C# AES sample code

AES_sample_code

using System;
using System.IO;
using System.Security.Cryptography;

namespace AES
{
    class Program
    {
        static string aes_key = "AXe8YwuIn1zxt3FPWTZFlAa14EHdPAdN9FaZ9RQWihc=";
        static string aes_iv = "bsxnWolsAyO7kCfWuyrnqg==";

        static void Main(string[] args)
        {

            string original = "Here is some data to encrypt!";

            try
            {
                // Encrypt the string to an array of bytes.
                byte[] encrypted = EncryptStringToBytes(original, Convert.FromBase64String(aes_key), Convert.FromBase64String(aes_iv));

                // Decrypt the bytes to a string.
                string roundtrip = DecryptStringFromBytes(encrypted, Convert.FromBase64String(aes_key), Convert.FromBase64String(aes_iv));

                //Display the original data and the decrypted data.
                Console.WriteLine("Original:   {0}", original);
                Console.WriteLine("Round Trip: {0}", roundtrip);

                Console.WriteLine("===========================");

                // Encrypt the string to an array of bytes.
                string str_encrypted = EncryptAES(original);

                // Decrypt the bytes to a string.
                string str_roundtrip = DecryptAES(str_encrypted);

                Console.WriteLine("Original: {0}", str_encrypted);
                Console.WriteLine("Round Trip: {0}", str_roundtrip);

                Console.ReadLine();
            }
            catch (Exception e)
            {
                Console.WriteLine("Error: {0}", e.Message);
            }
        }

        public static string EncryptAES(string plainText)
        {
            byte[] encrypted;

            using (AesCryptoServiceProvider aes = new AesCryptoServiceProvider())
            {
                aes.Key = Convert.FromBase64String(aes_key);
                aes.IV = Convert.FromBase64String(aes_iv);
                aes.Mode = CipherMode.CBC;
                aes.Padding = PaddingMode.PKCS7;

                ICryptoTransform enc = aes.CreateEncryptor(aes.Key, aes.IV);

                using (MemoryStream ms = new MemoryStream())
                {
                    using (CryptoStream cs = new CryptoStream(ms, enc, CryptoStreamMode.Write))
                    {
                        using (StreamWriter sw = new StreamWriter(cs))
                        {
                            sw.Write(plainText);
                        }

                        encrypted = ms.ToArray();
                    }
                }
            }

            return Convert.ToBase64String(encrypted);
        }

        public static string DecryptAES(string encryptedText)
        {
            string decrypted = null;
            byte[] cipher = Convert.FromBase64String(encryptedText);

            using (AesCryptoServiceProvider aes = new AesCryptoServiceProvider())
            {
                aes.Key = Convert.FromBase64String(aes_key);
                aes.IV = Convert.FromBase64String(aes_iv);
                aes.Mode = CipherMode.CBC;
                aes.Padding = PaddingMode.PKCS7;

                ICryptoTransform dec = aes.CreateDecryptor(aes.Key, aes.IV);

                using (MemoryStream ms = new MemoryStream(cipher))
                {
                    using (CryptoStream cs = new CryptoStream(ms, dec, CryptoStreamMode.Read))
                    {
                        using (StreamReader sr = new StreamReader(cs))
                        {
                            decrypted = sr.ReadToEnd();
                        }
                    }
                }
            }

            return decrypted;
        }

        static byte[] EncryptStringToBytes(string plainText, byte[] Key, byte[] IV)
        {
            // Check arguments.
            if (plainText == null || plainText.Length <= 0)
                throw new ArgumentNullException("plainText");
            if (Key == null || Key.Length <= 0)
                throw new ArgumentNullException("Key");
            if (IV == null || IV.Length <= 0)
                throw new ArgumentNullException("Key");
            byte[] encrypted;
            // Create an RijndaelManaged object
            // with the specified key and IV.
            using (RijndaelManaged rijAlg = new RijndaelManaged())
            {
                rijAlg.Key = Key;
                rijAlg.IV = IV;

                // Create a decrytor to perform the stream transform.
                ICryptoTransform encryptor = rijAlg.CreateEncryptor(rijAlg.Key, rijAlg.IV);

                // Create the streams used for encryption.
                using (MemoryStream msEncrypt = new MemoryStream())
                {
                    using (CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))
                    {
                        using (StreamWriter swEncrypt = new StreamWriter(csEncrypt))
                        {

                            //Write all data to the stream.
                            swEncrypt.Write(plainText);
                        }
                        encrypted = msEncrypt.ToArray();
                    }
                }
            }


            // Return the encrypted bytes from the memory stream.
            return encrypted;

        }

        static string DecryptStringFromBytes(byte[] cipherText, byte[] Key, byte[] IV)
        {
            // Check arguments.
            if (cipherText == null || cipherText.Length <= 0)
                throw new ArgumentNullException("cipherText");
            if (Key == null || Key.Length <= 0)
                throw new ArgumentNullException("Key");
            if (IV == null || IV.Length <= 0)
                throw new ArgumentNullException("Key");

            // Declare the string used to hold
            // the decrypted text.
            string plaintext = null;

            // Create an RijndaelManaged object
            // with the specified key and IV.
            using (RijndaelManaged rijAlg = new RijndaelManaged())
            {
                rijAlg.Key = Key;
                rijAlg.IV = IV;

                // Create a decrytor to perform the stream transform.
                ICryptoTransform decryptor = rijAlg.CreateDecryptor(rijAlg.Key, rijAlg.IV);

                // Create the streams used for decryption.
                using (MemoryStream msDecrypt = new MemoryStream(cipherText))
                {
                    using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))
                    {
                        using (StreamReader srDecrypt = new StreamReader(csDecrypt))
                        {

                            // Read the decrypted bytes from the decrypting stream
                            // and place them in a string.
                            plaintext = srDecrypt.ReadToEnd();
                        }
                    }
                }

            }

            return plaintext;

        }
    }
}

function Encrypt-Data($AesKey, $Data) {
    $Data = [System.Text.Encoding]::UTF8.GetBytes($Data)
    $AesManaged = New-Object "System.Security.Cryptography.AesManaged"
    $AesManaged.Mode = [System.Security.Cryptography.CipherMode]::CBC
    $AesManaged.Padding = [System.Security.Cryptography.PaddingMode]::PKCS7
    $AesManaged.BlockSize = 128
    $AesManaged.KeySize = 256
    $AesManaged.IV = [System.Convert]::FromBase64String("1RPs2B3grDEKLjiLmfVMjw==")
    $AesManaged.Key = [System.Convert]::FromBase64String("wQpxkQNAxqULHUsAy/cuTnzyrF1LYGLkbOyozXv6Kag=")
     $Encryptor = $AesManaged.CreateEncryptor()
    $EncryptedData = $Encryptor.TransformFinalBlock($Data, 0, $Data.Length);
    [byte[]] $EncryptedData = $AesManaged.Key + $EncryptedData
    #[System.Convert]::ToBase64String($AesManaged.IV)
    $AesManaged.Dispose()
    [System.Convert]::ToBase64String($EncryptedData)
}

function Decrypt-Data($AesKey, $Data) {
    $Data = [System.Convert]::FromBase64String($Data)
    $AesManaged = New-Object "System.Security.Cryptography.AesManaged"
    $AesManaged.Mode = [System.Security.Cryptography.CipherMode]::CBC
    $AesManaged.Padding = [System.Security.Cryptography.PaddingMode]::PKCS7
    $AesManaged.BlockSize = 128
    $AesManaged.KeySize = 256
    $AesManaged.IV = [System.Convert]::FromBase64String("1RPs2B3grDEKLjiLmfVMjw==")
    $AesManaged.Key = [System.Convert]::FromBase64String($AesKey)
    $Decryptor = $AesManaged.CreateDecryptor();
    $DecryptedData = $Decryptor.TransformFinalBlock($Data, 16, $Data.Length - 16);
    $aesManaged.Dispose()
    [System.Text.Encoding]::UTF8.GetString($DecryptedData)
   #Create-AesKey 256
  $encrypted = Encrypt-Data "wQpxkQNAxqULHUsAy/cuTnzyrF1LYGLkbOyozXv6Kag=" "Hello World!"
  decrypted = Decrypt-Data "wQpxkQNAxqULHUsAy/cuTnzyrF1LYGLkbOyozXv6Kag=" "1RPs2B3grDEKLjiLmfVMjzz9A+Y/7FD+Gx57fUL9SGY="

Thanks for the nice code!
Please tell me how I can modify your C # code, similarly to the Powershell encrypted function ...?
Powershell encryption function, each time returns a different encrypted string "Hello World!".
1RPs2B3grDEKLjiLmfVMjzz9A+Y/7FD+Gx57fUL9SGY=
This is very good, because with each iteration we get completely different values ​​of the encrypted string!

Your C # code returns only the single-static value of the string "Hello World!":
Original: PP0D5j/sUP4bHnt9Qv1IZg==

with best regards!

function Encrypt-Data($AesKey, $Data) {
    $Data = [System.Text.Encoding]::UTF8.GetBytes($Data)
    $AesManaged = New-Object "System.Security.Cryptography.AesManaged"
    $AesManaged.Mode = [System.Security.Cryptography.CipherMode]::CBC
    $AesManaged.Padding = [System.Security.Cryptography.PaddingMode]::PKCS7
    $AesManaged.BlockSize = 128
    $AesManaged.KeySize = 256
    $AesManaged.IV = [System.Convert]::FromBase64String("1RPs2B3grDEKLjiLmfVMjw==")
    $AesManaged.Key = [System.Convert]::FromBase64String("wQpxkQNAxqULHUsAy/cuTnzyrF1LYGLkbOyozXv6Kag=")
     $Encryptor = $AesManaged.CreateEncryptor()
    $EncryptedData = $Encryptor.TransformFinalBlock($Data, 0, $Data.Length);
    [byte[]] $EncryptedData = $AesManaged.Key + $EncryptedData
    #[System.Convert]::ToBase64String($AesManaged.IV)
    $AesManaged.Dispose()
    [System.Convert]::ToBase64String($EncryptedData)
}

function Decrypt-Data($AesKey, $Data) {
    $Data = [System.Convert]::FromBase64String($Data)
    $AesManaged = New-Object "System.Security.Cryptography.AesManaged"
    $AesManaged.Mode = [System.Security.Cryptography.CipherMode]::CBC
    $AesManaged.Padding = [System.Security.Cryptography.PaddingMode]::PKCS7
    $AesManaged.BlockSize = 128
    $AesManaged.KeySize = 256
    $AesManaged.IV = [System.Convert]::FromBase64String("1RPs2B3grDEKLjiLmfVMjw==")
    $AesManaged.Key = [System.Convert]::FromBase64String($AesKey)
    $Decryptor = $AesManaged.CreateDecryptor();
    $DecryptedData = $Decryptor.TransformFinalBlock($Data, 16, $Data.Length - 16);
    $aesManaged.Dispose()
    [System.Text.Encoding]::UTF8.GetString($DecryptedData)
   #Create-AesKey 256
  $encrypted = Encrypt-Data "wQpxkQNAxqULHUsAy/cuTnzyrF1LYGLkbOyozXv6Kag=" "Hello World!"
  decrypted = Decrypt-Data "wQpxkQNAxqULHUsAy/cuTnzyrF1LYGLkbOyozXv6Kag=" "1RPs2B3grDEKLjiLmfVMjzz9A+Y/7FD+Gx57fUL9SGY="

Thanks for the nice code! Please tell me how I can modify your C # code, similarly to the Powershell encrypted function ...? Powershell encryption function, each time returns a different encrypted string "Hello World!". 1RPs2B3grDEKLjiLmfVMjzz9A+Y/7FD+Gx57fUL9SGY= This is very good, because with each iteration we get completely different values ​​of the encrypted string!

Your C # code returns only the single-static value of the string "Hello World!":

Original: PP0D5j/sUP4bHnt9Qv1IZg==

with best regards!

After 4 years fixed code:

function Encrypt-Data($key, $data) {
    $bytes = [System.Text.Encoding]::UTF8.GetBytes($data)
    $aes = [System.Security.Cryptography.AesManaged]::new()
    $aes.Mode = [System.Security.Cryptography.CipherMode]::CBC
    $aes.Padding = [System.Security.Cryptography.PaddingMode]::PKCS7
    $aes.BlockSize = 128
    $aes.KeySize = 256
    $aes.IV = [System.Convert]::FromBase64String("1RPs2B3grDEKLjiLmfVMjw==")
    $aes.Key = [System.Convert]::FromBase64String($key)
     $Encryptor = $aes.CreateEncryptor()
    $EncryptedData = $Encryptor.TransformFinalBlock($bytes, 0, $bytes.Length);
    [byte[]] $EncryptedData = $EncryptedData
    $aes.Dispose()
    return [System.Convert]::ToBase64String($EncryptedData)
}

function Decrypt-Data($key, $data) {
    $bytes = [System.Convert]::FromBase64String($data)
    $aes = [System.Security.Cryptography.AesManaged]::new()
    $aes.Mode = [System.Security.Cryptography.CipherMode]::CBC
    $aes.Padding = [System.Security.Cryptography.PaddingMode]::PKCS7
    $aes.BlockSize = 128
    $aes.KeySize = 256
    $aes.IV = [System.Convert]::FromBase64String("1RPs2B3grDEKLjiLmfVMjw==")
    $aes.Key = [System.Convert]::FromBase64String($key)
    $dec = $aes.CreateDecryptor();
    $value = $dec.TransformFinalBlock($bytes, 0, $bytes.Length);
    $aes.Dispose()
    return [System.Text.Encoding]::UTF8.GetString($value)
}

#Create-AesKey 256
$encrypted = Encrypt-Data "wQpxkQNAxqULHUsAy/cuTnzyrF1LYGLkbOyozXv6Kag=" "Hello World!"
$decrypted = Decrypt-Data "wQpxkQNAxqULHUsAy/cuTnzyrF1LYGLkbOyozXv6Kag=" $encrypted