C#RSA对接JAVA中RSA方式代码实例

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()));

}

以上实例大家可以测试下，感谢大家对的支持。