CertificateSignFile (Function)

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Validity of certificate
Managing certificates in WEBDEV

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CertificateSignFile (Function)

In french: CertificatSigneFichier

Creates the signature of a file. This signature can be stored in a Buffer variable or in a text file.

Example

MyCertificate is Certificate

// Open the certificate picker of Windows
MyCertificate = CertificateSelect()

// Cancellation or error
IF MyCertificate.Name = "" THEN
RETURN
END

// Checks whether the selected certificate is valid for signing
IF MyCertificate.ValidForSignature = False THEN
Info("The selected certificate cannot be used to generate a signature.")
RETURN
END

// Retrieve the buffer containing the signature
bufSignature is Buffer
bufSignature = CertificateSignFile(FullFileName, MyCertificate)

// Save the signature in a file for a future check
fSaveBuffer(MySignatureFile, bufSignature)

Syntax

<Result> = CertificateSignFile(<File path> , <Certificate> [, <Signature file>])

<Result>: Buffer

Signature of the file. This buffer can be used later by CertificateCheckBufferSignatureFile to check the correspondence between the signature and the file.

<File path>: Character string

Name and full (or relative) path of the file for which a signature will be created.

<Certificate>: Certificate variable

Name of Certificate variable containing the certificate that will be used to create the signature of the file.

<Signature file>: Optional character string

Name and full (or relative) path of the file containing the signature. This file can be used later by CertificateCheckFileSignatureFile to check the correspondence between the signature and the file.

Remarks

Validity of certificate

Before signing a file, it is recommended to check the validity of the certificate (ValidForSignature property of the Certificate variable). This property is used to find out whether the certificate owns a private key as well as all the characteristics required to perform a signature. CertificateSignFile returns an error if this property is set to False.

Managing certificates in WEBDEV

In order for the certificates to be visible to the site user, they must be installed on the server in the store of custom certificates of the Internet user.

Component: wd300std.dll