(VB.NET) Duplicate openssl dgst -md5 -sign myKey.pem something.txt | openssl enc -base64 -A

Demonstrates how to duplicate the creation of an RSA signature produced by this OpenSSL command:

openssl dgst -md5 -sign myKey.pem something.txt | openssl enc -base64 -A

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

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Dim success As Boolean = False

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

Dim pkey As New Chilkat.PrivateKey

' Load the private key from an RSA PEM file:
success = pkey.LoadPemFile("myKey.pem")

Dim rsa As New Chilkat.Rsa

' Import the private key into the RSA component:
success = rsa.UsePrivateKey(pkey)
If (success = False) Then
    Debug.WriteLine(rsa.LastErrorText)
    Exit Sub
End If


' OpenSSL uses BigEndian byte ordering:
rsa.LittleEndian = False

' The resulting signature will be a Base64 string:
rsa.EncodingMode = "base64"

' For simplicity, we're not loading
' the data to be signed from a file.  We are instead simply
' using a literal string value.  
Dim strData As String = "This is the text to be signed."

' Hash the input using MD5, and then sign the hash:
' Other valid hash algorithm choices are "md2" and "sha-1".
Dim base64Sig As String = rsa.SignStringENC(strData,"md5")

Debug.WriteLine(base64Sig)

Debug.WriteLine("Success!")