(PowerShell) RSA Encrypt Hash using SHA256 hash function and SHA1 mask function

Note: This example requires a feature introduced in Chilkat v9.5.0.66

How can this Javascript be duplicated using Chilkat?

function a(e, t) {
                var r = s.pki.publicKeyFromPem(e)
                  , n = r.encrypt(t, "RSA-OAEP", {
                    md: s.md.sha256.create(),
                    mgf1: {
                        md: s.md.sha1.create()
                    }
                });
                return s.util.encode64(n)
            }

Note: The OAEP padding uses random bytes in the padding, and therefore each time encryption happens, even using the same data and key, the result will be different -- but still valid. One should not expect to get the same output.

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

# Note: This example requires a feature introduced in Chilkat v9.5.0.66

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

$pubkey = New-Object Chilkat.PublicKey

$sbPem = New-Object Chilkat.StringBuilder
$bCrlf = $true
$sbPem.AppendLine("-----BEGIN PUBLIC KEY-----",$bCrlf)
$sbPem.AppendLine("MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA33TqqLR3eeUmDtHS89qF",$bCrlf)
$sbPem.AppendLine("3p4MP7Wfqt2Zjj3lZjLjjCGDvwr9cJNlNDiuKboODgUiT4ZdPWbOiMAfDcDzlOxA",$bCrlf)
$sbPem.AppendLine("04DDnEFGAf+kDQiNSe2ZtqC7bnIc8+KSG/qOGQIVaay4Ucr6ovDkykO5Hxn7OU7s",$bCrlf)
$sbPem.AppendLine("Jp9TP9H0JH8zMQA6YzijYH9LsupTerrY3U6zyihVEDXXOv08vBHk50BMFJbE9iwF",$bCrlf)
$sbPem.AppendLine("wnxCsU5+UZUZYw87Uu0n4LPFS9BT8tUIvAfnRXIEWCha3KbFWmdZQZlyrFw0buUE",$bCrlf)
$sbPem.AppendLine("f0YN3/Q0auBkdbDR/ES2PbgKTJdkjc/rEeM0TxvOUf7HuUNOhrtAVEN1D5uuxE1W",$bCrlf)
$sbPem.AppendLine("SwIDAQAB",$bCrlf)
$sbPem.AppendLine("-----END PUBLIC KEY-----",$bCrlf)

# Load the public key object from the PEM. 
$success = $pubkey.LoadFromString($sbPem.GetAsString())
if ($success -ne $true) {
    $($pubkey.LastErrorText)
    exit
}

$originalData = "This is the original data to be SHA-256 hashed and RSA encrypted."

# First we SHA-256 hash the original data to get the hash in base64 format:
$crypt = New-Object Chilkat.Crypt2
$crypt.HashAlgorithm = "SHA-256"
$crypt.EncodingMode = "base64"
$hashBase64 = $crypt.HashStringENC($originalData)

# Setup RSA to use OAEP padding with SHA-1 for the mask function.
$rsa = New-Object Chilkat.Rsa
$rsa.OaepPadding = $true
$rsa.OaepHash = "SHA1"
$rsa.ImportPublicKeyObj($pubkey)
$rsa.EncodingMode = "base64"

# Starting in v9.5.0.66, we can provide a binary encoding mode, such as "base64", "hex", "base64url", etc.
# for the Charset property.   The Charset property was previously limited to character encodings, such as
# "utf-8", "iso-8859-1", etc.  If a binary encoding is used, then the string passed in is decoded to the binary
# bytes as indicated.  (If an actual charset, such as "utf-8" is used, then the input string is converted to the
# byte representation of the charset, and then encrypted.)

# Given that a hash is composed of non-text binary bytes, we'll set the Charset property equal to "base64" 
# (because we have the base64 hash from above).
$rsa.Charset = "base64"

# Note: The OAEP padding uses random bytes in the padding, and therefore each time encryption happens,
# even using the same data and key, the result will be different --  but still valid.  One should not expect
# to get the same output.
$bUsePrivateKey = $false
$encryptedStr = $rsa.EncryptStringENC($hashBase64,$bUsePrivateKey)
if ($rsa.LastMethodSuccess -ne $true) {
    $($rsa.LastErrorText)
    exit
}

$("Base64 RSA encrypted output: " + $encryptedStr)