#define TRACE
using System;
using System.Diagnostics;
using System.Globalization;
using System.IO;
using System.Security.Cryptography;
using System.Text;
using ArchestrAServices.Common;

namespace ArchestrAServices.Contract;

internal static class AuthenticationCryptography
{
	public static byte[] DeriveKey(byte[] passPhrase, byte[] saltValue, string hashAlgorithm, int passwordIterations, int keySize)
	{
		if (passPhrase == null || passPhrase.Length == 0)
		{
			throw new ArgumentNullException("passPhrase");
		}
		if (saltValue == null || saltValue.Length == 0)
		{
			throw new ArgumentNullException("saltValue");
		}
		if (string.IsNullOrEmpty(hashAlgorithm))
		{
			throw new ArgumentNullException("hashAlgorithm");
		}
		byte[] array = new byte[passPhrase.Length + saltValue.Length];
		Buffer.BlockCopy(passPhrase, 0, array, 0, passPhrase.Length);
		Buffer.BlockCopy(saltValue, 0, array, passPhrase.Length, saltValue.Length);
		using MD5 mD = new MD5CryptoServiceProvider();
		for (int i = 0; i < passwordIterations; i++)
		{
			array = mD.ComputeHash(array);
		}
		StringBuilder stringBuilder = new StringBuilder();
		for (int j = 0; j < array.Length; j++)
		{
			stringBuilder.Append(array[j].ToString("x2"));
		}
		SvcTrace.DiagDiagnostics.TraceEvent(TraceEventType.Information, 100, string.Format(CultureInfo.CurrentCulture, "SvcAuth: DeriveKey generated '{0}' from '{1}'", new object[2]
		{
			stringBuilder.ToString(),
			passPhrase[0].ToString("x2")
		}));
		return Encoding.UTF8.GetBytes(stringBuilder.ToString());
	}

	public static byte[] Encrypt(byte[] PlainPayload, byte[] passPhrase, byte[] saltValue, string hashAlgorithm, int passwordIterations, byte[] initVector, int keySize)
	{
		if (PlainPayload == null)
		{
			throw new ArgumentNullException("value");
		}
		if (passPhrase == null || passPhrase.Length == 0)
		{
			throw new ArgumentNullException("passPhrase");
		}
		if (saltValue == null || saltValue.Length == 0)
		{
			throw new ArgumentNullException("saltValue");
		}
		if (string.IsNullOrEmpty(hashAlgorithm))
		{
			throw new ArgumentNullException("hashAlgorithm");
		}
		if (initVector == null || initVector.Length == 0)
		{
			throw new ArgumentNullException("initVector");
		}
		byte[] rgbKey = DeriveKey(passPhrase, saltValue, hashAlgorithm, passwordIterations, 32);
		byte[] array = null;
		using RijndaelManaged rijndaelManaged = new RijndaelManaged();
		rijndaelManaged.Mode = CipherMode.CBC;
		ICryptoTransform transform = rijndaelManaged.CreateEncryptor(rgbKey, initVector);
		using MemoryStream memoryStream = new MemoryStream();
		using CryptoStream cryptoStream = new CryptoStream(memoryStream, transform, CryptoStreamMode.Write);
		cryptoStream.Write(PlainPayload, 0, PlainPayload.Length);
		cryptoStream.FlushFinalBlock();
		return memoryStream.ToArray();
	}

	public static byte[] Decrypt(byte[] CypherPayload, byte[] passPhrase, byte[] saltValue, string hashAlgorithm, int passwordIterations, byte[] initVector, int keySize)
	{
		if (CypherPayload == null)
		{
			throw new ArgumentNullException("value");
		}
		if (passPhrase == null || passPhrase.Length == 0)
		{
			throw new ArgumentNullException("passPhrase");
		}
		if (saltValue == null || saltValue.Length == 0)
		{
			throw new ArgumentNullException("saltValue");
		}
		if (string.IsNullOrEmpty(hashAlgorithm))
		{
			throw new ArgumentNullException("hashAlgorithm");
		}
		if (initVector == null || initVector.Length == 0)
		{
			throw new ArgumentNullException("initVector");
		}
		byte[] rgbKey = DeriveKey(passPhrase, saltValue, hashAlgorithm, passwordIterations, 32);
		byte[] array = null;
		using (RijndaelManaged rijndaelManaged = new RijndaelManaged())
		{
			rijndaelManaged.Mode = CipherMode.CBC;
			ICryptoTransform transform = rijndaelManaged.CreateDecryptor(rgbKey, initVector);
			using MemoryStream stream = new MemoryStream(CypherPayload);
			using CryptoStream cryptoStream = new CryptoStream(stream, transform, CryptoStreamMode.Read);
			array = new byte[CypherPayload.Length];
			int num = 0;
			try
			{
				num = cryptoStream.Read(array, 0, array.Length);
			}
			catch (Exception)
			{
				num = array.Length;
				for (int i = 0; i < num; i++)
				{
					array[i] = 0;
				}
			}
		}
		return array;
	}
}