84 lines
3.3 KiB
C#
84 lines
3.3 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Security.Cryptography;
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using System.Text;
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using System.Threading.Tasks;
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namespace OpenSaveCloudClient.Core
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{
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internal class HashTool
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{
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/// <summary>
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/// method <c>HashDirectory</c> walk through a directory and make a hash of all the files
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/// </summary>
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/// <param name="path">The path to the folder</param>
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/// <returns>The hash of the folder</returns>
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/// <exception cref="InvalidOperationException"></exception>
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public static byte[]? HashDirectory(string path)
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{
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DirectoryInfo dir = new(path);
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using HashAlgorithm? sha = HashAlgorithm.Create("SHA-512");
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if (sha == null)
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{
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throw new InvalidOperationException("HashDirectory: SHA-512 algorithm does not exist");
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}
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using (var stream = new CryptoStream(Stream.Null, sha, CryptoStreamMode.Write))
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{
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using var writer = new BinaryWriter(stream);
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FileSystemInfo[] infos = dir.GetFileSystemInfos();
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Array.Sort(infos, (a, b) => string.Compare(a.Name, b.Name, StringComparison.Ordinal));
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foreach (FileSystemInfo info in infos)
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{
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writer.Write(info.Name);
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if ((info.Attributes & FileAttributes.Directory) == 0)
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{
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byte[]? hash = HashFile(info as FileInfo);
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if (hash == null)
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{
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throw new InvalidOperationException("HashDirectory: hash of the file is null");
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}
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writer.Write((byte)'F');
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writer.Write(hash);
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}
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else
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{
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byte[]? hash = HashDirectory(info.FullName);
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if (hash == null)
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{
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throw new InvalidOperationException("HashDirectory: hash of the directory is null");
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}
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writer.Write((byte)'D');
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writer.Write(hash);
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}
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}
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}
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return sha.Hash;
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}
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/// <summary>
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/// method <c>HashFile</c> make a hash SHA-512 of a file
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/// </summary>
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/// <param name="fileInfo">The file information</param>
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/// <returns>The file's hash</returns>
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/// <exception cref="Exception"></exception>
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/// <exception cref="InvalidOperationException"></exception>
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private static byte[]? HashFile(FileInfo? fileInfo)
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{
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if (fileInfo == null)
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{
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throw new Exception("HashFile: invalid file information");
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}
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using HashAlgorithm? sha = HashAlgorithm.Create("SHA-512");
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if (sha == null)
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{
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throw new InvalidOperationException("HashFile: SHA-512 algorithm does not exist");
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}
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using var inputStream = fileInfo.OpenRead();
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return sha.ComputeHash(inputStream);
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}
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}
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}
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