从n，e和d计算RSAParameters

using System;
using System.Numerics;
using System.Security.Cryptography;

public class RSAParametersCalculator
{
    public static RSAParameters CalculateRSAParameters(BigInteger n, BigInteger e, BigInteger d)
    {
        // 计算 φ(n)
        BigInteger phi = (d * e - 1) / GetK(d, e);

        // 分解 n 为 p 和 q
        var (p, q) = Factorize(n);
        if (p == null || q == null)
        {
            throw new Exception("无法分解 n 为两个质数 p 和 q");
        }

        // 计算 dmp1, dmq1, iqmp
        BigInteger dmp1 = d % (p - 1);
        BigInteger dmq1 = d % (q - 1);
        BigInteger iqmp = ModularInverse(q, p);

        return new RSAParameters
        {
            Modulus = n.ToByteArray(),
            Exponent = e.ToByteArray(),
            D = d.ToByteArray(),
            P = p.ToByteArray(),
            Q = q.ToByteArray(),
            DP = dmp1.ToByteArray(),
            DQ = dmq1.ToByteArray(),
            InverseQ = iqmp.ToByteArray()
        };
    }

    private static int GetK(BigInteger d, BigInteger e)
    {
        // 找到最小的 k 使得 (d * e - 1) 能被 k 整除
        BigInteger phi = d * e - 1;
        for (int k = 1; ; k++)
        {
            if (phi % k == 0)
                return k;
        }
    }

    private static (BigInteger p, BigInteger q) Factorize(BigInteger n)
    {
        // 简单的试除法，适用于较小的 n
        for (BigInteger i = BigInteger.Two; i * i <= n; i++)
        {
            if (n % i == 0)
            {
                return (i, n / i);
            }
        }
        return (null, null);
    }

    private static BigInteger ModularInverse(BigInteger a, BigInteger m)
    {
        BigInteger m0 = m, t, q;
        BigInteger x0 = BigInteger.Zero, x1 = BigInteger.One;

        if (m == 1)
            return BigInteger.Zero;

        while (a > 1)
        {
            q = a / m;
            t = m;
            m = a % m;
            a = t;
            t = x0;
            x0 = x1 - q * x0;
            x1 = t;
        }

        if (x1 < 0)
            x1 += m0;

        return x1;
    }

    // 示例使用
    public static void Main()
    {
        BigInteger n = new BigInteger(3233); // 示例 n
        BigInteger e = new BigInteger(17);   // 示例 e
        BigInteger d = new BigInteger(2753); // 示例 d

        RSAParameters rsaParams = CalculateRSAParameters(n, e, d);
        Console.WriteLine("RSA 参数计算完成");
        // 可以根据需要使用 rsaParams
    }
}