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(Xojo Plugin) About RSA Public/Private KeysThis 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. Note: This example requires Chilkat v11.0.0 or greater.
Dim success As Boolean success = False Dim cert As New Chilkat.Cert // Load a digital certificate. success = cert.LoadFromFile("digitalCert.cer") If (success = False) Then System.DebugLog(cert.LastErrorText) Return End If // A .cer file does not contain the private key. It should contain // the public key... Dim pubKey As New Chilkat.PublicKey success = cert.GetPublicKey(pubKey) // Let's have a look at it (in XML format). System.DebugLog("Public Key from Certificate:") System.DebugLog(pubKey.GetXml()) // 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 Chilkat.PrivateKey success = privKey.LoadAnyFormatFile("PrivateKey.key","") If (success <> True) Then System.DebugLog(privKey.LastErrorText) Return 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...). System.DebugLog("Private Key from DER:") System.DebugLog(privKey.GetXml()) |
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