(DataFlex) Sign PDF in PAdES (ETSI EN 319 142) standard

See more PDF Signatures Examples

Chilkat can sign PDF's to satisfy any of the different PDF signing levels, such as:

PAdES-Baseline: This is the basic level of PAdES compliance. It specifies the minimum requirements for creating an advanced electronic signature in a PDF document. PAdES-Baseline signatures typically include the signature itself, signer's identity information, and certificate validation data.

PAdES-B: PAdES-B is an extension of PAdES-Baseline that adds support for time-stamping the signature. Time-stamping ensures that the signature remains valid even after the expiration of the signer's certificate.

PAdES-LTV (Long-Term Validation), PAdES-LTA: PAdES-LTV adds additional features to ensure the long-term validity and integrity of signatures. It includes mechanisms for embedding validation-related information, such as certificate revocation status and validation policies, directly into the PDF document. This allows the signature to be validated even if the signer's certificate has expired or been revoked.

PAdES-T: PAdES-T is similar to PAdES-B, but it requires the use of a secure time-stamp from a trusted time-stamping authority. This provides additional assurance of the signature's time validity.

PAdES-C: PAdES-C adds support for multiple signers to sign the same PDF document sequentially or concurrently.

PAdES-X: PAdES-X is an extension of PAdES-Baseline that adds support for the use of external signature policies. External signature policies define additional requirements and constraints for creating and validating signatures.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

Use ChilkatAx-win32.pkg

Procedure Test
    Handle hoPdf
    Boolean iSuccess
    Variant vJson
    Handle hoJson
    Variant vCert
    Handle hoCert
    String sOutFilePath
    String sTemp1

    Get Create (RefClass(cComChilkatPdf)) To hoPdf
    If (Not(IsComObjectCreated(hoPdf))) Begin
        Send CreateComObject of hoPdf
    End

    // Load a PDF to be signed.
    Get ComLoadFile Of hoPdf "c:/someDir/my.pdf" To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoPdf To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // Options for signing are specified in JSON.
    Get Create (RefClass(cComChilkatJsonObject)) To hoJson
    If (Not(IsComObjectCreated(hoJson))) Begin
        Send CreateComObject of hoJson
    End

    // ---------------------------------------------------------------------
    // The JSON signing attributes are what controls the level of 
    // PAdES signature produced (i.e. PAdES-LTV, PAdES-B-LTA, etc)
    // 
    // The best way to know what attributes to provide, and the values for
    // for each attribute, is to find an already signed PDF that meets your 
    // requirements, and pass it to Chilkat's online tool at Generate PDF Signing Code
    // The online tool will analyze the signed PDF and will generate code with the
    // JSON signing attributes that will produce a signed PDF with the same features.
    Get ComUpdateString Of hoJson "subFilter" "/ETSI.CAdES.detached" To iSuccess
    Get ComUpdateBool Of hoJson "signingCertificateV2" True To iSuccess
    Get ComUpdateString Of hoJson "signingAlgorithm" "pkcs" To iSuccess
    Get ComUpdateString Of hoJson "hashAlgorithm" "sha256" To iSuccess

    // -----------------------------------------------------------
    // The following JSON settings define the signature appearance.
    Get ComUpdateInt Of hoJson "page" 1 To iSuccess
    Get ComUpdateString Of hoJson "appearance.y" "top" To iSuccess
    Get ComUpdateString Of hoJson "appearance.x" "left" To iSuccess
    Get ComUpdateString Of hoJson "appearance.fontScale" "10.0" To iSuccess
    Get ComUpdateString Of hoJson "appearance.text[0]" "Digitally signed by: cert_cn" To iSuccess
    Get ComUpdateString Of hoJson "appearance.text[1]" "current_dt" To iSuccess
    Get ComUpdateString Of hoJson "appearance.text[2]" "Hello 123 ABC" To iSuccess

    // --------------------------------------------------------------
    // Load the signing certificate. (Use your own certificate.)
    // Note: There are other methods for using a certificate on an HSM (smartcard or token)
    // or from other sources, such as a cloud HSM, a Windows installed certificate,
    // or other file formats.
    Get Create (RefClass(cComChilkatCert)) To hoCert
    If (Not(IsComObjectCreated(hoCert))) Begin
        Send CreateComObject of hoCert
    End
    Get ComLoadPfxFile Of hoCert "c:/myPfxFiles/myPdfSigningCert.pfx" "pfxPassword" To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoCert To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // Once we have the certificate object, tell the PDF object to use it for signing
    Get pvComObject of hoCert to vCert
    Get ComSetSigningCert Of hoPdf vCert To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoPdf To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // Sign the PDF, creating the output file.
    Move "c:/someDir/mySigned.pdf" To sOutFilePath
    Get pvComObject of hoJson to vJson
    Get ComSignPdf Of hoPdf vJson sOutFilePath To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoPdf To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Showln "Success."


End_Procedure