Visual FoxPro

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.

Visual FoxPro

LOCAL lnSuccess
LOCAL lcAlicePrivKey
LOCAL lcBobPubKey
LOCAL loPrivKey
LOCAL loPubKey
LOCAL loEddsa
LOCAL lcSharedSecret

lnSuccess = 0

*  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

lcAlicePrivKey = "77076d0a7318a57d3c16c17251b26645df4c2f87ebc0992ab177fba51db92c2a"
lcBobPubKey = "de9edb7d7b7dc1b4d35b61c2ece435373f8343c85b78674dadfc7e146f882b4f"

loPrivKey = CreateObject('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.
lnSuccess = loPrivKey.LoadEd25519(lcAlicePrivKey,"")
IF (lnSuccess = 0) THEN
    ? loPrivKey.LastErrorText
    RELEASE loPrivKey
    CANCEL
ENDIF

loPubKey = CreateObject('Chilkat.PublicKey')
lnSuccess = loPubKey.LoadEd25519(lcBobPubKey)
IF (lnSuccess = 0) THEN
    ? loPubKey.LastErrorText
    RELEASE loPrivKey
    RELEASE loPubKey
    CANCEL
ENDIF

*  Create the shared secret:
loEddsa = CreateObject('Chilkat.EdDSA')
lcSharedSecret = loEddsa.SharedSecretENC(loPrivKey,loPubKey,"hexlower")
IF (loEddsa.LastMethodSuccess = 0) THEN
    ? loEddsa.LastErrorText
    RELEASE loPrivKey
    RELEASE loPubKey
    RELEASE loEddsa
    CANCEL
ENDIF

? "Computed: " + lcSharedSecret
? "Expected: 4a5d9d5ba4ce2de1728e3bf480350f25e07e21c947d19e3376f09b3c1e161742"

RELEASE loPrivKey
RELEASE loPubKey
RELEASE loEddsa