public byte[] DecryptData(EncryptedPacket encryptedPacket, RSAWithRSAParameterKey rsaParams)
{
// Decrypt AES Key with RSA
var decryptedSessionKey = rsaParams.DecryptData(encryptedPacket.EncryptedSessionKey);
// Decrypt our data with AES using the decryptedSessionKey
return(_aes.Decrypt(encryptedPacket.EncryptedData, decryptedSessionKey, encryptedPacket.IV));
}
public byte[] DecryptData(EncryptedPacket encryptedPacket, RSAWithRSAParameterKey privateKey)
{
// Decrypt the unique 256 bits AES session key
var sessionKey = privateKey.DecryptData(encryptedPacket.EncryptedSessionKey);
// Validate the encrypted data is accurate
using (var hmac = new HMACSHA256(sessionKey))
{
var hmacToCheck = hmac.ComputeHash(encryptedPacket.EncryptedData);
if (!CompareBytes(encryptedPacket.Hmac, hmacToCheck))
{
throw new CryptographicException("HMAC invalid, data is corrupted.");
}
}
// Decrypt the data
var data = _aes.Decrypt(encryptedPacket.EncryptedData, sessionKey, encryptedPacket.Iv);
return(data);
}