src/Library/NetPro.Utility/Helpers/Internal/RSAHelper.cs

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using System.IO;
using System.Security.Cryptography;
using System.Text;

namespace System.NetPro
{
    /// <summary>
    /// RSA加解密 使用OpenSSL的公钥加密/私钥解密 
    /// 公私钥请使用openssl生成  ssh-keygen -t rsa 命令生成的公钥私钥是不行的   
    /// </summary>
    internal class RsaHelper
    {
        private readonly RSA _privateKeyRsaProvider;
        private readonly RSA _publicKeyRsaProvider;
        private readonly HashAlgorithmName _hashAlgorithmName;
        private readonly Encoding _encoding;

        /// <summary>
        /// 实例化RSAHelper
        /// </summary>
        /// <param name="rsaType">加密算法类型 RSA SHA1;RSA2 SHA256 密钥长度至少为2048</param>
        /// <param name="encoding">编码类型</param>
        /// <param name="privateKey">私钥</param>
        /// <param name="publicKey">公钥</param>
        public RsaHelper(RSAType rsaType, Encoding encoding, string privateKey = null, string publicKey = null)
        {
            _encoding = encoding;
            if (!string.IsNullOrEmpty(privateKey))
            {
                _privateKeyRsaProvider = CreateRsaProviderFromPrivateKey(privateKey);
            }

            if (!string.IsNullOrEmpty(publicKey))
            {
                _publicKeyRsaProvider = CreateRsaProviderFromPublicKey(publicKey);
            }

            _hashAlgorithmName = rsaType == RSAType.RSA ? HashAlgorithmName.SHA1 : HashAlgorithmName.SHA256;
        }

        #region 使用私钥签名

        /// <summary>
        /// 使用私钥签名
        /// </summary>
        /// <param name="data">原始数据</param>
        /// <returns></returns>
        public string Sign(string data)
        {
            byte[] dataBytes = _encoding.GetBytes(data);

            var signatureBytes = _privateKeyRsaProvider.SignData(dataBytes, _hashAlgorithmName, RSASignaturePadding.Pkcs1);

            return Convert.ToBase64String(signatureBytes);
        }

        #endregion

        #region 使用公钥验证签名