您如何从X509Certificate2解析主题备用名称？ [英] How do you parse the Subject Alternate Names from an X509Certificate2?

问题描述

是否有一种简单的方法来从X509Certificate2对象获取主题备用名称？

Is there an easy way to get the Subject Alternate Names from an X509Certificate2 object?

        foreach (X509Extension ext in certificate.Extensions)
        {
            if (ext.Oid.Value.Equals(/* SAN OID */"2.5.29.17"))
            {
                byte[] raw = ext.RawData;
                // ?????? parse to get type and name ????????
            }
        }

推荐答案

使用扩展名的格式化方法

X509Certificate2 cert = /* your code here */;

foreach (X509Extension extension in cert.Extensions)
{
    // Create an AsnEncodedData object using the extensions information.
    AsnEncodedData asndata = new AsnEncodedData(extension.Oid, extension.RawData);
    Console.WriteLine("Extension type: {0}", extension.Oid.FriendlyName);
    Console.WriteLine("Oid value: {0}",asndata.Oid.Value);
    Console.WriteLine("Raw data length: {0} {1}", asndata.RawData.Length, Environment.NewLine);
    Console.WriteLine(asndata.Format(true));
}

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