B4X 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. B4X

Dim success As Boolean = False

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

Dim rsa As ChilkatRsa
rsa.Initialize

'  Load the .pfx/.p12
Dim pfx As ChilkatPfx
pfx.Initialize
success = pfx.LoadPfxFile("qa_data/pfx/myKey.p12", "myPassword")
If success = False Then
    Log(pfx.LastErrorText)
    Return
End If


'  Get the default private key.

Dim privKey As ChilkatPrivateKey
privKey.Initialize("privKey")
success = pfx.PrivateKeyAt(0, privKey)
If success = False Then
    Log(pfx.LastErrorText)
    Return
End If


'  Import the private key into the RSA component:
success = rsa.UsePrivateKey(privKey)
If success = False Then
    Log(rsa.LastErrorText)
    Return
End If


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

Dim strData As String = "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 = rsa.SignStringENC(strData, "sha256")

Log(base64Sig)

Log("Success!")