PowerShell

RSA Encrypt with SHA-256 hash function and SHA-256 mask function

See more RSA Examples

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.

PowerShell

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.

$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 -eq $false) {
    $($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.
$crypt = New-Object Chilkat.Crypt2
$crypt.HashAlgorithm = "SHA-256"

$hashBytes = $crypt.HashString($originalData)

# Now to RSA encrypt using OAEP padding with SHA-256 for the mask function.
$rsa = New-Object Chilkat.Rsa
$rsa.PkcsPadding = $false
$rsa.OaepHash = "SHA256"
$rsa.UsePublicKey($pubkey)
$rsa.EncodingMode = "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 = $rsa.EncryptBytesENC($hashBytes,$bUsePrivateKey)
if ($rsa.LastMethodSuccess -eq $false) {
    $($rsa.LastErrorText)
    exit
}

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