Using P/Invoke to find Certificates with specific Enhanced Key Usa

[Charles Denny]

I'm trying to call CertFindCertifi cateInStore to find all certificates in the
store that have the Code Signing enhanced key usage. I'm running into
problems marshalling the array of OIDs in _CTL_USAGE. I keep getting a "This
type can not be marshalled as a structure field."

Does anyone have any ideas as to what I'm doing wrong? Here's the code:

namespace CertSignTest
{
using System;
using System.Diagnost ics;
using System.Text;
using System.Runtime. InteropServices ;
using System.Security .Cryptography.X 509Certificates ;
using System.Componen tModel;

public class WinCapi
{

/*
HCERTSTORE WINAPI CertOpenSystemS tore(HCRYPTPROV hprov, LPTCSTR
szSubsystemProt ocol);
BOOL WINAPI CertCloseStore( HCERTSTORE hCertStore, DWORD dwFlags);

PCCERT_CONTEXT WINAPI CertFindCertifi cateInStore(
HCERTSTORE hCertStore,
DWORD dwCertEncodingT ype,
DWORD dwFindFlags,
DWORD dwFindType,
const void* pvFindPara,
PCCERT_CONTEXT pPrevCertContex t);

BOOL WINAPI CertFreeCertifi cateContext(
PCCERT_CONTEXT pCertContext
);

typedef struct _CTL_USAGE {
DWORD cUsageIdentifie r;
LPSTR *rgpszUsageIden tifier; // array of pszObjId
} CTL_USAGE, *PCTL_USAGE, CERT_ENHKEY_USA GE, *PCERT_ENHKEY_U SAGE;

*/
[StructLayout(La youtKind.Sequen tial, CharSet=CharSet .Auto)]
public struct CRYPT_OID_INFO
{
public uint cbSize;
[MarshalAs(Unman agedType.LPStr)] public String pszOID;
[MarshalAs(Unman agedType.LPWStr )]public String pwszName;
public uint dwGroupID;
public uint dwValue;
public int cbData; //ExtraInfo blob
public IntPtr pbData;
}

[StructLayout(La youtKind.Sequen tial, CharSet=CharSet .Auto)]
public struct _CTL_USAGE
{
public int cUsageIdentifie r;
[MarshalAs(Unman agedType.ByValA rray)]
public string[] rgpszUseageIden tifier;
}

[DllImport("cryp t32.dll", CharSet=CharSet .Auto, SetLastError=tr ue)]
public static extern IntPtr CertOpenSystemS tore(
IntPtr hCryptProv,
string storename) ;

[DllImport("cryp t32.dll", SetLastError=tr ue)]
public static extern bool CertCloseStore(
IntPtr hCertStore,
uint dwFlags) ;

[DllImport("cryp t32.dll", SetLastError=tr ue)]
public static extern IntPtr CertFindCertifi cateInStore(
IntPtr hCertStore,
uint dwCertEncodingT ype,
uint dwFindFlags,
uint dwFindType,
ref WinCapi._CTL_US AGE pvFindPara,
IntPtr pPrevCertCntxt) ;
[DllImport("cryp t32.dll", SetLastError=tr ue)]
public static extern bool CertFreeCertifi cateContext(
IntPtr hCertStore) ;

}

public class SimpleCert
{
const string szOID_PKIX_KP_C ODE_SIGNING = "1.3.6.1.5.5.7. 3.3";
const string MY = "MY";
const string OTHERS = "AddressBoo k";
const uint PKCS_7_ASN_ENCO DING = 0x00010000;
const uint X509_ASN_ENCODI NG = 0x00000001;
const uint CERT_FIND_SUBJE CT_STR = 0x00080007;
const uint CERT_FIND_ENHKE Y_USAGE = 0x000A0000;

static uint MY_ENCODING_TYP E = PKCS_7_ASN_ENCO DING | X509_ASN_ENCODI NG ;

public static void Main()
{
IntPtr hSysStore = IntPtr.Zero;
IntPtr hCertCntxt = IntPtr.Zero;
IntPtr hStructure = IntPtr.Zero;

WinCapi._CTL_US AGE test = new WinCapi._CTL_US AGE();

string[] strTest = new string[1];
strTest[0] = szOID_PKIX_KP_C ODE_SIGNING;

hSysStore = WinCapi.CertOpe nSystemStore(In tPtr.Zero, MY) ;
Console.WriteLi ne("Store Handle:\t0x{0:X }", hSysStore.ToInt 32());

test.cUsageIden tifier = 1;
test.rgpszUseag eIdentifier = new string[1];
test.rgpszUseag eIdentifier[0] = szOID_PKIX_KP_C ODE_SIGNING;
if(hSysStore != IntPtr.Zero)
{
hCertCntxt=WinC api.CertFindCer tificateInStore (
hSysStore,
MY_ENCODING_TYP E,
0,
CERT_FIND_ENHKE Y_USAGE,
ref test,
IntPtr.Zero) ;

Debug.WriteLine (Marshal.GetLas tWin32Error().T oString());

while(hCertCntx t != IntPtr.Zero)
{
Console.WriteLi ne("CertContext :\t0x{0:X}", hCertCntxt.ToIn t32()) ;
X509Certificate foundcert = new X509Certificate (hCertCntxt);
Console.WriteLi ne("\nFound certificate with SubjectName string
\"{0}\"",lpszCe rtSubject);
Console.WriteLi ne("SubjectName :\t{0}", foundcert.GetNa me());
Console.WriteLi ne("Serial No:\t{0}", foundcert.GetSe rialNumberStrin g());
Console.WriteLi ne("HashString: \t{0}" , foundcert.GetCe rtHashString()) ;
Console.WriteLi ne("PublicKey:\ t{0}",foundcert .GetPublicKey() .ToString());
Console.WriteLi ne("Issuer:\t {0}",foundcert. GetIssuerName() );

hCertCntxt=WinC api.CertFindCer tificateInStore (
hSysStore,
MY_ENCODING_TYP E,
0,
CERT_FIND_ENHKE Y_USAGE,
ref test,
hCertCntxt) ;
}
}

//------- Clean Up -----------
if(hCertCntxt != IntPtr.Zero)
WinCapi.CertFre eCertificateCon text(hCertCntxt );
if(hSysStore != IntPtr.Zero)
WinCapi.CertClo seStore(hSysSto re, 0) ;
}

}

[Ollie Riches]

Have you been to pinvoke.net they have an example for exactly what you are
trying to do:

http://pinvoke.net/default.aspx/cryp...ificateInStore

In fact it is the best place for an interop related API issues IMHO.

HTH

Ollie Riches

"Charles Denny" <Ch**********@d iscussions.micr osoft.com> wrote in message
news:6C******** *************** ***********@mic rosoft.com...

I'm trying to call CertFindCertifi cateInStore to find all certificates in
the
store that have the Code Signing enhanced key usage. I'm running into
problems marshalling the array of OIDs in _CTL_USAGE. I keep getting a
"This
type can not be marshalled as a structure field."

Does anyone have any ideas as to what I'm doing wrong? Here's the code:

namespace CertSignTest
{
using System;
using System.Diagnost ics;
using System.Text;
using System.Runtime. InteropServices ;
using System.Security .Cryptography.X 509Certificates ;
using System.Componen tModel;

public class WinCapi
{

/*
HCERTSTORE WINAPI CertOpenSystemS tore(HCRYPTPROV hprov, LPTCSTR
szSubsystemProt ocol);
BOOL WINAPI CertCloseStore( HCERTSTORE hCertStore, DWORD dwFlags);

PCCERT_CONTEXT WINAPI CertFindCertifi cateInStore(
HCERTSTORE hCertStore,
DWORD dwCertEncodingT ype,
DWORD dwFindFlags,
DWORD dwFindType,
const void* pvFindPara,
PCCERT_CONTEXT pPrevCertContex t);

BOOL WINAPI CertFreeCertifi cateContext(
PCCERT_CONTEXT pCertContext
);

typedef struct _CTL_USAGE {
DWORD cUsageIdentifie r;
LPSTR *rgpszUsageIden tifier; // array of pszObjId
} CTL_USAGE, *PCTL_USAGE, CERT_ENHKEY_USA GE, *PCERT_ENHKEY_U SAGE;

*/
[StructLayout(La youtKind.Sequen tial, CharSet=CharSet .Auto)]
public struct CRYPT_OID_INFO
{
public uint cbSize;
[MarshalAs(Unman agedType.LPStr)] public String pszOID;
[MarshalAs(Unman agedType.LPWStr )]public String pwszName;
public uint dwGroupID;
public uint dwValue;
public int cbData; //ExtraInfo blob
public IntPtr pbData;
}

[StructLayout(La youtKind.Sequen tial, CharSet=CharSet .Auto)]
public struct _CTL_USAGE
{
public int cUsageIdentifie r;
[MarshalAs(Unman agedType.ByValA rray)]
public string[] rgpszUseageIden tifier;
}

[DllImport("cryp t32.dll", CharSet=CharSet .Auto, SetLastError=tr ue)]
public static extern IntPtr CertOpenSystemS tore(
IntPtr hCryptProv,
string storename) ;

[DllImport("cryp t32.dll", SetLastError=tr ue)]
public static extern bool CertCloseStore(
IntPtr hCertStore,
uint dwFlags) ;

[DllImport("cryp t32.dll", SetLastError=tr ue)]
public static extern IntPtr CertFindCertifi cateInStore(
IntPtr hCertStore,
uint dwCertEncodingT ype,
uint dwFindFlags,
uint dwFindType,
ref WinCapi._CTL_US AGE pvFindPara,
IntPtr pPrevCertCntxt) ;
[DllImport("cryp t32.dll", SetLastError=tr ue)]
public static extern bool CertFreeCertifi cateContext(
IntPtr hCertStore) ;

}

public class SimpleCert
{
const string szOID_PKIX_KP_C ODE_SIGNING = "1.3.6.1.5.5.7. 3.3";
const string MY = "MY";
const string OTHERS = "AddressBoo k";
const uint PKCS_7_ASN_ENCO DING = 0x00010000;
const uint X509_ASN_ENCODI NG = 0x00000001;
const uint CERT_FIND_SUBJE CT_STR = 0x00080007;
const uint CERT_FIND_ENHKE Y_USAGE = 0x000A0000;

static uint MY_ENCODING_TYP E = PKCS_7_ASN_ENCO DING | X509_ASN_ENCODI NG
;

public static void Main()
{
IntPtr hSysStore = IntPtr.Zero;
IntPtr hCertCntxt = IntPtr.Zero;
IntPtr hStructure = IntPtr.Zero;

WinCapi._CTL_US AGE test = new WinCapi._CTL_US AGE();

string[] strTest = new string[1];
strTest[0] = szOID_PKIX_KP_C ODE_SIGNING;

hSysStore = WinCapi.CertOpe nSystemStore(In tPtr.Zero, MY) ;
Console.WriteLi ne("Store Handle:\t0x{0:X }", hSysStore.ToInt 32());

test.cUsageIden tifier = 1;
test.rgpszUseag eIdentifier = new string[1];
test.rgpszUseag eIdentifier[0] = szOID_PKIX_KP_C ODE_SIGNING;
if(hSysStore != IntPtr.Zero)
{
hCertCntxt=WinC api.CertFindCer tificateInStore (
hSysStore,
MY_ENCODING_TYP E,
0,
CERT_FIND_ENHKE Y_USAGE,
ref test,
IntPtr.Zero) ;

Debug.WriteLine (Marshal.GetLas tWin32Error().T oString());

while(hCertCntx t != IntPtr.Zero)
{
Console.WriteLi ne("CertContext :\t0x{0:X}", hCertCntxt.ToIn t32()) ;
X509Certificate foundcert = new X509Certificate (hCertCntxt);
Console.WriteLi ne("\nFound certificate with SubjectName string
\"{0}\"",lpszCe rtSubject);
Console.WriteLi ne("SubjectName :\t{0}", foundcert.GetNa me());
Console.WriteLi ne("Serial No:\t{0}", foundcert.GetSe rialNumberStrin g());
Console.WriteLi ne("HashString: \t{0}" , foundcert.GetCe rtHashString()) ;
Console.WriteLi ne("PublicKey:\ t{0}",foundcert .GetPublicKey() .ToString());
Console.WriteLi ne("Issuer:\t {0}",foundcert. GetIssuerName() );

hCertCntxt=WinC api.CertFindCer tificateInStore (
hSysStore,
MY_ENCODING_TYP E,
0,
CERT_FIND_ENHKE Y_USAGE,
ref test,
hCertCntxt) ;
}
}

//------- Clean Up -----------
if(hCertCntxt != IntPtr.Zero)
WinCapi.CertFre eCertificateCon text(hCertCntxt );
if(hSysStore != IntPtr.Zero)
WinCapi.CertClo seStore(hSysSto re, 0) ;
}

}

[Charles Denny]

Thanks Ollie, however that doesn't really help me as I'm having to pass the
CTL_USAGE structure to pzFindPara of the CertFindCertifi cateInStore. This
structure has an array of strings. I need to be able to successfully marshal
the CTL_USAGE structure so that I can search for Enhanced Key Usage OIDs
rather than the subject name that is given in the example.

The problem with the website you just gave me is that pszFindPara can be one
of a number of types, and they only have an example for one of those types.
:) I suppose if I could work out how to get a IntPtr assigned to the
structure, I could try just passing that.
Regards,
Charles
"Ollie Riches" wrote:

Have you been to pinvoke.net they have an example for exactly what you are
trying to do:

http://pinvoke.net/default.aspx/cryp...ificateInStore

In fact it is the best place for an interop related API issues IMHO.

HTH

Ollie Riches

"Charles Denny" <Ch**********@d iscussions.micr osoft.com> wrote in message
news:6C******** *************** ***********@mic rosoft.com...

I'm trying to call CertFindCertifi cateInStore to find all certificates in
the
store that have the Code Signing enhanced key usage. I'm running into
problems marshalling the array of OIDs in _CTL_USAGE. I keep getting a
"This
type can not be marshalled as a structure field."

Does anyone have any ideas as to what I'm doing wrong? Here's the code:

namespace CertSignTest
{
using System;
using System.Diagnost ics;
using System.Text;
using System.Runtime. InteropServices ;
using System.Security .Cryptography.X 509Certificates ;
using System.Componen tModel;

public class WinCapi
{

/*
HCERTSTORE WINAPI CertOpenSystemS tore(HCRYPTPROV hprov, LPTCSTR
szSubsystemProt ocol);
BOOL WINAPI CertCloseStore( HCERTSTORE hCertStore, DWORD dwFlags);

PCCERT_CONTEXT WINAPI CertFindCertifi cateInStore(
HCERTSTORE hCertStore,
DWORD dwCertEncodingT ype,
DWORD dwFindFlags,
DWORD dwFindType,
const void* pvFindPara,
PCCERT_CONTEXT pPrevCertContex t);

BOOL WINAPI CertFreeCertifi cateContext(
PCCERT_CONTEXT pCertContext
);

typedef struct _CTL_USAGE {
DWORD cUsageIdentifie r;
LPSTR *rgpszUsageIden tifier; // array of pszObjId
} CTL_USAGE, *PCTL_USAGE, CERT_ENHKEY_USA GE, *PCERT_ENHKEY_U SAGE;

*/
[StructLayout(La youtKind.Sequen tial, CharSet=CharSet .Auto)]
public struct CRYPT_OID_INFO
{
public uint cbSize;
[MarshalAs(Unman agedType.LPStr)] public String pszOID;
[MarshalAs(Unman agedType.LPWStr )]public String pwszName;
public uint dwGroupID;
public uint dwValue;
public int cbData; //ExtraInfo blob
public IntPtr pbData;
}

[StructLayout(La youtKind.Sequen tial, CharSet=CharSet .Auto)]
public struct _CTL_USAGE
{
public int cUsageIdentifie r;
[MarshalAs(Unman agedType.ByValA rray)]
public string[] rgpszUseageIden tifier;
}

[DllImport("cryp t32.dll", CharSet=CharSet .Auto, SetLastError=tr ue)]
public static extern IntPtr CertOpenSystemS tore(
IntPtr hCryptProv,
string storename) ;

[DllImport("cryp t32.dll", SetLastError=tr ue)]
public static extern bool CertCloseStore(
IntPtr hCertStore,
uint dwFlags) ;

[DllImport("cryp t32.dll", SetLastError=tr ue)]
public static extern IntPtr CertFindCertifi cateInStore(
IntPtr hCertStore,
uint dwCertEncodingT ype,
uint dwFindFlags,
uint dwFindType,
ref WinCapi._CTL_US AGE pvFindPara,
IntPtr pPrevCertCntxt) ;
[DllImport("cryp t32.dll", SetLastError=tr ue)]
public static extern bool CertFreeCertifi cateContext(
IntPtr hCertStore) ;

}

public class SimpleCert
{
const string szOID_PKIX_KP_C ODE_SIGNING = "1.3.6.1.5.5.7. 3.3";
const string MY = "MY";
const string OTHERS = "AddressBoo k";
const uint PKCS_7_ASN_ENCO DING = 0x00010000;
const uint X509_ASN_ENCODI NG = 0x00000001;
const uint CERT_FIND_SUBJE CT_STR = 0x00080007;
const uint CERT_FIND_ENHKE Y_USAGE = 0x000A0000;

static uint MY_ENCODING_TYP E = PKCS_7_ASN_ENCO DING | X509_ASN_ENCODI NG
;

public static void Main()
{
IntPtr hSysStore = IntPtr.Zero;
IntPtr hCertCntxt = IntPtr.Zero;
IntPtr hStructure = IntPtr.Zero;

WinCapi._CTL_US AGE test = new WinCapi._CTL_US AGE();

string[] strTest = new string[1];
strTest[0] = szOID_PKIX_KP_C ODE_SIGNING;

hSysStore = WinCapi.CertOpe nSystemStore(In tPtr.Zero, MY) ;
Console.WriteLi ne("Store Handle:\t0x{0:X }", hSysStore.ToInt 32());

test.cUsageIden tifier = 1;
test.rgpszUseag eIdentifier = new string[1];
test.rgpszUseag eIdentifier[0] = szOID_PKIX_KP_C ODE_SIGNING;
if(hSysStore != IntPtr.Zero)
{
hCertCntxt=WinC api.CertFindCer tificateInStore (
hSysStore,
MY_ENCODING_TYP E,
0,
CERT_FIND_ENHKE Y_USAGE,
ref test,
IntPtr.Zero) ;

Debug.WriteLine (Marshal.GetLas tWin32Error().T oString());

while(hCertCntx t != IntPtr.Zero)
{
Console.WriteLi ne("CertContext :\t0x{0:X}", hCertCntxt.ToIn t32()) ;
X509Certificate foundcert = new X509Certificate (hCertCntxt);
Console.WriteLi ne("\nFound certificate with SubjectName string
\"{0}\"",lpszCe rtSubject);
Console.WriteLi ne("SubjectName :\t{0}", foundcert.GetNa me());
Console.WriteLi ne("Serial No:\t{0}", foundcert.GetSe rialNumberStrin g());
Console.WriteLi ne("HashString: \t{0}" , foundcert.GetCe rtHashString()) ;
Console.WriteLi ne("PublicKey:\ t{0}",foundcert .GetPublicKey() .ToString());
Console.WriteLi ne("Issuer:\t {0}",foundcert. GetIssuerName() );

hCertCntxt=WinC api.CertFindCer tificateInStore (
hSysStore,
MY_ENCODING_TYP E,
0,
CERT_FIND_ENHKE Y_USAGE,
ref test,
hCertCntxt) ;
}
}

//------- Clean Up -----------
if(hCertCntxt != IntPtr.Zero)
WinCapi.CertFre eCertificateCon text(hCertCntxt );
if(hSysStore != IntPtr.Zero)
WinCapi.CertClo seStore(hSysSto re, 0) ;
}

}

[Ollie Riches]

Charles,

Have you read this page on MSDN:

http://msdn.microsoft.com/library/de...gForArrays.asp

HTH

Ollie Riches

"Charles Denny" <Ch**********@d iscussions.micr osoft.com> wrote in message
news:33******** *************** ***********@mic rosoft.com...

Thanks Ollie, however that doesn't really help me as I'm having to pass
the
CTL_USAGE structure to pzFindPara of the CertFindCertifi cateInStore. This
structure has an array of strings. I need to be able to successfully
marshal
the CTL_USAGE structure so that I can search for Enhanced Key Usage OIDs
rather than the subject name that is given in the example.

The problem with the website you just gave me is that pszFindPara can be
one
of a number of types, and they only have an example for one of those
types.
:) I suppose if I could work out how to get a IntPtr assigned to the
structure, I could try just passing that.
Regards,
Charles
"Ollie Riches" wrote:

Have you been to pinvoke.net they have an example for exactly what you
are
trying to do:

http://pinvoke.net/default.aspx/cryp...ificateInStore

In fact it is the best place for an interop related API issues IMHO.

HTH

Ollie Riches

"Charles Denny" <Ch**********@d iscussions.micr osoft.com> wrote in message
news:6C******** *************** ***********@mic rosoft.com...

> I'm trying to call CertFindCertifi cateInStore to find all certificates
> in
> the
> store that have the Code Signing enhanced key usage. I'm running into
> problems marshalling the array of OIDs in _CTL_USAGE. I keep getting a
> "This
> type can not be marshalled as a structure field."
>
> Does anyone have any ideas as to what I'm doing wrong? Here's the
> code:
>
> namespace CertSignTest
> {
> using System;
> using System.Diagnost ics;
> using System.Text;
> using System.Runtime. InteropServices ;
> using System.Security .Cryptography.X 509Certificates ;
> using System.Componen tModel;
>
> public class WinCapi
> {
>
> /*
> HCERTSTORE WINAPI CertOpenSystemS tore(HCRYPTPROV hprov, LPTCSTR
> szSubsystemProt ocol);
> BOOL WINAPI CertCloseStore( HCERTSTORE hCertStore, DWORD dwFlags);
>
> PCCERT_CONTEXT WINAPI CertFindCertifi cateInStore(
> HCERTSTORE hCertStore,
> DWORD dwCertEncodingT ype,
> DWORD dwFindFlags,
> DWORD dwFindType,
> const void* pvFindPara,
> PCCERT_CONTEXT pPrevCertContex t);
>
> BOOL WINAPI CertFreeCertifi cateContext(
> PCCERT_CONTEXT pCertContext
> );
>
> typedef struct _CTL_USAGE {
> DWORD cUsageIdentifie r;
> LPSTR *rgpszUsageIden tifier; // array of
> pszObjId
> } CTL_USAGE, *PCTL_USAGE, CERT_ENHKEY_USA GE, *PCERT_ENHKEY_U SAGE;
>
> */
>
>
> [StructLayout(La youtKind.Sequen tial, CharSet=CharSet .Auto)]
> public struct CRYPT_OID_INFO
> {
> public uint cbSize;
> [MarshalAs(Unman agedType.LPStr)] public String pszOID;
> [MarshalAs(Unman agedType.LPWStr )]public String pwszName;
> public uint dwGroupID;
> public uint dwValue;
> public int cbData; //ExtraInfo blob
> public IntPtr pbData;
> }
>
> [StructLayout(La youtKind.Sequen tial, CharSet=CharSet .Auto)]
> public struct _CTL_USAGE
> {
> public int cUsageIdentifie r;
> [MarshalAs(Unman agedType.ByValA rray)]
> public string[] rgpszUseageIden tifier;
> }
>
> [DllImport("cryp t32.dll", CharSet=CharSet .Auto, SetLastError=tr ue)]
> public static extern IntPtr CertOpenSystemS tore(
> IntPtr hCryptProv,
> string storename) ;
>
> [DllImport("cryp t32.dll", SetLastError=tr ue)]
> public static extern bool CertCloseStore(
> IntPtr hCertStore,
> uint dwFlags) ;
>
> [DllImport("cryp t32.dll", SetLastError=tr ue)]
> public static extern IntPtr CertFindCertifi cateInStore(
> IntPtr hCertStore,
> uint dwCertEncodingT ype,
> uint dwFindFlags,
> uint dwFindType,
> ref WinCapi._CTL_US AGE pvFindPara,
> IntPtr pPrevCertCntxt) ;
>
>
> [DllImport("cryp t32.dll", SetLastError=tr ue)]
> public static extern bool CertFreeCertifi cateContext(
> IntPtr hCertStore) ;
>
> }
>
> public class SimpleCert
> {
> const string szOID_PKIX_KP_C ODE_SIGNING = "1.3.6.1.5.5.7. 3.3";
> const string MY = "MY";
> const string OTHERS = "AddressBoo k";
> const uint PKCS_7_ASN_ENCO DING = 0x00010000;
> const uint X509_ASN_ENCODI NG = 0x00000001;
> const uint CERT_FIND_SUBJE CT_STR = 0x00080007;
> const uint CERT_FIND_ENHKE Y_USAGE = 0x000A0000;
>
> static uint MY_ENCODING_TYP E = PKCS_7_ASN_ENCO DING |
> X509_ASN_ENCODI NG
> ;
>
> public static void Main()
> {
> IntPtr hSysStore = IntPtr.Zero;
> IntPtr hCertCntxt = IntPtr.Zero;
> IntPtr hStructure = IntPtr.Zero;
>
> WinCapi._CTL_US AGE test = new WinCapi._CTL_US AGE();
>
> string[] strTest = new string[1];
> strTest[0] = szOID_PKIX_KP_C ODE_SIGNING;
>
> hSysStore = WinCapi.CertOpe nSystemStore(In tPtr.Zero, MY) ;
> Console.WriteLi ne("Store Handle:\t0x{0:X }", hSysStore.ToInt 32());
>
> test.cUsageIden tifier = 1;
> test.rgpszUseag eIdentifier = new string[1];
> test.rgpszUseag eIdentifier[0] = szOID_PKIX_KP_C ODE_SIGNING;
> if(hSysStore != IntPtr.Zero)
> {
> hCertCntxt=WinC api.CertFindCer tificateInStore (
> hSysStore,
> MY_ENCODING_TYP E,
> 0,
> CERT_FIND_ENHKE Y_USAGE,
> ref test,
> IntPtr.Zero) ;
>
> Debug.WriteLine (Marshal.GetLas tWin32Error().T oString());
>
> while(hCertCntx t != IntPtr.Zero)
> {
> Console.WriteLi ne("CertContext :\t0x{0:X}", hCertCntxt.ToIn t32()) ;
> X509Certificate foundcert = new X509Certificate (hCertCntxt);
> Console.WriteLi ne("\nFound certificate with SubjectName string
> \"{0}\"",lpszCe rtSubject);
> Console.WriteLi ne("SubjectName :\t{0}", foundcert.GetNa me());
> Console.WriteLi ne("Serial No:\t{0}",
> foundcert.GetSe rialNumberStrin g());
> Console.WriteLi ne("HashString: \t{0}" , foundcert.GetCe rtHashString()) ;
> Console.WriteLi ne("PublicKey:\ t{0}",foundcert .GetPublicKey() .ToString());
> Console.WriteLi ne("Issuer:\t {0}",foundcert. GetIssuerName() );
>
> hCertCntxt=WinC api.CertFindCer tificateInStore (
> hSysStore,
> MY_ENCODING_TYP E,
> 0,
> CERT_FIND_ENHKE Y_USAGE,
> ref test,
> hCertCntxt) ;
> }
> }
>
> //------- Clean Up -----------
> if(hCertCntxt != IntPtr.Zero)
> WinCapi.CertFre eCertificateCon text(hCertCntxt );
> if(hSysStore != IntPtr.Zero)
> WinCapi.CertClo seStore(hSysSto re, 0) ;
> }
>
> }