(PowerShell) Ed25519 Sign and Verify

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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Add-Type -Path "C:\chilkat\ChilkatDotNet47-9.5.0-x64\ChilkatDotNet47.dll"

# This example assumes the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.

$privKeyHex = "1498b5467a63dffa2dc9d9e069caf075d16fc33fdd4c3b01bfadae6433767d93"
$pubKeyHex = "b7a3c12dc0c8c748ab07525b701122b88bd78f600c76342d27f25e5f92444cde"

$privKey = New-Object 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.
$success = $privKey.LoadEd25519($privKeyHex,$pubKeyHex)
if ($success -eq $false) {
    $($privKey.LastErrorText)
    exit
}

# The data to be signed...
$bd = New-Object Chilkat.BinData
$bd.AppendString("Message for Ed25519 signing","utf-8")

$eddsa = New-Object Chilkat.EdDSA
$hexSig = $eddsa.SignBdENC($bd,"hexlower",$privKey)

$("signature = " + $hexSig)

# The expected output is: 6dd355667fae4eb43c6e0ab92e870edb2de0a88cae12dbd8591507f584fe4912babff497f1b8edf9567d2483d54ddc6459bea7855281b7a246a609e3001a4e08

# Verify the signature..
$pubKey = New-Object Chilkat.PublicKey
$success = $pubKey.LoadEd25519($pubKeyHex)
if ($success -eq $false) {
    $($pubKey.LastErrorText)
    exit
}

$bVerified = $eddsa.VerifyBdENC($bd,$hexSig,"hexlower",$pubKey)
if ($bVerified -eq $false) {
    $($eddsa.LastErrorText)
    $("Failed to verify the signature.")
    exit
}

$("The Ed25519 signature is verified!")