context: using System;
  using System.Text;
  
  using NUnit.Framework;
  
  using Org.BouncyCastle.Crypto;
  using Org.BouncyCastle.Crypto.Engines;
  using Org.BouncyCastle.Crypto.Modes;
  using Org.BouncyCastle.Crypto.Parameters;
  using Org.BouncyCastle.Security;
  using Org.BouncyCastle.Utilities.Encoders;
  using Org.BouncyCastle.Utilities.Test;
  
  namespace Org.BouncyCastle.Crypto.Tests
  {
  	[TestFixture]
  	public class EaxTest
  		: SimpleTest
  	{
  		private static readonly byte[] K1 = Hex.Decode("233952DEE4D5ED5F9B9C6D6FF80FF478");
  		private static readonly byte[] N1 = Hex.Decode("62EC67F9C3A4A407FCB2A8C49031A8B3");
  		private static readonly byte[] A1 = Hex.Decode("6BFB914FD07EAE6B");
  		private static readonly byte[] P1 = Hex.Decode("");
  		private static readonly byte[] C1 = Hex.Decode("E037830E8389F27B025A2D6527E79D01");
  		private static readonly byte[] T1 = Hex.Decode("E037830E8389F27B025A2D6527E79D01");
  
  		private static readonly byte[] K2 = Hex.Decode("91945D3F4DCBEE0BF45EF52255F095A4");
  		private static readonly byte[] N2 = Hex.Decode("BECAF043B0A23D843194BA972C66DEBD");
  		private static readonly byte[] A2 = Hex.Decode("FA3BFD4806EB53FA");
  		private static readonly byte[] P2 = Hex.Decode("F7FB");
  		private static readonly byte[] C2 = Hex.Decode("19DD5C4C9331049D0BDAB0277408F67967E5");
  		private static readonly byte[] T2 = Hex.Decode("5C4C9331049D0BDAB0277408F67967E5");
  
  		private static readonly byte[] K3 = Hex.Decode("01F74AD64077F2E704C0F60ADA3DD523");
  		private static readonly byte[] N3 = Hex.Decode("70C3DB4F0D26368400A10ED05D2BFF5E");
  		private static readonly byte[] A3 = Hex.Decode("234A3463C1264AC6");
  		private static readonly byte[] P3 = Hex.Decode("1A47CB4933");
  		private static readonly byte[] C3 = Hex.Decode("D851D5BAE03A59F238A23E39199DC9266626C40F80");
  		private static readonly byte[] T3 = Hex.Decode("3A59F238A23E39199DC9266626C40F80");
  
  		private static readonly byte[] K4 = Hex.Decode("D07CF6CBB7F313BDDE66B727AFD3C5E8");
  		private static readonly byte[] N4 = Hex.Decode("8408DFFF3C1A2B1292DC199E46B7D617");
  		private static readonly byte[] A4 = Hex.Decode("33CCE2EABFF5A79D");
  		private static readonly byte[] P4 = Hex.Decode("481C9E39B1");
  		private static readonly byte[] C4 = Hex.Decode("632A9D131AD4C168A4225D8E1FF755939974A7BEDE");
  		private static readonly byte[] T4 = Hex.Decode("D4C168A4225D8E1FF755939974A7BEDE");
  
  		private static readonly byte[] K5 = Hex.Decode("35B6D0580005BBC12B0587124557D2C2");
  		private static readonly byte[] N5 = Hex.Decode("FDB6B06676EEDC5C61D74276E1F8E816");
  		private static readonly byte[] A5 = Hex.Decode("AEB96EAEBE2970E9");
  		private static readonly byte[] P5 = Hex.Decode("40D0C07DA5E4");
  		private static readonly byte[] C5 = Hex.Decode("071DFE16C675CB0677E536F73AFE6A14B74EE49844DD");
  		private static readonly byte[] T5 = Hex.Decode("CB0677E536F73AFE6A14B74EE49844DD");
  
  		private static readonly byte[] K6 = Hex.Decode("BD8E6E11475E60B268784C38C62FEB22");
  		private static readonly byte[] N6 = Hex.Decode("6EAC5C93072D8E8513F750935E46DA1B");
  		private static readonly byte[] A6 = Hex.Decode("D4482D1CA78DCE0F");
  		private static readonly byte[] P6 = Hex.Decode("4DE3B35C3FC039245BD1FB7D");
  		private static readonly byte[] C6 = Hex.Decode("835BB4F15D743E350E728414ABB8644FD6CCB86947C5E10590210A4F");
  		private static readonly byte[] T6 = Hex.Decode("ABB8644FD6CCB86947C5E10590210A4F");
  
  		private static readonly byte[] K7 = Hex.Decode("7C77D6E813BED5AC98BAA417477A2E7D");
  		private static readonly byte[] N7 = Hex.Decode("1A8C98DCD73D38393B2BF1569DEEFC19");
  		private static readonly byte[] A7 = Hex.Decode("65D2017990D62528");
  		private static readonly byte[] P7 = Hex.Decode("8B0A79306C9CE7ED99DAE4F87F8DD61636");
  		private static readonly byte[] C7 = Hex.Decode("02083E3979DA014812F59F11D52630DA30137327D10649B0AA6E1C181DB617D7F2");
  		private static readonly byte[] T7 = Hex.Decode("137327D10649B0AA6E1C181DB617D7F2");
  
  		private static readonly byte[] K8 = Hex.Decode("5FFF20CAFAB119CA2FC73549E20F5B0D");
  		private static readonly byte[] N8 = Hex.Decode("DDE59B97D722156D4D9AFF2BC7559826");
  		private static readonly byte[] A8 = Hex.Decode("54B9F04E6A09189A");
  		private static readonly byte[] P8 = Hex.Decode("1BDA122BCE8A8DBAF1877D962B8592DD2D56");
  		private static readonly byte[] C8 = Hex.Decode("2EC47B2C4954A489AFC7BA4897EDCDAE8CC33B60450599BD02C96382902AEF7F832A");
  		private static readonly byte[] T8 = Hex.Decode("3B60450599BD02C96382902AEF7F832A");
  
  		private static readonly byte[] K9 = Hex.Decode("A4A4782BCFFD3EC5E7EF6D8C34A56123");
  		private static readonly byte[] N9 = Hex.Decode("B781FCF2F75FA5A8DE97A9CA48E522EC");
  		private static readonly byte[] A9 = Hex.Decode("899A175897561D7E");
  		private static readonly byte[] P9 = Hex.Decode("6CF36720872B8513F6EAB1A8A44438D5EF11");
  		private static readonly byte[] C9 = Hex.Decode("0DE18FD0FDD91E7AF19F1D8EE8733938B1E8E7F6D2231618102FDB7FE55FF1991700");
  		private static readonly byte[] T9 = Hex.Decode("E7F6D2231618102FDB7FE55FF1991700");
  
  		private static readonly byte[] K10 = Hex.Decode("8395FCF1E95BEBD697BD010BC766AAC3");
  		private static readonly byte[] N10 = Hex.Decode("22E7ADD93CFC6393C57EC0B3C17D6B44");
  		private static readonly byte[] A10 = Hex.Decode("126735FCC320D25A");
  		private static readonly byte[] P10 = Hex.Decode("CA40D7446E545FFAED3BD12A740A659FFBBB3CEAB7");
  		private static readonly byte[] C10 = Hex.Decode("CB8920F87A6C75CFF39627B56E3ED197C552D295A7CFC46AFC253B4652B1AF3795B124AB6E");
  		private static readonly byte[] T10 = Hex.Decode("CFC46AFC253B4652B1AF3795B124AB6E");
  
  		private static readonly byte[] K11 = Hex.Decode("8395FCF1E95BEBD697BD010BC766AAC3");
  		private static readonly byte[] N11 = Hex.Decode("22E7ADD93CFC6393C57EC0B3C17D6B44");
  		private static readonly byte[] A11 = Hex.Decode("126735FCC320D25A");
  		private static readonly byte[] P11 = Hex.Decode("CA40D7446E545FFAED3BD12A740A659FFBBB3CEAB7");
  		private static readonly byte[] C11 = Hex.Decode("CB8920F87A6C75CFF39627B56E3ED197C552D295A7CFC46AFC");
  		private static readonly byte[] T11 = Hex.Decode("CFC46AFC");
  
  		private const int NONCE_LEN = 8;
  		private const int MAC_LEN = 8;
  		private const int AUTHEN_LEN = 20;
  
  		public override string Name
  		{
  			get { return "EAX"; }
  		}
  
  		public override void PerformTest()
  		{
  			checkVectors(1, K1, 128, N1, A1, P1, T1, C1);
  			checkVectors(2, K2, 128, N2, A2, P2, T2, C2);
  			checkVectors(3, K3, 128, N3, A3, P3, T3, C3);
  			checkVectors(4, K4, 128, N4, A4, P4, T4, C4);
  			checkVectors(5, K5, 128, N5, A5, P5, T5, C5);
  			checkVectors(6, K6, 128, N6, A6, P6, T6, C6);
  			checkVectors(7, K7, 128, N7, A7, P7, T7, C7);
  			checkVectors(8, K8, 128, N8, A8, P8, T8, C8);
  			checkVectors(9, K9, 128, N9, A9, P9, T9, C9);
  			checkVectors(10, K10, 128, N10, A10, P10, T10, C10);
  			checkVectors(11, K11, 32, N11, A11, P11, T11, C11);
  
  			EaxBlockCipher eax = new EaxBlockCipher(new AesEngine());
  			ivParamTest(1, eax, K1, N1);
  
  			//
  			// exception tests
  			//
  
  			try
  			{
  				eax.Init(false, new AeadParameters(new KeyParameter(K1), 32, N2, A2));
  
  				byte[] enc = new byte[C2.Length]; 
  				int len = eax.ProcessBytes(C2, 0, C2.Length, enc, 0);
  
  				len += eax.DoFinal(enc, len);
  
  				Fail("invalid cipher text not picked up");
  			}
  			catch (InvalidCipherTextException)
  			{
  				// expected
  			}
  
  			try
  			{
  				eax.Init(false, new KeyParameter(K1));
  
  				Fail("illegal argument not picked up");
  			}
  			catch (ArgumentException)
  			{
  				// expected
  			}
  
  			randomTests();
  		}
  
  		private void checkVectors(
  			int				count,
  			byte[]			k,
  			int				macSize,
  			byte[]			n,
  			byte[]			a,
  			byte[]			p,
  			byte[]			t,
  			byte[]			c)
          {
              byte[] fa = new byte[a.Length / 2];
              byte[] la = new byte[a.Length - (a.Length / 2)];
              Array.Copy(a, 0, fa, 0, fa.Length);
              Array.Copy(a, fa.Length, la, 0, la.Length);
  
              checkVectors(count, "all initial associated data", k, macSize, n, a, null, p, t, c);
              checkVectors(count, "subsequent associated data", k, macSize, n, null, a, p, t, c);
              checkVectors(count, "split associated data", k, macSize, n, fa, la, p, t, c);
          }
  
          private void checkVectors(
              int count,
              string additionalDataType,
              byte[] k,
              int macSize,
              byte[] n,
              byte[] a,
              byte[] sa,
              byte[] p,
              byte[] t,
              byte[] c)
          {
  			EaxBlockCipher encEax = new EaxBlockCipher(new AesEngine());
  			EaxBlockCipher decEax = new EaxBlockCipher(new AesEngine());
  
  			AeadParameters parameters = new AeadParameters(new KeyParameter(k), macSize, n, a);
  			encEax.Init(true, parameters);
  			decEax.Init(false, parameters);
  
              runCheckVectors(count, encEax, decEax, additionalDataType, sa, p, t, c);
              runCheckVectors(count, encEax, decEax, additionalDataType, sa, p, t, c);
  
              // key reuse test
              parameters = new AeadParameters(null, macSize, n, a);
              encEax.Init(true, parameters);
              decEax.Init(false, parameters);
  
              runCheckVectors(count, encEax, decEax, additionalDataType, sa, p, t, c);
              runCheckVectors(count, encEax, decEax, additionalDataType, sa, p, t, c);
          }
  
  		private void runCheckVectors(
  			int				count,
  			EaxBlockCipher	encEax,
  			EaxBlockCipher	decEax,
              string          additionalDataType,
              byte[]          sa,
              byte[]          p,
  			byte[]			t,
  			byte[]			c)
  		{
  			byte[] enc = new byte[c.Length];
  
              if (sa != null)
              {
                  encEax.ProcessAadBytes(sa, 0, sa.Length);
              }
  
  			int len = encEax.ProcessBytes(p, 0, p.Length, enc, 0);
  
  			len += encEax.DoFinal(enc, len);
  
  			if (!AreEqual(c, enc))
  			{
                  Fail("encrypted stream fails to match in test " + count + " with " + additionalDataType);
              }
  
  			byte[] tmp = new byte[enc.Length];
  
              if (sa != null)
              {
                  decEax.ProcessAadBytes(sa, 0, sa.Length);
              }
  
              len = decEax.ProcessBytes(enc, 0, enc.Length, tmp, 0);
  
  			len += decEax.DoFinal(tmp, len);
  
  			byte[] dec = new byte[len];
  
  			Array.Copy(tmp, 0, dec, 0, len);
  
  			if (!AreEqual(p, dec))
  			{
                  Fail("decrypted stream fails to match in test " + count + " with " + additionalDataType);
              }
  
  			if (!AreEqual(t, decEax.GetMac()))
  			{
                  Fail("MAC fails to match in test " + count + " with " + additionalDataType);
              }
  		}
  
          private void ivParamTest(
  			int					count,
  			IAeadBlockCipher	eax,
  			byte[]				k,
  			byte[]				n)
  		{
  			byte[] p = Encoding.ASCII.GetBytes("hello world!!");
  
  			eax.Init(true, new ParametersWithIV(new KeyParameter(k), n));
  
  			byte[] enc = new byte[p.Length + 8];
  
  			int len = eax.ProcessBytes(p, 0, p.Length, enc, 0);
  
  			len += eax.DoFinal(enc, len);
  
  			eax.Init(false, new ParametersWithIV(new KeyParameter(k), n));
  
  			byte[] tmp = new byte[enc.Length];
  
  			len = eax.ProcessBytes(enc, 0, enc.Length, tmp, 0);
  
  			len += eax.DoFinal(tmp, len);
  
  			byte[] dec = new byte[len];
  
  			Array.Copy(tmp, 0, dec, 0, len);
  
  			if (!AreEqual(p, dec))
  			{
  				Fail("decrypted stream fails to match in test " + count);
  			}
  		}
  
  		private void randomTests()
  		{
  			SecureRandom srng = new SecureRandom();
  			for (int i = 0; i < 10; ++i)
  			{
  				randomTest(srng);
  			}
  		}
  
  		private void randomTest(
  			SecureRandom srng)
  		{
  			int DAT_LEN = srng.Next(1024);
  
gt: 			byte[] nonce = new byte[NONCE_LEN];