C# MD5withRSA

支付平台公私钥加密

数字证书 签名与验证签名，采用RSA的公私钥体系。签名与验证签名都采用MD5withRSA算法。本XMl内容采用GBK编码格式

1、主动发送XMl报文或其他格式的报文，先用私钥证书xxx.pfx签名，然后Base64编码，然后发送。代码如下

比如发送内容为；String xmlContent ="************";

//创建xxx.pfx证书文件   证书密码为111111

X509Certificate2 objx5092 = new X509Certificate2(@“xxx.pfx”, "111111");

 System.Security.Cryptography.RSACryptoServiceProvider rsa = objx5092.PrivateKey as RSACryptoServiceProvider;
 hashvalue = rsa.SignData(data, "MD5");//为证书采用MD5withRSA 签名

 string check = Convert.ToBase64String(hashvalue);//签名后进行Base64编码  字符串check内容为发送的内容

2、接收的XMl报文或其他格式报文，先用Base64解码，然后用公钥xxx.cer进行签名验证

//创建公钥证书要发送内容即 xmlContent 的数组字节内容

byte[] data = Encoding.GetEncoding("GBK").GetBytes(xmlContent);

 X509Certificate2 pub = new X509Certificate2(@“xxx.cer”);

RSACryptoServiceProvider rsaPublic = pub.PublicKey.Key as RSACryptoServiceProvider;

//签名验证

 if (rsaPublic.VerifyData(data, "MD5", hashvalue))
{

//通过执行内容

----------

}