/// <summary>
/// Validate the hmac from a received message
/// </summary>
/// <param name="receivedHmac"></param>
/// <param name="decryptedSaleToPoiMessageByteArray"></param>
/// <param name="encryptionDerivedKey"></param>
private void ValidateHmac(byte[] receivedHmac, byte[] decryptedSaleToPoiMessageByteArray, EncryptionDerivedKey encryptionDerivedKey)
{
var hmacSha256Wrapper = new HmacSha256Wrapper();
byte[] hmac = hmacSha256Wrapper.HMac(decryptedSaleToPoiMessageByteArray, encryptionDerivedKey.HmacKey);
bool isValid = true;
if (receivedHmac.Length == hmac.Length)
{
for (int i = 0; i < hmac.Length; i++)
{
if (receivedHmac[i] != hmac[i])
{
isValid = false;
}
}
}
else
{
isValid = false;
}
if (!isValid)
{
throw new NexoCryptoException("Hmac validation failed");
}
}
public SaleToPoiMessageSecuredEncryptor()
{
_encryptionDerivedKeyGenerator = new EncryptionDerivedKeyGenerator();
_aesEncryptor = new AesEncryptor();
_hmacSha256Wrapper = new HmacSha256Wrapper();
_ivModGenerator = new IvModGenerator();
}
