79 lines
2.7 KiB
C#
79 lines
2.7 KiB
C#
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using System.Security.Cryptography;
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using System.Text;
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namespace LMS.Common.Password
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{
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public static class PasswordGenerator
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{
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private const string LowercaseChars = "abcdefghijklmnopqrstuvwxyz";
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private const string UppercaseChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
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private const string NumberChars = "0123456789";
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private const string SpecialChars = "@$!%*?.&";
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private const string AllChars = LowercaseChars + UppercaseChars + NumberChars + SpecialChars;
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/// <summary>
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/// 生成指定长度的随机密码
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/// </summary>
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/// <param name="length">密码长度</param>
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/// <returns>随机生成的密码</returns>
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public static string GeneratePassword(int length)
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{
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if (length < 4)
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{
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throw new ArgumentException("密码长度必须至少为4个字符", nameof(length));
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}
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// 使用加密安全的随机数生成器
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using var rng = RandomNumberGenerator.Create();
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// 确保密码包含至少一个小写字母、一个大写字母、一个数字和一个特殊字符
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var password = new StringBuilder();
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// 添加每种类型的至少一个字符
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password.Append(GetRandomChar(LowercaseChars, rng));
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password.Append(GetRandomChar(UppercaseChars, rng));
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password.Append(GetRandomChar(NumberChars, rng));
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password.Append(GetRandomChar(SpecialChars, rng));
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// 添加剩余的随机字符
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for (int i = 4; i < length; i++)
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{
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password.Append(GetRandomChar(AllChars, rng));
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}
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// 打乱字符顺序
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return ShuffleString(password.ToString(), rng);
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}
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/// <summary>
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/// 从指定字符集中获取一个随机字符
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/// </summary>
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private static char GetRandomChar(string chars, RandomNumberGenerator rng)
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{
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byte[] data = new byte[1];
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rng.GetBytes(data);
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return chars[data[0] % chars.Length];
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}
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/// <summary>
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/// 打乱字符串中字符的顺序
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/// </summary>
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private static string ShuffleString(string input, RandomNumberGenerator rng)
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{
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char[] array = input.ToCharArray();
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int n = array.Length;
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while (n > 1)
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{
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byte[] box = new byte[1];
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rng.GetBytes(box);
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int k = box[0] % n;
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n--;
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char temp = array[n];
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array[n] = array[k];
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array[k] = temp;
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}
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return new string(array);
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}
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}
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}
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