Jan2021-Cpp2Il-Dump/Assembly-CSharp/BestHTTP/SecureProtocol/Org/BouncyCastle/Crypto/Engines/ChaChaEngine.cs

using System;
using System.Runtime.InteropServices;
using BestHTTP.SecureProtocol.Org.BouncyCastle.Crypto.Utilities;
using Cpp2IlInjected;

namespace BestHTTP.SecureProtocol.Org.BouncyCastle.Crypto.Engines
{
	// Token: 0x020016AE RID: 5806
	[Token(Token = "0x20016AE")]
	[StructLayout(3)]
	public class ChaChaEngine : Salsa20Engine
	{
		// Token: 0x06009B76 RID: 39798 RVA: 0x00230DC0 File Offset: 0x0022EFC0
		[Token(Token = "0x6009B76")]
		[Address(RVA = "0x22F00D0", Offset = "0x22EEAD0", VA = "0x1822F00D0")]
		public ChaChaEngine()
		{
		}

		// Token: 0x06009B77 RID: 39799 RVA: 0x00230DD4 File Offset: 0x0022EFD4
		[Token(Token = "0x6009B77")]
		[Address(RVA = "0x22F0070", Offset = "0x22EEA70", VA = "0x1822F0070")]
		public ChaChaEngine(int rounds)
			: base(rounds)
		{
		}

		// Token: 0x170018C4 RID: 6340
		// (get) Token: 0x06009B78 RID: 39800 RVA: 0x00230DE8 File Offset: 0x0022EFE8
		[Token(Token = "0x170018C4")]
		public override string AlgorithmName
		{
			[Token(Token = "0x6009B78")]
			[Address(RVA = "0x22F0130", Offset = "0x22EEB30", VA = "0x1822F0130", Slot = "11")]
			get
			{
				int rounds = this.rounds;
				return "ChaCha" + rounds;
			}
		}

		// Token: 0x06009B79 RID: 39801 RVA: 0x00230E08 File Offset: 0x0022F008
		[Token(Token = "0x6009B79")]
		[Address(RVA = "0x22EF510", Offset = "0x22EDF10", VA = "0x1822EF510", Slot = "13")]
		protected override void AdvanceCounter()
		{
			if (this.engineState.Length == 12)
			{
				uint[] engineState = this.engineState;
			}
		}

		// Token: 0x06009B7A RID: 39802 RVA: 0x00230E34 File Offset: 0x0022F034
		[Token(Token = "0x6009B7A")]
		[Address(RVA = "0x22EFEE0", Offset = "0x22EE8E0", VA = "0x1822EFEE0", Slot = "16")]
		protected override void ResetCounter()
		{
			uint[] engineState = this.engineState;
			int num = 0;
			engineState[6] = (uint)num;
			engineState[6] = (uint)num;
		}

		// Token: 0x06009B7B RID: 39803 RVA: 0x00230E60 File Offset: 0x0022F060
		[Token(Token = "0x6009B7B")]
		[Address(RVA = "0x22EFF40", Offset = "0x22EE940", VA = "0x1822EFF40", Slot = "17")]
		protected override void SetKey(byte[] keyBytes, byte[] ivBytes)
		{
			if (keyBytes != 0)
			{
				int length = keyBytes.Length;
				uint[] engineState = this.engineState;
				int num = 0;
				base.PackTauOrSigma(length, engineState, num);
				uint[] engineState2 = this.engineState;
				int num2 = 0;
				ulong num3;
				Pack.LE_To_UInt32(keyBytes, num2, engineState2, 4, (int)num3);
				int length2 = keyBytes.Length;
				uint[] engineState3 = this.engineState;
				ulong num4;
				Pack.LE_To_UInt32(keyBytes, length2, engineState3, 8, (int)num4);
			}
			uint[] engineState4 = this.engineState;
			int num5 = 0;
			uint num6;
			ulong num7;
			Pack.LE_To_UInt32(ivBytes, num5, engineState4, (int)num6, (int)num7);
		}

		// Token: 0x06009B7C RID: 39804 RVA: 0x00230EE4 File Offset: 0x0022F0E4
		[Token(Token = "0x6009B7C")]
		[Address(RVA = "0x22EF2C0", Offset = "0x22EDCC0", VA = "0x1822EF2C0", Slot = "18")]
		protected override void GenerateKeyStream(byte[] output)
		{
			uint[] x = this.x;
			uint[] engineState = this.engineState;
			ChaChaEngine.ChachaCore(this.rounds, engineState, x);
			uint[] x2 = this.x;
			int num = 0;
			Pack.UInt32_To_LE(x2, output, num);
		}

		// Token: 0x06009B7D RID: 39805 RVA: 0x00230F20 File Offset: 0x0022F120
		[Token(Token = "0x6009B7D")]
		[Address(RVA = "0x22EF570", Offset = "0x22EDF70", VA = "0x1822EF570")]
		internal static void ChachaCore(int rounds, uint[] input, uint[] x)
		{
			while (input.Length != 16 || rounds != 1)
			{
			}
			uint num = input[2];
			uint num2 = input[6];
			uint num3 = input[5];
			uint num4 = input[6];
			uint num5 = input[0];
			uint num6 = input[0];
			uint num7 = input[2];
			uint num8 = input[4];
			uint num9 = input[3];
			uint num10 = input[4];
			uint num11 = input[3];
			uint num12 = input[7];
			uint num13 = input[1];
			uint num14 = input[5];
			uint num15 = input[7];
			uint num16 = input[1];
			if (rounds > 0)
			{
				int num17 = rounds - 1;
				num17++;
				num5 += num7;
				num10 += num5;
				num5 += num5;
				num10 += num5;
				num4 = num10;
				num8 = num5;
				num8 += num5;
				num6 += num5;
				num8 = num5;
				num10 = num5;
				num8 += num10;
				num6 = num8;
				num5 = num8;
				num14 += num5;
				num13 += num14;
				num14 += num14;
				num12 = num14;
				num13 = num14;
				num5 = num14;
				num3 += num5;
				num16 += num3;
				num5 = num3;
				num3 += num5;
				num5 += num6;
				num16 = num3;
				num5 = num3;
				num14 += num5;
				num5 += num14;
				num15 = num14;
				num14 += num15;
				num6 += num13;
				num3 += num14;
				num6 += num14;
				num3 += num14;
				num13 += num16;
				num10 += num14;
				num13 += num14;
				num10 += num14;
				num15 = num10;
				num8 += num14;
				num5 = num14;
				num14 = num8;
				num16 += num14;
				num14 = num5;
				num5 = num14;
				num8 += num14;
				num14 = num8;
				num7 = num14;
			}
			uint num18 = input[0];
			num5 += num18;
			uint num19 = input[0];
			num19 += num6;
			uint num20 = input[1];
			num20 += num13;
			uint num21 = input[1];
			num21 += num16;
			uint num22 = input[2];
			num22 += num7;
			uint num23 = input[4];
			num23 += num10;
			uint num24 = input[4];
			num24 += num8;
			uint num25 = input[5];
			num25 += num14;
			uint num26 = input[5];
			num26 += num3;
			uint num27 = input[6];
			num27 += num4;
			uint num28 = input[7];
			num28 += num12;
			uint num29 = input[7];
			num29 += num15;
		}
	}
}