77 lines
2.4 KiB
C#
77 lines
2.4 KiB
C#
using System.Security.Cryptography;
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using System.Text;
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namespace Hutopy.Infrastructure.Security;
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// If we need to add special characters we can alternate between 2 pools.
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public static class PasswordGenerator
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{
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private const string LowerLetters = "abcdefghijklmnopqrstuvwxyz";
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private const string UpperLetters = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
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private const string Numbers = "0123456789";
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private const string SpecialCharacters = "!@#$%^&*()_+-=[];',./`~{}|:\"<>?";
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private static readonly Random Random = new();
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public static string Next(
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int length = 15,
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bool requireNumber = true,
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bool requireLowercase = true,
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bool requireCapital = true,
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bool requireSpecialCharacter = true)
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{
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// Create pools based on the requirements
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var characterPool = new StringBuilder();
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if (requireNumber)
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characterPool.Append(LowerLetters);
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if (requireCapital)
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characterPool.Append(UpperLetters);
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if (requireNumber)
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characterPool.Append(Numbers);
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if (requireSpecialCharacter)
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characterPool.Append(SpecialCharacters);
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// Ensure that the length is within the specified bounds
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var password = new char[length];
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// Ensure at least one character from each required category is included
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int index = 0;
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if (requireLowercase)
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password[index++] = LowerLetters[Random.Next(LowerLetters.Length)];
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if (requireCapital)
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password[index++] = UpperLetters[Random.Next(UpperLetters.Length)];
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if (requireNumber)
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password[index++] = Numbers[Random.Next(Numbers.Length)];
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if (requireSpecialCharacter)
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password[index++] = SpecialCharacters[Random.Next(SpecialCharacters.Length)];
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// Fill the rest with the password
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for (int i = index; i < length; i++)
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{
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password[i] = characterPool[RandomNumberGenerator.GetInt32(characterPool.Length)];
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}
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// Shuffle the password to randomize the placement of the required characters
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Shuffle(password);
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return new string(password);
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}
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private static void Shuffle(
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char[] array)
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{
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for (int i = array.Length - 1; i > 0; i--)
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{
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int j = Random.Next(i + 1);
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(array[i], array[j]) = (array[j], array[i]); // Swap elements
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}
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}
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}
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