public EncryptedPacket EncryptData(
byte[] original, RSAWithRSAParameterKey rsaParams, DigitalSignature digitalSignature)
{
const int sessionKeyLength = 32;
const int ivLength = 16;
byte[] sessionKey = _aes.GenerateRandomNumber(sessionKeyLength);
EncryptedPacket encryptedPacket = new EncryptedPacket { Iv = _aes.GenerateRandomNumber(ivLength) };
encryptedPacket.EncryptedData = _aes.Encrypt(original, sessionKey, encryptedPacket.Iv);
encryptedPacket.EncryptedSessionKey = rsaParams.EncryptData(sessionKey);
using (var hmac = new HMACSHA256(sessionKey))
{
encryptedPacket.Hmac = hmac.ComputeHash(encryptedPacket.EncryptedData);
}
encryptedPacket.Signature = digitalSignature.SignData(encryptedPacket.Hmac);
return encryptedPacket;
}
