(VB.NET) RSA Signature SHA256withRSA, iso-8859-1, base64

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RSA sign the iso-8859-1 byte representation of a string with SHA256withRSA, and return the signature in the base64 encoding.

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

' This example will duplicate the following Java code:
' 
' Signature sign = Signature.getInstance("SHA256withRSA");
' sign.initSign(privateKey);
' sign.update(original.getBytes(Charset.forName("ISO-8859-1")));
' 
' ...
' byte[] resultado = sign.sign();
' sello = encodeByteArrayToBase64(resultado);
' 

' Load an RSA private key for signing.
' You can load any format file.  This example loads a .pem, but you can provide path to any type of file holding a private key.
Dim privKey As New Chilkat.PrivateKey
Dim success As Boolean = privKey.LoadAnyFormatFile("qa_data/pem/rsa_passwd.pem","passwd")
If (success <> True) Then
    Debug.WriteLine(privKey.LastErrorText)
    Exit Sub
End If


Dim rsa As New Chilkat.Rsa
rsa.ImportPrivateKeyObj(privKey)

Dim originalData As String = "This is the string to be hashed an RSA signed."

' Indicate that we want the iso-8859-1 byte representation of the string to be signed
rsa.Charset = "iso-8859-1"

' We want the RSA signature in base64 format
rsa.EncodingMode = "base64"

Dim sigBase64 As String = rsa.SignStringENC(originalData,"sha256")
Debug.WriteLine(sigBase64)