Aug2021-Cpp2IL-Dump/Assembly-CSharp/BestHTTP/SecureProtocol/Org/BouncyCastle/Crypto/Engines/ChaChaEngine.cs

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

namespace BestHTTP.SecureProtocol.Org.BouncyCastle.Crypto.Engines
{
	// Token: 0x02001C8B RID: 7307
	[Token(Token = "0x2001C8B")]
	public class ChaChaEngine : Salsa20Engine
	{
		// Token: 0x0600B750 RID: 46928 RVA: 0x00288474 File Offset: 0x00286674
		[Token(Token = "0x600B750")]
		[Address(RVA = "0x1DC4B40", Offset = "0x1DC3940", VA = "0x181DC4B40")]
		public ChaChaEngine()
		{
		}

		// Token: 0x0600B751 RID: 46929 RVA: 0x00288488 File Offset: 0x00286688
		[Token(Token = "0x600B751")]
		[Address(RVA = "0x1DC4AE0", Offset = "0x1DC38E0", VA = "0x181DC4AE0")]
		public ChaChaEngine(int rounds)
			: base(rounds)
		{
		}

		// Token: 0x17001CC5 RID: 7365
		// (get) Token: 0x0600B752 RID: 46930 RVA: 0x0028849C File Offset: 0x0028669C
		[Token(Token = "0x17001CC5")]
		public override string AlgorithmName
		{
			[Token(Token = "0x600B752")]
			[Address(RVA = "0x1DC4BA0", Offset = "0x1DC39A0", VA = "0x181DC4BA0", Slot = "11")]
			get
			{
				int rounds = this.rounds;
				return "ChaCha" + rounds;
			}
		}

		// Token: 0x0600B753 RID: 46931 RVA: 0x002884BC File Offset: 0x002866BC
		[Token(Token = "0x600B753")]
		[Address(RVA = "0x1DC3F80", Offset = "0x1DC2D80", VA = "0x181DC3F80", Slot = "13")]
		protected override void AdvanceCounter()
		{
			if (this.engineState.Length == 12)
			{
				uint[] engineState = this.engineState;
			}
		}

		// Token: 0x0600B754 RID: 46932 RVA: 0x002884E8 File Offset: 0x002866E8
		[Token(Token = "0x600B754")]
		[Address(RVA = "0x1DC4950", Offset = "0x1DC3750", VA = "0x181DC4950", Slot = "16")]
		protected override void ResetCounter()
		{
			uint[] engineState = this.engineState;
			int num = 0;
			engineState[6] = (uint)num;
			engineState[6] = (uint)num;
		}

		// Token: 0x0600B755 RID: 46933 RVA: 0x00288514 File Offset: 0x00286714
		[Token(Token = "0x600B755")]
		[Address(RVA = "0x1DC49B0", Offset = "0x1DC37B0", VA = "0x181DC49B0", 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: 0x0600B756 RID: 46934 RVA: 0x00288598 File Offset: 0x00286798
		[Token(Token = "0x600B756")]
		[Address(RVA = "0x1DC3D30", Offset = "0x1DC2B30", VA = "0x181DC3D30", 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: 0x0600B757 RID: 46935 RVA: 0x002885D4 File Offset: 0x002867D4
		[Token(Token = "0x600B757")]
		[Address(RVA = "0x1DC3FE0", Offset = "0x1DC2DE0", VA = "0x181DC3FE0")]
		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;
		}
	}
}