(PowerShell) Ed25519ph Sign and Verify

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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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.

# 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

$privKeyHex = "833fe62409237b9d62ec77587520911e9a759cec1d19755b7da901b96dca3d42"
$pubKeyHex = "ec172b93ad5e563bf4932c70e1245034c35467ef2efd4d64ebf819683467e2bf"

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

# The data to be signed...
$bd = New-Object Chilkat.BinData
$bd.AppendEncoded("616263","hex")

$eddsa = New-Object Chilkat.EdDSA
# Indicate we want the Ed25519ph instance.
$eddsa.Algorithm = "Ed25519ph"

$hexSig = $eddsa.SignBdENC($bd,"hexlower",$privKey)

$("signature = " + $hexSig)

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

# 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 Ed25519ph signature is verified!")