public byte[] VerifyAux(byte[] pSignature)
    {
        byte[] message = new byte[0];
        IntPtr pdecoded = IntPtr.Zero;
        IntPtr pverinfo = IntPtr.Zero;
        IntPtr pcrpara = IntPtr.Zero;
        IntPtr pdata1 = IntPtr.Zero;
        int cbDecoded = pSignature.Length;
        try
        {
            CRYPT_VERIFY_MESSAGE_PARA crpara = new CRYPT_VERIFY_MESSAGE_PARA();
            crpara.cbSize = (uint)Marshal.SizeOf(crpara);
            crpara.dwMsgAndCertEncodingType = (uint)65537;
            crpara.hCryptProv = IntPtr.Zero;
            crpara.pfnGetSignerCertificate = IntPtr.Zero;
            crpara.pvGetArg = IntPtr.Zero;

            CADES_VERIFY_MESSAGE_PARA verpara = new CADES_VERIFY_MESSAGE_PARA();
            verpara.dwSize = (uint)Marshal.SizeOf(verpara);
            pcrpara = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(CRYPT_VERIFY_MESSAGE_PARA)));
            Marshal.StructureToPtr(crpara, pcrpara, false);
            verpara.pVerifyMessagePara = pcrpara;
            verpara.pCadesVerifyPara = IntPtr.Zero;

            CRYPTOAPI_BLOB decoded = new CRYPTOAPI_BLOB();
            CADES_VERIFICATION_INFO verinfo = new CADES_VERIFICATION_INFO();
            pdecoded = IntPtr.Zero;
            pverinfo = IntPtr.Zero;
 
            pdata1 = Marshal.AllocHGlobal(sizeof(byte) * pSignature.Length);
            Marshal.Copy(pSignature, 0, pdata1, pSignature.Length);
            if (Crypto.CadesVerifyMessage(ref verpara, 0, pdata1, (uint)cbDecoded, out pdecoded, out pverinfo)) ///!!!
            {
                decoded = (CRYPTOAPI_BLOB)Marshal.PtrToStructure(pdecoded, typeof(CRYPTOAPI_BLOB));
                verinfo = (CADES_VERIFICATION_INFO)Marshal.PtrToStructure(pverinfo, typeof(CADES_VERIFICATION_INFO));
                message = new byte[decoded.cbData];
                Marshal.Copy(decoded.pbData, message, 0, (int)decoded.cbData);
            }
            else
            {
                verinfo = (CADES_VERIFICATION_INFO)Marshal.PtrToStructure(pverinfo, typeof(CADES_VERIFICATION_INFO));
                Context.Items["LastError"] = (int)verinfo.dwStatus;
                throw new Exception("Некорректная подпись!");
            }
        }
        finally
        {
            Marshal.FreeHGlobal(pdata1);
            Marshal.FreeHGlobal(pcrpara);
            Crypto.CadesFreeBlob(pdecoded);
            Crypto.CadesFreeVerificationInfo(pverinfo);
        }

        return message;
    }