MIME S/MIME Signing Algorithm Properties

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Demonstrates the properties that control S/MIME signing: SigningAlg (the RSA signature scheme, PKCS1-V1_5 or RSASSA-PSS), SigningHashAlg (the message-digest algorithm), Micalg and Protocol (the micalg and protocol parameters of a multipart/signed Content-Type), and UseXPkcs7 (whether historical x-pkcs7 media-type names are used). The properties are configured before creating a detached signature.

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

$success = $false

$mime = New-Object Chilkat.Mime
$success = $mime.SetBodyFromPlainText("This message will be signed.")
if ($success -eq $false) {
    $($mime.LastErrorText)
    exit
}

#  SigningAlg is the RSA signature scheme.  The default is PKCS1-V1_5; set RSASSA-PSS (or pss) for
#  RSASSA-PSS.
$mime.SigningAlg = "PKCS1-V1_5"

#  SigningHashAlg is the message-digest algorithm.  The default is sha256.
$mime.SigningHashAlg = "sha256"

#  Micalg and Protocol are the micalg and protocol parameters written into a multipart/signed
#  Content-Type header field.  They are normally set automatically, but can be controlled here.
$mime.Micalg = "sha-256"
$mime.Protocol = "application/pkcs7-signature"

#  UseXPkcs7 controls whether newly created S/MIME media types use the historical x-pkcs7 names.
$mime.UseXPkcs7 = $false

#  Load a signing certificate (with private key access) from a PFX.  The PFX password should come
#  from a secure source rather than being hard-coded.
$pfxPassword = "myPfxPassword"
$cert = New-Object Chilkat.Cert
$success = $cert.LoadPfxFile("qa_data/signer.pfx",$pfxPassword)
if ($success -eq $false) {
    $($cert.LastErrorText)
    exit
}

#  Create the detached signature using the algorithms configured above.
$success = $mime.AddDetachedSignature($cert)
if ($success -eq $false) {
    $($mime.LastErrorText)
    exit
}

$("Signed with SigningAlg=" + $mime.SigningAlg + " SigningHashAlg=" + $mime.SigningHashAlg)