(PowerShell) RSA Hash Binary Data and Sign (and Verify)

Demonstrates how to sign the hash of binary data. Also demonstrates how to verify the RSA signature.

Note: This example requires Chilkat v11.0.0 or greater.

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

$success = $false

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

# Load an RSA private key for signing.
$privKey = New-Object Chilkat.PrivateKey
$success = $privKey.LoadEncryptedPemFile("qa_data/pem/rsa_passwd.pem","passwd")
if ($success -eq $false) {
    $($privKey.LastErrorText)
    exit
}

$rsa = New-Object Chilkat.Rsa
$rsa.UsePrivateKey($privKey)

# We have some binary data (in hex) to sign
$originalData = "0102030405060708090A"
$bdData = New-Object Chilkat.BinData
$bdData.AppendEncoded($originalData,"hex")

# Hash (SHA-256) and sign the hash:
$bdSignature = New-Object Chilkat.BinData
$success = $rsa.SignBd($bdData,"sha256",$bdSignature)
if ($success -eq $false) {
    $($rsa.LastErrorText)
    exit
}

# Show the RSA signature in base64
$($bdSignature.GetEncoded("base64"))

# ------------------------------------------
# Get the public key from the private key
$pubKey = New-Object Chilkat.PublicKey
$privKey.ToPublicKey($pubKey)

# Verify the signature..
$rsa2 = New-Object Chilkat.Rsa
$rsa2.UsePublicKey($pubKey)

$bVerified = $rsa2.VerifyBd($bdData,"sha256",$bdSignature)
$("signature verified: " + $bVerified)