public async Task <string> DecryptAsync(CryptoKeySet cryptoKeySet, string valueToDecrypt)
{
string plaintext = null;
using (AesManaged algorithm = new AesManaged())
{
algorithm.Key = Convert.FromBase64String(cryptoKeySet.Key);
algorithm.IV = Convert.FromBase64String(cryptoKeySet.IV);
byte[] cipher = Convert.FromBase64String(valueToDecrypt);
ICryptoTransform decryptor = algorithm.CreateDecryptor(algorithm.Key, algorithm.IV);
using (MemoryStream stream = new MemoryStream(cipher))
{
using (CryptoStream cryptoStream = new CryptoStream(stream, decryptor, CryptoStreamMode.Read))
{
using (StreamReader streamReader = new StreamReader(cryptoStream))
{
plaintext = await streamReader.ReadToEndAsync();
}
}
}
}
return(plaintext);
}
public async Task <string> EncryptAsync(CryptoKeySet cryptoKeySet, string valueToEncrypt)
{
byte[] encrypted;
using (AesManaged algorithm = new AesManaged())
{
algorithm.Key = Convert.FromBase64String(cryptoKeySet.Key);
algorithm.IV = Convert.FromBase64String(cryptoKeySet.IV);
ICryptoTransform encryptor = algorithm.CreateEncryptor(algorithm.Key, algorithm.IV);
using (MemoryStream stream = new MemoryStream())
{
using (CryptoStream cryptoStream = new CryptoStream(stream, encryptor, CryptoStreamMode.Write))
{
using (StreamWriter streamWriter = new StreamWriter(cryptoStream))
{
await streamWriter.WriteAsync(valueToEncrypt);
}
encrypted = stream.ToArray();
}
}
}
return(Convert.ToBase64String(encrypted));
}
public CryptoKeySet GenerateCryptoKeySet()
{
CryptoKeySet cryptoKeySet = new CryptoKeySet();
using (AesManaged algorithm = new AesManaged())
{
algorithm.GenerateKey();
algorithm.GenerateIV();
cryptoKeySet.Key = Convert.ToBase64String(algorithm.Key);
cryptoKeySet.IV = Convert.ToBase64String(algorithm.IV);
}
return(cryptoKeySet);
}
