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(Visual FoxPro) How to Generate an Elliptic Curve Shared SecretDemonstrates how to generate an ECC (Elliptic Curve Cryptography) shared secret. Imagine a cilent has one ECC private key, the server has another. A shared secret is computed by each side providing it's public key to the other. The private keys are kept private.
LOCAL lnSuccess LOCAL loPrngClient LOCAL loEccClient LOCAL loPrivKeyClient LOCAL loPubKeyClient LOCAL loPrngServer LOCAL loEccServer LOCAL loPrivKeyServer LOCAL loPubKeyServer LOCAL loPubKeyFromServer LOCAL lcSharedSecret1 LOCAL loPubKeyFromClient LOCAL lcSharedSecret2 * This example requires the Chilkat API to have been previously unlocked. * See Global Unlock Sample for sample code. * This example includes both client-side and server-side code. * Each code segment is marked as client-side or server-side. * Imagine these segments are running on separate computers... * ----------------------------------------------------------------- * (Client-Side) Generate an ECC key, save the public part to a file. * ----------------------------------------------------------------- * For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Prng') loPrngClient = CreateObject('Chilkat.Prng') * For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Ecc') loEccClient = CreateObject('Chilkat.Ecc') loPrivKeyClient = loEccClient.GenEccKey("secp256r1",loPrngClient) IF (loEccClient.LastMethodSuccess <> 1) THEN ? loEccClient.LastErrorText RELEASE loPrngClient RELEASE loEccClient CANCEL ENDIF loPubKeyClient = loPrivKeyClient.GetPublicKey() loPubKeyClient.SavePemFile(0,"qa_output/eccClientPub.pem") RELEASE loPubKeyClient * ----------------------------------------------------------------- * (Server-Side) Generate an ECC key, save the public part to a file. * ----------------------------------------------------------------- * For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Prng') loPrngServer = CreateObject('Chilkat.Prng') * For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Ecc') loEccServer = CreateObject('Chilkat.Ecc') loPrivKeyServer = loEccServer.GenEccKey("secp256r1",loPrngServer) IF (loEccServer.LastMethodSuccess <> 1) THEN ? loEccServer.LastErrorText RELEASE loPrngClient RELEASE loEccClient RELEASE loPrngServer RELEASE loEccServer CANCEL ENDIF loPubKeyServer = loPrivKeyServer.GetPublicKey() loPubKeyServer.SavePemFile(0,"qa_output/eccServerPub.pem") RELEASE loPubKeyServer * ----------------------------------------------------------------- * (Client-Side) Generate the shared secret using our private key, and the other's public key. * ----------------------------------------------------------------- * Imagine that the server sent the public key PEM to the client. * (This is simulated by loading the server's public key from the file. * For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.PublicKey') loPubKeyFromServer = CreateObject('Chilkat.PublicKey') loPubKeyFromServer.LoadFromFile("qa_output/eccServerPub.pem") lcSharedSecret1 = loEccClient.SharedSecretENC(loPrivKeyClient,loPubKeyFromServer,"base64") RELEASE loPrivKeyClient * ----------------------------------------------------------------- * (Server-Side) Generate the shared secret using our private key, and the other's public key. * ----------------------------------------------------------------- * Imagine that the client sent the public key PEM to the server. * (This is simulated by loading the client's public key from the file. * For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.PublicKey') loPubKeyFromClient = CreateObject('Chilkat.PublicKey') loPubKeyFromClient.LoadFromFile("qa_output/eccClientPub.pem") lcSharedSecret2 = loEccServer.SharedSecretENC(loPrivKeyServer,loPubKeyFromClient,"base64") RELEASE loPrivKeyServer * --------------------------------------------------------- * Examine the shared secrets. They should be the same. * Both sides now have a secret that only they know. * --------------------------------------------------------- ? lcSharedSecret1 ? lcSharedSecret2 RELEASE loPrngClient RELEASE loEccClient RELEASE loPrngServer RELEASE loEccServer RELEASE loPubKeyFromServer RELEASE loPubKeyFromClient |
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