(Excel) RSA Sign utf-8 Byte Representation of String

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

Download Excel Class Modules Chilkat Excel Class Modules

' 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 Chilkat.PrivateKey
Set privKey = Chilkat.NewPrivateKey

success = privKey.LoadEncryptedPemFile("qa_data/pem/rsa_passwd.pem","passwd")
If (success <> True) Then
    Debug.Print privKey.LastErrorText
    Exit Sub
End If

Dim rsa As Chilkat.Rsa
Set rsa = Chilkat.NewRsa
success = rsa.ImportPrivateKeyObj(privKey)


originalData = "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"


sigBase64 = rsa.SignStringENC(originalData,"sha256")
Debug.Print sigBase64