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Merge pull request #1915 from Bond-009/hex

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Rewrite hex encoder/decoder
This commit is contained in:
dkanada
2019-11-02 04:03:36 +09:00
committed by GitHub
parent 48a99366b6 60cb256835
commit 3bfb36a67d
32 changed files with 285 additions and 113 deletions
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11
MediaBrowser.Common/Cryptography/PasswordHash.cs
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@@ -4,7 +4,6 @@ using System;
using System.Collections.Generic;
using System.IO;
using System.Text;
using static MediaBrowser.Common.HexHelper;
namespace MediaBrowser.Common.Cryptography
{
@@ -102,13 +101,13 @@ namespace MediaBrowser.Common.Cryptography
// Check if the string also contains a salt
if (splitted.Length - index == 2)
{
salt = FromHexString(splitted[index++]);
hash = FromHexString(splitted[index++]);
salt = Hex.Decode(splitted[index++]);
hash = Hex.Decode(splitted[index++]);
}
else
{
salt = Array.Empty<byte>();
hash = FromHexString(splitted[index++]);
hash = Hex.Decode(splitted[index++]);
}
return new PasswordHash(id, hash, salt, parameters);
@@ -145,11 +144,11 @@ namespace MediaBrowser.Common.Cryptography
if (Salt.Length != 0)
{
str.Append('$')
.Append(ToHexString(Salt));
.Append(Hex.Encode(Salt, false));
}
return str.Append('$')
.Append(ToHexString(Hash)).ToString();
.Append(Hex.Encode(Hash, false)).ToString();
}
}
}

48
MediaBrowser.Common/Extensions/CollectionExtensions.cs
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@@ -1,48 +0,0 @@
#pragma warning disable CS1591
using System.Collections.Generic;
namespace MediaBrowser.Common.Extensions
{
// The MS CollectionExtensions are only available in netcoreapp
public static class CollectionExtensions
{
public static TValue GetValueOrDefault<TKey, TValue>(this IReadOnlyDictionary<TKey, TValue> dictionary, TKey key)
{
dictionary.TryGetValue(key, out var ret);
return ret;
}
/// <summary>
/// Copies all the elements of the current collection to the specified list
/// starting at the specified destination array index. The index is specified as a 32-bit integer.
/// </summary>
/// <param name="source">The current collection that is the source of the elements.</param>
/// <param name="destination">The list that is the destination of the elements copied from the current collection.</param>
/// <param name="index">A 32-bit integer that represents the index in <c>destination</c> at which copying begins.</param>
/// <typeparam name="T"></typeparam>
public static void CopyTo<T>(this IReadOnlyList<T> source, IList<T> destination, int index = 0)
{
for (int i = 0; i < source.Count; i++)
{
destination[index + i] = source[i];
}
}
/// <summary>
/// Copies all the elements of the current collection to the specified list
/// starting at the specified destination array index. The index is specified as a 32-bit integer.
/// </summary>
/// <param name="source">The current collection that is the source of the elements.</param>
/// <param name="destination">The list that is the destination of the elements copied from the current collection.</param>
/// <param name="index">A 32-bit integer that represents the index in <c>destination</c> at which copying begins.</param>
/// <typeparam name="T"></typeparam>
public static void CopyTo<T>(this IReadOnlyCollection<T> source, IList<T> destination, int index = 0)
{
foreach (T item in source)
{
destination[index++] = item;
}
}
}
}

26
MediaBrowser.Common/Extensions/CopyToExtensions.cs Normal file
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@@ -0,0 +1,26 @@
using System.Collections.Generic;
namespace MediaBrowser.Common.Extensions
{
/// <summary>
/// Provides <c>CopyTo</c> extensions methods for <see cref="IReadOnlyList{T}" />.
/// </summary>
public static class CollectionExtensions
{
/// <summary>
/// Copies all the elements of the current collection to the specified list
/// starting at the specified destination array index. The index is specified as a 32-bit integer.
/// </summary>
/// <param name="source">The current collection that is the source of the elements.</param>
/// <param name="destination">The list that is the destination of the elements copied from the current collection.</param>
/// <param name="index">A 32-bit integer that represents the index in <c>destination</c> at which copying begins.</param>
/// <typeparam name="T"></typeparam>
public static void CopyTo<T>(this IReadOnlyList<T> source, IList<T> destination, int index = 0)
{
for (int i = 0; i < source.Count; i++)
{
destination[index + i] = source[i];
}
}
}
}

94
MediaBrowser.Common/Hex.cs Normal file
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@@ -0,0 +1,94 @@
using System;
using System.Diagnostics.CodeAnalysis;
namespace MediaBrowser.Common
{
/// <summary>
/// Encoding and decoding hex strings.
/// </summary>
public static class Hex
{
internal const string HexCharsLower = "0123456789abcdef";
internal const string HexCharsUpper = "0123456789ABCDEF";
internal const int LastHexSymbol = 0x66; // 102: f
/// <summary>
/// Map from an ASCII char to its hex value shifted,
/// e.g. <c>b</c> -> 11. 0xFF means it's not a hex symbol.
/// </summary>
/// <value></value>
internal static ReadOnlySpan<byte> HexLookup => new byte[] {
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f
};
/// <summary>
/// Encodes <c>bytes</c> as a hex string.
/// </summary>
/// <param name="bytes"></param>
/// <param name="lowercase"></param>
/// <returns><c>bytes</c> as a hex string.</returns>
public static string Encode(ReadOnlySpan<byte> bytes, bool lowercase = true)
{
var hexChars = lowercase ? HexCharsLower : HexCharsUpper;
// TODO: use string.Create when it's supports spans
// Ref: https://github.com/dotnet/corefx/issues/29120
char[] s = new char[bytes.Length * 2];
int j = 0;
for (int i = 0; i < bytes.Length; i++)
{
s[j++] = hexChars[bytes[i] >> 4];
s[j++] = hexChars[bytes[i] & 0x0f];
}
return new string(s);
}
/// <summary>
/// Decodes a hex string into bytes.
/// </summary>
/// <param name="str">The <see cref="string" />.</param>
/// <returns>The decoded bytes.</returns>
public static byte[] Decode(ReadOnlySpan<char> str)
{
if (str.Length == 0)
{
return Array.Empty<byte>();
}
var unHex = HexLookup;
int byteLen = str.Length / 2;
byte[] bytes = new byte[byteLen];
int i = 0;
for (int j = 0; j < byteLen; j++)
{
byte a;
byte b;
if (str[i] > LastHexSymbol
|| (a = unHex[str[i++]]) == 0xFF
|| str[i] > LastHexSymbol
|| (b = unHex[str[i++]]) == 0xFF)
{
ThrowArgumentException(nameof(str));
break; // Unreachable
}
bytes[j] = (byte)((a * 16) | b);
}
return bytes;
}
[DoesNotReturn]
private static void ThrowArgumentException(string paramName)
=> throw new ArgumentException("Character is not a hex symbol.", paramName);
}
}

24
MediaBrowser.Common/HexHelper.cs
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@@ -1,24 +0,0 @@
#pragma warning disable CS1591
using System;
using System.Globalization;
namespace MediaBrowser.Common
{
public static class HexHelper
{
public static byte[] FromHexString(string str)
{
byte[] bytes = new byte[str.Length / 2];
for (int i = 0; i < str.Length; i += 2)
{
bytes[i / 2] = byte.Parse(str.Substring(i, 2), NumberStyles.HexNumber, CultureInfo.InvariantCulture);
}
return bytes;
}
public static string ToHexString(byte[] bytes)
=> BitConverter.ToString(bytes).Replace("-", "");
}
}

2
MediaBrowser.Common/MediaBrowser.Common.csproj
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@@ -21,7 +21,7 @@
</ItemGroup>
<PropertyGroup>
<TargetFramework>netstandard2.0</TargetFramework>
<TargetFramework>netstandard2.1</TargetFramework>
<GenerateAssemblyInfo>false</GenerateAssemblyInfo>
<GenerateDocumentationFile>true</GenerateDocumentationFile>
<TreatWarningsAsErrors>true</TreatWarningsAsErrors>