/// <summary>
/// 验证RSA签名
/// </summary>
/// <param name="data"></param>
/// <param name="signature"></param>
/// <param name="publicKey"></param>
/// <returns></returns>
public static bool Verify(byte[] data, string signature, string publicKey)
{
// 这里参数是 publicKey，而不是 certname 主要是为了方便，
// publicKey 可以写死在代码中
return(X509Finder.LoadFromPublicKey(publicKey).Verify(data, signature));
//if( data == null )
// return signature == null;
//// 公钥放在程序集中
//byte[] bb = Encoding.ASCII.GetBytes(publicKey.Trim());
// // 注意：下面这行代码在 .NET 3.5及以下版本中会有问题：每次会在临时目录下创建二个空文件，最后调用 Path.GetTempFilename() 时，当临时文件超过65536时会出现异常
// // 可参考以链接： https://blogs.msmvps.com/infinitec/2009/03/29/x509certificate2-constructor-creates-two-empty-files-in-the-temporary-files-directory/
// // 对应解决办法：
// // 1，用 byte[] 生成临时文件，文件临时文件中构造X509Certificate2实例
// // 2，创建临时文件时，计算publicKey的sha1值，用来做临时文件名，用完后不删除，就当是文件缓存了
// X509Certificate2 cert = new X509Certificate2(bb);
//if( cert.HasPrivateKey ) // 增加这个检查可以防止把私钥写到字符串中，从而泄露私钥
// throw new ArgumentException("字符串证书中不允许包含私钥！");
//return Verify(data, signature, cert);
}
/// <summary>
/// 用指定的证书名称对数据做签名
/// </summary>
/// <param name="data"></param>
/// <param name="certName"></param>
/// <returns></returns>
public static string Sign(byte[] data, string certName)
{
return(X509Finder.FindBySubject(certName, true).Sign(data));
//if( data == null )
// return null;
//// 查找私钥，优先在计算机的证书存储中查找
//X509Certificate2 cert = FindCertificate(certName);
//if( cert == null )
// throw new ArgumentException($"加密证书{certName}不存在。");
//return Sign(data, cert);
}
/// <summary>
/// 根据证书名查找X509证书，优先查找LocalMachine存储区域，如果失败则再查找CurrentUser
/// </summary>
/// <param name="certName"></param>
/// <returns></returns>
public static X509Certificate2 FindCertificate(string certName)
{
return(X509Finder.FindBySubject(certName));
//// 先查找 LocalMachine
//X509Certificate2 cert = FindCertificate(certName, StoreName.My, StoreLocation.LocalMachine);
//if( cert == null ) {
// // 再查找 CurrentUser
// cert = FindCertificate(certName, StoreName.My, StoreLocation.CurrentUser);
//}
//return cert;
}
/// <summary>
/// RSA数据加密
/// </summary>
/// <param name="data">二进制数据</param>
/// <param name="certName">证书名称</param>
/// <returns>加密后的数据</returns>
public static byte[] Encrypt(byte[] data, string certName)
{
return(X509Finder.FindBySubject(certName, true).Encrypt(data));
//if( data == null )
// return null;
//// 私钥存在在计算机的证书存储中
//X509Certificate2 cert = FindCertificate(certName);
//if( cert == null )
// throw new ArgumentException($"加密证书{certName}不存在。");
//// 获得证书公钥
//RSACryptoServiceProvider rsa = (RSACryptoServiceProvider)cert.PublicKey.Key;
//// 注意：这个方法只能加密比较短的内容（一般是密钥）
//return rsa.Encrypt(data, true);
}
/// <summary>
/// 用X509证书解密数据
/// </summary>
/// <param name="data"></param>
/// <param name="certName"></param>
/// <returns></returns>
public static byte[] Decrypt(byte[] data, string certName)
{
return(X509Finder.FindBySubject(certName, true).Decrypt(data));
//if( data == null )
// return null;
//// 私钥存在在计算机的证书存储中
//X509Certificate2 cert = FindCertificate(certName);
//if( cert == null )
// throw new ArgumentException($"加密证书{certName}不存在。");
//// 读取证书私钥
//RSACryptoServiceProvider rsa = (RSACryptoServiceProvider)cert.PrivateKey;
//if( rsa == null )
// throw new ArgumentException("证书没有私钥。");
//return rsa.Decrypt(data, true);
}
/// <summary>
/// 根据指定的证书名称和位置，查找证书。
/// </summary>
/// <param name="certName"></param>
/// <param name="storeName"></param>
/// <param name="storeLocation"></param>
/// <returns></returns>
public static X509Certificate2 FindCertificate(string certName, StoreName storeName, StoreLocation storeLocation)
{
return(X509Finder.FindBySubject(certName, storeLocation, storeName));
//// 查找这个存储区域，是与生成证书所使用的命令行对应的： -ss my -sr localMachine
//X509Store x509Store = new X509Store(storeName, storeLocation);
//try {
// x509Store.Open(OpenFlags.ReadOnly);
// string subjectName = "CN=" + certName;
// foreach( X509Certificate2 current in x509Store.Certificates )
// if( current.Subject == subjectName )
// return current;
//}
//finally {
// x509Store.Close();
//}
//return null;
}