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Ed25519ph Sign and Verify

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Demonstrates how to create an Ed25519ph signature, and then to verify it.

Note: This example requires Chilkat v9.5.0.91 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.

;  Use the following test vector from https://www.rfc-editor.org/rfc/rfc8032#page-30

;     -----TEST abc
;  
;     ALGORITHM:
;     Ed25519ph
;  
;     SECRET KEY:
;     833fe62409237b9d62ec77587520911e
;     9a759cec1d19755b7da901b96dca3d42
;  
;     PUBLIC KEY:
;     ec172b93ad5e563bf4932c70e1245034
;     c35467ef2efd4d64ebf819683467e2bf
;  
;     MESSAGE (length 3 bytes):
;     616263
;  
;     SIGNATURE:
;     98a70222f0b8121aa9d30f813d683f80
;     9e462b469c7ff87639499bb94e6dae41
;     31f85042463c2a355a2003d062adf5aa
;     a10b8c61e636062aaad11c2a26083406

Local $sPrivKeyHex = "833fe62409237b9d62ec77587520911e9a759cec1d19755b7da901b96dca3d42"
Local $sPubKeyHex = "ec172b93ad5e563bf4932c70e1245034c35467ef2efd4d64ebf819683467e2bf"

$oPrivKey = ObjCreate("Chilkat.PrivateKey")
$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.AppendEncoded("616263","hex")

$oEddsa = ObjCreate("Chilkat.EdDSA")
;  Indicate we want the Ed25519ph instance.
$oEddsa.Algorithm = "Ed25519ph"

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

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

;  The expected output is: 98a70222f0b8121aa9d30f813d683f80....

;  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 Ed25519ph signature is verified!" & @CRLF)