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Ed25519 Sign and Verify

See more Ed25519 Examples

Demonstrates how to create an Ed25519 signature, and then to verify it.

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.

Local $sPrivKeyHex = "1498b5467a63dffa2dc9d9e069caf075d16fc33fdd4c3b01bfadae6433767d93"
Local $sPubKeyHex = "b7a3c12dc0c8c748ab07525b701122b88bd78f600c76342d27f25e5f92444cde"

$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 = $oPrivKey.LoadEd25519($sPrivKeyHex,$sPubKeyHex)
If ($bSuccess = False) Then
    ConsoleWrite($oPrivKey.LastErrorText & @CRLF)
    Exit
EndIf

; The data to be signed...
$oBd = ObjCreate("Chilkat.BinData")
$oBd.AppendString("Message for Ed25519 signing","utf-8")

$oEddsa = ObjCreate("Chilkat.EdDSA")
Local $sHexSig = $oEddsa.SignBdENC($oBd,"hexlower",$oPrivKey)

ConsoleWrite("signature = " & $sHexSig & @CRLF)

; The expected output is: 6dd355667fae4eb43c6e0ab92e870edb2de0a88cae12dbd8591507f584fe4912babff497f1b8edf9567d2483d54ddc6459bea7855281b7a246a609e3001a4e08

; Verify the signature..
$oPubKey = ObjCreate("Chilkat.PublicKey")
$bSuccess = $oPubKey.LoadEd25519($sPubKeyHex)
If ($bSuccess = False) Then
    ConsoleWrite($oPubKey.LastErrorText & @CRLF)
    Exit
EndIf

Local $bVerified = $oEddsa.VerifyBdENC($oBd,$sHexSig,"hexlower",$oPubKey)
If ($bVerified = False) Then
    ConsoleWrite($oEddsa.LastErrorText & @CRLF)
    ConsoleWrite("Failed to verify the signature." & @CRLF)
    Exit
EndIf

ConsoleWrite("The Ed25519 signature is verified!" & @CRLF)