(PowerBuilder) Ed25519 Key Exchange (Shared Secret)

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

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

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

integer li_rc
string ls_AlicePrivKey
string ls_BobPubKey
oleobject loo_PrivKey
integer li_Success
oleobject loo_PubKey
oleobject loo_Eddsa
string ls_SharedSecret

// 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

ls_AlicePrivKey = "77076d0a7318a57d3c16c17251b26645df4c2f87ebc0992ab177fba51db92c2a"
ls_BobPubKey = "de9edb7d7b7dc1b4d35b61c2ece435373f8343c85b78674dadfc7e146f882b4f"

loo_PrivKey = create oleobject
// Use "Chilkat_9_5_0.PrivateKey" for versions of Chilkat < 10.0.0
li_rc = loo_PrivKey.ConnectToNewObject("Chilkat.PrivateKey")
if li_rc < 0 then
    destroy loo_PrivKey
    MessageBox("Error","Connecting to COM object failed")
    return
end if
// 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.
li_Success = loo_PrivKey.LoadEd25519(ls_AlicePrivKey,"")
if li_Success = 0 then
    Write-Debug loo_PrivKey.LastErrorText
    destroy loo_PrivKey
    return
end if

loo_PubKey = create oleobject
// Use "Chilkat_9_5_0.PublicKey" for versions of Chilkat < 10.0.0
li_rc = loo_PubKey.ConnectToNewObject("Chilkat.PublicKey")

li_Success = loo_PubKey.LoadEd25519(ls_BobPubKey)
if li_Success = 0 then
    Write-Debug loo_PubKey.LastErrorText
    destroy loo_PrivKey
    destroy loo_PubKey
    return
end if

// Create the shared secret:
loo_Eddsa = create oleobject
// Use "Chilkat_9_5_0.EdDSA" for versions of Chilkat < 10.0.0
li_rc = loo_Eddsa.ConnectToNewObject("Chilkat.EdDSA")

ls_SharedSecret = loo_Eddsa.SharedSecretENC(loo_PrivKey,loo_PubKey,"hexlower")
if loo_Eddsa.LastMethodSuccess = 0 then
    Write-Debug loo_Eddsa.LastErrorText
    destroy loo_PrivKey
    destroy loo_PubKey
    destroy loo_Eddsa
    return
end if

Write-Debug "Computed: " + ls_SharedSecret
Write-Debug "Expected: 4a5d9d5ba4ce2de1728e3bf480350f25e07e21c947d19e3376f09b3c1e161742"


destroy loo_PrivKey
destroy loo_PubKey
destroy loo_Eddsa