(PowerShell) Duplicate openssl dgst -sha256 -sign private.pem -out sha256.sig in.dat

Demonstrates how to duplicate this OpenSSL command:

openssl dgst -sha256 -sign private.pem -out sha256.sig in.dat

1. Creates a SHA256 digest of the contents of the input file
2. Signs the SHA256 digest using the private key.

Chilkat .NET Downloads Chilkat .NET Assemblies

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

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

$pkey = New-Object Chilkat.PrivateKey

# Load the private key from an PEM file:
$success = $pkey.LoadPemFile("private.pem")
if ($success -ne $true) {
    $($pkey.LastErrorText)
    exit
}

$rsa = New-Object Chilkat.Rsa

# Import the private key into the RSA component:
$success = $rsa.ImportPrivateKeyObj($pkey)
if ($success -ne $true) {
    $($rsa.LastErrorText)
    exit
}

# OpenSSL uses big-endian.
$rsa.LittleEndian = $false

# Load the file to be signed.
$bdFileData = New-Object Chilkat.BinData
$success = $bdFileData.LoadFile("in.dat")

$bdSig = New-Object Chilkat.BinData
$success = $rsa.SignBd($bdFileData,"sha256",$bdSig)
if ($success -ne $true) {
    $($rsa.LastErrorText)
    exit
}

# Save the binary signature to a file.
$success = $bdSig.WriteFile("signature.sig")
if ($success -ne $true) {
    $("Failed to write signature.sig.")
    exit
}

$("Success.")