Go

Ed25519 Key Exchange (Shared Secret)

See more Ed25519 Examples

Demonstrates how to create an Ed25519 shared secret for use in key exchange.

Note: This example requires Chilkat v9.5.0.83 or greater.

Go

    success := false

    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    // Alice's private key, a:
    //     77076d0a7318a57d3c16c17251b26645df4c2f87ebc0992ab177fba51db92c2a
    // Alice's public key, X25519(a, 9):
    //     8520f0098930a754748b7ddcb43ef75a0dbf3a0d26381af4eba4a98eaa9b4e6a
    // Bob's private key, b:
    //     5dab087e624a8a4b79e17f8b83800ee66f3bb1292618b6fd1c2f8b27ff88e0eb
    // Bob's public key, X25519(b, 9):
    //     de9edb7d7b7dc1b4d35b61c2ece435373f8343c85b78674dadfc7e146f882b4f
    // Their shared secret, K:
    //     4a5d9d5ba4ce2de1728e3bf480350f25e07e21c947d19e3376f09b3c1e161742

    alicePrivKey := "77076d0a7318a57d3c16c17251b26645df4c2f87ebc0992ab177fba51db92c2a"
    bobPubKey := "de9edb7d7b7dc1b4d35b61c2ece435373f8343c85b78674dadfc7e146f882b4f"

    privKey := chilkat.NewPrivateKey()
    // This example shows only one way of loading an Ed25519 private key.
    // Chilkat can load other formats (JWK, PEM, ASN.1 DER, etc.)  
    // You may do so by calling LoadAnyFormat or LoadAnyFormatFile.
    success = privKey.LoadEd25519(alicePrivKey,"")
    if success == false {
        fmt.Println(privKey.LastErrorText())
        privKey.DisposePrivateKey()
        return
    }

    pubKey := chilkat.NewPublicKey()
    success = pubKey.LoadEd25519(bobPubKey)
    if success == false {
        fmt.Println(pubKey.LastErrorText())
        privKey.DisposePrivateKey()
        pubKey.DisposePublicKey()
        return
    }

    // Create the shared secret:
    eddsa := chilkat.NewEdDSA()
    sharedSecret := eddsa.SharedSecretENC(privKey,pubKey,"hexlower")
    if eddsa.LastMethodSuccess() == false {
        fmt.Println(eddsa.LastErrorText())
        privKey.DisposePrivateKey()
        pubKey.DisposePublicKey()
        eddsa.DisposeEdDSA()
        return
    }

    fmt.Println("Computed: ", *sharedSecret)
    fmt.Println("Expected: 4a5d9d5ba4ce2de1728e3bf480350f25e07e21c947d19e3376f09b3c1e161742")

    privKey.DisposePrivateKey()
    pubKey.DisposePublicKey()
    eddsa.DisposeEdDSA()