(PowerShell) PKCS7 Sign Text using RSA 2048, SHA256, Base64 Output

Demonstrates how to sign text using 2048-bit RSA with SHA256, producing PKCS#7 output in Base64. The certificate w/ private key used for signing is loaded from a .p12/.pfx file.

Chilkat .NET Downloads Chilkat .NET Assemblies

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

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

$cert = New-Object Chilkat.Cert

# Load the cert and private key.  Whatever the private key happens to be,
# such as RSA or ECC, then Chilkat will use it.  If the private key is 
# a 2048-bit RSA key, then that's what will be used..
$success = $cert.LoadPfxFile("qa_data/pfx/myCertAndKey.p12","password")
if ($success -ne $true) {
    $($cert.LastErrorText)
    exit
}

$crypt = New-Object Chilkat.Crypt2

$success = $crypt.SetSigningCert($cert)
if ($success -ne $true) {
    $($crypt.LastErrorText)
    exit
}

# Use SHA-256
$crypt.HashAlgorithm = "sha256"

# Hash the utf-8 byte representation of the string
$crypt.Charset = "utf-8"

# Return the result in base64
$crypt.EncodingMode = "base64"

# Sign some text..
$textToSign = "This is the text to be hashed and signed."
$sigBase64 = $crypt.OpaqueSignStringENC($textToSign)
if ($crypt.LastMethodSuccess -ne $true) {
    $($crypt.LastErrorText)
    exit
}

$($sigBase64)

# The result:
# MIIS2wYJKoZIhvcNAQc ... zGeeY4Oxg==