public static string Decrypt(CryptoEncryptedPacket encryptedPacket, CryptoRSAParameters rsaParameters)
{
var decryptedSessionKey = CryptoRsa.Decrypt(encryptedPacket.EncryptedSessionKey, rsaParameters.privateKey);
var hmacToCheck = CryptoHmac.Sha256(encryptedPacket.EncryptedData, decryptedSessionKey);
if (!Compare(encryptedPacket.Hmac, hmacToCheck))
{
throw new CryptographicException("HMAC for decyrption does not match encrypted packet");
}
if (!CryptoDigitalSignature.Verify(encryptedPacket.Hmac, encryptedPacket.Signature, rsaParameters.publicKey))
{
throw new CryptographicException("Digital Signature can not be verified");
}
return(CryptoAes.Decrypt(encryptedPacket.EncryptedData, decryptedSessionKey, encryptedPacket.Iv));
}
public static string Decrypt(CryptoEncryptedPacket encryptedPacket, RSAParameters privateKey)
{
var decryptedSessionKey = CryptoRsa.Decrypt(encryptedPacket.EncryptedSessionKey, privateKey);
return(CryptoAes.Decrypt(encryptedPacket.EncryptedData, decryptedSessionKey, encryptedPacket.Iv));
}