Xojo Plugin

RSA Signature with Certificate's Private Key from PFX

See more RSA Examples

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

Dim success As Boolean
success = False

// 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:
success = certStore.LoadPfxFile("chilkat.pfx","test")
If (success = False) Then
    System.DebugLog(certStore.LastErrorText)
    Return
End If

// Find the certificate by the subject common name:
Dim jsonCN As New Chilkat.JsonObject
success = jsonCN.UpdateString("CN","cert common name")

Dim cert As New Chilkat.Cert
success = certStore.FindCert(jsonCN,cert)
If (success = False) Then
    System.DebugLog(certStore.LastErrorText)
    Return
End If

Dim privKey As New Chilkat.PrivateKey
success = cert.GetPrivateKey(privKey)
If (success = False) Then
    System.DebugLog(cert.LastErrorText)
    Return
End If

Dim rsa As New Chilkat.Rsa

success = rsa.UsePrivateKey(privKey)
If (success = False) 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!")