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Ed25519 Key Exchange (Shared Secret)

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

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

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Local $bSuccess = 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

Local $sAlicePrivKey = "77076d0a7318a57d3c16c17251b26645df4c2f87ebc0992ab177fba51db92c2a"
Local $sBobPubKey = "de9edb7d7b7dc1b4d35b61c2ece435373f8343c85b78674dadfc7e146f882b4f"

$oPrivKey = ObjCreate("Chilkat.PrivateKey")
; 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.
$bSuccess = $oPrivKey.LoadEd25519($sAlicePrivKey,"")
If ($bSuccess = False) Then
    ConsoleWrite($oPrivKey.LastErrorText & @CRLF)
    Exit
EndIf

$oPubKey = ObjCreate("Chilkat.PublicKey")
$bSuccess = $oPubKey.LoadEd25519($sBobPubKey)
If ($bSuccess = False) Then
    ConsoleWrite($oPubKey.LastErrorText & @CRLF)
    Exit
EndIf

; Create the shared secret:
$oEddsa = ObjCreate("Chilkat.EdDSA")
Local $sharedSecret = $oEddsa.SharedSecretENC($oPrivKey,$oPubKey,"hexlower")
If ($oEddsa.LastMethodSuccess = False) Then
    ConsoleWrite($oEddsa.LastErrorText & @CRLF)
    Exit
EndIf

ConsoleWrite("Computed: " & $sharedSecret & @CRLF)
ConsoleWrite("Expected: 4a5d9d5ba4ce2de1728e3bf480350f25e07e21c947d19e3376f09b3c1e161742" & @CRLF)