Encrypter / Decrypter

aes-encryption.ps1

## A PowerShell conversion of the C# code in the article, https://www.c-sharpcorner.com/article/aes-encryption-in-c-sharp/ ##

using namespace System.IO
using namespace System.Security.Cryptography

class ManageAes {
    static [void] Main() {
        [string] $data = Read-Host -Prompt "Enter text that needs to be encrypted"
        [ManageAes]::EncryptAesManaged($data)
    }

    static [void] EncryptAesManaged([string] $raw) {
        try {
            $aes = [AesManaged]::new()
            [byte[]] $encrypt = [ManageAes]::Encrypt($raw, $aes.Key, $aes.IV)

            # encrypted output
            $encrypted = [System.Text.Encoding]::UTF8.GetString($encrypt)
            [Console]::WriteLine("Encrypted data: $encrypted")

            # decrypted output
            [string] $decrypted = [ManageAes]::Decrypt($encrypt, $aes.Key, $aes.IV)
            [Console]::WriteLine("Decrypted data: $decrypted")

        } catch [Exception] {
            [Console]::WriteLine($_.Exception.Message)
        }
    }

    static [Byte[]] Encrypt([string] $plainText, [byte[]] $Key, [byte[]] $IV) {
        $aes = [AesManaged]::new()
        $encryptor = $aes.CreateEncryptor($key, $IV)

        $encrypt = [MemoryStream]::new()
        $cs = [CryptoStream]::new($encrypt, $encryptor, 'Write')

        $writer = [StreamWriter]::new($cs)
        $writer.Write($PlainText)
        $writer.Close()

        [byte[]] $encrypted = $encrypt.ToArray()

        return $encrypted
    }

    static [string] Decrypt([byte[]] $encrypted, [byte[]] $Key, [byte[]] $IV) {
        $aes = [AesManaged]::new()
        $decrypt = [MemoryStream]::new($encrypted)

        $decryptor = $aes.CreateDecryptor($key, $IV)

        $cs = [CryptoStream]::new($decrypt, $decryptor, 'Read')

        $reader = [StreamReader]::new($cs)
        return $reader.ReadToEnd()
    }
}