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(Go) 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. Note: This example requires Chilkat v11.0.0 or greater.
// 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... var success bool // ----------------------------------------------------------------- // (Client-Side) Generate an ECC key, save the public part to a file. // ----------------------------------------------------------------- prngClient := Prng_Ref.html">chilkat.NewPrng() eccClient := Ecc_Ref.html">chilkat.NewEcc() privKeyClient := PrivateKey_Ref.html">chilkat.NewPrivateKey() success = eccClient.GenKey("secp256r1",prngClient,privKeyClient) if success == false { fmt.Println(eccClient.LastErrorText()) prngClient.DisposePrng() eccClient.DisposeEcc() privKeyClient.DisposePrivateKey() return } pubKeyClient := PublicKey_Ref.html">chilkat.NewPublicKey() privKeyClient.ToPublicKey(pubKeyClient) pubKeyClient.SavePemFile(false,"qa_output/eccClientPub.pem") // ----------------------------------------------------------------- // (Server-Side) Generate an ECC key, save the public part to a file. // ----------------------------------------------------------------- prngServer := Prng_Ref.html">chilkat.NewPrng() eccServer := Ecc_Ref.html">chilkat.NewEcc() privKeyServer := PrivateKey_Ref.html">chilkat.NewPrivateKey() eccServer.GenKey("secp256r1",prngServer,privKeyServer) pubKeyServer := PublicKey_Ref.html">chilkat.NewPublicKey() privKeyServer.ToPublicKey(pubKeyServer) pubKeyServer.SavePemFile(false,"qa_output/eccServerPub.pem") // ----------------------------------------------------------------- // (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. pubKeyFromServer := PublicKey_Ref.html">chilkat.NewPublicKey() pubKeyFromServer.LoadFromFile("qa_output/eccServerPub.pem") sharedSecret1 := eccClient.SharedSecretENC(privKeyClient,pubKeyFromServer,"base64") // ----------------------------------------------------------------- // (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. pubKeyFromClient := PublicKey_Ref.html">chilkat.NewPublicKey() pubKeyFromClient.LoadFromFile("qa_output/eccClientPub.pem") sharedSecret2 := eccServer.SharedSecretENC(privKeyServer,pubKeyFromClient,"base64") // --------------------------------------------------------- // Examine the shared secrets. They should be the same. // Both sides now have a secret that only they know. // --------------------------------------------------------- fmt.Println(*sharedSecret1) fmt.Println(*sharedSecret2) prngClient.DisposePrng() eccClient.DisposeEcc() privKeyClient.DisposePrivateKey() pubKeyClient.DisposePublicKey() prngServer.DisposePrng() eccServer.DisposeEcc() privKeyServer.DisposePrivateKey() pubKeyServer.DisposePublicKey() pubKeyFromServer.DisposePublicKey() pubKeyFromClient.DisposePublicKey() |
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