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(Visual FoxPro) 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.
LOCAL lnSuccess LOCAL loCert LOCAL loPubKey LOCAL loPrivKey lnSuccess = 0 loCert = CreateObject('Chilkat.Cert') * Load a digital certificate. lnSuccess = loCert.LoadFromFile("digitalCert.cer") IF (lnSuccess = 0) THEN ? loCert.LastErrorText RELEASE loCert CANCEL ENDIF * A .cer file does not contain the private key. It should contain * the public key... loPubKey = CreateObject('Chilkat.PublicKey') loCert.GetPublicKey(loPubKey) * Let's have a look at it (in XML format). ? "Public Key from Certificate:" ? loPubKey.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: loPrivKey = CreateObject('Chilkat.PrivateKey') lnSuccess = loPrivKey.LoadAnyFormatFile("PrivateKey.key","") IF (lnSuccess <> 1) THEN ? loPrivKey.LastErrorText RELEASE loCert RELEASE loPubKey RELEASE loPrivKey CANCEL ENDIF * 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...). ? "Private Key from DER:" ? loPrivKey.GetXml() RELEASE loCert RELEASE loPubKey RELEASE loPrivKey |
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