(VB.NET) RSA Sign utf-8 Byte Representation of String

Demontstrates how to sign the utf-8 byte representation of a string.

Note: This example requires Chilkat v11.0.0 or greater.

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Dim success As Boolean = False

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

' Load an RSA private key for signing.
Dim privKey As New Chilkat.PrivateKey
success = privKey.LoadEncryptedPemFile("qa_data/pem/rsa_passwd.pem","passwd")
If (success = False) Then
    Debug.WriteLine(privKey.LastErrorText)
    Exit Sub
End If


Dim rsa As New Chilkat.Rsa
success = rsa.UsePrivateKey(privKey)
If (success = False) Then
    Debug.WriteLine(rsa.LastErrorText)
    Exit Sub
End If


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

' Indicate that we want the utf-8 byte representation of the string to be signed
rsa.Charset = "utf-8"

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

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