(VB.NET UWP/WinRT) RSA Sign with PKCS8 Encrypted Key

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Demonstrates how to load a private key from an encrypted PKCS8 file and create an RSA digital signature.

Chilkat Universal Windows Platform (UWP) / WinRT Downloads Chilkat for the Universal Windows Platform (UWP)

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

Dim pkey As New Chilkat.PrivateKey

' Load the private key from an RSA PEM file:
Dim success As Boolean = pkey.LoadPkcs8EncryptedFile("privateKey.key","myPassword")

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

Dim rsa As New Chilkat.Rsa

' Import the private key into the RSA object:
success = rsa.ImportPrivateKey(pkeyXml)
If (success <> True) Then
    Debug.WriteLine(rsa.LastErrorText)
    Exit Sub
End If


' Return the signature in hex
rsa.EncodingMode = "hex"

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

' Sign the string using the sha-1 hash algorithm.
' Other valid choices are "md2", "sha256", "sha384", "sha512",  and "md5".
Dim hexSig As String = rsa.SignStringENC(strData,"sha-1")

Debug.WriteLine(hexSig)