cryptnet_main.c

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/*
 * Copyright (C) 2006 Maarten Lankhorst
 * Copyright 2007 Juan Lang
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 *
 */

#include "config.h"
#include "wine/port.h"

#define NONAMELESSUNION
#define NONAMELESSSTRUCT
#define CERT_REVOCATION_PARA_HAS_EXTRA_FIELDS

#include <stdio.h>
#include <stdarg.h>

#include "windef.h"
#include "winbase.h"
#include "winnt.h"
#include "winnls.h"
#include "wininet.h"
#include "objbase.h"
#include "wincrypt.h"

#include "wine/debug.h"

WINE_DEFAULT_DEBUG_CHANNEL(cryptnet);

#define IS_INTOID(x)    (((ULONG_PTR)(x) >> 16) == 0)

BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
{
   TRACE("(0x%p, %d, %p)\n", hinstDLL, fdwReason, lpvReserved);

   switch (fdwReason) {
      case DLL_PROCESS_ATTACH:
         DisableThreadLibraryCalls(hinstDLL);
         break;
      case DLL_PROCESS_DETACH:
         /* Do uninitialisation here */
         break;
      default: break;
   }
   return TRUE;
}

static const WCHAR cryptNet[] = { 'c','r','y','p','t','n','e','t','.',
   'd','l','l',0 };

/***********************************************************************
 *    DllRegisterServer (CRYPTNET.@)
 */
HRESULT WINAPI DllRegisterServer(void)
{
   TRACE("\n");
   CryptRegisterDefaultOIDFunction(X509_ASN_ENCODING,
    CRYPT_OID_VERIFY_REVOCATION_FUNC, 0, cryptNet);
   CryptRegisterOIDFunction(0, CRYPT_OID_OPEN_STORE_PROV_FUNC, "Ldap",
    cryptNet, "LdapProvOpenStore");
   CryptRegisterOIDFunction(0, CRYPT_OID_OPEN_STORE_PROV_FUNC,
    CERT_STORE_PROV_LDAP_W, cryptNet, "LdapProvOpenStore");
   return S_OK;
}

/***********************************************************************
 *    DllUnregisterServer (CRYPTNET.@)
 */
HRESULT WINAPI DllUnregisterServer(void)
{
   TRACE("\n");
   CryptUnregisterDefaultOIDFunction(X509_ASN_ENCODING,
    CRYPT_OID_VERIFY_REVOCATION_FUNC, cryptNet);
   CryptUnregisterOIDFunction(0, CRYPT_OID_OPEN_STORE_PROV_FUNC, "Ldap");
   CryptUnregisterOIDFunction(0, CRYPT_OID_OPEN_STORE_PROV_FUNC,
    CERT_STORE_PROV_LDAP_W);
   return S_OK;
}

static const char *url_oid_to_str(LPCSTR oid)
{
    if (IS_INTOID(oid))
    {
        static char buf[10];

        switch (LOWORD(oid))
        {
#define _x(oid) case LOWORD(oid): return #oid
        _x(URL_OID_CERTIFICATE_ISSUER);
        _x(URL_OID_CERTIFICATE_CRL_DIST_POINT);
        _x(URL_OID_CTL_ISSUER);
        _x(URL_OID_CTL_NEXT_UPDATE);
        _x(URL_OID_CRL_ISSUER);
        _x(URL_OID_CERTIFICATE_FRESHEST_CRL);
        _x(URL_OID_CRL_FRESHEST_CRL);
        _x(URL_OID_CROSS_CERT_DIST_POINT);
#undef _x
        default:
            snprintf(buf, sizeof(buf), "%d", LOWORD(oid));
            return buf;
        }
    }
    else
        return oid;
}

typedef BOOL (WINAPI *UrlDllGetObjectUrlFunc)(LPCSTR, LPVOID, DWORD,
 PCRYPT_URL_ARRAY, DWORD *, PCRYPT_URL_INFO, DWORD *, LPVOID);

static BOOL WINAPI CRYPT_GetUrlFromCertificateIssuer(LPCSTR pszUrlOid,
 LPVOID pvPara, DWORD dwFlags, PCRYPT_URL_ARRAY pUrlArray, DWORD *pcbUrlArray,
 PCRYPT_URL_INFO pUrlInfo, DWORD *pcbUrlInfo, LPVOID pvReserved)
{
    PCCERT_CONTEXT cert = pvPara;
    PCERT_EXTENSION ext;
    BOOL ret = FALSE;

    /* The only applicable flag is CRYPT_GET_URL_FROM_EXTENSION */
    if (dwFlags && !(dwFlags & CRYPT_GET_URL_FROM_EXTENSION))
    {
        SetLastError(CRYPT_E_NOT_FOUND);
        return FALSE;
    }
    if ((ext = CertFindExtension(szOID_AUTHORITY_INFO_ACCESS,
     cert->pCertInfo->cExtension, cert->pCertInfo->rgExtension)))
    {
        CERT_AUTHORITY_INFO_ACCESS *aia;
        DWORD size;

        ret = CryptDecodeObjectEx(X509_ASN_ENCODING, X509_AUTHORITY_INFO_ACCESS,
         ext->Value.pbData, ext->Value.cbData, CRYPT_DECODE_ALLOC_FLAG, NULL,
         &aia, &size);
        if (ret)
        {
            DWORD i, cUrl, bytesNeeded = sizeof(CRYPT_URL_ARRAY);

            for (i = 0, cUrl = 0; i < aia->cAccDescr; i++)
                if (!strcmp(aia->rgAccDescr[i].pszAccessMethod,
                 szOID_PKIX_CA_ISSUERS))
                {
                    if (aia->rgAccDescr[i].AccessLocation.dwAltNameChoice ==
                     CERT_ALT_NAME_URL)
                    {
                        if (aia->rgAccDescr[i].AccessLocation.u.pwszURL)
                        {
                            cUrl++;
                            bytesNeeded += sizeof(LPWSTR) +
                             (lstrlenW(aia->rgAccDescr[i].AccessLocation.u.
                             pwszURL) + 1) * sizeof(WCHAR);
                        }
                    }
                    else
                        FIXME("unsupported alt name type %d\n",
                         aia->rgAccDescr[i].AccessLocation.dwAltNameChoice);
                }
            if (!pcbUrlArray)
            {
                SetLastError(E_INVALIDARG);
                ret = FALSE;
            }
            else if (!pUrlArray)
                *pcbUrlArray = bytesNeeded;
            else if (*pcbUrlArray < bytesNeeded)
            {
                SetLastError(ERROR_MORE_DATA);
                *pcbUrlArray = bytesNeeded;
                ret = FALSE;
            }
            else
            {
                LPWSTR nextUrl;

                *pcbUrlArray = bytesNeeded;
                pUrlArray->cUrl = 0;
                pUrlArray->rgwszUrl =
                 (LPWSTR *)((BYTE *)pUrlArray + sizeof(CRYPT_URL_ARRAY));
                nextUrl = (LPWSTR)((BYTE *)pUrlArray + sizeof(CRYPT_URL_ARRAY)
                 + cUrl * sizeof(LPWSTR));
                for (i = 0; i < aia->cAccDescr; i++)
                    if (!strcmp(aia->rgAccDescr[i].pszAccessMethod,
                     szOID_PKIX_CA_ISSUERS))
                    {
                        if (aia->rgAccDescr[i].AccessLocation.dwAltNameChoice
                         == CERT_ALT_NAME_URL)
                        {
                            if (aia->rgAccDescr[i].AccessLocation.u.pwszURL)
                            {
                                lstrcpyW(nextUrl,
                                 aia->rgAccDescr[i].AccessLocation.u.pwszURL);
                                pUrlArray->rgwszUrl[pUrlArray->cUrl++] =
                                 nextUrl;
                                nextUrl += (lstrlenW(nextUrl) + 1);
                            }
                        }
                    }
            }
            if (ret)
            {
                if (pcbUrlInfo)
                {
                    FIXME("url info: stub\n");
                    if (!pUrlInfo)
                        *pcbUrlInfo = sizeof(CRYPT_URL_INFO);
                    else if (*pcbUrlInfo < sizeof(CRYPT_URL_INFO))
                    {
                        *pcbUrlInfo = sizeof(CRYPT_URL_INFO);
                        SetLastError(ERROR_MORE_DATA);
                        ret = FALSE;
                    }
                    else
                    {
                        *pcbUrlInfo = sizeof(CRYPT_URL_INFO);
                        memset(pUrlInfo, 0, sizeof(CRYPT_URL_INFO));
                    }
                }
            }
            LocalFree(aia);
        }
    }
    else
        SetLastError(CRYPT_E_NOT_FOUND);
    return ret;
}

static BOOL CRYPT_GetUrlFromCRLDistPointsExt(const CRYPT_DATA_BLOB *value,
 PCRYPT_URL_ARRAY pUrlArray, DWORD *pcbUrlArray, PCRYPT_URL_INFO pUrlInfo,
 DWORD *pcbUrlInfo)
{
    BOOL ret;
    CRL_DIST_POINTS_INFO *info;
    DWORD size;

    ret = CryptDecodeObjectEx(X509_ASN_ENCODING, X509_CRL_DIST_POINTS,
     value->pbData, value->cbData, CRYPT_DECODE_ALLOC_FLAG, NULL, &info, &size);
    if (ret)
    {
        DWORD i, cUrl, bytesNeeded = sizeof(CRYPT_URL_ARRAY);

        for (i = 0, cUrl = 0; i < info->cDistPoint; i++)
            if (info->rgDistPoint[i].DistPointName.dwDistPointNameChoice
             == CRL_DIST_POINT_FULL_NAME)
            {
                DWORD j;
                CERT_ALT_NAME_INFO *name =
                 &info->rgDistPoint[i].DistPointName.u.FullName;

                for (j = 0; j < name->cAltEntry; j++)
                    if (name->rgAltEntry[j].dwAltNameChoice ==
                     CERT_ALT_NAME_URL)
                    {
                        if (name->rgAltEntry[j].u.pwszURL)
                        {
                            cUrl++;
                            bytesNeeded += sizeof(LPWSTR) +
                             (lstrlenW(name->rgAltEntry[j].u.pwszURL) + 1)
                             * sizeof(WCHAR);
                        }
                    }
            }
        if (!pcbUrlArray)
        {
            SetLastError(E_INVALIDARG);
            ret = FALSE;
        }
        else if (!pUrlArray)
            *pcbUrlArray = bytesNeeded;
        else if (*pcbUrlArray < bytesNeeded)
        {
            SetLastError(ERROR_MORE_DATA);
            *pcbUrlArray = bytesNeeded;
            ret = FALSE;
        }
        else
        {
            LPWSTR nextUrl;

            *pcbUrlArray = bytesNeeded;
            pUrlArray->cUrl = 0;
            pUrlArray->rgwszUrl =
             (LPWSTR *)((BYTE *)pUrlArray + sizeof(CRYPT_URL_ARRAY));
            nextUrl = (LPWSTR)((BYTE *)pUrlArray + sizeof(CRYPT_URL_ARRAY)
             + cUrl * sizeof(LPWSTR));
            for (i = 0; i < info->cDistPoint; i++)
                if (info->rgDistPoint[i].DistPointName.dwDistPointNameChoice
                 == CRL_DIST_POINT_FULL_NAME)
                {
                    DWORD j;
                    CERT_ALT_NAME_INFO *name =
                     &info->rgDistPoint[i].DistPointName.u.FullName;

                    for (j = 0; j < name->cAltEntry; j++)
                        if (name->rgAltEntry[j].dwAltNameChoice ==
                         CERT_ALT_NAME_URL)
                        {
                            if (name->rgAltEntry[j].u.pwszURL)
                            {
                                lstrcpyW(nextUrl,
                                 name->rgAltEntry[j].u.pwszURL);
                                pUrlArray->rgwszUrl[pUrlArray->cUrl++] =
                                 nextUrl;
                                nextUrl +=
                                 (lstrlenW(name->rgAltEntry[j].u.pwszURL) + 1);
                            }
                        }
                }
        }
        if (ret)
        {
            if (pcbUrlInfo)
            {
                FIXME("url info: stub\n");
                if (!pUrlInfo)
                    *pcbUrlInfo = sizeof(CRYPT_URL_INFO);
                else if (*pcbUrlInfo < sizeof(CRYPT_URL_INFO))
                {
                    *pcbUrlInfo = sizeof(CRYPT_URL_INFO);
                    SetLastError(ERROR_MORE_DATA);
                    ret = FALSE;
                }
                else
                {
                    *pcbUrlInfo = sizeof(CRYPT_URL_INFO);
                    memset(pUrlInfo, 0, sizeof(CRYPT_URL_INFO));
                }
            }
        }
        LocalFree(info);
    }
    return ret;
}

static BOOL WINAPI CRYPT_GetUrlFromCertificateCRLDistPoint(LPCSTR pszUrlOid,
 LPVOID pvPara, DWORD dwFlags, PCRYPT_URL_ARRAY pUrlArray, DWORD *pcbUrlArray,
 PCRYPT_URL_INFO pUrlInfo, DWORD *pcbUrlInfo, LPVOID pvReserved)
{
    PCCERT_CONTEXT cert = pvPara;
    PCERT_EXTENSION ext;
    BOOL ret = FALSE;

    /* The only applicable flag is CRYPT_GET_URL_FROM_EXTENSION */
    if (dwFlags && !(dwFlags & CRYPT_GET_URL_FROM_EXTENSION))
    {
        SetLastError(CRYPT_E_NOT_FOUND);
        return FALSE;
    }
    if ((ext = CertFindExtension(szOID_CRL_DIST_POINTS,
     cert->pCertInfo->cExtension, cert->pCertInfo->rgExtension)))
        ret = CRYPT_GetUrlFromCRLDistPointsExt(&ext->Value, pUrlArray,
         pcbUrlArray, pUrlInfo, pcbUrlInfo);
    else
        SetLastError(CRYPT_E_NOT_FOUND);
    return ret;
}

/***********************************************************************
 *    CryptGetObjectUrl (CRYPTNET.@)
 */
BOOL WINAPI CryptGetObjectUrl(LPCSTR pszUrlOid, LPVOID pvPara, DWORD dwFlags,
 PCRYPT_URL_ARRAY pUrlArray, DWORD *pcbUrlArray, PCRYPT_URL_INFO pUrlInfo,
 DWORD *pcbUrlInfo, LPVOID pvReserved)
{
    UrlDllGetObjectUrlFunc func = NULL;
    HCRYPTOIDFUNCADDR hFunc = NULL;
    BOOL ret = FALSE;

    TRACE("(%s, %p, %08x, %p, %p, %p, %p, %p)\n", debugstr_a(pszUrlOid),
     pvPara, dwFlags, pUrlArray, pcbUrlArray, pUrlInfo, pcbUrlInfo, pvReserved);

    if (IS_INTOID(pszUrlOid))
    {
        switch (LOWORD(pszUrlOid))
        {
        case LOWORD(URL_OID_CERTIFICATE_ISSUER):
            func = CRYPT_GetUrlFromCertificateIssuer;
            break;
        case LOWORD(URL_OID_CERTIFICATE_CRL_DIST_POINT):
            func = CRYPT_GetUrlFromCertificateCRLDistPoint;
            break;
        default:
            FIXME("unimplemented for %s\n", url_oid_to_str(pszUrlOid));
            SetLastError(ERROR_FILE_NOT_FOUND);
        }
    }
    else
    {
        static HCRYPTOIDFUNCSET set = NULL;

        if (!set)
            set = CryptInitOIDFunctionSet(URL_OID_GET_OBJECT_URL_FUNC, 0);
        CryptGetOIDFunctionAddress(set, X509_ASN_ENCODING, pszUrlOid, 0,
         (void **)&func, &hFunc);
    }
    if (func)
        ret = func(pszUrlOid, pvPara, dwFlags, pUrlArray, pcbUrlArray,
         pUrlInfo, pcbUrlInfo, pvReserved);
    if (hFunc)
        CryptFreeOIDFunctionAddress(hFunc, 0);
    return ret;
}

/***********************************************************************
 *    CryptRetrieveObjectByUrlA (CRYPTNET.@)
 */
BOOL WINAPI CryptRetrieveObjectByUrlA(LPCSTR pszURL, LPCSTR pszObjectOid,
 DWORD dwRetrievalFlags, DWORD dwTimeout, LPVOID *ppvObject,
 HCRYPTASYNC hAsyncRetrieve, PCRYPT_CREDENTIALS pCredentials, LPVOID pvVerify,
 PCRYPT_RETRIEVE_AUX_INFO pAuxInfo)
{
    BOOL ret = FALSE;
    int len;

    TRACE("(%s, %s, %08x, %d, %p, %p, %p, %p, %p)\n", debugstr_a(pszURL),
     debugstr_a(pszObjectOid), dwRetrievalFlags, dwTimeout, ppvObject,
     hAsyncRetrieve, pCredentials, pvVerify, pAuxInfo);

    if (!pszURL)
    {
        SetLastError(ERROR_INVALID_PARAMETER);
        return FALSE;
    }
    len = MultiByteToWideChar(CP_ACP, 0, pszURL, -1, NULL, 0);
    if (len)
    {
        LPWSTR url = CryptMemAlloc(len * sizeof(WCHAR));

        if (url)
        {
            MultiByteToWideChar(CP_ACP, 0, pszURL, -1, url, len);
            ret = CryptRetrieveObjectByUrlW(url, pszObjectOid,
             dwRetrievalFlags, dwTimeout, ppvObject, hAsyncRetrieve,
             pCredentials, pvVerify, pAuxInfo);
            CryptMemFree(url);
        }
        else
            SetLastError(ERROR_OUTOFMEMORY);
    }
    return ret;
}

static void WINAPI CRYPT_FreeBlob(LPCSTR pszObjectOid,
 PCRYPT_BLOB_ARRAY pObject, void *pvFreeContext)
{
    DWORD i;

    for (i = 0; i < pObject->cBlob; i++)
        CryptMemFree(pObject->rgBlob[i].pbData);
    CryptMemFree(pObject->rgBlob);
}

static BOOL CRYPT_GetObjectFromFile(HANDLE hFile, PCRYPT_BLOB_ARRAY pObject)
{
    BOOL ret;
    LARGE_INTEGER size;

    if ((ret = GetFileSizeEx(hFile, &size)))
    {
        if (size.u.HighPart)
        {
            WARN("file too big\n");
            SetLastError(ERROR_INVALID_DATA);
            ret = FALSE;
        }
        else
        {
            CRYPT_DATA_BLOB blob;

            blob.pbData = CryptMemAlloc(size.u.LowPart);
            if (blob.pbData)
            {
                blob.cbData = size.u.LowPart;
                ret = ReadFile(hFile, blob.pbData, size.u.LowPart, &blob.cbData,
                 NULL);
                if (ret)
                {
                    pObject->rgBlob = CryptMemAlloc(sizeof(CRYPT_DATA_BLOB));
                    if (pObject->rgBlob)
                    {
                        pObject->cBlob = 1;
                        memcpy(pObject->rgBlob, &blob, sizeof(CRYPT_DATA_BLOB));
                    }
                    else
                    {
                        SetLastError(ERROR_OUTOFMEMORY);
                        ret = FALSE;
                    }
                }
                if (!ret)
                    CryptMemFree(blob.pbData);
            }
            else
            {
                SetLastError(ERROR_OUTOFMEMORY);
                ret = FALSE;
            }
        }
    }
    return ret;
}

static BOOL CRYPT_GetObjectFromCache(LPCWSTR pszURL, PCRYPT_BLOB_ARRAY pObject,
 PCRYPT_RETRIEVE_AUX_INFO pAuxInfo)
{
    BOOL ret = FALSE;
    INTERNET_CACHE_ENTRY_INFOW *pCacheInfo = NULL;
    DWORD size = 0;

    TRACE("(%s, %p, %p)\n", debugstr_w(pszURL), pObject, pAuxInfo);

    ret = GetUrlCacheEntryInfoW(pszURL, NULL, &size);
    if (!ret && GetLastError() == ERROR_INSUFFICIENT_BUFFER)
    {
        pCacheInfo = CryptMemAlloc(size);
        if (pCacheInfo)
            ret = TRUE;
        else
            SetLastError(ERROR_OUTOFMEMORY);
    }
    if (ret && (ret = GetUrlCacheEntryInfoW(pszURL, pCacheInfo, &size)))
    {
        FILETIME ft;

        GetSystemTimeAsFileTime(&ft);
        if (CompareFileTime(&pCacheInfo->ExpireTime, &ft) >= 0)
        {
            HANDLE hFile = CreateFileW(pCacheInfo->lpszLocalFileName,
             GENERIC_READ, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);

            if (hFile != INVALID_HANDLE_VALUE)
            {
                if ((ret = CRYPT_GetObjectFromFile(hFile, pObject)))
                {
                    if (pAuxInfo && pAuxInfo->cbSize >=
                     offsetof(CRYPT_RETRIEVE_AUX_INFO,
                     pLastSyncTime) + sizeof(PFILETIME) &&
                     pAuxInfo->pLastSyncTime)
                        memcpy(pAuxInfo->pLastSyncTime,
                         &pCacheInfo->LastSyncTime,
                         sizeof(FILETIME));
                }
                CloseHandle(hFile);
            }
            else
            {
                DeleteUrlCacheEntryW(pszURL);
                ret = FALSE;
            }
        }
        else
        {
            DeleteUrlCacheEntryW(pszURL);
            ret = FALSE;
        }
    }
    CryptMemFree(pCacheInfo);
    TRACE("returning %d\n", ret);
    return ret;
}

/* Parses the URL, and sets components' lpszHostName and lpszUrlPath members
 * to NULL-terminated copies of those portions of the URL (to be freed with
 * CryptMemFree.)
 */
static BOOL CRYPT_CrackUrl(LPCWSTR pszURL, URL_COMPONENTSW *components)
{
    BOOL ret;

    TRACE("(%s, %p)\n", debugstr_w(pszURL), components);

    memset(components, 0, sizeof(*components));
    components->dwStructSize = sizeof(*components);
    components->lpszHostName = CryptMemAlloc(INTERNET_MAX_HOST_NAME_LENGTH * sizeof(WCHAR));
    components->dwHostNameLength = INTERNET_MAX_HOST_NAME_LENGTH;
    if (!components->lpszHostName)
    {
        SetLastError(ERROR_OUTOFMEMORY);
        return FALSE;
    }
    components->lpszUrlPath = CryptMemAlloc(INTERNET_MAX_PATH_LENGTH * sizeof(WCHAR));
    components->dwUrlPathLength = INTERNET_MAX_PATH_LENGTH;
    if (!components->lpszUrlPath)
    {
        CryptMemFree(components->lpszHostName);
        SetLastError(ERROR_OUTOFMEMORY);
        return FALSE;
    }

    ret = InternetCrackUrlW(pszURL, 0, ICU_DECODE, components);
    if (ret)
    {
        switch (components->nScheme)
        {
        case INTERNET_SCHEME_FTP:
            if (!components->nPort)
                components->nPort = INTERNET_DEFAULT_FTP_PORT;
            break;
        case INTERNET_SCHEME_HTTP:
            if (!components->nPort)
                components->nPort = INTERNET_DEFAULT_HTTP_PORT;
            break;
        default:
            ; /* do nothing */
        }
    }
    TRACE("returning %d\n", ret);
    return ret;
}

struct InetContext
{
    HANDLE event;
    DWORD  timeout;
    DWORD  error;
};

static struct InetContext *CRYPT_MakeInetContext(DWORD dwTimeout)
{
    struct InetContext *context = CryptMemAlloc(sizeof(struct InetContext));

    if (context)
    {
        context->event = CreateEventW(NULL, FALSE, FALSE, NULL);
        if (!context->event)
        {
            CryptMemFree(context);
            context = NULL;
        }
        else
        {
            context->timeout = dwTimeout;
            context->error = ERROR_SUCCESS;
        }
    }
    return context;
}

static BOOL CRYPT_DownloadObject(DWORD dwRetrievalFlags, HINTERNET hHttp,
 struct InetContext *context, PCRYPT_BLOB_ARRAY pObject,
 PCRYPT_RETRIEVE_AUX_INFO pAuxInfo)
{
    CRYPT_DATA_BLOB object = { 0, NULL };
    DWORD bytesAvailable;
    BOOL ret;

    do {
        if ((ret = InternetQueryDataAvailable(hHttp, &bytesAvailable, 0, 0)))
        {
            if (bytesAvailable)
            {
                if (object.pbData)
                    object.pbData = CryptMemRealloc(object.pbData,
                     object.cbData + bytesAvailable);
                else
                    object.pbData = CryptMemAlloc(bytesAvailable);
                if (object.pbData)
                {
                    INTERNET_BUFFERSA buffer = { sizeof(buffer), 0 };

                    buffer.dwBufferLength = bytesAvailable;
                    buffer.lpvBuffer = object.pbData + object.cbData;
                    if (!(ret = InternetReadFileExA(hHttp, &buffer, IRF_NO_WAIT,
                     (DWORD_PTR)context)))
                    {
                        if (GetLastError() == ERROR_IO_PENDING)
                        {
                            if (WaitForSingleObject(context->event,
                             context->timeout) == WAIT_TIMEOUT)
                                SetLastError(ERROR_TIMEOUT);
                            else if (context->error)
                                SetLastError(context->error);
                            else
                                ret = TRUE;
                        }
                    }
                    if (ret)
                        object.cbData += buffer.dwBufferLength;
                }
                else
                {
                    SetLastError(ERROR_OUTOFMEMORY);
                    ret = FALSE;
                }
            }
        }
        else if (GetLastError() == ERROR_IO_PENDING)
        {
            if (WaitForSingleObject(context->event, context->timeout) ==
             WAIT_TIMEOUT)
                SetLastError(ERROR_TIMEOUT);
            else
                ret = TRUE;
        }
    } while (ret && bytesAvailable);
    if (ret)
    {
        pObject->rgBlob = CryptMemAlloc(sizeof(CRYPT_DATA_BLOB));
        if (!pObject->rgBlob)
        {
            CryptMemFree(object.pbData);
            SetLastError(ERROR_OUTOFMEMORY);
            ret = FALSE;
        }
        else
        {
            pObject->rgBlob[0].cbData = object.cbData;
            pObject->rgBlob[0].pbData = object.pbData;
            pObject->cBlob = 1;
        }
    }
    TRACE("returning %d\n", ret);
    return ret;
}

/* Finds the object specified by pszURL in the cache.  If it's not found,
 * creates a new cache entry for the object and writes the object to it.
 * Sets the expiration time of the cache entry to expires.
 */
static void CRYPT_CacheURL(LPCWSTR pszURL, const CRYPT_BLOB_ARRAY *pObject,
 DWORD dwRetrievalFlags, FILETIME expires)
{
    WCHAR cacheFileName[MAX_PATH];
    DWORD size = 0;
    BOOL ret, create = FALSE;

    GetUrlCacheEntryInfoW(pszURL, NULL, &size);
    if (GetLastError() == ERROR_INSUFFICIENT_BUFFER)
    {
        INTERNET_CACHE_ENTRY_INFOW *info = CryptMemAlloc(size);

        if (info)
        {
            FILETIME ft;

            ret = GetUrlCacheEntryInfoW(pszURL, info, &size);
            if (ret)
                lstrcpyW(cacheFileName, info->lpszLocalFileName);
            /* Check if the existing cache entry is up to date.  If it isn't,
             * remove the existing cache entry, and create a new one with the
             * new value.
             */
            GetSystemTimeAsFileTime(&ft);
            if (CompareFileTime(&info->ExpireTime, &ft) < 0)
            {
                create = TRUE;
                DeleteUrlCacheEntryW(pszURL);
            }
            CryptMemFree(info);
        }
        else
            ret = FALSE;
    }
    else
    {
        ret = CreateUrlCacheEntryW(pszURL, pObject->rgBlob[0].cbData, NULL,
         cacheFileName, 0);
        create = TRUE;
    }
    if (ret)
    {
        DWORD entryType;
        FILETIME ft = { 0 };

        if (create)
        {
            HANDLE hCacheFile = CreateFileW(cacheFileName, GENERIC_WRITE, 0,
             NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);

            if (hCacheFile != INVALID_HANDLE_VALUE)
            {
                DWORD bytesWritten;

                WriteFile(hCacheFile, pObject->rgBlob[0].pbData,
                 pObject->rgBlob[0].cbData, &bytesWritten, NULL);
                CloseHandle(hCacheFile);
            }
            else
                ret = FALSE;
        }
        if (ret)
        {
            if (!(dwRetrievalFlags & CRYPT_STICKY_CACHE_RETRIEVAL))
                entryType = NORMAL_CACHE_ENTRY;
            else
                entryType = STICKY_CACHE_ENTRY;
            CommitUrlCacheEntryW(pszURL, cacheFileName, expires, ft, entryType,
             NULL, 0, NULL, NULL);
        }
    }
}

static void CALLBACK CRYPT_InetStatusCallback(HINTERNET hInt,
 DWORD_PTR dwContext, DWORD status, void *statusInfo, DWORD statusInfoLen)
{
    struct InetContext *context = (struct InetContext *)dwContext;
    LPINTERNET_ASYNC_RESULT result;

    switch (status)
    {
    case INTERNET_STATUS_REQUEST_COMPLETE:
        result = statusInfo;
        context->error = result->dwError;
        SetEvent(context->event);
    }
}

static BOOL CRYPT_Connect(const URL_COMPONENTSW *components,
 struct InetContext *context, PCRYPT_CREDENTIALS pCredentials,
 HINTERNET *phInt, HINTERNET *phHost)
{
    BOOL ret;

    TRACE("(%s:%d, %p, %p, %p, %p)\n", debugstr_w(components->lpszHostName),
     components->nPort, context, pCredentials, phInt, phInt);

    *phHost = NULL;
    *phInt = InternetOpenW(NULL, INTERNET_OPEN_TYPE_PRECONFIG, NULL, NULL,
     context ? INTERNET_FLAG_ASYNC : 0);
    if (*phInt)
    {
        DWORD service;

        if (context)
            InternetSetStatusCallbackW(*phInt, CRYPT_InetStatusCallback);
        switch (components->nScheme)
        {
        case INTERNET_SCHEME_FTP:
            service = INTERNET_SERVICE_FTP;
            break;
        case INTERNET_SCHEME_HTTP:
            service = INTERNET_SERVICE_HTTP;
            break;
        default:
            service = 0;
        }
        /* FIXME: use pCredentials for username/password */
        *phHost = InternetConnectW(*phInt, components->lpszHostName,
         components->nPort, NULL, NULL, service, 0, (DWORD_PTR)context);
        if (!*phHost)
        {
            InternetCloseHandle(*phInt);
            *phInt = NULL;
            ret = FALSE;
        }
        else
            ret = TRUE;
    }
    else
        ret = FALSE;
    TRACE("returning %d\n", ret);
    return ret;
}

static BOOL WINAPI FTP_RetrieveEncodedObjectW(LPCWSTR pszURL,
 LPCSTR pszObjectOid, DWORD dwRetrievalFlags, DWORD dwTimeout,
 PCRYPT_BLOB_ARRAY pObject, PFN_FREE_ENCODED_OBJECT_FUNC *ppfnFreeObject,
 void **ppvFreeContext, HCRYPTASYNC hAsyncRetrieve,
 PCRYPT_CREDENTIALS pCredentials, PCRYPT_RETRIEVE_AUX_INFO pAuxInfo)
{
    FIXME("(%s, %s, %08x, %d, %p, %p, %p, %p, %p, %p)\n", debugstr_w(pszURL),
     debugstr_a(pszObjectOid), dwRetrievalFlags, dwTimeout, pObject,
     ppfnFreeObject, ppvFreeContext, hAsyncRetrieve, pCredentials, pAuxInfo);

    pObject->cBlob = 0;
    pObject->rgBlob = NULL;
    *ppfnFreeObject = CRYPT_FreeBlob;
    *ppvFreeContext = NULL;
    return FALSE;
}

static const WCHAR x509cacert[] = { 'a','p','p','l','i','c','a','t','i','o','n',
 '/','x','-','x','5','0','9','-','c','a','-','c','e','r','t',0 };
static const WCHAR x509emailcert[] = { 'a','p','p','l','i','c','a','t','i','o',
 'n','/','x','-','x','5','0','9','-','e','m','a','i','l','-','c','e','r','t',
 0 };
static const WCHAR x509servercert[] = { 'a','p','p','l','i','c','a','t','i','o',
 'n','/','x','-','x','5','0','9','-','s','e','r','v','e','r','-','c','e','r',
 't',0 };
static const WCHAR x509usercert[] = { 'a','p','p','l','i','c','a','t','i','o',
 'n','/','x','-','x','5','0','9','-','u','s','e','r','-','c','e','r','t',0 };
static const WCHAR pkcs7cert[] = { 'a','p','p','l','i','c','a','t','i','o','n',
 '/','x','-','p','k','c','s','7','-','c','e','r','t','i','f','c','a','t','e',
 's',0 };
static const WCHAR pkixCRL[] = { 'a','p','p','l','i','c','a','t','i','o','n',
 '/','p','k','i','x','-','c','r','l',0 };
static const WCHAR pkcs7CRL[] = { 'a','p','p','l','i','c','a','t','i','o','n',
 '/','x','-','p','k','c','s','7','-','c','r','l',0 };
static const WCHAR pkcs7sig[] = { 'a','p','p','l','i','c','a','t','i','o','n',
 '/','x','-','p','k','c','s','7','-','s','i','g','n','a','t','u','r','e',0 };
static const WCHAR pkcs7mime[] = { 'a','p','p','l','i','c','a','t','i','o','n',
 '/','x','-','p','k','c','s','7','-','m','i','m','e',0 };

static BOOL WINAPI HTTP_RetrieveEncodedObjectW(LPCWSTR pszURL,
 LPCSTR pszObjectOid, DWORD dwRetrievalFlags, DWORD dwTimeout,
 PCRYPT_BLOB_ARRAY pObject, PFN_FREE_ENCODED_OBJECT_FUNC *ppfnFreeObject,
 void **ppvFreeContext, HCRYPTASYNC hAsyncRetrieve,
 PCRYPT_CREDENTIALS pCredentials, PCRYPT_RETRIEVE_AUX_INFO pAuxInfo)
{
    BOOL ret = FALSE;

    TRACE("(%s, %s, %08x, %d, %p, %p, %p, %p, %p, %p)\n", debugstr_w(pszURL),
     debugstr_a(pszObjectOid), dwRetrievalFlags, dwTimeout, pObject,
     ppfnFreeObject, ppvFreeContext, hAsyncRetrieve, pCredentials, pAuxInfo);

    pObject->cBlob = 0;
    pObject->rgBlob = NULL;
    *ppfnFreeObject = CRYPT_FreeBlob;
    *ppvFreeContext = NULL;

    if (!(dwRetrievalFlags & CRYPT_WIRE_ONLY_RETRIEVAL))
        ret = CRYPT_GetObjectFromCache(pszURL, pObject, pAuxInfo);
    if (!ret && (!(dwRetrievalFlags & CRYPT_CACHE_ONLY_RETRIEVAL) ||
     (dwRetrievalFlags & CRYPT_WIRE_ONLY_RETRIEVAL)))
    {
        URL_COMPONENTSW components;

        if ((ret = CRYPT_CrackUrl(pszURL, &components)))
        {
            HINTERNET hInt, hHost;
            struct InetContext *context = NULL;

            if (dwTimeout)
                context = CRYPT_MakeInetContext(dwTimeout);
            ret = CRYPT_Connect(&components, context, pCredentials, &hInt,
             &hHost);
            if (ret)
            {
                static LPCWSTR types[] = { x509cacert, x509emailcert,
                 x509servercert, x509usercert, pkcs7cert, pkixCRL, pkcs7CRL,
                 pkcs7sig, pkcs7mime, NULL };
                HINTERNET hHttp = HttpOpenRequestW(hHost, NULL,
                 components.lpszUrlPath, NULL, NULL, types,
                 INTERNET_FLAG_NO_COOKIES | INTERNET_FLAG_NO_UI,
                 (DWORD_PTR)context);

                if (hHttp)
                {
                    if (dwTimeout)
                    {
                        InternetSetOptionW(hHttp,
                         INTERNET_OPTION_RECEIVE_TIMEOUT, &dwTimeout,
                         sizeof(dwTimeout));
                        InternetSetOptionW(hHttp, INTERNET_OPTION_SEND_TIMEOUT,
                         &dwTimeout, sizeof(dwTimeout));
                    }
                    ret = HttpSendRequestExW(hHttp, NULL, NULL, 0,
                     (DWORD_PTR)context);
                    if (!ret && GetLastError() == ERROR_IO_PENDING)
                    {
                        if (WaitForSingleObject(context->event,
                         context->timeout) == WAIT_TIMEOUT)
                            SetLastError(ERROR_TIMEOUT);
                        else
                            ret = TRUE;
                    }
                    /* We don't set ret to TRUE in this block to avoid masking
                     * an error from HttpSendRequestExW.
                     */
                    if (!HttpEndRequestW(hHttp, NULL, 0, (DWORD_PTR)context) &&
                     GetLastError() == ERROR_IO_PENDING)
                    {
                        if (WaitForSingleObject(context->event,
                         context->timeout) == WAIT_TIMEOUT)
                        {
                            SetLastError(ERROR_TIMEOUT);
                            ret = FALSE;
                        }
                    }
                    if (ret)
                        ret = CRYPT_DownloadObject(dwRetrievalFlags, hHttp,
                         context, pObject, pAuxInfo);
                    if (ret && !(dwRetrievalFlags & CRYPT_DONT_CACHE_RESULT))
                    {
                        SYSTEMTIME st;
                        DWORD len = sizeof(st);

                        if (HttpQueryInfoW(hHttp,
                         HTTP_QUERY_EXPIRES | HTTP_QUERY_FLAG_SYSTEMTIME, &st,
                         &len, NULL))
                        {
                            FILETIME ft;

                            SystemTimeToFileTime(&st, &ft);
                            CRYPT_CacheURL(pszURL, pObject, dwRetrievalFlags,
                             ft);
                        }
                    }
                    InternetCloseHandle(hHttp);
                }
                InternetCloseHandle(hHost);
                InternetCloseHandle(hInt);
            }
            if (context)
            {
                CloseHandle(context->event);
                CryptMemFree(context);
            }
            CryptMemFree(components.lpszUrlPath);
            CryptMemFree(components.lpszHostName);
        }
    }
    TRACE("returning %d\n", ret);
    return ret;
}

static BOOL WINAPI File_RetrieveEncodedObjectW(LPCWSTR pszURL,
 LPCSTR pszObjectOid, DWORD dwRetrievalFlags, DWORD dwTimeout,
 PCRYPT_BLOB_ARRAY pObject, PFN_FREE_ENCODED_OBJECT_FUNC *ppfnFreeObject,
 void **ppvFreeContext, HCRYPTASYNC hAsyncRetrieve,
 PCRYPT_CREDENTIALS pCredentials, PCRYPT_RETRIEVE_AUX_INFO pAuxInfo)
{
    URL_COMPONENTSW components = { sizeof(components), 0 };
    BOOL ret;

    TRACE("(%s, %s, %08x, %d, %p, %p, %p, %p, %p, %p)\n", debugstr_w(pszURL),
     debugstr_a(pszObjectOid), dwRetrievalFlags, dwTimeout, pObject,
     ppfnFreeObject, ppvFreeContext, hAsyncRetrieve, pCredentials, pAuxInfo);

    pObject->cBlob = 0;
    pObject->rgBlob = NULL;
    *ppfnFreeObject = CRYPT_FreeBlob;
    *ppvFreeContext = NULL;

    components.lpszUrlPath = CryptMemAlloc(INTERNET_MAX_PATH_LENGTH * sizeof(WCHAR));
    components.dwUrlPathLength = INTERNET_MAX_PATH_LENGTH;
    if (!components.lpszUrlPath)
    {
        SetLastError(ERROR_OUTOFMEMORY);
        return FALSE;
    }

    ret = InternetCrackUrlW(pszURL, 0, ICU_DECODE, &components);
    if (ret)
    {
        LPWSTR path;

        /* 3 == lstrlenW(L"c:") + 1 */
        path = CryptMemAlloc((components.dwUrlPathLength + 3) * sizeof(WCHAR));
        if (path)
        {
            HANDLE hFile;

            /* Try to create the file directly - Wine handles / in pathnames */
            lstrcpynW(path, components.lpszUrlPath,
             components.dwUrlPathLength + 1);
            hFile = CreateFileW(path, GENERIC_READ, 0, NULL, OPEN_EXISTING,
             FILE_ATTRIBUTE_NORMAL, NULL);
            if (hFile == INVALID_HANDLE_VALUE)
            {
                /* Try again on the current drive */
                GetCurrentDirectoryW(components.dwUrlPathLength, path);
                if (path[1] == ':')
                {
                    lstrcpynW(path + 2, components.lpszUrlPath,
                     components.dwUrlPathLength + 1);
                    hFile = CreateFileW(path, GENERIC_READ, 0, NULL,
                     OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
                }
                if (hFile == INVALID_HANDLE_VALUE)
                {
                    /* Try again on the Windows drive */
                    GetWindowsDirectoryW(path, components.dwUrlPathLength);
                    if (path[1] == ':')
                    {
                        lstrcpynW(path + 2, components.lpszUrlPath,
                         components.dwUrlPathLength + 1);
                        hFile = CreateFileW(path, GENERIC_READ, 0, NULL,
                         OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
                    }
                }
            }
            if (hFile != INVALID_HANDLE_VALUE)
            {
                if ((ret = CRYPT_GetObjectFromFile(hFile, pObject)))
                {
                    if (pAuxInfo && pAuxInfo->cbSize >=
                     offsetof(CRYPT_RETRIEVE_AUX_INFO,
                     pLastSyncTime) + sizeof(PFILETIME) &&
                     pAuxInfo->pLastSyncTime)
                        GetFileTime(hFile, NULL, NULL,
                         pAuxInfo->pLastSyncTime);
                }
                CloseHandle(hFile);
            }
            else
                ret = FALSE;
            CryptMemFree(path);
        }
        else
        {
            SetLastError(ERROR_OUTOFMEMORY);
            ret = FALSE;
        }
    }
    CryptMemFree(components.lpszUrlPath);
    return ret;
}

typedef BOOL (WINAPI *SchemeDllRetrieveEncodedObjectW)(LPCWSTR pwszUrl,
 LPCSTR pszObjectOid, DWORD dwRetrievalFlags, DWORD dwTimeout,
 PCRYPT_BLOB_ARRAY pObject, PFN_FREE_ENCODED_OBJECT_FUNC *ppfnFreeObject,
 void **ppvFreeContext, HCRYPTASYNC hAsyncRetrieve,
 PCRYPT_CREDENTIALS pCredentials, PCRYPT_RETRIEVE_AUX_INFO pAuxInfo);

static BOOL CRYPT_GetRetrieveFunction(LPCWSTR pszURL,
 SchemeDllRetrieveEncodedObjectW *pFunc, HCRYPTOIDFUNCADDR *phFunc)
{
    URL_COMPONENTSW components = { sizeof(components), 0 };
    BOOL ret;

    TRACE("(%s, %p, %p)\n", debugstr_w(pszURL), pFunc, phFunc);

    *pFunc = NULL;
    *phFunc = 0;
    components.dwSchemeLength = 1;
    ret = InternetCrackUrlW(pszURL, 0, 0, &components);
    if (ret)
    {
        /* Microsoft always uses CryptInitOIDFunctionSet/
         * CryptGetOIDFunctionAddress, but there doesn't seem to be a pressing
         * reason to do so for builtin schemes.
         */
        switch (components.nScheme)
        {
        case INTERNET_SCHEME_FTP:
            *pFunc = FTP_RetrieveEncodedObjectW;
            break;
        case INTERNET_SCHEME_HTTP:
            *pFunc = HTTP_RetrieveEncodedObjectW;
            break;
        case INTERNET_SCHEME_FILE:
            *pFunc = File_RetrieveEncodedObjectW;
            break;
        default:
        {
            int len = WideCharToMultiByte(CP_ACP, 0, components.lpszScheme,
             components.dwSchemeLength, NULL, 0, NULL, NULL);

            if (len)
            {
                LPSTR scheme = CryptMemAlloc(len);

                if (scheme)
                {
                    static HCRYPTOIDFUNCSET set = NULL;

                    if (!set)
                        set = CryptInitOIDFunctionSet(
                         SCHEME_OID_RETRIEVE_ENCODED_OBJECTW_FUNC, 0);
                    WideCharToMultiByte(CP_ACP, 0, components.lpszScheme,
                     components.dwSchemeLength, scheme, len, NULL, NULL);
                    ret = CryptGetOIDFunctionAddress(set, X509_ASN_ENCODING,
                     scheme, 0, (void **)pFunc, phFunc);
                    CryptMemFree(scheme);
                }
                else
                {
                    SetLastError(ERROR_OUTOFMEMORY);
                    ret = FALSE;
                }
            }
            else
                ret = FALSE;
        }
        }
    }
    TRACE("returning %d\n", ret);
    return ret;
}

static BOOL WINAPI CRYPT_CreateBlob(LPCSTR pszObjectOid,
 DWORD dwRetrievalFlags, const CRYPT_BLOB_ARRAY *pObject, void **ppvContext)
{
    DWORD size, i;
    CRYPT_BLOB_ARRAY *context;
    BOOL ret = FALSE;

    size = sizeof(CRYPT_BLOB_ARRAY) + pObject->cBlob * sizeof(CRYPT_DATA_BLOB);
    for (i = 0; i < pObject->cBlob; i++)
        size += pObject->rgBlob[i].cbData;
    context = CryptMemAlloc(size);
    if (context)
    {
        LPBYTE nextData;

        context->cBlob = 0;
        context->rgBlob =
         (CRYPT_DATA_BLOB *)((LPBYTE)context + sizeof(CRYPT_BLOB_ARRAY));
        nextData =
         (LPBYTE)context->rgBlob + pObject->cBlob * sizeof(CRYPT_DATA_BLOB);
        for (i = 0; i < pObject->cBlob; i++)
        {
            memcpy(nextData, pObject->rgBlob[i].pbData,
             pObject->rgBlob[i].cbData);
            context->rgBlob[i].pbData = nextData;
            context->rgBlob[i].cbData = pObject->rgBlob[i].cbData;
            nextData += pObject->rgBlob[i].cbData;
            context->cBlob++;
        }
        *ppvContext = context;
        ret = TRUE;
    }
    return ret;
}

typedef BOOL (WINAPI *AddContextToStore)(HCERTSTORE hCertStore,
 const void *pContext, DWORD dwAddDisposition, const void **ppStoreContext);

static BOOL CRYPT_CreateContext(const CRYPT_BLOB_ARRAY *pObject,
 DWORD dwExpectedContentTypeFlags, AddContextToStore addFunc, void **ppvContext)
{
    BOOL ret = TRUE;

    if (!pObject->cBlob)
    {
        SetLastError(ERROR_INVALID_DATA);
        *ppvContext = NULL;
        ret = FALSE;
    }
    else if (pObject->cBlob == 1)
    {
        if (!CryptQueryObject(CERT_QUERY_OBJECT_BLOB, &pObject->rgBlob[0],
         dwExpectedContentTypeFlags, CERT_QUERY_FORMAT_FLAG_BINARY, 0, NULL,
         NULL, NULL, NULL, NULL, (const void **)ppvContext))
        {
            SetLastError(CRYPT_E_NO_MATCH);
            ret = FALSE;
        }
    }
    else
    {
        HCERTSTORE store = CertOpenStore(CERT_STORE_PROV_MEMORY, 0, 0,
         CERT_STORE_CREATE_NEW_FLAG, NULL);

        if (store)
        {
            DWORD i;
            const void *context;

            for (i = 0; i < pObject->cBlob; i++)
            {
                if (CryptQueryObject(CERT_QUERY_OBJECT_BLOB,
                 &pObject->rgBlob[i], dwExpectedContentTypeFlags,
                 CERT_QUERY_FORMAT_FLAG_BINARY, 0, NULL, NULL, NULL, NULL,
                 NULL, &context))
                {
                    if (!addFunc(store, context, CERT_STORE_ADD_ALWAYS, NULL))
                        ret = FALSE;
                }
                else
                {
                    SetLastError(CRYPT_E_NO_MATCH);
                    ret = FALSE;
                }
            }
        }
        else
            ret = FALSE;
        *ppvContext = store;
    }
    return ret;
}

static BOOL WINAPI CRYPT_CreateCert(LPCSTR pszObjectOid,
 DWORD dwRetrievalFlags, const CRYPT_BLOB_ARRAY *pObject, void **ppvContext)
{
    return CRYPT_CreateContext(pObject, CERT_QUERY_CONTENT_FLAG_CERT,
     (AddContextToStore)CertAddCertificateContextToStore, ppvContext);
}

static BOOL WINAPI CRYPT_CreateCRL(LPCSTR pszObjectOid,
 DWORD dwRetrievalFlags, const CRYPT_BLOB_ARRAY *pObject, void **ppvContext)
{
    return CRYPT_CreateContext(pObject, CERT_QUERY_CONTENT_FLAG_CRL,
     (AddContextToStore)CertAddCRLContextToStore, ppvContext);
}

static BOOL WINAPI CRYPT_CreateCTL(LPCSTR pszObjectOid,
 DWORD dwRetrievalFlags, const CRYPT_BLOB_ARRAY *pObject, void **ppvContext)
{
    return CRYPT_CreateContext(pObject, CERT_QUERY_CONTENT_FLAG_CTL,
     (AddContextToStore)CertAddCTLContextToStore, ppvContext);
}

static BOOL WINAPI CRYPT_CreatePKCS7(LPCSTR pszObjectOid,
 DWORD dwRetrievalFlags, const CRYPT_BLOB_ARRAY *pObject, void **ppvContext)
{
    BOOL ret;

    if (!pObject->cBlob)
    {
        SetLastError(ERROR_INVALID_DATA);
        *ppvContext = NULL;
        ret = FALSE;
    }
    else if (pObject->cBlob == 1)
        ret = CryptQueryObject(CERT_QUERY_OBJECT_BLOB, &pObject->rgBlob[0],
         CERT_QUERY_CONTENT_FLAG_PKCS7_SIGNED |
         CERT_QUERY_CONTENT_FLAG_PKCS7_UNSIGNED, CERT_QUERY_FORMAT_FLAG_BINARY,
         0, NULL, NULL, NULL, ppvContext, NULL, NULL);
    else
    {
        FIXME("multiple messages unimplemented\n");
        ret = FALSE;
    }
    return ret;
}

static BOOL WINAPI CRYPT_CreateAny(LPCSTR pszObjectOid,
 DWORD dwRetrievalFlags, const CRYPT_BLOB_ARRAY *pObject, void **ppvContext)
{
    BOOL ret;

    if (!pObject->cBlob)
    {
        SetLastError(ERROR_INVALID_DATA);
        *ppvContext = NULL;
        ret = FALSE;
    }
    else
    {
        HCERTSTORE store = CertOpenStore(CERT_STORE_PROV_COLLECTION, 0, 0,
         CERT_STORE_CREATE_NEW_FLAG, NULL);

        if (store)
        {
            HCERTSTORE memStore = CertOpenStore(CERT_STORE_PROV_MEMORY, 0, 0,
             CERT_STORE_CREATE_NEW_FLAG, NULL);

            if (memStore)
            {
                CertAddStoreToCollection(store, memStore,
                 CERT_PHYSICAL_STORE_ADD_ENABLE_FLAG, 0);
                CertCloseStore(memStore, 0);
            }
            else
            {
                CertCloseStore(store, 0);
                store = NULL;
            }
        }
        if (store)
        {
            DWORD i;

            ret = TRUE;
            for (i = 0; i < pObject->cBlob; i++)
            {
                DWORD contentType, expectedContentTypes =
                 CERT_QUERY_CONTENT_FLAG_PKCS7_SIGNED |
                 CERT_QUERY_CONTENT_FLAG_PKCS7_UNSIGNED |
                 CERT_QUERY_CONTENT_FLAG_CERT |
                 CERT_QUERY_CONTENT_FLAG_CRL |
                 CERT_QUERY_CONTENT_FLAG_CTL;
                HCERTSTORE contextStore;
                const void *context;

                if (CryptQueryObject(CERT_QUERY_OBJECT_BLOB,
                 &pObject->rgBlob[i], expectedContentTypes,
                 CERT_QUERY_FORMAT_FLAG_BINARY, 0, NULL, &contentType, NULL,
                 &contextStore, NULL, &context))
                {
                    switch (contentType)
                    {
                    case CERT_QUERY_CONTENT_CERT:
                        if (!CertAddCertificateContextToStore(store,
                         context, CERT_STORE_ADD_ALWAYS, NULL))
                            ret = FALSE;
                        CertFreeCertificateContext(context);
                        break;
                    case CERT_QUERY_CONTENT_CRL:
                        if (!CertAddCRLContextToStore(store,
                         context, CERT_STORE_ADD_ALWAYS, NULL))
                             ret = FALSE;
                        CertFreeCRLContext(context);
                        break;
                    case CERT_QUERY_CONTENT_CTL:
                        if (!CertAddCTLContextToStore(store,
                         context, CERT_STORE_ADD_ALWAYS, NULL))
                             ret = FALSE;
                        CertFreeCTLContext(context);
                        break;
                    default:
                        CertAddStoreToCollection(store, contextStore, 0, 0);
                    }
                    CertCloseStore(contextStore, 0);
                }
                else
                    ret = FALSE;
            }
        }
        else
            ret = FALSE;
        *ppvContext = store;
    }
    return ret;
}

typedef BOOL (WINAPI *ContextDllCreateObjectContext)(LPCSTR pszObjectOid,
 DWORD dwRetrievalFlags, const CRYPT_BLOB_ARRAY *pObject, void **ppvContext);

static BOOL CRYPT_GetCreateFunction(LPCSTR pszObjectOid,
 ContextDllCreateObjectContext *pFunc, HCRYPTOIDFUNCADDR *phFunc)
{
    BOOL ret = TRUE;

    TRACE("(%s, %p, %p)\n", debugstr_a(pszObjectOid), pFunc, phFunc);

    *pFunc = NULL;
    *phFunc = 0;
    if (IS_INTOID(pszObjectOid))
    {
        switch (LOWORD(pszObjectOid))
        {
        case 0:
            *pFunc = CRYPT_CreateBlob;
            break;
        case LOWORD(CONTEXT_OID_CERTIFICATE):
            *pFunc = CRYPT_CreateCert;
            break;
        case LOWORD(CONTEXT_OID_CRL):
            *pFunc = CRYPT_CreateCRL;
            break;
        case LOWORD(CONTEXT_OID_CTL):
            *pFunc = CRYPT_CreateCTL;
            break;
        case LOWORD(CONTEXT_OID_PKCS7):
            *pFunc = CRYPT_CreatePKCS7;
            break;
        case LOWORD(CONTEXT_OID_CAPI2_ANY):
            *pFunc = CRYPT_CreateAny;
            break;
        }
    }
    if (!*pFunc)
    {
        static HCRYPTOIDFUNCSET set = NULL;

        if (!set)
            set = CryptInitOIDFunctionSet(
             CONTEXT_OID_CREATE_OBJECT_CONTEXT_FUNC, 0);
        ret = CryptGetOIDFunctionAddress(set, X509_ASN_ENCODING, pszObjectOid,
         0, (void **)pFunc, phFunc);
    }
    TRACE("returning %d\n", ret);
    return ret;
}

typedef BOOL (*get_object_expiration_func)(const void *pvContext,
 FILETIME *expiration);

static BOOL CRYPT_GetExpirationFromCert(const void *pvObject, FILETIME *expiration)
{
    PCCERT_CONTEXT cert = pvObject;

    *expiration = cert->pCertInfo->NotAfter;
    return TRUE;
}

static BOOL CRYPT_GetExpirationFromCRL(const void *pvObject, FILETIME *expiration)
{
    PCCRL_CONTEXT cert = pvObject;

    *expiration = cert->pCrlInfo->NextUpdate;
    return TRUE;
}

static BOOL CRYPT_GetExpirationFromCTL(const void *pvObject, FILETIME *expiration)
{
    PCCTL_CONTEXT cert = pvObject;

    *expiration = cert->pCtlInfo->NextUpdate;
    return TRUE;
}

static BOOL CRYPT_GetExpirationFunction(LPCSTR pszObjectOid,
 get_object_expiration_func *getExpiration)
{
    BOOL ret;

    if (IS_INTOID(pszObjectOid))
    {
        switch (LOWORD(pszObjectOid))
        {
        case LOWORD(CONTEXT_OID_CERTIFICATE):
            *getExpiration = CRYPT_GetExpirationFromCert;
            ret = TRUE;
            break;
        case LOWORD(CONTEXT_OID_CRL):
            *getExpiration = CRYPT_GetExpirationFromCRL;
            ret = TRUE;
            break;
        case LOWORD(CONTEXT_OID_CTL):
            *getExpiration = CRYPT_GetExpirationFromCTL;
            ret = TRUE;
            break;
        default:
            ret = FALSE;
        }
    }
    else
        ret = FALSE;
    return ret;
}

/***********************************************************************
 *    CryptRetrieveObjectByUrlW (CRYPTNET.@)
 */
BOOL WINAPI CryptRetrieveObjectByUrlW(LPCWSTR pszURL, LPCSTR pszObjectOid,
 DWORD dwRetrievalFlags, DWORD dwTimeout, LPVOID *ppvObject,
 HCRYPTASYNC hAsyncRetrieve, PCRYPT_CREDENTIALS pCredentials, LPVOID pvVerify,
 PCRYPT_RETRIEVE_AUX_INFO pAuxInfo)
{
    BOOL ret;
    SchemeDllRetrieveEncodedObjectW retrieve;
    ContextDllCreateObjectContext create;
    HCRYPTOIDFUNCADDR hRetrieve = 0, hCreate = 0;

    TRACE("(%s, %s, %08x, %d, %p, %p, %p, %p, %p)\n", debugstr_w(pszURL),
     debugstr_a(pszObjectOid), dwRetrievalFlags, dwTimeout, ppvObject,
     hAsyncRetrieve, pCredentials, pvVerify, pAuxInfo);

    if (!pszURL)
    {
        SetLastError(ERROR_INVALID_PARAMETER);
        return FALSE;
    }
    ret = CRYPT_GetRetrieveFunction(pszURL, &retrieve, &hRetrieve);
    if (ret)
        ret = CRYPT_GetCreateFunction(pszObjectOid, &create, &hCreate);
    if (ret)
    {
        CRYPT_BLOB_ARRAY object = { 0, NULL };
        PFN_FREE_ENCODED_OBJECT_FUNC freeObject;
        void *freeContext;

        ret = retrieve(pszURL, pszObjectOid, dwRetrievalFlags, dwTimeout,
         &object, &freeObject, &freeContext, hAsyncRetrieve, pCredentials,
         pAuxInfo);
        if (ret)
        {
            get_object_expiration_func getExpiration;

            ret = create(pszObjectOid, dwRetrievalFlags, &object, ppvObject);
            if (ret && !(dwRetrievalFlags & CRYPT_DONT_CACHE_RESULT) &&
             CRYPT_GetExpirationFunction(pszObjectOid, &getExpiration))
            {
                FILETIME expires;

                if (getExpiration(*ppvObject, &expires))
                    CRYPT_CacheURL(pszURL, &object, dwRetrievalFlags, expires);
            }
            freeObject(pszObjectOid, &object, freeContext);
        }
    }
    if (hCreate)
        CryptFreeOIDFunctionAddress(hCreate, 0);
    if (hRetrieve)
        CryptFreeOIDFunctionAddress(hRetrieve, 0);
    TRACE("returning %d\n", ret);
    return ret;
}

static DWORD verify_cert_revocation_with_crl_online(PCCERT_CONTEXT cert,
 PCCRL_CONTEXT crl, DWORD index, FILETIME *pTime,
 PCERT_REVOCATION_STATUS pRevStatus)
{
    DWORD error;
    PCRL_ENTRY entry = NULL;

    CertFindCertificateInCRL(cert, crl, 0, NULL, &entry);
    if (entry)
    {
        error = CRYPT_E_REVOKED;
        pRevStatus->dwIndex = index;
    }
    else
    {
        /* Since the CRL was retrieved for the cert being checked, then it's
         * guaranteed to be fresh, and the cert is not revoked.
         */
        error = ERROR_SUCCESS;
    }
    return error;
}

static DWORD verify_cert_revocation_from_dist_points_ext(
 const CRYPT_DATA_BLOB *value, PCCERT_CONTEXT cert, DWORD index,
 FILETIME *pTime, DWORD dwFlags, const CERT_REVOCATION_PARA *pRevPara,
 PCERT_REVOCATION_STATUS pRevStatus)
{
    DWORD error = ERROR_SUCCESS, cbUrlArray;

    if (CRYPT_GetUrlFromCRLDistPointsExt(value, NULL, &cbUrlArray, NULL, NULL))
    {
        CRYPT_URL_ARRAY *urlArray = CryptMemAlloc(cbUrlArray);

        if (urlArray)
        {
            DWORD j, retrievalFlags = 0, startTime, endTime, timeout;
            BOOL ret;

            ret = CRYPT_GetUrlFromCRLDistPointsExt(value, urlArray,
             &cbUrlArray, NULL, NULL);
            if (dwFlags & CERT_VERIFY_CACHE_ONLY_BASED_REVOCATION)
                retrievalFlags |= CRYPT_CACHE_ONLY_RETRIEVAL;
            if (dwFlags & CERT_VERIFY_REV_ACCUMULATIVE_TIMEOUT_FLAG &&
             pRevPara && pRevPara->cbSize >= offsetof(CERT_REVOCATION_PARA,
             dwUrlRetrievalTimeout) + sizeof(DWORD))
            {
                startTime = GetTickCount();
                endTime = startTime + pRevPara->dwUrlRetrievalTimeout;
                timeout = pRevPara->dwUrlRetrievalTimeout;
            }
            else
                endTime = timeout = 0;
            if (!ret)
                error = GetLastError();
            for (j = 0; !error && j < urlArray->cUrl; j++)
            {
                PCCRL_CONTEXT crl;

                ret = CryptRetrieveObjectByUrlW(urlArray->rgwszUrl[j],
                 CONTEXT_OID_CRL, retrievalFlags, timeout, (void **)&crl,
                 NULL, NULL, NULL, NULL);
                if (ret)
                {
                    error = verify_cert_revocation_with_crl_online(cert, crl,
                     index, pTime, pRevStatus);
                    if (!error && timeout)
                    {
                        DWORD time = GetTickCount();

                        if ((int)(endTime - time) <= 0)
                        {
                            error = ERROR_TIMEOUT;
                            pRevStatus->dwIndex = index;
                        }
                        else
                            timeout = endTime - time;
                    }
                    CertFreeCRLContext(crl);
                }
                else
                    error = CRYPT_E_REVOCATION_OFFLINE;
            }
            CryptMemFree(urlArray);
        }
        else
        {
            error = ERROR_OUTOFMEMORY;
            pRevStatus->dwIndex = index;
        }
    }
    else
    {
        error = GetLastError();
        pRevStatus->dwIndex = index;
    }
    return error;
}

static DWORD verify_cert_revocation_from_aia_ext(
 const CRYPT_DATA_BLOB *value, PCCERT_CONTEXT cert, DWORD index,
 FILETIME *pTime, DWORD dwFlags, PCERT_REVOCATION_PARA pRevPara,
 PCERT_REVOCATION_STATUS pRevStatus)
{
    BOOL ret;
    DWORD error, size;
    CERT_AUTHORITY_INFO_ACCESS *aia;

    ret = CryptDecodeObjectEx(X509_ASN_ENCODING, X509_AUTHORITY_INFO_ACCESS,
     value->pbData, value->cbData, CRYPT_DECODE_ALLOC_FLAG, NULL, &aia, &size);
    if (ret)
    {
        DWORD i;

        for (i = 0; i < aia->cAccDescr; i++)
            if (!strcmp(aia->rgAccDescr[i].pszAccessMethod,
             szOID_PKIX_OCSP))
            {
                if (aia->rgAccDescr[i].AccessLocation.dwAltNameChoice ==
                 CERT_ALT_NAME_URL)
                    FIXME("OCSP URL = %s\n",
                     debugstr_w(aia->rgAccDescr[i].AccessLocation.u.pwszURL));
                else
                    FIXME("unsupported AccessLocation type %d\n",
                     aia->rgAccDescr[i].AccessLocation.dwAltNameChoice);
            }
        LocalFree(aia);
        /* FIXME: lie and pretend OCSP validated the cert */
        error = ERROR_SUCCESS;
    }
    else
        error = GetLastError();
    return error;
}

static DWORD verify_cert_revocation_with_crl_offline(PCCERT_CONTEXT cert,
 PCCRL_CONTEXT crl, DWORD index, FILETIME *pTime,
 PCERT_REVOCATION_STATUS pRevStatus)
{
    DWORD error;
    LONG valid;

    valid = CompareFileTime(pTime, &crl->pCrlInfo->ThisUpdate);
    if (valid <= 0)
    {
        /* If this CRL is not older than the time being verified, there's no
         * way to know whether the certificate was revoked.
         */
        TRACE("CRL not old enough\n");
        error = CRYPT_E_REVOCATION_OFFLINE;
    }
    else
    {
        PCRL_ENTRY entry = NULL;

        CertFindCertificateInCRL(cert, crl, 0, NULL, &entry);
        if (entry)
        {
            error = CRYPT_E_REVOKED;
            pRevStatus->dwIndex = index;
        }
        else
        {
            /* Since the CRL was not retrieved for the cert being checked,
             * there's no guarantee it's fresh, so the cert *might* be okay,
             * but it's safer not to guess.
             */
            TRACE("certificate not found\n");
            error = CRYPT_E_REVOCATION_OFFLINE;
        }
    }
    return error;
}

static DWORD verify_cert_revocation(PCCERT_CONTEXT cert, DWORD index,
 FILETIME *pTime, DWORD dwFlags, PCERT_REVOCATION_PARA pRevPara,
 PCERT_REVOCATION_STATUS pRevStatus)
{
    DWORD error = ERROR_SUCCESS;
    PCERT_EXTENSION ext;

    if ((ext = CertFindExtension(szOID_CRL_DIST_POINTS,
     cert->pCertInfo->cExtension, cert->pCertInfo->rgExtension)))
        error = verify_cert_revocation_from_dist_points_ext(&ext->Value, cert,
         index, pTime, dwFlags, pRevPara, pRevStatus);
    else if ((ext = CertFindExtension(szOID_AUTHORITY_INFO_ACCESS,
     cert->pCertInfo->cExtension, cert->pCertInfo->rgExtension)))
        error = verify_cert_revocation_from_aia_ext(&ext->Value, cert,
         index, pTime, dwFlags, pRevPara, pRevStatus);
    else
    {
        if (pRevPara && pRevPara->hCrlStore && pRevPara->pIssuerCert)
        {
            PCCRL_CONTEXT crl = NULL;
            BOOL canSignCRLs;

            /* If the caller told us about the issuer, make sure the issuer
             * can sign CRLs before looking for one.
             */
            if ((ext = CertFindExtension(szOID_KEY_USAGE,
             pRevPara->pIssuerCert->pCertInfo->cExtension,
             pRevPara->pIssuerCert->pCertInfo->rgExtension)))
            {
                CRYPT_BIT_BLOB usage;
                DWORD size = sizeof(usage);

                if (!CryptDecodeObjectEx(cert->dwCertEncodingType, X509_BITS,
                 ext->Value.pbData, ext->Value.cbData,
                 CRYPT_DECODE_NOCOPY_FLAG, NULL, &usage, &size))
                    canSignCRLs = FALSE;
                else if (usage.cbData > 2)
                {
                    /* The key usage extension only defines 9 bits => no more
                     * than 2 bytes are needed to encode all known usages.
                     */
                    canSignCRLs = FALSE;
                }
                else
                {
                    BYTE usageBits = usage.pbData[usage.cbData - 1];

                    canSignCRLs = usageBits & CERT_CRL_SIGN_KEY_USAGE;
                }
            }
            else
                canSignCRLs = TRUE;
            if (canSignCRLs)
            {
                /* If the caller was helpful enough to tell us where to find a
                 * CRL for the cert, look for one and check it.
                 */
                crl = CertFindCRLInStore(pRevPara->hCrlStore,
                 cert->dwCertEncodingType,
                 CRL_FIND_ISSUED_BY_SIGNATURE_FLAG |
                 CRL_FIND_ISSUED_BY_AKI_FLAG,
                 CRL_FIND_ISSUED_BY, pRevPara->pIssuerCert, NULL);
            }
            if (crl)
            {
                error = verify_cert_revocation_with_crl_offline(cert, crl,
                 index, pTime, pRevStatus);
                CertFreeCRLContext(crl);
            }
            else
            {
                TRACE("no CRL found\n");
                error = CRYPT_E_NO_REVOCATION_CHECK;
                pRevStatus->dwIndex = index;
            }
        }
        else
        {
            if (!pRevPara)
                WARN("no CERT_REVOCATION_PARA\n");
            else if (!pRevPara->hCrlStore)
                WARN("no dist points/aia extension and no CRL store\n");
            else if (!pRevPara->pIssuerCert)
                WARN("no dist points/aia extension and no issuer\n");
            error = CRYPT_E_NO_REVOCATION_CHECK;
            pRevStatus->dwIndex = index;
        }
    }
    return error;
}

typedef struct _CERT_REVOCATION_PARA_NO_EXTRA_FIELDS {
    DWORD                     cbSize;
    PCCERT_CONTEXT            pIssuerCert;
    DWORD                     cCertStore;
    HCERTSTORE               *rgCertStore;
    HCERTSTORE                hCrlStore;
    LPFILETIME                pftTimeToUse;
} CERT_REVOCATION_PARA_NO_EXTRA_FIELDS, *PCERT_REVOCATION_PARA_NO_EXTRA_FIELDS;

typedef struct _OLD_CERT_REVOCATION_STATUS {
    DWORD cbSize;
    DWORD dwIndex;
    DWORD dwError;
    DWORD dwReason;
} OLD_CERT_REVOCATION_STATUS, *POLD_CERT_REVOCATION_STATUS;

/***********************************************************************
 *    CertDllVerifyRevocation (CRYPTNET.@)
 */
BOOL WINAPI CertDllVerifyRevocation(DWORD dwEncodingType, DWORD dwRevType,
 DWORD cContext, PVOID rgpvContext[], DWORD dwFlags,
 PCERT_REVOCATION_PARA pRevPara, PCERT_REVOCATION_STATUS pRevStatus)
{
    DWORD error = 0, i;
    FILETIME now;
    LPFILETIME pTime = NULL;

    TRACE("(%08x, %d, %d, %p, %08x, %p, %p)\n", dwEncodingType, dwRevType,
     cContext, rgpvContext, dwFlags, pRevPara, pRevStatus);

    if (pRevStatus->cbSize != sizeof(OLD_CERT_REVOCATION_STATUS) &&
     pRevStatus->cbSize != sizeof(CERT_REVOCATION_STATUS))
    {
        SetLastError(E_INVALIDARG);
        return FALSE;
    }
    if (!cContext)
    {
        SetLastError(E_INVALIDARG);
        return FALSE;
    }
    if (pRevPara && pRevPara->cbSize >=
     sizeof(CERT_REVOCATION_PARA_NO_EXTRA_FIELDS))
        pTime = pRevPara->pftTimeToUse;
    if (!pTime)
    {
        GetSystemTimeAsFileTime(&now);
        pTime = &now;
    }
    memset(&pRevStatus->dwIndex, 0, pRevStatus->cbSize - sizeof(DWORD));
    if (dwRevType != CERT_CONTEXT_REVOCATION_TYPE)
        error = CRYPT_E_NO_REVOCATION_CHECK;
    else
    {
        for (i = 0; !error && i < cContext; i++)
            error = verify_cert_revocation(rgpvContext[i], i, pTime, dwFlags,
             pRevPara, pRevStatus);
    }
    if (error)
    {
        SetLastError(error);
        pRevStatus->dwError = error;
    }
    TRACE("returning %d (%08x)\n", !error, error);
    return !error;
}