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Use stronger method for generating randoms

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Slendy 2023-02-05 21:25:59 -06:00
commit abfa53ca47
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2 changed files with 24 additions and 37 deletions
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15
ProjectLighthouse/Helpers/CensorHelper.cs
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@ -39,15 +39,13 @@ public static class CensorHelper
{ {
StringBuilder sb = new(); StringBuilder sb = new();
char prevRandomChar = '\0';
sb.Append(message.AsSpan(0, profanityIndex)); sb.Append(message.AsSpan(0, profanityIndex));
switch (CensorConfiguration.Instance.UserInputFilterMode) switch (CensorConfiguration.Instance.UserInputFilterMode)
{ {
case FilterMode.Random: case FilterMode.Random:
char prevRandomChar = '\0';
for (int i = 0; i < profanityLength; i++) for (int i = 0; i < profanityLength; i++)
lock(CryptoHelper.Random)
{ {
if (message[i] == ' ') if (message[i] == ' ')
{ {
@ -55,11 +53,10 @@ public static class CensorHelper
} }
else else
{ {
char randomChar = randomCharacters[CryptoHelper.Random.Next(0, randomCharacters.Length - 1)]; char randomChar = randomCharacters[CryptoHelper.GenerateRandomInt32(0, randomCharacters.Length)];
if (randomChar == prevRandomChar) randomChar = randomCharacters[CryptoHelper.Random.Next(0, randomCharacters.Length - 1)]; if (randomChar == prevRandomChar) randomChar = randomCharacters[CryptoHelper.GenerateRandomInt32(0, randomCharacters.Length)];
prevRandomChar = randomChar; prevRandomChar = randomChar;
sb.Append(randomChar); sb.Append(randomChar);
} }
} }
@ -73,12 +70,8 @@ public static class CensorHelper
break; break;
case FilterMode.Furry: case FilterMode.Furry:
lock(CryptoHelper.Random) string randomWord = randomFurry[CryptoHelper.GenerateRandomInt32(0, randomFurry.Length)];
{
string randomWord = randomFurry[CryptoHelper.Random.Next(0, randomFurry.Length - 1)];
sb.Append(randomWord); sb.Append(randomWord);
}
break; break;
case FilterMode.None: break; case FilterMode.None: break;
default: throw new ArgumentOutOfRangeException(nameof(message)); default: throw new ArgumentOutOfRangeException(nameof(message));

22
ProjectLighthouse/Helpers/CryptoHelper.cs
View file

@ -13,10 +13,6 @@ namespace LBPUnion.ProjectLighthouse.Helpers;
[SuppressMessage("ReSharper", "UnusedMember.Global")] [SuppressMessage("ReSharper", "UnusedMember.Global")]
public static class CryptoHelper public static class CryptoHelper
{ {
/// <summary>
/// An instance of Random. Must be locked when in use.
/// </summary>
public static readonly Random Random = new();
// private static readonly SHA1 sha1 = SHA1.Create(); // private static readonly SHA1 sha1 = SHA1.Create();
private static readonly SHA256 sha256 = SHA256.Create(); private static readonly SHA256 sha256 = SHA256.Create();
@ -64,17 +60,15 @@ public static class CryptoHelper
/// </summary> /// </summary>
/// <param name="count">The amount of bytes to generate.</param> /// <param name="count">The amount of bytes to generate.</param>
/// <returns>The bytes generated</returns> /// <returns>The bytes generated</returns>
public static IEnumerable<byte> GenerateRandomBytes(int count) public static IEnumerable<byte> GenerateRandomBytes(int count) => RandomNumberGenerator.GetBytes(count);
{
byte[] b = new byte[count];
lock(Random) /// <summary>
{ /// Generates a random bounded 32 bit integer
Random.NextBytes(b); /// </summary>
} /// <param name="fromInclusive">The lowest possible integer than can be generated, inclusive</param>
/// <param name="toExclusive">The highest possible integer than can be generated, exclusive</param>
return b; /// <returns>The randomly generated integer</returns>
} public static int GenerateRandomInt32(int fromInclusive, int toExclusive) => RandomNumberGenerator.GetInt32(fromInclusive, toExclusive);
public static string ToBase64(string str) public static string ToBase64(string str)
{ {