(Excel) 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.

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.

' 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 Chilkat.PrivateKey
Set privKey = Chilkat.NewPrivateKey

success = privKey.LoadAnyFormatFile("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
Dim success As Boolean
success = rsa.ImportPrivateKeyObj(privKey)


originalData = "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"


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