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(Visual Basic 6.0) About RSA Public/Private Keys

This example provides some additional information for understanding public/private key pairs. In demonstrates how a private key is a superset of the public key. A public key contains the modulus and exponent. The matching private key also contains the modulus and exponent, but also contains the additional private key parts.

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

Dim cert As New ChilkatCert

Dim success As Long

'  Load a digital certificate.
success = cert.LoadFromFile("digitalCert.cer")
If (success <> 1) Then
    Text1.Text = Text1.Text & cert.LastErrorText & vbCrLf
    Exit Sub
End If

Dim pubKey As PublicKey

'  A .cer file does not contain the private key.  It should contain
'  the public key...
Set pubKey = cert.ExportPublicKey()

'  Let's have a look at it (in XML format).
Text1.Text = Text1.Text & "Public Key from Certificate:" & vbCrLf
Text1.Text = Text1.Text & pubKey.GetXml() & vbCrLf

'  An RSA public key consists of a modulus and exponent.

'  An RSA private key includes both the modulus and exponent,
'  as well as other "big" numbers: P, Q, D, etc.

'  Let's load an RSA private key from a DER-encoded file:
Dim privKey As New PrivateKey

success = privKey.LoadRsaDerFile("PrivateKey.key")
If (success <> 1) Then
    Text1.Text = Text1.Text & privKey.LastErrorText & vbCrLf

    Exit Sub
End If

'  If this private key is the matching half to the public key from
'  the certificate, then the modulus and exponent should
'  be identical.  (Thus, a "private key" really contains both the public part as well as the private parts...).
Text1.Text = Text1.Text & "Private Key from DER:" & vbCrLf
Text1.Text = Text1.Text & privKey.GetXml() & vbCrLf


 

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