public string Decrypt(string xmlkeystring, Algorithms typo, string datatodecrypt)
{
RSA rsaer = RSACry.ReadKeyString(xmlkeystring);
byte[] result = RSACry.DecryptIt(rsaer, typo, datatodecrypt);
return(System.Text.Encoding.UTF8.GetString(result));
}
public string Encrypt(string xmlkeystring, Algorithms typo, string datatoencrypt)
{
RSA rsaer = RSACry.ReadKeyString(xmlkeystring);
byte[] result = RSACry.EncryptIt(rsaer, typo, datatoencrypt);
return(System.Convert.ToBase64String(result));
}
public static byte[] DecryptIt(RSA rsaer, Algorithms typo, string datatodecrypt)
{
byte[] result = null;
try
{
byte[] encrbytes = System.Convert.FromBase64String(datatodecrypt);
SymmetricAlgorithm sa = SymmetricAlgorithm.Create(RSACry.GetAlgorithmName(typo));
byte[] keyex = new byte[(rsaer.KeySize >> 3) - 1];
Buffer.BlockCopy(encrbytes, 0, keyex, 0, keyex.Length);
RSAPKCS1KeyExchangeDeformatter def = new RSAPKCS1KeyExchangeDeformatter(rsaer);
byte[] key = def.DecryptKeyExchange(keyex);
byte[] iv = new byte[sa.IV.Length - 1];
Buffer.BlockCopy(encrbytes, keyex.Length, iv, 0, iv.Length);
ICryptoTransform ct = sa.CreateDecryptor(key, iv);
result = ct.TransformFinalBlock(encrbytes, keyex.Length + iv.Length, (encrbytes.Length - 1) - (keyex.Length + iv.Length));
}
catch (Exception ex)
{
throw new CryptographicException("Unable to decrypt: " + ex.Message);
}
return(result);
}
public static byte[] EncryptIt(RSA rsaer, Algorithms typo, string datatoencrypt)
{
byte[] result = null;
try
{
byte[] plainbytes = System.Text.Encoding.UTF8.GetBytes(datatoencrypt);
SymmetricAlgorithm sa = SymmetricAlgorithm.Create(RSACry.GetAlgorithmName(typo));
ICryptoTransform ct = sa.CreateEncryptor();
byte[] encrypt = ct.TransformFinalBlock(plainbytes, 0, plainbytes.Length);
RSAPKCS1KeyExchangeFormatter fmt = new RSAPKCS1KeyExchangeFormatter(rsaer);
byte[] keyex = fmt.CreateKeyExchange(sa.Key);
//--return the key exchange, the IV (public) and encrypted data
result = new byte[keyex.Length + sa.IV.Length + encrypt.Length];
Buffer.BlockCopy(keyex, 0, result, 0, keyex.Length);
Buffer.BlockCopy(sa.IV, 0, result, keyex.Length, sa.IV.Length);
Buffer.BlockCopy(encrypt, 0, result, keyex.Length + sa.IV.Length, encrypt.Length);
}
catch (Exception ex)
{
throw new CryptographicException("Unable to crypt: " + ex.Message);
}
return(result);
}
