将PEM编码的RSA私钥转换为AsymmetricKeyParameter

using System;
using System.IO;
using Org.BouncyCastle.Crypto;
using Org.BouncyCastle.OpenSsl;

public class RSAKeyConverter
{
    public static AsymmetricKeyParameter ConvertPEMToAsymmetricKey(string pemPrivateKeyPath)
    {
        // 读取PEM文件中的私钥内容
        string pemPrivateKey = File.ReadAllText(pemPrivateKeyPath);

        // 解析PEM编码的私钥
        var pemReader = new PemReader(new StringReader(pemPrivateKey));
        var keyPair = (AsymmetricCipherKeyPair)pemReader.ReadObject();

        // 提取关键信息
        var rsaPrivateKey = (RsaPrivateCrtKeyParameters)keyPair.Private;

        // 构建AsymmetricKeyParameter对象
        var asymmetricKeyParameter = new AsymmetricKeyParameter(rsaPrivateKey.IsPrivate, rsaPrivateKey.Modulus, rsaPrivateKey.Exponent);

        return asymmetricKeyParameter;
    }
}

// 使用示例
string pemPrivateKeyPath = "path/to/private_key.pem";
AsymmetricKeyParameter privateKey = RSAKeyConverter.ConvertPEMToAsymmetricKey(pemPrivateKeyPath);