从.NET中的Authenticode签名文件中获取时间戳

我们需要validation二进制文件是否使用数字签名（Authenticode）正确签名。 这可以通过signtool.exe轻松实现。 但是，我们需要一种自动方式来validation签名者名称和时间戳。 这在使用CryptQueryObject() API的本机C ++中是可行的，如以下精彩示例所示： 如何从Authenticode签名的可执行文件获取信息

然而，我们生活在一个托管的世界:)因此寻找相同问题的C＃解决方案。 直接的方法是pInvoke Crypt32.dll，一切都完成了。 但是System.Security.Cryptography.X509Certificates命名空间中有类似的托管API。 X509Certificate2类似乎提供了一些信息但没有时间戳。 现在我们来看原始问题，我们如何才能在C Sharp中获得数字签名的时间戳？

Answer 1

回到最初的问题，我找不到托管方式，所以最终使用pInvoke如下：

 public static bool IsTimestamped(string filename) { try { int encodingType; int contentType; int formatType; IntPtr certStore = IntPtr.Zero; IntPtr cryptMsg = IntPtr.Zero; IntPtr context = IntPtr.Zero; if (!WinCrypt.CryptQueryObject( WinCrypt.CERT_QUERY_OBJECT_FILE, Marshal.StringToHGlobalUni(filename), WinCrypt.CERT_QUERY_CONTENT_FLAG_ALL, WinCrypt.CERT_QUERY_FORMAT_FLAG_ALL, 0, out encodingType, out contentType, out formatType, ref certStore, ref cryptMsg, ref context)) { throw new Win32Exception(Marshal.GetLastWin32Error()); } //expecting contentType=10; CERT_QUERY_CONTENT_PKCS7_SIGNED_EMBED //Logger.LogInfo(string.Format("Querying file '{0}':", filename)); //Logger.LogInfo(string.Format(" Encoding Type: {0}", encodingType)); //Logger.LogInfo(string.Format(" Content Type: {0}", contentType)); //Logger.LogInfo(string.Format(" Format Type: {0}", formatType)); //Logger.LogInfo(string.Format(" Cert Store: {0}", certStore.ToInt32())); //Logger.LogInfo(string.Format(" Crypt Msg: {0}", cryptMsg.ToInt32())); //Logger.LogInfo(string.Format(" Context: {0}", context.ToInt32())); // Get size of the encoded message. int cbData = 0; if (!WinCrypt.CryptMsgGetParam( cryptMsg, WinCrypt.CMSG_ENCODED_MESSAGE,//Crypt32.CMSG_SIGNER_INFO_PARAM, 0, IntPtr.Zero, ref cbData)) { throw new Win32Exception(Marshal.GetLastWin32Error()); } var vData = new byte[cbData]; // Get the encoded message. if (!WinCrypt.CryptMsgGetParam( cryptMsg, WinCrypt.CMSG_ENCODED_MESSAGE,//Crypt32.CMSG_SIGNER_INFO_PARAM, 0, vData, ref cbData)) { throw new Win32Exception(Marshal.GetLastWin32Error()); } var signedCms = new SignedCms(); signedCms.Decode(vData); foreach (var signerInfo in signedCms.SignerInfos) { foreach (var unsignedAttribute in signerInfo.UnsignedAttributes) { if (unsignedAttribute.Oid.Value == WinCrypt.szOID_RSA_counterSign) { //Note at this point we assume this counter signature is the timestamp //refer to http://support.microsoft.com/kb/323809 for the origins //TODO: extract timestamp value, if required return true; } } } } catch (Exception) { // no logging } return false; } 

和WinCrypt.cs包含以下内容：

 using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Runtime.InteropServices; namespace MyNamespace.Win32 { static class WinCrypt { [StructLayout(LayoutKind.Sequential)] public struct BLOB { public int cbData; public IntPtr pbData; } [StructLayout(LayoutKind.Sequential)] public struct CRYPT_ALGORITHM_IDENTIFIER { public String pszObjId; BLOB Parameters; } [StructLayout(LayoutKind.Sequential)] public struct CERT_ID { public int dwIdChoice; public BLOB IssuerSerialNumberOrKeyIdOrHashId; } [StructLayoutAttribute(LayoutKind.Sequential)] public struct SIGNER_SUBJECT_INFO { /// DWORD->unsigned int public uint cbSize; /// DWORD* public System.IntPtr pdwIndex; /// DWORD->unsigned int public uint dwSubjectChoice; /// SubjectChoiceUnion public SubjectChoiceUnion Union1; } [StructLayoutAttribute(LayoutKind.Explicit)] public struct SubjectChoiceUnion { /// SIGNER_FILE_INFO* [FieldOffsetAttribute(0)] public System.IntPtr pSignerFileInfo; /// SIGNER_BLOB_INFO* [FieldOffsetAttribute(0)] public System.IntPtr pSignerBlobInfo; } [StructLayout(LayoutKind.Sequential)] public struct CERT_NAME_BLOB { public uint cbData; [MarshalAs(UnmanagedType.LPArray, SizeParamIndex = 0)] public byte[] pbData; } [StructLayout(LayoutKind.Sequential)] public struct CRYPT_INTEGER_BLOB { public UInt32 cbData; public IntPtr pbData; } [StructLayout(LayoutKind.Sequential)] public struct CRYPT_ATTR_BLOB { public uint cbData; [MarshalAs(UnmanagedType.LPArray, SizeParamIndex = 0)] public byte[] pbData; } [StructLayout(LayoutKind.Sequential)] public struct CRYPT_ATTRIBUTE { [MarshalAs(UnmanagedType.LPStr)] public string pszObjId; public uint cValue; [MarshalAs(UnmanagedType.LPStruct)] public CRYPT_ATTR_BLOB rgValue; } [StructLayout(LayoutKind.Sequential)] public struct CMSG_SIGNER_INFO { public int dwVersion; private CERT_NAME_BLOB Issuer; CRYPT_INTEGER_BLOB SerialNumber; CRYPT_ALGORITHM_IDENTIFIER HashAlgorithm; CRYPT_ALGORITHM_IDENTIFIER HashEncryptionAlgorithm; BLOB EncryptedHash; CRYPT_ATTRIBUTE[] AuthAttrs; CRYPT_ATTRIBUTE[] UnauthAttrs; } [DllImport("crypt32.dll", CharSet = CharSet.Auto, SetLastError = true)] public static extern Boolean CryptQueryObject( int dwObjectType, IntPtr pvObject, int dwExpectedContentTypeFlags, int dwExpectedFormatTypeFlags, int dwFlags, out int pdwMsgAndCertEncodingType, out int pdwContentType, out int pdwFormatType, ref IntPtr phCertStore, ref IntPtr phMsg, ref IntPtr ppvContext); [DllImport("crypt32.dll", CharSet = CharSet.Auto, SetLastError = true)] public static extern Boolean CryptMsgGetParam( IntPtr hCryptMsg, int dwParamType, int dwIndex, IntPtr pvData, ref int pcbData ); [DllImport("crypt32.dll", CharSet = CharSet.Auto, SetLastError = true)] public static extern Boolean CryptMsgGetParam( IntPtr hCryptMsg, int dwParamType, int dwIndex, [In, Out] byte[] vData, ref int pcbData ); [DllImport("crypt32.dll", CharSet = CharSet.Auto, SetLastError = true)] [return: MarshalAs(UnmanagedType.Bool)] public static extern bool CryptDecodeObject( uint CertEncodingType, UIntPtr lpszStructType, byte[] pbEncoded, uint cbEncoded, uint flags, [In, Out] byte[] pvStructInfo, ref uint cbStructInfo); public const int CRYPT_ASN_ENCODING = 0x00000001; public const int CRYPT_NDR_ENCODING = 0x00000002; public const int X509_ASN_ENCODING = 0x00000001; public const int X509_NDR_ENCODING = 0x00000002; public const int PKCS_7_ASN_ENCODING = 0x00010000; public const int PKCS_7_NDR_ENCODING = 0x00020000; public static UIntPtr PKCS7_SIGNER_INFO = new UIntPtr(500); public static UIntPtr CMS_SIGNER_INFO = new UIntPtr(501); public static string szOID_RSA_signingTime = "1.2.840.113549.1.9.5"; public static string szOID_RSA_counterSign = "1.2.840.113549.1.9.6"; //+------------------------------------------------------------------------- // Get parameter types and their corresponding data structure definitions. //-------------------------------------------------------------------------- public const int CMSG_TYPE_PARAM = 1; public const int CMSG_CONTENT_PARAM = 2; public const int CMSG_BARE_CONTENT_PARAM = 3; public const int CMSG_INNER_CONTENT_TYPE_PARAM = 4; public const int CMSG_SIGNER_COUNT_PARAM = 5; public const int CMSG_SIGNER_INFO_PARAM = 6; public const int CMSG_SIGNER_CERT_INFO_PARAM = 7; public const int CMSG_SIGNER_HASH_ALGORITHM_PARAM = 8; public const int CMSG_SIGNER_AUTH_ATTR_PARAM = 9; public const int CMSG_SIGNER_UNAUTH_ATTR_PARAM = 10; public const int CMSG_CERT_COUNT_PARAM = 11; public const int CMSG_CERT_PARAM = 12; public const int CMSG_CRL_COUNT_PARAM = 13; public const int CMSG_CRL_PARAM = 14; public const int CMSG_ENVELOPE_ALGORITHM_PARAM = 15; public const int CMSG_RECIPIENT_COUNT_PARAM = 17; public const int CMSG_RECIPIENT_INDEX_PARAM = 18; public const int CMSG_RECIPIENT_INFO_PARAM = 19; public const int CMSG_HASH_ALGORITHM_PARAM = 20; public const int CMSG_HASH_DATA_PARAM = 21; public const int CMSG_COMPUTED_HASH_PARAM = 22; public const int CMSG_ENCRYPT_PARAM = 26; public const int CMSG_ENCRYPTED_DIGEST = 27; public const int CMSG_ENCODED_SIGNER = 28; public const int CMSG_ENCODED_MESSAGE = 29; public const int CMSG_VERSION_PARAM = 30; public const int CMSG_ATTR_CERT_COUNT_PARAM = 31; public const int CMSG_ATTR_CERT_PARAM = 32; public const int CMSG_CMS_RECIPIENT_COUNT_PARAM = 33; public const int CMSG_CMS_RECIPIENT_INDEX_PARAM = 34; public const int CMSG_CMS_RECIPIENT_ENCRYPTED_KEY_INDEX_PARAM = 35; public const int CMSG_CMS_RECIPIENT_INFO_PARAM = 36; public const int CMSG_UNPROTECTED_ATTR_PARAM = 37; public const int CMSG_SIGNER_CERT_ID_PARAM = 38; public const int CMSG_CMS_SIGNER_INFO_PARAM = 39; //------------------------------------------------------------------------- //dwObjectType for CryptQueryObject //------------------------------------------------------------------------- public const int CERT_QUERY_OBJECT_FILE = 0x00000001; public const int CERT_QUERY_OBJECT_BLOB = 0x00000002; //------------------------------------------------------------------------- //dwContentType for CryptQueryObject //------------------------------------------------------------------------- //encoded single certificate public const int CERT_QUERY_CONTENT_CERT = 1; //encoded single CTL public const int CERT_QUERY_CONTENT_CTL = 2; //encoded single CRL public const int CERT_QUERY_CONTENT_CRL = 3; //serialized store public const int CERT_QUERY_CONTENT_SERIALIZED_STORE = 4; //serialized single certificate public const int CERT_QUERY_CONTENT_SERIALIZED_CERT = 5; //serialized single CTL public const int CERT_QUERY_CONTENT_SERIALIZED_CTL = 6; //serialized single CRL public const int CERT_QUERY_CONTENT_SERIALIZED_CRL = 7; //a PKCS#7 signed message public const int CERT_QUERY_CONTENT_PKCS7_SIGNED = 8; //a PKCS#7 message, such as enveloped message. But it is not a signed message, public const int CERT_QUERY_CONTENT_PKCS7_UNSIGNED = 9; //a PKCS7 signed message embedded in a file public const int CERT_QUERY_CONTENT_PKCS7_SIGNED_EMBED = 10; //an encoded PKCS#10 public const int CERT_QUERY_CONTENT_PKCS10 = 11; //an encoded PKX BLOB public const int CERT_QUERY_CONTENT_PFX = 12; //an encoded CertificatePair (contains forward and/or reverse cross certs) public const int CERT_QUERY_CONTENT_CERT_PAIR = 13; //------------------------------------------------------------------------- //dwExpectedConentTypeFlags for CryptQueryObject //------------------------------------------------------------------------- //encoded single certificate public const int CERT_QUERY_CONTENT_FLAG_CERT = (1 << CERT_QUERY_CONTENT_CERT); //encoded single CTL public const int CERT_QUERY_CONTENT_FLAG_CTL = (1 << CERT_QUERY_CONTENT_CTL); //encoded single CRL public const int CERT_QUERY_CONTENT_FLAG_CRL = (1 << CERT_QUERY_CONTENT_CRL); //serialized store public const int CERT_QUERY_CONTENT_FLAG_SERIALIZED_STORE = (1 << CERT_QUERY_CONTENT_SERIALIZED_STORE); //serialized single certificate public const int CERT_QUERY_CONTENT_FLAG_SERIALIZED_CERT = (1 << CERT_QUERY_CONTENT_SERIALIZED_CERT); //serialized single CTL public const int CERT_QUERY_CONTENT_FLAG_SERIALIZED_CTL = (1 << CERT_QUERY_CONTENT_SERIALIZED_CTL); //serialized single CRL public const int CERT_QUERY_CONTENT_FLAG_SERIALIZED_CRL = (1 << CERT_QUERY_CONTENT_SERIALIZED_CRL); //an encoded PKCS#7 signed message public const int CERT_QUERY_CONTENT_FLAG_PKCS7_SIGNED = (1 << CERT_QUERY_CONTENT_PKCS7_SIGNED); //an encoded PKCS#7 message. But it is not a signed message public const int CERT_QUERY_CONTENT_FLAG_PKCS7_UNSIGNED = (1 << CERT_QUERY_CONTENT_PKCS7_UNSIGNED); //the content includes an embedded PKCS7 signed message public const int CERT_QUERY_CONTENT_FLAG_PKCS7_SIGNED_EMBED = (1 << CERT_QUERY_CONTENT_PKCS7_SIGNED_EMBED); //an encoded PKCS#10 public const int CERT_QUERY_CONTENT_FLAG_PKCS10 = (1 << CERT_QUERY_CONTENT_PKCS10); //an encoded PFX BLOB public const int CERT_QUERY_CONTENT_FLAG_PFX = (1 << CERT_QUERY_CONTENT_PFX); //an encoded CertificatePair (contains forward and/or reverse cross certs) public const int CERT_QUERY_CONTENT_FLAG_CERT_PAIR = (1 << CERT_QUERY_CONTENT_CERT_PAIR); //content can be any type public const int CERT_QUERY_CONTENT_FLAG_ALL = CERT_QUERY_CONTENT_FLAG_CERT | CERT_QUERY_CONTENT_FLAG_CTL | CERT_QUERY_CONTENT_FLAG_CRL | CERT_QUERY_CONTENT_FLAG_SERIALIZED_STORE | CERT_QUERY_CONTENT_FLAG_SERIALIZED_CERT | CERT_QUERY_CONTENT_FLAG_SERIALIZED_CTL | CERT_QUERY_CONTENT_FLAG_SERIALIZED_CRL | CERT_QUERY_CONTENT_FLAG_PKCS7_SIGNED | CERT_QUERY_CONTENT_FLAG_PKCS7_UNSIGNED | CERT_QUERY_CONTENT_FLAG_PKCS7_SIGNED_EMBED | CERT_QUERY_CONTENT_FLAG_PKCS10 | CERT_QUERY_CONTENT_FLAG_PFX | CERT_QUERY_CONTENT_FLAG_CERT_PAIR; //------------------------------------------------------------------------- //dwFormatType for CryptQueryObject //------------------------------------------------------------------------- //the content is in binary format public const int CERT_QUERY_FORMAT_BINARY = 1; //the content is base64 encoded public const int CERT_QUERY_FORMAT_BASE64_ENCODED = 2; //the content is ascii hex encoded with "{ASN}" prefix public const int CERT_QUERY_FORMAT_ASN_ASCII_HEX_ENCODED = 3; //------------------------------------------------------------------------- //dwExpectedFormatTypeFlags for CryptQueryObject //------------------------------------------------------------------------- //the content is in binary format public const int CERT_QUERY_FORMAT_FLAG_BINARY = (1 << CERT_QUERY_FORMAT_BINARY); //the content is base64 encoded public const int CERT_QUERY_FORMAT_FLAG_BASE64_ENCODED = (1 << CERT_QUERY_FORMAT_BASE64_ENCODED); //the content is ascii hex encoded with "{ASN}" prefix public const int CERT_QUERY_FORMAT_FLAG_ASN_ASCII_HEX_ENCODED = (1 << CERT_QUERY_FORMAT_ASN_ASCII_HEX_ENCODED); //the content can be of any format public const int CERT_QUERY_FORMAT_FLAG_ALL = CERT_QUERY_FORMAT_FLAG_BINARY | CERT_QUERY_FORMAT_FLAG_BASE64_ENCODED | CERT_QUERY_FORMAT_FLAG_ASN_ASCII_HEX_ENCODED; } } 

Answer 2

感谢你们，

你帮了我很多:)

顺便说一句：我找到了更简单的方法来获取时间戳。

这里是：

 foreach (var signerInfo in signedCms.SignerInfos) { foreach (var unsignedAttribute in signerInfo.UnsignedAttributes) { if (unsignedAttribute.Oid.Value == WinCrypt.szOID_RSA_counterSign) { foreach (var counterSignInfo in signerInfo.CounterSignerInfos) { foreach (var signedAttribute in counterSignInfo.SignedAttributes) { if (signedAttribute.Oid.Value == WinCrypt.szOID_RSA_signingTime) { Pkcs9SigningTime signingTime = (Pkcs9SigningTime)signedAttribute.Values[0]; Console.Out.WriteLine("Signing Time UTC: " + signingTime.SigningTime); } } } return true; } } } 

Answer 3

感谢OP为您的工作。 我添加了实现来获取证书的实际TimeStamp。

 foreach (var signerInfo in signedCms.SignerInfos) { foreach (var unsignedAttribute in signerInfo.UnsignedAttributes) { if (unsignedAttribute.Oid.Value == WinCrypt.szOID_RSA_counterSign) { foreach (var counterSignInfo in signerInfo.CounterSignerInfos) { foreach (var signedAttribute in counterSignInfo.SignedAttributes) { if (signedAttribute.Oid.Value == WinCrypt.szOID_RSA_signingTime) { System.Runtime.InteropServices.ComTypes.FILETIME fileTime = new System.Runtime.InteropServices.ComTypes.FILETIME(); int fileTimeSize = Marshal.SizeOf(fileTime); IntPtr fileTimePtr = Marshal.AllocCoTaskMem(fileTimeSize); Marshal.StructureToPtr(fileTime, fileTimePtr, true); byte[] buffdata = new byte[fileTimeSize]; Marshal.Copy(fileTimePtr, buffdata, 0, fileTimeSize); uint buffSize = (uint)buffdata.Length; uint encoding = WinCrypt.X509_ASN_ENCODING | WinCrypt.PKCS_7_ASN_ENCODING; UIntPtr rsaSigningTime = (UIntPtr)(uint)Marshal.StringToHGlobalAnsi(WinCrypt.szOID_RSA_signingTime); byte[] pbData = signedAttribute.Values[0].RawData; uint ucbData = (uint)pbData.Length; bool workie = WinCrypt.CryptDecodeObject(encoding, rsaSigningTime.ToUInt32(), pbData, ucbData, 0, buffdata, ref buffSize); if (workie) { IntPtr fileTimePtr2 = Marshal.AllocCoTaskMem(buffdata.Length); Marshal.Copy(buffdata, 0, fileTimePtr2, buffdata.Length); System.Runtime.InteropServices.ComTypes.FILETIME fileTime2 = (System.Runtime.InteropServices.ComTypes.FILETIME)Marshal.PtrToStructure(fileTimePtr2, typeof(System.Runtime.InteropServices.ComTypes.FILETIME)); long hFT2 = (((long)fileTime2.dwHighDateTime) << 32) + ((uint)fileTime2.dwLowDateTime); DateTime dte = DateTime.FromFileTime(hFT2); Console.WriteLine(dte.ToString()); } else { throw new Win32Exception(Marshal.GetLastWin32Error()); } } } } return true; } } } 

Answer 4

我想让主题脱离数字证书，它的OU类型字符串就像

• CN = Microsoft Corporation，OU = MOPR，O = Microsoft Corporation，L = Redmond，S = Washington，C = US

我发现X509Certificate非常慢，并将整个文件加载到内存中。 我试着读取一个800Mb的补丁文件，读取时我的内存增加了800Mb，耗时超过30秒！

我站在上面的海报的sholders设法调整上面的代码，以获得X509Certificate2对象比使用X509对象快数百倍。

请阅读我的博客文章，了解有关性能差异图像的更多详细信息。 X509Certificate对象c＃性能和内存问题替代 – 修复

试试这个：

 public static X509Certificate2 GetDigitalCertificate(string filename) { X509Certificate2 cert = null; int encodingType; int contentType; int formatType; IntPtr certStore = IntPtr.Zero; IntPtr cryptMsg = IntPtr.Zero; IntPtr context = IntPtr.Zero; if (!WinCrypt.CryptQueryObject( WinCrypt.CERT_QUERY_OBJECT_FILE, Marshal.StringToHGlobalUni(filename), (WinCrypt.CERT_QUERY_CONTENT_FLAG_PKCS7_SIGNED | WinCrypt.CERT_QUERY_CONTENT_FLAG_PKCS7_UNSIGNED | WinCrypt.CERT_QUERY_CONTENT_FLAG_PKCS7_SIGNED_EMBED), // <-- These are the attributes that makes it fast!! WinCrypt.CERT_QUERY_FORMAT_FLAG_ALL, 0, out encodingType, out contentType, out formatType, ref certStore, ref cryptMsg, ref context)) { throw new Win32Exception(Marshal.GetLastWin32Error()); } // Get size of the encoded message. int cbData = 0; if (!WinCrypt.CryptMsgGetParam( cryptMsg, WinCrypt.CMSG_ENCODED_MESSAGE, 0, IntPtr.Zero, ref cbData)) { throw new Win32Exception(Marshal.GetLastWin32Error()); } var vData = new byte[cbData]; // Get the encoded message. if (!WinCrypt.CryptMsgGetParam( cryptMsg, WinCrypt.CMSG_ENCODED_MESSAGE, 0, vData, ref cbData)) { throw new Win32Exception(Marshal.GetLastWin32Error()); } var signedCms = new SignedCms(); signedCms.Decode(vData); if (signedCms.SignerInfos.Count > 0) { var signerInfo = signedCms.SignerInfos[0]; if (signerInfo.Certificate != null) { cert = signerInfo.Certificate; } } return cert; } 

似乎如果你在CryptQueryObject调用上使用“WinCrypt.CERT_QUERY_CONTENT_FLAG_ALL”它会遭受与X509Certificate对象相同的内存性能损失，但是如果你将其修剪为仅仅PKCS7内容类型它就像一个梦想并且似乎给出了我需要的信息。

Answer 5

正如我看到你无论如何都没有回复，让我提供一个。

如果您不介意使用第三方组件，请查看我们的SecureBlackbox产品的TElAuthenticodeVerifier组件。 使用此组件，您可以validation签名并检查时间戳。

Answer 6

我喜欢通过使用SignedCms类来避免一些令人讨厌的p / invoke代码的想法，但要注意在某些网络情况下SignedCms构造函数可以阻塞很长时间 – 我在测试中看到大约15秒我’我正在运行。 Alejandro Campos Magencio在他的MSDN博客上有一些关于这个的信息，标题为Big delay，同时调用EnvelopedCms构造函数 。