private static byte[] Encrypt(byte[] key, byte[] plaintext)
{
var encryptor = new AesManaged()
{
Mode = CipherMode.ECB,
Key = key,
Padding = PaddingMode.None,
}.CreateEncryptor();
return(encryptor.TransformFinalBlock(plaintext, 0, plaintext.Length));
}
public static string AesDecryptor(string str)
{
byte[] array = Convert.FromBase64String(str);
ICryptoTransform cryptoTransform = new AesManaged
{
Key = Encoding.UTF8.GetBytes(GetMD5(string_0)),
IV = Encoding.UTF8.GetBytes(GetMD5(string_0).Substring(8, 16)),
Mode = CipherMode.CBC,
Padding = PaddingMode.PKCS7
}.CreateDecryptor();
return(Encoding.UTF8.GetString(cryptoTransform.TransformFinalBlock(array, 0, array.Length)));
}
/// <summary>
/// Decrypts a given byte[] using AES128 in CounterMode
/// </summary>
/// <param name="message">the encrypted message</param>
/// <param name="key">the key (32 bytes recommended)</param>
/// <param name="iv">the iv (16 bytes)</param>
/// <returns>returns the decrypted result as byte[]</returns>
public static byte[] Decrypt(byte[] message, byte[] key, byte[] iv)
{
if (iv.Length != 16)
{
throw new ArgumentException(nameof(iv));
}
if (key.Length % 16 != 0)
{
throw new ArgumentException(nameof(key));
}
ICryptoTransform transform = new AesManaged()
{
Mode = CipherMode.CBC
}.CreateDecryptor(key, iv);
return(transform.TransformFinalBlock(message, 0, message.Length));
}
public static string DecryptAes(string encrypted, byte[] aesKey)
{
var decoded = Convert.FromBase64String(encrypted);
var iv = new byte[IVLength];
Buffer.BlockCopy(decoded, 0, iv, 0, iv.Length);
var encryptedData = new byte[decoded.Length - iv.Length];
Buffer.BlockCopy(decoded, iv.Length, encryptedData, 0, encryptedData.Length);
var decryptor = new AesManaged {
KeySize = 256, BlockSize = 128
}.CreateDecryptor(aesKey, iv);
var decryptedBytes = decryptor.TransformFinalBlock(encryptedData, 0, encryptedData.Length);
return(new UTF8Encoding().GetString(decryptedBytes, 0, decryptedBytes.Length));
}
