(Xojo Plugin) RSA Signature with Certificate's Private Key from PFX

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Demonstrates how to use a certificate's private key from a PFX file to create an RSA signature.

Chilkat Xojo Plugin Download Xojo Plugin for Windows, Linux, Mac OS X, and ARM, ARM64

// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

// Create an instance of a certificate store object, load a PFX file,
// locate the certificate we need, and use it for signing.
// (a PFX file may contain more than one certificate.)
Dim certStore As New Chilkat.CertStore

// The 1st argument is the filename, the 2nd arg is the 
// PFX file's password:
Dim success As Boolean
success = certStore.LoadPfxFile("chilkat.pfx","test")
If (success <> True) Then
    System.DebugLog(certStore.LastErrorText)
    Return
End If

Dim cert As Chilkat.Cert
cert = certStore.FindCertBySubject("Chilkat Software, Inc.")
If (certStore.LastMethodSuccess = False) Then
    System.DebugLog(certStore.LastErrorText)
    Return
End If

Dim pkey As Chilkat.PrivateKey
pkey = cert.ExportPrivateKey()
If (cert.LastMethodSuccess = False) Then
    System.DebugLog(cert.LastErrorText)

    Return
End If

// Get the private key in XML format:
Dim pkeyXml As String
pkeyXml = pkey.GetXml()

Dim rsa As New Chilkat.Rsa

// Import the private key into the RSA component:
success = rsa.ImportPrivateKey(pkeyXml)
If (success <> True) Then
    System.DebugLog(rsa.LastErrorText)

    Return
End If

// Encode the signature as a hex string
rsa.EncodingMode = "hex"

Dim strData As String
strData = "This is the string to be signed."

// Sign the string using the sha-1 hash algorithm.
// Other valid choices are "sha-256", "md2" and "md5".
Dim hexSig As String
hexSig = rsa.SignStringENC(strData,"sha-1")

System.DebugLog(hexSig)

System.DebugLog("Success!")