close the previously opened document specified in InputFile, InputData, or SetInputStream. It should always be preceded by a call to the Open method.

Example: component.InputFile = "input.pdf"; component.Open(); // Some operation component.Close();

If any changes are made to the document, they will be saved automatically to OutputFile, OutputData, or the stream set in SetOutputStream when this method is called. To configure this saving behavior, set the SaveChanges configuration setting.

Config Method (PDFVerify Component)

Sets or retrieves a configuration setting.

Syntax

• C#
• VB.NET

public string Config(string configurationString);

Async Version
public async Task<string> Config(string configurationString);
public async Task<string> Config(string configurationString, CancellationToken cancellationToken);

Public Function Config(ByVal ConfigurationString As String) As String

Async Version
Public Function Config(ByVal ConfigurationString As String) As Task(Of String)
Public Function Config(ByVal ConfigurationString As String, cancellationToken As CancellationToken) As Task(Of 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.

Encrypted Method (PDFVerify Component)

Checks whether a PDF document is encrypted.

Syntax

• C#
• VB.NET

public bool Encrypted();

Async Version
public async Task<bool> Encrypted();
public async Task<bool> Encrypted(CancellationToken cancellationToken);

Public Function Encrypted() As Boolean

Async Version
Public Function Encrypted() As Task(Of Boolean)
Public Function Encrypted(cancellationToken As CancellationToken) As Task(Of Boolean)

Remarks

This method is used to determine whether or not the document specified in InputFile, InputData, or SetInputStream is encrypted. It will return false if the document is pseudo-encrypted with an empty password.

Example: component.InputFile = "input.pdf"; if (component.Encrypted()) { // Set Password or DecryptionCert } component.Open(); // Some operation component.Close(); Note: If the document is not already opened, this method will open it, perform the operation, then close it.

GetPageProperty Method (PDFVerify Component)

Retrieves the value of a page property.

Syntax

• C#
• VB.NET

public string GetPageProperty(int page, string property);

Async Version
public async Task<string> GetPageProperty(int page, string property);
public async Task<string> GetPageProperty(int page, string property, CancellationToken cancellationToken);

Public Function GetPageProperty(ByVal Page As Integer, ByVal Property As String) As String

Async Version
Public Function GetPageProperty(ByVal Page As Integer, ByVal Property As String) As Task(Of String)
Public Function GetPageProperty(ByVal Page As Integer, ByVal Property As String, cancellationToken As CancellationToken) As Task(Of String)

Remarks

This method is used to read general information about the pages of the document specified in InputFile, InputData, or SetInputStream, such as their dimensions and content positioning details.

The Page parameter specifies the page to read information about, and the Property parameter specifies the page property to read. The latter can take one of the following values:

Note: Each page property is only populated once the document has been loaded, which is reported by the DocumentInfo event.

Example: int pageCount = 0; component.OnDocumentInfo += (s, e) => { pageCount = e.PageCount; }; component.InputFile = "input.pdf"; component.Open(); for (int i = 1; i <= pageCount; i++) component.GetPageProperty(i, "Height"); component.Close(); The page properties can be used to adjust the position of the signature widget based on the page dimensions. For example: int x = int.Parse(pdfsign.GetPageProperty(1, "Width")) - 100; int y = int.Parse(pdfsign.GetPageProperty(1, "Height")) - 100; pdfsign.SetWidgetProperty("OffsetX", x.ToString()); pdfsign.SetWidgetProperty("OffsetY", y.ToString()); Note: If the document is not already opened, this method will open it, perform the operation, then close it.

GetSignedVersion Method (PDFVerify Component)

Returns the part of a signed PDF document that is covered by the signature.

Syntax

• C#
• VB.NET

public void GetSignedVersion(int signatureIndex);

Async Version
public async Task GetSignedVersion(int signatureIndex);
public async Task GetSignedVersion(int signatureIndex, CancellationToken cancellationToken);

Public Sub GetSignedVersion(ByVal SignatureIndex As Integer)

Async Version
Public Sub GetSignedVersion(ByVal SignatureIndex As Integer) As Task
Public Sub GetSignedVersion(ByVal SignatureIndex As Integer, cancellationToken As CancellationToken) As Task

Remarks

This method is used to retrieve the revision of the document specified in InputFile, InputData, or SetInputStream that is covered by the signature specified by SignatureIndex. The extracted revision will be saved to OutputFile, OutputData, or the stream set in SetOutputStream.

The SignatureIndex parameter is the index of the signature of interest in the Signatures collection.

Example: pdfverify.InputFile = "signed.pdf"; pdfverify.OutputFile = "revision0.pdf"; pdfverify.GetSignedVersion(0); PDF documents often use an incremental update approach, with any changes being appended to the document without altering the existing revision. This may lead to situations where a signature only covers part of the document (one of the past revisions), but not subsequent changes. This method provides a means to extract the revision that is actually certified by the signature.

It is recommended to use this method when validating signatures to make sure the signature covers the byte range it is expected to cover.

An alternative to this method is to check the CoverageEndsAt field of the signature object and match it to the document length.

Note: If the document is not already opened, this method will open it, perform the operation, then close it.

Interrupt Method (PDFVerify Component)

Interrupts the current action.

Syntax

• C#
• VB.NET

public void Interrupt();

Async Version
public async Task Interrupt();
public async Task Interrupt(CancellationToken cancellationToken);

Public Sub Interrupt()

Async Version
Public Sub Interrupt() As Task
Public Sub Interrupt(cancellationToken As CancellationToken) As Task

Remarks

This method interrupts the current action. It can be used, for example, within the ChainCert event to abort the chain validation procedure.

If there is no action in progress, this method simply returns, doing nothing.

Open Method (PDFVerify Component)

Opens a PDF document for processing.

Syntax

• C#
• VB.NET

public void Open();

Async Version
public async Task Open();
public async Task Open(CancellationToken cancellationToken);

Public Sub Open()

Async Version
Public Sub Open() As Task
Public Sub Open(cancellationToken As CancellationToken) As Task

Remarks

This method is used to open the document specified in InputFile, InputData, or SetInputStream before performing some operation on it, such as signing, updating, verifying signatures, or removing signatures. When finished, call Close to complete or discard the operation.

It is recommended to use this method (alongside Close) when performing multiple operations on the document at once.

Automatic Decryption Functionality

Once the correct decryption material is supplied, the component will then attempt to decrypt the document automatically within this method. When this occurs, the decrypted content is kept in memory so that the document's encrypted status is preserved when it is saved later. Use the Decrypt method to save a decrypted copy of the document instead.

Reset Method (PDFVerify Component)

Resets the component.

Syntax

• C#
• VB.NET

public void Reset();

Async Version
public async Task Reset();
public async Task Reset(CancellationToken cancellationToken);

Public Sub Reset()

Async Version
Public Sub Reset() As Task
Public Sub Reset(cancellationToken As CancellationToken) As Task

Remarks

This method is used to reset the component's properties and configuration settings to their default values.

SaveAttachment Method (PDFVerify Component)

Saves a PDF attachment to a file.

Syntax

• C#
• VB.NET

public void SaveAttachment(int index, string fileName);

Async Version
public async Task SaveAttachment(int index, string fileName);
public async Task SaveAttachment(int index, string fileName, CancellationToken cancellationToken);

Public Sub SaveAttachment(ByVal Index As Integer, ByVal FileName As String)

Async Version
Public Sub SaveAttachment(ByVal Index As Integer, ByVal FileName As String) As Task
Public Sub SaveAttachment(ByVal Index As Integer, ByVal FileName As String, cancellationToken As CancellationToken) As Task

Remarks

This method is used to retrieve the contents of an attachment from the document specified in InputFile, InputData, or SetInputStream and save it to the file specified by FileName. It does not modify the existence of the Attachments collection's contents.

The Index parameter is the index of the attachment in the Attachments collection to be saved.

The FileName parameter specifies the filename that the attachment will be saved to.

Example: component.InputFile = "input_with_attachment.pdf"; component.Open(); component.SaveAttachment(0, "a.dat"); component.Close(); Example (saving to a stream): component.InputFile = "input_with_attachment.pdf"; component.Attachments[0].OutputStream = myStream; component.SaveAttachment(0, null); // null means use the OutputStream field if it's not null Note: If the document is not already opened, this method will open it, perform the operation, then close it.

SetInputStream Method (PDFVerify Component)

Sets the stream containing the PDF document to process.

Syntax

• C#
• VB.NET

public void SetInputStream(System.IO.Stream inputStream);

Async Version
public async Task SetInputStream(System.IO.Stream inputStream);
public async Task SetInputStream(System.IO.Stream inputStream, CancellationToken cancellationToken);

Public Sub SetInputStream(ByVal InputStream As System.IO.Stream)

Async Version
Public Sub SetInputStream(ByVal InputStream As System.IO.Stream) As Task
Public Sub SetInputStream(ByVal InputStream As System.IO.Stream, cancellationToken As CancellationToken) As Task

Remarks

This method is used to set the stream from which the component will read the PDF document to be processed. If an input stream is set before the component attempts to perform operations on the document, the component will read the data from the input stream instead of from the InputFile or InputData properties.

Note: It may be useful to additionally set the CloseInputStreamAfterProcessing configuration setting to true when using input streams.

SetOutputStream Method (PDFVerify Component)

Sets the stream to write the processed document to.

Syntax

• C#
• VB.NET

public void SetOutputStream(System.IO.Stream outputStream);

Async Version
public async Task SetOutputStream(System.IO.Stream outputStream);
public async Task SetOutputStream(System.IO.Stream outputStream, CancellationToken cancellationToken);

Public Sub SetOutputStream(ByVal OutputStream As System.IO.Stream)

Async Version
Public Sub SetOutputStream(ByVal OutputStream As System.IO.Stream) As Task
Public Sub SetOutputStream(ByVal OutputStream As System.IO.Stream, cancellationToken As CancellationToken) As Task

Remarks

This method is used to set the stream to which the component will write the resulting PDF document. If an output stream is set before the component attempts to perform operations on the document, the component will write the data to the output stream instead of writing to OutputFile or populating OutputData.

Note: It may be useful to additionally set the CloseOutputStreamAfterProcessing configuration setting to true when using output streams.

Signed Method (PDFVerify Component)

Checks whether a PDF document is signed.

Syntax

• C#
• VB.NET

public bool Signed();

Async Version
public async Task<bool> Signed();
public async Task<bool> Signed(CancellationToken cancellationToken);

Public Function Signed() As Boolean

Async Version
Public Function Signed() As Task(Of Boolean)
Public Function Signed(cancellationToken As CancellationToken) As Task(Of Boolean)

Remarks

This method is used to determine whether or not the document specified in InputFile, InputData, or SetInputStream is signed. It will return false if the document contains only empty signature fields.

Example: pdfverify.InputFile = "input.pdf"; if (pdfverify.Signed()) { // Configure validation-related properties as desired pdfverify.Verify(); } Note: If the document is not already opened, this method will open it, perform the operation, then close it.

Unsign Method (PDFVerify Component)

Removes a signature from a PDF document.

Syntax

• C#
• VB.NET

public void Unsign(int signatureIndex, int unsignKind);

Async Version
public async Task Unsign(int signatureIndex, int unsignKind);
public async Task Unsign(int signatureIndex, int unsignKind, CancellationToken cancellationToken);

Public Sub Unsign(ByVal SignatureIndex As Integer, ByVal UnsignKind As Integer)

Async Version
Public Sub Unsign(ByVal SignatureIndex As Integer, ByVal UnsignKind As Integer) As Task
Public Sub Unsign(ByVal SignatureIndex As Integer, ByVal UnsignKind As Integer, cancellationToken As CancellationToken) As Task

Remarks

This method is used to remove an existing signature specified by SignatureIndex from the document specified in InputFile, InputData, or SetInputStream. The document with the removed signature will be saved to OutputFile, OutputData, or the stream set in SetOutputStream.

The SignatureIndex parameter is the index of the signature in the Signatures collection to be removed.

The UnsignKind parameter specifies the kind of unsign to perform. Possible values are:

Example: pdfverify.InputFile = "signed.pdf"; pdfverify.OutputFile = "unsigned.pdf"; pdfverify.Open(); int idx = pdfverify.Signatures.Count - 1; pdfverify.Unsign(idx, 0); // uskFull pdfverify.Close(); Note that unsigning is different from GetSignedVersion. The latter returns the revision of the document including the mentioned signature (thus removing anything after that signature was created). Unsign removes the signature completely by carving it out of the document.

Note: SignatureIndex set to -1 removes all signatures in the document.

Note: If the document is not already opened, this method will open it, perform the operation, then close it.

Verify Method (PDFVerify Component)

Verifies a signed PDF document.

Syntax

• C#
• VB.NET

public void Verify();

Async Version
public async Task Verify();
public async Task Verify(CancellationToken cancellationToken);

Public Sub Verify()

Async Version
Public Sub Verify() As Task
Public Sub Verify(cancellationToken As CancellationToken) As Task

Remarks

This method is used to validate all signatures in the document specified in InputFile, InputData, or SetInputStream.

This method walks through the signed document and reports every signature via the SignatureInfo event. Subscribe to the event to be notified about the signatures and adjust validation settings on the fly.

Upon completion of this method, the signature details will be published in the Signatures property.

Example: pdfverify.InputFile = "signed.pdf"; pdfverify.Verify(); PDFSignature signature = pdfverify.Signatures[0]; if (signature.SignatureValidationResult == SignatureValidationResults.svrValid) Console.WriteLine("Signature is good"); if (signature.ChainValidationResult == ChainValidationResults.cvrValid) Console.WriteLine("Chain is good"); This method only validates the signatures and does not check their coverage. It is a good idea to use mechanisms such as GetSignedVersion or CoverageEndsAt to ensure that the signature covers the expected document revision.

To control individual signature validation, subscribe to the SignatureInfo event and set the ValidateSignature and ValidateChain parameters accordingly. The results are reported via the SignatureProcessed event.

Use the following properties to adjust chain validation parameters:

• BlockedCerts
• KnownCerts
• OfflineMode
• RevocationCheck
• TrustedCerts
• TrustedLists
• TrustSources
• ValidationFlags
• ValidationPolicy
• ValidationTime

Note: If the document is not already opened, this method will open it, perform the operation, then close it.

ChainCert Event (PDFVerify Component)

Fired when the component encounters a chain certificate.

Syntax

• C#
• VB.NET

public event OnChainCertHandler OnChainCert;

public delegate void OnChainCertHandler(object sender, PDFVerifyChainCertEventArgs e);

public class PDFVerifyChainCertEventArgs : EventArgs {
  public string CertEncoded { get; }
  public byte[] CertEncodedB { get; }
  public string CertSubject { get; }
  public string CertIssuer { get; }
  public string ValidationTime { get; }
  public int ValidationResult { get; set; }
  public int ValidationDetails { get; set; }
}

Public Event OnChainCert As OnChainCertHandler

Public Delegate Sub OnChainCertHandler(sender As Object, e As PDFVerifyChainCertEventArgs)

Public Class PDFVerifyChainCertEventArgs Inherits EventArgs
  Public ReadOnly Property CertEncoded As String
  Public ReadOnly Property CertEncodedB As Byte()
  Public ReadOnly Property CertSubject As String
  Public ReadOnly Property CertIssuer As String
  Public ReadOnly Property ValidationTime As String
  Public Property ValidationResult As Integer
  Public Property ValidationDetails As Integer
End Class

Remarks

This event is fired once for each certificate encountered during chain validation to report that it is about to be processed. The component will try to retrieve all required chain certificates automatically.

The CertEncoded parameter specifies the PEM (Base64-encoded) public certificate.

The CertSubject and CertIssuer parameters specify the distinguished names of the certificate owner and issuer respectively.

The ValidationTime parameter specifies the time point (in UTC) at which the certificate validity was established.

The ValidationResult parameter reports the outcome of the individual certificate validation and can be one of the following values:

In the case of a failure, the ValidationDetails parameter provides more details on its reasons. Its value is a bitmask of the following flags:

Overridable Chain Validation

For example, set ValidationResult to cvrValid and ValidationDetails to 0 in order to:

• Ignore CA or TLS key usage requirements
• Ignore the AuthorityKeyId extension in certificate-issuing CAs (helps with incorrectly renewed certificates)
• Ignore the Basic Constraints or Name Constraints extensions of CA certificates
• Tolerate some weaker algorithms
• Implicitly trust self-signed certificates
• Skip validity period checks for trusted certificates (helps with older devices that have expired root certificates)
• Ignore chain loops (helps with buggy CAs that include subchains that sign themselves)

Note: The user code is ultimately responsible for certificate validity decisions made via these two parameters. If their values are modified within this event, the resulting chain validation procedure may deviate from the standard.

DocumentInfo Event (PDFVerify Component)

Fired when the document has been loaded into memory.

Syntax

• C#
• VB.NET

public event OnDocumentInfoHandler OnDocumentInfo;

public delegate void OnDocumentInfoHandler(object sender, PDFVerifyDocumentInfoEventArgs e);

public class PDFVerifyDocumentInfoEventArgs : EventArgs {
  public int PageCount { get; }
  public int SignatureCount { get; }
}

Public Event OnDocumentInfo As OnDocumentInfoHandler

Public Delegate Sub OnDocumentInfoHandler(sender As Object, e As PDFVerifyDocumentInfoEventArgs)

Public Class PDFVerifyDocumentInfoEventArgs Inherits EventArgs
  Public ReadOnly Property PageCount As Integer
  Public ReadOnly Property SignatureCount As Integer
End Class

Remarks

This event is fired once per document processing routine to report that the document has been processed and loaded into memory.

The handler for this event is a good place to check the document structure and access document-related information such as page number and document file details. These may be useful when preparing the signature. For example, the GetPageProperty method can be used to find the optimal position for the signature widget.

The PageCount parameter reports the number of pages in the document.

The SignatureCount parameter reports the number of signatures in the document.

This event is fired when the Open method is called, but only after Password or RecipientInfo is fired (if applicable) and the document has been decrypted.

This event will populate the Attachments, DocumentCerts, and Signatures collections with any corresponding objects found in the document.

Error Event (PDFVerify Component)

Fired when information is available about errors during data delivery.

Syntax

• C#
• VB.NET

public event OnErrorHandler OnError;

public delegate void OnErrorHandler(object sender, PDFVerifyErrorEventArgs e);

public class PDFVerifyErrorEventArgs : EventArgs {
  public int ErrorCode { get; }
  public string Description { get; }
}

Public Event OnError As OnErrorHandler

Public Delegate Sub OnErrorHandler(sender As Object, e As PDFVerifyErrorEventArgs)

Public Class PDFVerifyErrorEventArgs Inherits EventArgs
  Public ReadOnly Property ErrorCode As Integer
  Public ReadOnly Property Description As String
End Class

Remarks

The Error event is fired in case of exceptional conditions during message processing. Normally the component throws an exception.

The ErrorCode parameter contains an error code, and the Description parameter contains a textual description of the error. For a list of valid error codes and their descriptions, please refer to the Error Codes section.

Log Event (PDFVerify Component)

Fired once for each log message.

Syntax

• C#
• VB.NET

public event OnLogHandler OnLog;

public delegate void OnLogHandler(object sender, PDFVerifyLogEventArgs e);

public class PDFVerifyLogEventArgs : EventArgs {
  public int LogLevel { get; }
  public string Message { get; }
  public string LogType { get; }
}

Public Event OnLog As OnLogHandler

Public Delegate Sub OnLogHandler(sender As Object, e As PDFVerifyLogEventArgs)

Public Class PDFVerifyLogEventArgs Inherits EventArgs
  Public ReadOnly Property LogLevel As Integer
  Public ReadOnly Property Message As String
  Public ReadOnly Property LogType As String
End Class

Remarks

This event is fired once for each log message generated by the component. The verbosity is controlled by the LogLevel configuration setting.

The LogLevel parameter indicates the detail level of the message. Possible values are:

The Message parameter is the log message.

The LogType parameter identifies the type of log entry. Possible values are:

• CertValidator
• Font
• HTTP
• PDFInvalidSignature
• PDFRevocationInfo
• Timestamp
• TSL

Password Event (PDFVerify Component)

Fired when the component detects that the PDF document is encrypted with a password.

Syntax

• C#
• VB.NET

public event OnPasswordHandler OnPassword;

public delegate void OnPasswordHandler(object sender, PDFVerifyPasswordEventArgs e);

public class PDFVerifyPasswordEventArgs : EventArgs {
  public bool Available { get; }
  public bool Cancel { get; set; }
}

Public Event OnPassword As OnPasswordHandler

Public Delegate Sub OnPasswordHandler(sender As Object, e As PDFVerifyPasswordEventArgs)

Public Class PDFVerifyPasswordEventArgs Inherits EventArgs
  Public ReadOnly Property Available As Boolean
  Public Property Cancel As Boolean
End Class

Remarks

This event is fired during document processing to report that the document is encrypted with a password. It may be used to supply the correct decryption password to the Password property.

The Available parameter indicates whether the decryption password is already available to the component or still needs to be set. If this parameter is set to false, the correct password must be provided for the decryption attempt to succeed.

The Cancel parameter determines whether the component will stop firing this event to request a password.

RecipientInfo Event (PDFVerify Component)

Fired for each recipient certificate of the encrypted PDF document.

Syntax

• C#
• VB.NET

public event OnRecipientInfoHandler OnRecipientInfo;

public delegate void OnRecipientInfoHandler(object sender, PDFVerifyRecipientInfoEventArgs e);

public class PDFVerifyRecipientInfoEventArgs : EventArgs {
  public string Issuer { get; }
  public string SerialNumber { get; }
  public string SubjectKeyIdentifier { get; }
  public bool Available { get; }
  public bool Cancel { get; set; }
}

Public Event OnRecipientInfo As OnRecipientInfoHandler

Public Delegate Sub OnRecipientInfoHandler(sender As Object, e As PDFVerifyRecipientInfoEventArgs)

Public Class PDFVerifyRecipientInfoEventArgs Inherits EventArgs
  Public ReadOnly Property Issuer As String
  Public ReadOnly Property SerialNumber As String
  Public ReadOnly Property SubjectKeyIdentifier As String
  Public ReadOnly Property Available As Boolean
  Public Property Cancel As Boolean
End Class

Remarks

This event is fired during document processing for each recipient certificate that the document has been encrypted for (if applicable). It may be used to identify the certificate(s) to load and supply to the DecryptionCert property.

The Issuer parameter specifies the subject of the issuer certificate.

The SerialNumber parameter specifies the serial number of the encryption certificate.

The SubjectKeyIdentifier parameter specifies the X.509 subjectKeyIdentifier extension value of the encryption certificate, encoded as a hex string.

The Available parameter indicates whether the decryption certificate is already available to the component or still needs to be set. If this parameter is set to false, the correct certificate must be provided for the decryption attempt to succeed.

The Cancel parameter determines whether the component will stop firing this event to request a certificate.

Note: The document may be encrypted with more than one certificate (or have "more than one recipient"), in which case each certificate will cause its own invocation of this event.

SignatureInfo Event (PDFVerify Component)

Fired when the component finds a signature in the document.

Syntax

• C#
• VB.NET

public event OnSignatureInfoHandler OnSignatureInfo;

public delegate void OnSignatureInfoHandler(object sender, PDFVerifySignatureInfoEventArgs e);

public class PDFVerifySignatureInfoEventArgs : EventArgs {
  public int SignatureIndex { get; }
  public bool ValidateSignature { get; set; }
  public bool ValidateChain { get; set; }
}

Public Event OnSignatureInfo As OnSignatureInfoHandler

Public Delegate Sub OnSignatureInfoHandler(sender As Object, e As PDFVerifySignatureInfoEventArgs)

Public Class PDFVerifySignatureInfoEventArgs Inherits EventArgs
  Public ReadOnly Property SignatureIndex As Integer
  Public Property ValidateSignature As Boolean
  Public Property ValidateChain As Boolean
End Class

Remarks

This event is fired once for each signature found in the document to report that the signature specified by SignatureIndex is about to be validated.

The SignatureIndex parameter is the index of the signature in the Signatures collection.

Signature validation consists of two independent stages: cryptographic signature validation and chain validation. The ValidateSignature and ValidateChain parameters determine whether each stage should be included in the validation. They can be overridden to modify the validation policy on a per-signature basis, allowing signatures to be verified individually instead of all at once (via Verify). To skip validation entirely, set both parameters to false.

Use the following properties to adjust chain validation parameters:

• BlockedCerts
• KnownCerts
• OfflineMode
• RevocationCheck
• TrustedCerts
• TrustedLists
• TrustSources
• ValidationFlags
• ValidationPolicy
• ValidationTime

SignatureProcessed Event (PDFVerify Component)

Fired after a signature has been processed.

Syntax

• C#
• VB.NET

public event OnSignatureProcessedHandler OnSignatureProcessed;

public delegate void OnSignatureProcessedHandler(object sender, PDFVerifySignatureProcessedEventArgs e);

public class PDFVerifySignatureProcessedEventArgs : EventArgs {
  public int SignatureIndex { get; }
  public int SignatureValidationResult { get; }
  public int ChainValidationResult { get; }
  public int ChainValidationDetails { get; }
}

Public Event OnSignatureProcessed As OnSignatureProcessedHandler

Public Delegate Sub OnSignatureProcessedHandler(sender As Object, e As PDFVerifySignatureProcessedEventArgs)

Public Class PDFVerifySignatureProcessedEventArgs Inherits EventArgs
  Public ReadOnly Property SignatureIndex As Integer
  Public ReadOnly Property SignatureValidationResult As Integer
  Public ReadOnly Property ChainValidationResult As Integer
  Public ReadOnly Property ChainValidationDetails As Integer
End Class

Remarks

This event is fired once for each signature found in the document to report that the signature specified by SignatureIndex has completed validation. It is fired after SignatureInfo if that event's ValidateSignature parameter is set to true.

The SignatureIndex parameter is the index of the signature in the Signatures collection.

Signature validation consists of two independent stages: cryptographic signature validation and chain validation. Separate validation results are reported for each in the SignatureValidationResult and ChainValidationResult parameters.

The former reports the validity of the signature and can be one of the following values:

The latter reports the validity of the chain and can be one of the following values:

In the case of a failure, the ChainValidationDetails parameter provides more details on its reasons. Its value is a bitmask of the following flags:

Note: SignatureValidationResult, ChainValidationResult, and ChainValidationDetails are also available as fields in the PDFSignature type.

SSLServerAuthentication Event (PDFVerify Component)

Fired after the server presents its certificate to the client.

Syntax

• C#
• VB.NET

public event OnSSLServerAuthenticationHandler OnSSLServerAuthentication;

public delegate void OnSSLServerAuthenticationHandler(object sender, PDFVerifySSLServerAuthenticationEventArgs e);

public class PDFVerifySSLServerAuthenticationEventArgs : EventArgs {
  public string CertEncoded { get; }
  public byte[] CertEncodedB { get; }
  public string CertSubject { get; }
  public string CertIssuer { get; }
  public string Status { get; }
  public bool Accept { get; set; }
}

Public Event OnSSLServerAuthentication As OnSSLServerAuthenticationHandler

Public Delegate Sub OnSSLServerAuthenticationHandler(sender As Object, e As PDFVerifySSLServerAuthenticationEventArgs)

Public Class PDFVerifySSLServerAuthenticationEventArgs Inherits EventArgs
  Public ReadOnly Property CertEncoded As String
  Public ReadOnly Property CertEncodedB As Byte()
  Public ReadOnly Property CertSubject As String
  Public ReadOnly Property CertIssuer As String
  Public ReadOnly Property Status As String
  Public Property Accept As Boolean
End Class

Remarks

This event is fired during timestamping or chain validation after the server presents its SSL/TLS certificate to the component. It only applies if the TSA, CRL, OCSP, or Trusted List endpoint operates over HTTPS.

During this event, the client can decide whether or not to continue with the connection process. The Accept parameter is a recommendation on whether to continue or close the connection. This is just a suggestion: application software must use its own logic to determine whether or not to continue.

When the Accept parameter is false, the Status parameter shows why the verification failed (otherwise, Status contains the string OK). If it is decided to continue, you can override and accept the certificate by setting the Accept parameter to true.

SSLStatus Event (PDFVerify Component)

Fired when secure connection progress messages are available.

Syntax

• C#
• VB.NET

public event OnSSLStatusHandler OnSSLStatus;

public delegate void OnSSLStatusHandler(object sender, PDFVerifySSLStatusEventArgs e);

public class PDFVerifySSLStatusEventArgs : EventArgs {
  public string Message { get; }
}

Public Event OnSSLStatus As OnSSLStatusHandler

Public Delegate Sub OnSSLStatusHandler(sender As Object, e As PDFVerifySSLStatusEventArgs)

Public Class PDFVerifySSLStatusEventArgs Inherits EventArgs
  Public ReadOnly Property Message As String
End Class

Remarks

This event is fired during timestamping or chain validation for informational and logging purposes only. This event tracks the progress of the SSL/TLS connection. It only applies if the TSA, CRL, OCSP, or Trusted List endpoint operates over HTTPS.

Certificate Type

This is the digital certificate being used.

Remarks

This type describes the current digital certificate. The certificate may be a public or private key. The fields are used to identify or select certificates.

Fields

Constructors

• C#
• VB.NET

public Certificate();

Public Certificate()

• C#
• VB.NET

public Certificate(string certificateFile);

Public Certificate(ByVal CertificateFile As String)

• C#
• VB.NET

public Certificate(byte[] encoded);

Public Certificate(ByVal Encoded As Byte())

• C#
• VB.NET

public Certificate(CertStoreTypes storeType, string store, string storePassword, string subject);

Public Certificate(ByVal StoreType As CertStoreTypes, ByVal Store As String, ByVal StorePassword As String, ByVal Subject As String)

• C#
• VB.NET

public Certificate(CertStoreTypes storeType, string store, string storePassword, string subject, string configurationString);

Public Certificate(ByVal StoreType As CertStoreTypes, ByVal Store As String, ByVal StorePassword As String, ByVal Subject As String, ByVal ConfigurationString As String)

• C#
• VB.NET

public Certificate(CertStoreTypes storeType, string store, string storePassword, byte[] encoded);

Public Certificate(ByVal StoreType As CertStoreTypes, ByVal Store As String, ByVal StorePassword As String, ByVal Encoded As Byte())

• C#
• VB.NET

public Certificate(CertStoreTypes storeType, byte[] store, string storePassword, string subject);

Public Certificate(ByVal StoreType As CertStoreTypes, ByVal Store As Byte(), ByVal StorePassword As String, ByVal Subject As String)

• C#
• VB.NET

public Certificate(CertStoreTypes storeType, byte[] store, string storePassword, string subject, string configurationString);

Public Certificate(ByVal StoreType As CertStoreTypes, ByVal Store As Byte(), ByVal StorePassword As String, ByVal Subject As String, ByVal ConfigurationString As String)

• C#
• VB.NET

public Certificate(CertStoreTypes storeType, byte[] store, string storePassword, byte[] encoded);

Public Certificate(ByVal StoreType As CertStoreTypes, ByVal Store As Byte(), ByVal StorePassword As String, ByVal Encoded As Byte())

Firewall Type

The firewall the component will connect through.

Remarks

When connecting through a firewall, this type is used to specify different properties of the firewall, such as the firewall Host and the FirewallType.

Fields

Constructors

• C#
• VB.NET

public Firewall();

Public Firewall()

PDFAttachment Type

This describes the file being attached to the PDF document.

Remarks

This type contains information about the file that is being attached to the document.

Fields

Constructors

• C#
• VB.NET

public PDFAttachment();

Public PDFAttachment()

• C#
• VB.NET

public PDFAttachment(string fileName);

Public PDFAttachment(ByVal FileName As String)

• C#
• VB.NET

public PDFAttachment(string fileName, string description);

Public PDFAttachment(ByVal FileName As String, ByVal Description As String)

• C#
• VB.NET

public PDFAttachment(byte[] data, string name, string description);

Public PDFAttachment(ByVal Data As Byte(), ByVal Name As String, ByVal Description As String)

• C#
• VB.NET

public PDFAttachment(System.IO.Stream inputStream, string name, string description);

Public PDFAttachment(ByVal InputStream As System.IO.Stream, ByVal Name As String, ByVal Description As String)

PDFSignature Type

A container for PDF signature details.

Remarks

This type contains details about the signature. Use it to read information about the signature when processing it.

Fields

Constructors

• C#
• VB.NET

public PDFSignature();

Public PDFSignature()

Proxy Type

The proxy the component will connect to.

Remarks

When connecting through a proxy, this type is used to specify different properties of the proxy, such as the Server and the AuthScheme.

Fields

Constructors

• C#
• VB.NET

public Proxy();

Public Proxy()

• C#
• VB.NET

public Proxy(string server, int port);

Public Proxy(ByVal Server As String, ByVal Port As Integer)

• C#
• VB.NET

public Proxy(string server, int port, string user, string password);

Public Proxy(ByVal Server As String, ByVal Port As Integer, ByVal User As String, ByVal Password As String)

Config Settings (PDFVerify Component)

PDFVerify Config Settings

Base Config Settings

Trappable Errors (PDFVerify Component)

PDFVerify Errors

PDF Errors

Parsing Errors

The component may also return one of the following error codes, which are inherited from other components.

HTTP Errors

The component may also return one of the following error codes, which are inherited from other components.

TCPClient Errors

SSL Errors

TCP/IP Errors