Visual Basic 6.0

Create PKCS1 RSA Signature with PEM Private Key

See more RSA Examples

Demonstrates how to load a private key from a PEM file and create a PKCS1 RSA digital signature. 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 pkey As New PrivateKey

' Load the private key from an RSA PEM file:
success = pkey.LoadPemFile("pvkey2_rsa.pem")
If (success = 0) Then
    Debug.Print pkey.LastErrorText
    Exit Sub
End If

Dim rsa As New ChilkatRsa

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

' Get the signature as hex.
rsa.EncodingMode = "hex"

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

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

Debug.Print hexSig

Debug.Print "Success!"