C# Rsa加密（私钥加密、公钥解密）

这个也是和java版本的加密对比过了，结果是一样的，且不用像用c#自带的rsa加密一样先转换一遍密钥，不多比比，直接上代码：

using Org.BouncyCastle.Crypto;
using Org.BouncyCastle.Crypto.Engines;
using Org.BouncyCastle.Crypto.Parameters;
using Org.BouncyCastle.Security;
using System;using System.Text;

public class RSAUtil
{
    #region 私钥加密
    /// <summary>
    /// 基于BouncyCastle的RSA私钥加密
    /// </summary>
    /// <param name="privateKeyJava"></param>
    /// <param name="data"></param>
    /// <returns></returns>
    public static string EncryptPrivateKeyJava(string privateKeyJava, string data, string encoding = "UTF-8")
    {
        RsaKeyParameters privateKeyParam = (RsaKeyParameters)PrivateKeyFactory.CreateKey(Convert.FromBase64String(privateKeyJava));
        byte[] cipherbytes = Encoding.GetEncoding(encoding).GetBytes(data);
        RsaEngine rsa = new RsaEngine();
        rsa.Init(true, privateKeyParam);//参数true表示加密/false表示解密。
        cipherbytes = rsa.ProcessBlock(cipherbytes, 0, cipherbytes.Length);
        return Convert.ToBase64String(cipherbytes);
    }
    #endregion

    #region  公钥解密
    /// <summary>
    /// 基于BouncyCastle的RSA公钥解密
    /// </summary>
    /// <param name="publicKeyJava"></param>
    /// <param name="data"></param>
    /// <param name="encoding"></param>
    /// <returns></returns>
    public static string DecryptPublicKeyJava(string publicKeyJava, string data, string encoding = "UTF-8")
    {
        RsaKeyParameters publicKeyParam = (RsaKeyParameters)PublicKeyFactory.CreateKey(Convert.FromBase64String(publicKeyJava));
        byte[] cipherbytes = Convert.FromBase64String(data);
        RsaEngine rsa = new RsaEngine();
        rsa.Init(false, publicKeyParam);//参数true表示加密/false表示解密。
        cipherbytes = rsa.ProcessBlock(cipherbytes, 0, cipherbytes.Length);
        return Encoding.GetEncoding(encoding).GetString(cipherbytes);
    }
    #endregion


    #region 加签    
    /// <summary>
    /// 基于BouncyCastle的RSA签名
    /// </summary>
    /// <param name="data"></param>
    /// <param name="privateKeyJava"></param>
    /// <param name="hashAlgorithm">JAVA的和.NET的不一样，如：MD5(.NET)等同于MD5withRSA(JAVA)</param>
    /// <param name="encoding"></param>
    /// <param name="mode">模式，true是验签，false是加签</param>
    /// <returns></returns>
    public static string RSASignJavaBouncyCastle(string data, string privateKeyJava, string hashAlgorithm = "MD5withRSA", string encoding = "UTF-8")
    {
        RsaKeyParameters privateKeyParam = (RsaKeyParameters)PrivateKeyFactory.CreateKey(Convert.FromBase64String(privateKeyJava));
        ISigner signer = SignerUtilities.GetSigner(hashAlgorithm);
        signer.Init(true, privateKeyParam);//参数为false验签，参数为true加签
        var dataByte = Encoding.GetEncoding(encoding).GetBytes(data);
        signer.BlockUpdate(dataByte, 0, dataByte.Length);
        //return Encoding.GetEncoding(encoding).GetString(signer.GenerateSignature()); //签名结果 非Base64String
        return Convert.ToBase64String(signer.GenerateSignature());
    }
    #endregion


    #region 验签
    /// <summary>
    /// 基于BouncyCastle的RSA签名
    /// </summary>
    /// <param name="data">源数据</param>
    /// <param name="publicKeyJava"></param>
    /// <param name="signature">base64签名</param>
    /// <param name="hashAlgorithm">JAVA的和.NET的不一样，如：MD5(.NET)等同于MD5withRSA(JAVA)</param>
    /// <param name="encoding"></param>
    /// <returns></returns>
    public static bool VerifyJavaBouncyCastle(string data, string publicKeyJava, string signature, string hashAlgorithm = "MD5withRSA", string encoding = "UTF-8")
    {
        RsaKeyParameters publicKeyParam = (RsaKeyParameters)PublicKeyFactory.CreateKey(Convert.FromBase64String(publicKeyJava));
        ISigner signer = SignerUtilities.GetSigner(hashAlgorithm);
        signer.Init(false, publicKeyParam);
        byte[] dataByte = Encoding.GetEncoding(encoding).GetBytes(data);
        signer.BlockUpdate(dataByte, 0, dataByte.Length);
        byte[] signatureByte = Convert.FromBase64String(signature);
        return signer.VerifySignature(signatureByte);
    }
    #endregion
}

有一点要注意，使用之前要装个”BouncyCastle的“包，在nuget中安装

标签：公钥,私钥,string,encoding,RsaKeyParameters,signer,BouncyCastle,加密,cipherbytes
来源： https://www.cnblogs.com/Transmuter/p/13907207.html