C#

public static class WinCrypt32
        {
            #region APIs

            [DllImport("CRYPT32.DLL", EntryPoint = "CryptQueryObject", CharSet = CharSet.Auto, SetLastError = true)]
            public static extern Boolean CryptQueryObject(
                Int32 dwObjectType,
                IntPtr pvObject,
                Int32 dwExpectedContentTypeFlags,
                Int32 dwExpectedFormatTypeFlags,
                Int32 dwFlags,
                IntPtr pdwMsgAndCertEncodingType,
                IntPtr pdwContentType,
                IntPtr pdwFormatType,
                ref IntPtr phCertStore,
                IntPtr phMsg,
                ref IntPtr ppvContext
                );

            [DllImport("CRYPT32.DLL", EntryPoint = "CertFreeCRLContext", SetLastError = true)]
            public static extern Boolean CertFreeCRLContext(
                IntPtr pCrlContext
            );

            [DllImport("CRYPT32.DLL", EntryPoint = "CertNameToStr", CharSet = CharSet.Auto, SetLastError = true)]
            public static extern Int32 CertNameToStr(
                Int32 dwCertEncodingType,
                ref CRYPTOAPI_BLOB pName,
                Int32 dwStrType,
                StringBuilder psz,
                Int32 csz
            );

            [DllImport("CRYPT32.DLL", EntryPoint = "CertFindExtension", CharSet = CharSet.Auto, SetLastError = true)]
            public static extern IntPtr CertFindExtension(
                [MarshalAs(UnmanagedType.LPStr)]String pszObjId,
                Int32 cExtensions,
                IntPtr rgExtensions
            );

            [DllImport("CRYPT32.DLL", EntryPoint = "CryptFormatObject", CharSet = CharSet.Auto, SetLastError = true)]
            public static extern Boolean CryptFormatObject(
                Int32 dwCertEncodingType,
                Int32 dwFormatType,
                Int32 dwFormatStrType,
                IntPtr pFormatStruct,
                [MarshalAs(UnmanagedType.LPStr)]String lpszStructType,
                IntPtr pbEncoded,
                Int32 cbEncoded,
                StringBuilder pbFormat,
                ref Int32 pcbFormat
            );

            #endregion APIs

            #region Structs
            [StructLayout(LayoutKind.Sequential)]
            public struct CRYPT_OBJID_BLOB
            {
                public uint cbData;
                [MarshalAs(UnmanagedType.LPArray, SizeParamIndex = 0)]
                public byte[] pbData;
            }

            [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
            public struct CERT_PUBLIC_KEY_INFO
            {
                public CRYPT_ALGORITHM_IDENTIFIER Algorithm;
                public CRYPTOAPI_BLOB PublicKey;
            }

            [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
            public struct CERT_EXTENSION
            {
                [MarshalAs(UnmanagedType.LPStr)]
                public string pszObjId;
                public bool fCritical;
                public CRYPTOAPI_BLOB Value;
            }

            [StructLayout(LayoutKind.Sequential)]
            public struct CERT_CONTEXT
            {
                public uint dwCertEncodingType;
                public IntPtr pbCertEncoded;
                public uint cbCertEncoded;
                public IntPtr pCertInfo;
                public IntPtr hCertStore;
            }

            public struct CERT_INFO
            {
                public int dwVersion;
                public CRYPTOAPI_BLOB SerialNumber;
                public CRYPT_ALGORITHM_IDENTIFIER SignatureAlgorithm;
                public CRYPTOAPI_BLOB Issuer;
                public FILETIME NotBefore;
                public FILETIME NotAfter;
                public CRYPTOAPI_BLOB Subject;
                public CERT_PUBLIC_KEY_INFO SubjectPublicKeyInfo;
                public CRYPTOAPI_BLOB IssuerUniqueId;
                public CRYPTOAPI_BLOB SubjectUniqueId;
                public int cExtension;
                public CERT_EXTENSION rgExtension;
            }

            [StructLayout(LayoutKind.Sequential)]
            public struct CRL_CONTEXT
            {
                public Int32 dwCertEncodingType;
                public IntPtr pbCrlEncoded;
                public Int32 cbCrlEncoded;
                public IntPtr pCrlInfo;
                public IntPtr hCertStore;
            }

            [StructLayout(LayoutKind.Sequential)]
            public struct CRL_INFO
            {
                public Int32 dwVersion;
                public CRYPT_ALGORITHM_IDENTIFIER SignatureAlgorithm;
                public CRYPTOAPI_BLOB Issuer;
                public FILETIME ThisUpdate;
                public FILETIME NextUpdate;
                public Int32 cCRLEntry;
                public IntPtr rgCRLEntry;
                public Int32 cExtension;
                public IntPtr rgExtension;
            }

            [StructLayout(LayoutKind.Sequential)]
            public struct CRYPT_ALGORITHM_IDENTIFIER
            {
                [MarshalAs(UnmanagedType.LPStr)]
                public String pszObjId;
                public CRYPTOAPI_BLOB Parameters;
            }

            [StructLayout(LayoutKind.Sequential)]
            public struct CRYPTOAPI_BLOB
            {
                public Int32 cbData;
                public IntPtr pbData;
            }

            [StructLayout(LayoutKind.Sequential)]
            public struct FILETIME
            {
                public Int32 dwLowDateTime;
                public Int32 dwHighDateTime;
            }

            [StructLayout(LayoutKind.Sequential)]
            public struct CRL_ENTRY
            {
                public CRYPTOAPI_BLOB SerialNumber;
                public FILETIME RevocationDate;
                public Int32 cExtension;
                public IntPtr rgExtension;
            }

            #endregion Structs

            #region Consts

            public const Int32 CERT_QUERY_OBJECT_FILE = 0x00000001;
            public const Int32 CERT_QUERY_OBJECT_BLOB = 0x00000002;
            public const Int32 CERT_QUERY_CONTENT_CRL = 3;
            public const Int32 CERT_QUERY_CONTENT_FLAG_CRL = 1 << CERT_QUERY_CONTENT_CRL;
            public const Int32 CERT_QUERY_FORMAT_BINARY = 1;
            public const Int32 CERT_QUERY_FORMAT_BASE64_ENCODED = 2;
            public const Int32 CERT_QUERY_FORMAT_ASN_ASCII_HEX_ENCODED = 3;
            public const Int32 CERT_QUERY_FORMAT_FLAG_BINARY = 1 << CERT_QUERY_FORMAT_BINARY;
            public const Int32 CERT_QUERY_FORMAT_FLAG_BASE64_ENCODED = 1 << CERT_QUERY_FORMAT_BASE64_ENCODED;
            public const Int32 CERT_QUERY_FORMAT_FLAG_ASN_ASCII_HEX_ENCODED = 1 << CERT_QUERY_FORMAT_ASN_ASCII_HEX_ENCODED;
            public const Int32 CERT_QUERY_FORMAT_FLAG_ALL = CERT_QUERY_FORMAT_FLAG_BINARY | CERT_QUERY_FORMAT_FLAG_BASE64_ENCODED | CERT_QUERY_FORMAT_FLAG_ASN_ASCII_HEX_ENCODED;

            public const Int32 X509_ASN_ENCODING = 0x00000001;
            public const Int32 PKCS_7_ASN_ENCODING = 0x00010000;

            public const Int32 X509_NAME = 7;

            public const Int32 CERT_SIMPLE_NAME_STR = 1;
            public const Int32 CERT_OID_NAME_STR = 2;
            public const Int32 CERT_X500_NAME_STR = 3;

            public const String szOID_CRL_REASON_CODE = "2.5.29.21";

            public enum Disposition : uint
            {
                CERT_STORE_ADD_NEW = 1,
                CERT_STORE_ADD_USE_EXISTING = 2,
                CERT_STORE_ADD_REPLACE_EXISTING = 3,
                CERT_STORE_ADD_ALWAYS = 4,
                CERT_STORE_ADD_REPLACE_EXISTING_INHERIT_PROPERTIES = 5,
                CERT_STORE_ADD_NEWER = 6,
                CERT_STORE_ADD_NEWER_INHERIT_PROPERTIES = 7,
            }

            [Flags]
            public enum FindFlags : int
            {
                CRL_FIND_ISSUED_BY_AKI_FLAG = 0x1,
                CRL_FIND_ISSUED_BY_SIGNATURE_FLAG = 0x2,
                CRL_FIND_ISSUED_BY_DELTA_FLAG = 0x4,
                CRL_FIND_ISSUED_BY_BASE_FLAG = 0x8,
            }

            public enum FindType : int
            {
                CRL_FIND_ANY = 0,
                CRL_FIND_ISSUED_BY = 1,
                CRL_FIND_EXISTING = 2,
                CRL_FIND_ISSUED_FOR = 3
            }

            #endregion
        }