DoDecryption

DoDecryption.cs

private void DoDecryption(string src, string dest)
{  
	//iv = Base64.Decode(ivString , Base64Flags.NoWrap);
	if (iv != null && iv.Length > 0)
	{ 
		var secretKey = GetKeyFromKeyStore();
		Cipher cipher = Cipher.GetInstance("AES/GCM/NoPadding");
		Javax.Crypto.Spec.GCMParameterSpec spec = new Javax.Crypto.Spec.GCMParameterSpec(128, iv);
		cipher.Init(Javax.Crypto.CipherMode.DecryptMode, secretKey, spec);

		var bytes = System.IO.File.ReadAllBytes(src);
		byte[] decodedData = cipher.DoFinal(bytes);  
		System.IO.File.WriteAllBytes(dest, decodedData);

		if (System.IO.File.Exists(dest))
		{
			System.IO.File.Delete(src); 
		}
	} 
}