(Visual Basic 6.0) RSA Sign using Base64 Private Key

Signs a string using a non-encrypted RSA private key in base64 encoding. Returns the RSA signature as a base64 string.

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

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

Dim success As Long
success = 0

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

Dim privKey As New PrivateKey

Dim sbPem As New ChilkatStringBuilder
success = sbPem.AppendLine("-----BEGIN RSA PRIVATE KEY-----",1)
success = sbPem.AppendLine("MIIC .... j5A==",1)
success = sbPem.AppendLine("-----END RSA PRIVATE KEY-----",1)

success = privKey.LoadPem(sbPem.GetAsString())
If (success = 0) Then
    Debug.Print privKey.LastErrorText
    Exit Sub
End If

Dim rsa As New ChilkatRsa

success = rsa.UsePrivateKey(privKey)
If (success = 0) Then
    Debug.Print rsa.LastErrorText
    Exit Sub
End If

Dim bd As New ChilkatBinData
success = bd.AppendString("12345678","utf-8")

success = rsa.SignRawBd(bd)
If (success = 0) Then
    Debug.Print rsa.LastErrorText
    Exit Sub
End If

' Get the base64 RSA signature.
Debug.Print bd.GetEncoded("base64")

success = rsa.VerifyRawBd(bd)
If (success = 0) Then
    Debug.Print rsa.LastErrorText
    Exit Sub
End If

Dim strOriginal As String
strOriginal = bd.GetString("utf-8")
Debug.Print strOriginal