public static string Decrypt(byte[] cipherText, string cnxnString)
{
byte[] decryptedData;
using (RSACryptoServiceProvider rsa = new RSACryptoServiceProvider())
{
RSAUtilityInfo info = ReadParams(cnxnString);
string publicKey;
string privateKey;
if (info == null) // shouldn't happen
{
publicKey = rsa.ToXmlString(includePrivateParameters: false);
privateKey = rsa.ToXmlString(includePrivateParameters: true);
WriteParams(publicKey, privateKey, cnxnString);
}
else
{
publicKey = info.PublicKey;
privateKey = info.PrivateKey;
}
rsa.FromXmlString(privateKey);
decryptedData = rsa.Decrypt(cipherText, false);
return(Encoding.UTF8.GetString(decryptedData));
}
}
public static byte[] Encrypt(string clearText, string cnxnString)
{
using (RSACryptoServiceProvider rsa = new RSACryptoServiceProvider())
{
string publicKey;
string privateKey;
RSAUtilityInfo info = ReadParams(cnxnString);
if (info == null)
{
publicKey = rsa.ToXmlString(includePrivateParameters: false);
privateKey = rsa.ToXmlString(includePrivateParameters: true);
WriteParams(publicKey, privateKey, cnxnString);
}
else
{
publicKey = info.PublicKey;
privateKey = info.PrivateKey;
}
byte[] dataToEncrypt = Encoding.UTF8.GetBytes(clearText);
using (RSACryptoServiceProvider RSA = new RSACryptoServiceProvider())
{
RSA.FromXmlString(publicKey);
return(RSA.Encrypt(dataToEncrypt, false));
}
}
}
