java从P7B文件获取证书链

Question

如何从P7B文件中获取证书链。 P7B文件仅包含证书和公钥。我想获得证书链，并在pdf文件中附上签名。我用Bouncy Castle图书馆来做这个

任何帮助都将不胜感激

Answer 1

p7b文件的导入取决于文件的格式。如果是DER格式，则此代码应适用：

        List<X509Certificate> certList = new List<X509Certificate>();
        var signedData = File.ReadAllBytes(filepath);
        CmsSignedData s = new CmsSignedData(signedData);
        IX509Store certs = s.GetCertificates("Collection");
        ICollection cCol = certs.GetMatches(null);
        var cEn = cCol.GetEnumerator();
        while (cEn.MoveNext())
        {
            certList.Add((X509Certificate)cEn.Current);
        }
        return certList;