Visual Basic 6.0 Requires Chilkat v11.0.0+

RSA Sign Using Private Key from .pfx/.p12 to Base64 Signature

See more RSA Examples

Demonstrates how to RSA sign something using a private key loaded from a .pfx/.p12. The RSA signature is returned in Base64 encoded format. Visual Basic 6.0

Dim success As Long
success = 0

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

Dim rsa As New ChilkatRsa

'  Load the .pfx/.p12
Dim pfx As New ChilkatPfx
success = pfx.LoadPfxFile("qa_data/pfx/myKey.p12","myPassword")
If (success = 0) Then
    Debug.Print pfx.LastErrorText
    Exit Sub
End If

'  Get the default private key.

Dim privKey As New PrivateKey
success = pfx.PrivateKeyAt(0,privKey)
If (success = 0) Then
    Debug.Print pfx.LastErrorText
    Exit Sub
End If

'  Import the private key into the RSA component:
success = rsa.UsePrivateKey(privKey)
If (success = 0) Then
    Debug.Print rsa.LastErrorText
    Exit Sub
End If

'  Get the signature in base64
rsa.EncodingMode = "base64"

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

'  Sign the string using the sha256 hash algorithm.
'  Other valid choices are "sha384", "sha512", "sha-1", "md2" and "md5".
Dim base64Sig As String
base64Sig = rsa.SignStringENC(strData,"sha256")

Debug.Print base64Sig

Debug.Print "Success!"