C#RSA对接JAVA中RSA方式

C#中通过FromXmlString属性加载的是XML形式,而JAVA中用到的是解析后的PEM格式的字符串,总之读取证书中信息无非是转换方式问题

        /// <summary>
        ///  c# 使用 java 的公钥进行rsa加密 utf8编码   通过解析公钥加密数据
        /// </summary>
        /// <param name="publickey"></param>
        /// <returns></returns>
        public static string RSAEncrypts(string content)
        {

            RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
            byte[] cipherbytes;
            X509Certificate2 x509Certificate2 = new X509Certificate2("D:\\Config\\dsptest.cer");
            //创建并返回当前算法对象的xml字符串表示形式
            string publicKeyString = x509Certificate2.PublicKey.Key.ToXmlString(false);
            rsa.FromXmlString(publicKeyString);
            //rsa.FromXmlString(RSAPublicKeyJava2DotNet(publicKeyString));
            cipherbytes = rsa.Encrypt(Encoding.UTF8.GetBytes(content), false);
            return Convert.ToBase64String(cipherbytes);
        }

            /// <summary>
            /// 私钥解密  通过解析私钥来解析数据  X509KeyStorageFlags.Exportable这个属性很关键是获取私钥信息的
            /// </summary>
            /// <param name="privatekey"></param>
            /// <param name="content"></param>
            /// <returns></returns>
         public static string RSADecrypt( string content)
        {
            byte[] rgb = Convert.FromBase64String(content);
            RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
            byte[] cipherbytes;
            X509Certificate2 x509Certificate2 = new X509Certificate2("D:\\Config\\test.pfx", "cfca1234", X509KeyStorageFlags.Exportable);
            //创建并返回当前算法对象的xml字符串表示形式
            //rsa.FromXmlString(RSAPrivateKeyJava2DotNet(Const.privatekey));

            rsa.FromXmlString(x509Certificate2.PrivateKey.ToXmlString(true));
            cipherbytes = rsa.Decrypt(Convert.FromBase64String(content), false);
            return Encoding.UTF8.GetString(cipherbytes);
        }

/***************以下是java提供的公私钥转成.net公私钥XML的方式*************************************/
/// <summary>
/// RSA公钥格式转换，java->.net
/// </summary>
/// <param name="publicKey">java生成的公钥</param>
/// <returns></returns>
public static string RSAPublicKeyJava2DotNet(string publicKey)
{
RsaKeyParameters publicKeyParam = (RsaKeyParameters)PublicKeyFactory.CreateKey(Convert.FromBase64String(publicKey));
return string.Format("<RSAKeyValue><Modulus>{0}</Modulus><Exponent>{1}</Exponent></RSAKeyValue>",
Convert.ToBase64String(publicKeyParam.Modulus.ToByteArrayUnsigned()),
Convert.ToBase64String(publicKeyParam.Exponent.ToByteArrayUnsigned()));
}

/// <summary>
/// RSA私钥格式转换，java->.net
/// </summary>
/// <param name="privateKey">java生成的RSA私钥</param>
/// <returns></returns>
public static string RSAPrivateKeyJava2DotNet(string privateKey)
{ RsaPrivateCrtKeyParameters privateKeyParam = (RsaPrivateCrtKeyParameters)PrivateKeyFactory.CreateKey(Convert.FromBase64String(privateKey));

return string.Format("<RSAKeyValue><Modulus>{0}</Modulus><Exponent>{1}</Exponent><P>{2}</P><Q>{3}</Q><DP>{4}</DP><DQ>{5}</DQ><InverseQ>{6}</InverseQ><D>{7}</D></RSAKeyValue>",
Convert.ToBase64String(privateKeyParam.Modulus.ToByteArrayUnsigned()),
Convert.ToBase64String(privateKeyParam.PublicExponent.ToByteArrayUnsigned()),
Convert.ToBase64String(privateKeyParam.P.ToByteArrayUnsigned()),
Convert.ToBase64String(privateKeyParam.Q.ToByteArrayUnsigned()),
Convert.ToBase64String(privateKeyParam.DP.ToByteArrayUnsigned()),
Convert.ToBase64String(privateKeyParam.DQ.ToByteArrayUnsigned()),
Convert.ToBase64String(privateKeyParam.QInv.ToByteArrayUnsigned()),
Convert.ToBase64String(privateKeyParam.Exponent.ToByteArrayUnsigned()));

}

原文地址：https://www.cnblogs.com/weihengblogs/p/11442014.html