wine/dlls/crypt32/cert.c

/*
 * Copyright 2004-2006 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 <assert.h>
#include <stdarg.h>
#include "windef.h"
#include "winbase.h"
#include "wincrypt.h"
#include "winnls.h"
#include "rpc.h"
#include "wine/debug.h"
#include "crypt32_private.h"

WINE_DEFAULT_DEBUG_CHANNEL(crypt);

/* Internal version of CertGetCertificateContextProperty that gets properties
 * directly from the context (or the context it's linked to, depending on its
 * type.) Doesn't handle special-case properties, since they are handled by
 * CertGetCertificateContextProperty, and are particular to the store in which
 * the property exists (which is separate from the context.)
 */
static BOOL WINAPI CertContext_GetProperty(void *context, DWORD dwPropId,
 void *pvData, DWORD *pcbData);

/* Internal version of CertSetCertificateContextProperty that sets properties
 * directly on the context (or the context it's linked to, depending on its
 * type.) Doesn't handle special cases, since they're handled by
 * CertSetCertificateContextProperty anyway.
 */
static BOOL WINAPI CertContext_SetProperty(void *context, DWORD dwPropId,
 DWORD dwFlags, const void *pvData);

BOOL WINAPI CertAddEncodedCertificateToStore(HCERTSTORE hCertStore,
 DWORD dwCertEncodingType, const BYTE *pbCertEncoded, DWORD cbCertEncoded,
 DWORD dwAddDisposition, PCCERT_CONTEXT *ppCertContext)
{
    PCCERT_CONTEXT cert = CertCreateCertificateContext(dwCertEncodingType,
     pbCertEncoded, cbCertEncoded);
    BOOL ret;

    TRACE("(%p, %08lx, %p, %ld, %08lx, %p)\n", hCertStore, dwCertEncodingType,
     pbCertEncoded, cbCertEncoded, dwAddDisposition, ppCertContext);

    if (cert)
    {
        ret = CertAddCertificateContextToStore(hCertStore, cert,
         dwAddDisposition, ppCertContext);
        CertFreeCertificateContext(cert);
    }
    else
        ret = FALSE;
    return ret;
}

PCCERT_CONTEXT WINAPI CertCreateCertificateContext(DWORD dwCertEncodingType,
 const BYTE *pbCertEncoded, DWORD cbCertEncoded)
{
    PCERT_CONTEXT cert = NULL;
    BOOL ret;
    PCERT_INFO certInfo = NULL;
    DWORD size = 0;

    TRACE("(%08lx, %p, %ld)\n", dwCertEncodingType, pbCertEncoded,
     cbCertEncoded);

    ret = CryptDecodeObjectEx(dwCertEncodingType, X509_CERT_TO_BE_SIGNED,
     pbCertEncoded, cbCertEncoded, CRYPT_DECODE_ALLOC_FLAG, NULL,
     (BYTE *)&certInfo, &size);
    if (ret)
    {
        BYTE *data = NULL;

        cert = (PCERT_CONTEXT)Context_CreateDataContext(sizeof(CERT_CONTEXT));
        if (!cert)
            goto end;
        data = CryptMemAlloc(cbCertEncoded);
        if (!data)
        {
            CryptMemFree(cert);
            cert = NULL;
            goto end;
        }
        memcpy(data, pbCertEncoded, cbCertEncoded);
        cert->dwCertEncodingType = dwCertEncodingType;
        cert->pbCertEncoded      = data;
        cert->cbCertEncoded      = cbCertEncoded;
        cert->pCertInfo          = certInfo;
        cert->hCertStore         = 0;
    }

end:
    return (PCCERT_CONTEXT)cert;
}

PCCERT_CONTEXT WINAPI CertDuplicateCertificateContext(
 PCCERT_CONTEXT pCertContext)
{
    TRACE("(%p)\n", pCertContext);
    Context_AddRef((void *)pCertContext, sizeof(CERT_CONTEXT));
    return pCertContext;
}

static void CertDataContext_Free(void *context)
{
    PCERT_CONTEXT certContext = (PCERT_CONTEXT)context;

    CryptMemFree(certContext->pbCertEncoded);
    LocalFree(certContext->pCertInfo);
}

BOOL WINAPI CertFreeCertificateContext(PCCERT_CONTEXT pCertContext)
{
    TRACE("(%p)\n", pCertContext);

    if (pCertContext)
        Context_Release((void *)pCertContext, sizeof(CERT_CONTEXT),
         CertDataContext_Free);
    return TRUE;
}

DWORD WINAPI CertEnumCertificateContextProperties(PCCERT_CONTEXT pCertContext,
 DWORD dwPropId)
{
    PCONTEXT_PROPERTY_LIST properties = Context_GetProperties(
     (void *)pCertContext, sizeof(CERT_CONTEXT));
    DWORD ret;

    TRACE("(%p, %ld)\n", pCertContext, dwPropId);

    if (properties)
        ret = ContextPropertyList_EnumPropIDs(properties, dwPropId);
    else
        ret = 0;
    return ret;
}

static BOOL CertContext_GetHashProp(void *context, DWORD dwPropId,
 ALG_ID algID, const BYTE *toHash, DWORD toHashLen, void *pvData,
 DWORD *pcbData)
{
    BOOL ret = CryptHashCertificate(0, algID, 0, toHash, toHashLen, pvData,
     pcbData);
    if (ret)
    {
        CRYPT_DATA_BLOB blob = { *pcbData, pvData };

        ret = CertContext_SetProperty(context, dwPropId, 0, &blob);
    }
    return ret;
}

static BOOL WINAPI CertContext_GetProperty(void *context, DWORD dwPropId,
 void *pvData, DWORD *pcbData)
{
    PCCERT_CONTEXT pCertContext = (PCCERT_CONTEXT)context;
    PCONTEXT_PROPERTY_LIST properties =
     Context_GetProperties(context, sizeof(CERT_CONTEXT));
    BOOL ret;
    CRYPT_DATA_BLOB blob;

    TRACE("(%p, %ld, %p, %p)\n", context, dwPropId, pvData, pcbData);

    if (properties)
        ret = ContextPropertyList_FindProperty(properties, dwPropId, &blob);
    else
        ret = FALSE;
    if (ret)
    {
        if (!pvData)
        {
            *pcbData = blob.cbData;
            ret = TRUE;
        }
        else if (*pcbData < blob.cbData)
        {
            SetLastError(ERROR_MORE_DATA);
            *pcbData = blob.cbData;
        }
        else
        {
            memcpy(pvData, blob.pbData, blob.cbData);
            *pcbData = blob.cbData;
            ret = TRUE;
        }
    }
    else
    {
        /* Implicit properties */
        switch (dwPropId)
        {
        case CERT_SHA1_HASH_PROP_ID:
            ret = CertContext_GetHashProp(context, dwPropId, CALG_SHA1,
             pCertContext->pbCertEncoded, pCertContext->cbCertEncoded, pvData,
             pcbData);
            break;
        case CERT_MD5_HASH_PROP_ID:
            ret = CertContext_GetHashProp(context, dwPropId, CALG_MD5,
             pCertContext->pbCertEncoded, pCertContext->cbCertEncoded, pvData,
             pcbData);
            break;
        case CERT_SUBJECT_NAME_MD5_HASH_PROP_ID:
            ret = CertContext_GetHashProp(context, dwPropId, CALG_MD5,
             pCertContext->pCertInfo->Subject.pbData,
             pCertContext->pCertInfo->Subject.cbData,
             pvData, pcbData);
            break;
        case CERT_SUBJECT_PUBLIC_KEY_MD5_HASH_PROP_ID:
            ret = CertContext_GetHashProp(context, dwPropId, CALG_MD5,
             pCertContext->pCertInfo->SubjectPublicKeyInfo.PublicKey.pbData,
             pCertContext->pCertInfo->SubjectPublicKeyInfo.PublicKey.cbData,
             pvData, pcbData);
            break;
        case CERT_ISSUER_SERIAL_NUMBER_MD5_HASH_PROP_ID:
            ret = CertContext_GetHashProp(context, dwPropId, CALG_MD5,
             pCertContext->pCertInfo->SerialNumber.pbData,
             pCertContext->pCertInfo->SerialNumber.cbData,
             pvData, pcbData);
            break;
        case CERT_SIGNATURE_HASH_PROP_ID:
            FIXME("CERT_SIGNATURE_HASH_PROP_ID unimplemented\n");
            SetLastError(CRYPT_E_NOT_FOUND);
            break;
        default:
            SetLastError(CRYPT_E_NOT_FOUND);
        }
    }
    TRACE("returning %d\n", ret);
    return ret;
}

/* info is assumed to be a CRYPT_KEY_PROV_INFO, followed by its container name,
 * provider name, and any provider parameters, in a contiguous buffer, but
 * where info's pointers are assumed to be invalid.  Upon return, info's
 * pointers point to the appropriate memory locations.
 */
static void CRYPT_FixKeyProvInfoPointers(PCRYPT_KEY_PROV_INFO info)
{
    DWORD i, containerLen, provNameLen;
    LPBYTE data = (LPBYTE)info + sizeof(CRYPT_KEY_PROV_INFO);

    info->pwszContainerName = (LPWSTR)data;
    containerLen = (lstrlenW(info->pwszContainerName) + 1) * sizeof(WCHAR);
    data += containerLen;

    info->pwszProvName = (LPWSTR)data;
    provNameLen = (lstrlenW(info->pwszProvName) + 1) * sizeof(WCHAR);
    data += provNameLen;

    info->rgProvParam = (PCRYPT_KEY_PROV_PARAM)data;
    data += info->cProvParam * sizeof(CRYPT_KEY_PROV_PARAM);

    for (i = 0; i < info->cProvParam; i++)
    {
        info->rgProvParam[i].pbData = data;
        data += info->rgProvParam[i].cbData;
    }
}

BOOL WINAPI CertGetCertificateContextProperty(PCCERT_CONTEXT pCertContext,
 DWORD dwPropId, void *pvData, DWORD *pcbData)
{
    BOOL ret;

    TRACE("(%p, %ld, %p, %p)\n", pCertContext, dwPropId, pvData, pcbData);

    switch (dwPropId)
    {
    case 0:
    case CERT_CERT_PROP_ID:
    case CERT_CRL_PROP_ID:
    case CERT_CTL_PROP_ID:
        SetLastError(E_INVALIDARG);
        ret = FALSE;
        break;
    case CERT_ACCESS_STATE_PROP_ID:
        if (!pvData)
        {
            *pcbData = sizeof(DWORD);
            ret = TRUE;
        }
        else if (*pcbData < sizeof(DWORD))
        {
            SetLastError(ERROR_MORE_DATA);
            *pcbData = sizeof(DWORD);
            ret = FALSE;
        }
        else
        {
            *(DWORD *)pvData =
             CertStore_GetAccessState(pCertContext->hCertStore);
            ret = TRUE;
        }
        break;
    case CERT_KEY_IDENTIFIER_PROP_ID:
        ret = CertContext_GetProperty((void *)pCertContext, dwPropId,
         pvData, pcbData);
        if (!ret)
            SetLastError(ERROR_INVALID_DATA);
        break;
    case CERT_KEY_PROV_HANDLE_PROP_ID:
    {
        CERT_KEY_CONTEXT keyContext;
        DWORD size = sizeof(keyContext);

        ret = CertContext_GetProperty((void *)pCertContext,
         CERT_KEY_CONTEXT_PROP_ID, &keyContext, &size);
        if (ret)
        {
            if (!pvData)
            {
                *pcbData = sizeof(HCRYPTPROV);
                ret = TRUE;
            }
            else if (*pcbData < sizeof(HCRYPTPROV))
            {
                SetLastError(ERROR_MORE_DATA);
                *pcbData = sizeof(HCRYPTPROV);
                ret = FALSE;
            }
            else
            {
                *(HCRYPTPROV *)pvData = keyContext.hCryptProv;
                ret = TRUE;
            }
        }
        break;
    }
    case CERT_KEY_PROV_INFO_PROP_ID:
        ret = CertContext_GetProperty((void *)pCertContext, dwPropId, pvData,
         pcbData);
        if (ret && pvData)
            CRYPT_FixKeyProvInfoPointers((PCRYPT_KEY_PROV_INFO)pvData);
        break;
    default:
        ret = CertContext_GetProperty((void *)pCertContext, dwPropId, pvData,
         pcbData);
    }

    TRACE("returning %d\n", ret);
    return ret;
}

/* Copies key provider info from from into to, where to is assumed to be a
 * contiguous buffer of memory large enough for from and all its associated
 * data, but whose pointers are uninitialized.
 * Upon return, to contains a contiguous copy of from, packed in the following
 * order:
 * - CRYPT_KEY_PROV_INFO
 * - pwszContainerName
 * - pwszProvName
 * - rgProvParam[0]...
 */
static void CRYPT_CopyKeyProvInfo(PCRYPT_KEY_PROV_INFO to,
 PCRYPT_KEY_PROV_INFO from)
{
    DWORD i;
    LPBYTE nextData = (LPBYTE)to + sizeof(CRYPT_KEY_PROV_INFO);

    to->pwszContainerName = (LPWSTR)nextData;
    lstrcpyW(to->pwszContainerName, from->pwszContainerName);
    nextData += (lstrlenW(from->pwszContainerName) + 1) * sizeof(WCHAR);
    to->pwszProvName = (LPWSTR)nextData;
    lstrcpyW(to->pwszProvName, from->pwszProvName);
    nextData += (lstrlenW(from->pwszProvName) + 1) * sizeof(WCHAR);
    to->dwProvType = from->dwProvType;
    to->dwFlags = from->dwFlags;
    to->cProvParam = from->cProvParam;
    to->rgProvParam = (PCRYPT_KEY_PROV_PARAM)nextData;
    nextData += to->cProvParam * sizeof(CRYPT_KEY_PROV_PARAM);
    to->dwKeySpec = from->dwKeySpec;
    for (i = 0; i < to->cProvParam; i++)
    {
        memcpy(&to->rgProvParam[i], &from->rgProvParam[i],
         sizeof(CRYPT_KEY_PROV_PARAM));
        to->rgProvParam[i].pbData = nextData;
        memcpy(to->rgProvParam[i].pbData, from->rgProvParam[i].pbData,
         from->rgProvParam[i].cbData);
        nextData += from->rgProvParam[i].cbData;
    }
}

static BOOL CertContext_SetKeyProvInfoProperty(PCONTEXT_PROPERTY_LIST properties,
 PCRYPT_KEY_PROV_INFO info)
{
    BOOL ret;
    LPBYTE buf = NULL;
    DWORD size = sizeof(CRYPT_KEY_PROV_INFO), i, containerSize, provNameSize;

    containerSize = (lstrlenW(info->pwszContainerName) + 1) * sizeof(WCHAR);
    provNameSize = (lstrlenW(info->pwszProvName) + 1) * sizeof(WCHAR);
    size += containerSize + provNameSize;
    for (i = 0; i < info->cProvParam; i++)
        size += sizeof(CRYPT_KEY_PROV_PARAM) + info->rgProvParam[i].cbData;
    buf = CryptMemAlloc(size);
    if (buf)
    {
        CRYPT_CopyKeyProvInfo((PCRYPT_KEY_PROV_INFO)buf, info);
        ret = ContextPropertyList_SetProperty(properties,
         CERT_KEY_PROV_INFO_PROP_ID, buf, size);
        CryptMemFree(buf);
    }
    else
        ret = FALSE;
    return ret;
}

static BOOL WINAPI CertContext_SetProperty(void *context, DWORD dwPropId,
 DWORD dwFlags, const void *pvData)
{
    PCONTEXT_PROPERTY_LIST properties =
     Context_GetProperties(context, sizeof(CERT_CONTEXT));
    BOOL ret;

    TRACE("(%p, %ld, %08lx, %p)\n", context, dwPropId, dwFlags, pvData);

    if (!properties)
        ret = FALSE;
    else
    {
        switch (dwPropId)
        {
        case CERT_AUTO_ENROLL_PROP_ID:
        case CERT_CTL_USAGE_PROP_ID: /* same as CERT_ENHKEY_USAGE_PROP_ID */
        case CERT_DESCRIPTION_PROP_ID:
        case CERT_FRIENDLY_NAME_PROP_ID:
        case CERT_HASH_PROP_ID:
        case CERT_KEY_IDENTIFIER_PROP_ID:
        case CERT_MD5_HASH_PROP_ID:
        case CERT_NEXT_UPDATE_LOCATION_PROP_ID:
        case CERT_PUBKEY_ALG_PARA_PROP_ID:
        case CERT_PVK_FILE_PROP_ID:
        case CERT_SIGNATURE_HASH_PROP_ID:
        case CERT_ISSUER_PUBLIC_KEY_MD5_HASH_PROP_ID:
        case CERT_SUBJECT_NAME_MD5_HASH_PROP_ID:
        case CERT_SUBJECT_PUBLIC_KEY_MD5_HASH_PROP_ID:
        case CERT_ENROLLMENT_PROP_ID:
        case CERT_CROSS_CERT_DIST_POINTS_PROP_ID:
        case CERT_RENEWAL_PROP_ID:
        {
            if (pvData)
            {
                PCRYPT_DATA_BLOB blob = (PCRYPT_DATA_BLOB)pvData;

                ret = ContextPropertyList_SetProperty(properties, dwPropId,
                 blob->pbData, blob->cbData);
            }
            else
            {
                ContextPropertyList_RemoveProperty(properties, dwPropId);
                ret = TRUE;
            }
            break;
        }
        case CERT_DATE_STAMP_PROP_ID:
            if (pvData)
                ret = ContextPropertyList_SetProperty(properties, dwPropId,
                 (LPBYTE)pvData, sizeof(FILETIME));
            else
            {
                ContextPropertyList_RemoveProperty(properties, dwPropId);
                ret = TRUE;
            }
            break;
        case CERT_KEY_CONTEXT_PROP_ID:
        {
            if (pvData)
            {
                PCERT_KEY_CONTEXT keyContext = (PCERT_KEY_CONTEXT)pvData;

                ret = ContextPropertyList_SetProperty(properties, dwPropId,
                 (const BYTE *)keyContext, keyContext->cbSize);
            }
            else
            {
                ContextPropertyList_RemoveProperty(properties, dwPropId);
                ret = TRUE;
            }
            break;
        }
        case CERT_KEY_PROV_INFO_PROP_ID:
            if (pvData)
                ret = CertContext_SetKeyProvInfoProperty(properties,
                 (PCRYPT_KEY_PROV_INFO)pvData);
            else
            {
                ContextPropertyList_RemoveProperty(properties, dwPropId);
                ret = TRUE;
            }
            break;
        case CERT_KEY_PROV_HANDLE_PROP_ID:
        {
            CERT_KEY_CONTEXT keyContext;
            DWORD size = sizeof(keyContext);

            ret = CertContext_GetProperty(context, CERT_KEY_CONTEXT_PROP_ID,
             &keyContext, &size);
            if (ret)
            {
                if (!(dwFlags & CERT_STORE_NO_CRYPT_RELEASE_FLAG))
                    CryptReleaseContext(keyContext.hCryptProv, 0);
                if (pvData)
                    keyContext.hCryptProv = *(HCRYPTPROV *)pvData;
                else
                    keyContext.hCryptProv = 0;
                ret = CertContext_SetProperty(context, CERT_KEY_CONTEXT_PROP_ID,
                 0, &keyContext);
            }
            break;
        }
        default:
            FIXME("%ld: stub\n", dwPropId);
            ret = FALSE;
        }
    }
    TRACE("returning %d\n", ret);
    return ret;
}

BOOL WINAPI CertSetCertificateContextProperty(PCCERT_CONTEXT pCertContext,
 DWORD dwPropId, DWORD dwFlags, const void *pvData)
{
    BOOL ret;

    TRACE("(%p, %ld, %08lx, %p)\n", pCertContext, dwPropId, dwFlags, pvData);

    /* Handle special cases for "read-only"/invalid prop IDs.  Windows just
     * crashes on most of these, I'll be safer.
     */
    switch (dwPropId)
    {
    case 0:
    case CERT_ACCESS_STATE_PROP_ID:
    case CERT_CERT_PROP_ID:
    case CERT_CRL_PROP_ID:
    case CERT_CTL_PROP_ID:
        SetLastError(E_INVALIDARG);
        return FALSE;
    }
    ret = CertContext_SetProperty((void *)pCertContext, dwPropId, dwFlags,
     pvData);
    TRACE("returning %d\n", ret);
    return ret;
}

/* Acquires the private key using the key provider info, retrieving info from
 * the certificate if info is NULL.  The acquired provider is returned in
 * *phCryptProv, and the key spec for the provider is returned in *pdwKeySpec.
 */
static BOOL CRYPT_AcquirePrivateKeyFromProvInfo(PCCERT_CONTEXT pCert,
 PCRYPT_KEY_PROV_INFO info, HCRYPTPROV *phCryptProv, DWORD *pdwKeySpec)
{
    DWORD size = 0;
    BOOL allocated = FALSE, ret = TRUE;

    if (!info)
    {
        ret = CertGetCertificateContextProperty(pCert,
         CERT_KEY_PROV_INFO_PROP_ID, 0, &size);
        if (ret)
        {
            info = (PCRYPT_KEY_PROV_INFO)HeapAlloc(GetProcessHeap(), 0, size);
            if (info)
            {
                ret = CertGetCertificateContextProperty(pCert,
                 CERT_KEY_PROV_INFO_PROP_ID, info, &size);
                allocated = TRUE;
            }
        }
        else
            SetLastError(CRYPT_E_NO_KEY_PROPERTY);
    }
    if (ret)
    {
        ret = CryptAcquireContextW(phCryptProv, info->pwszContainerName,
         info->pwszProvName, info->dwProvType, 0);
        if (ret)
        {
            DWORD i;

            for (i = 0; i < info->cProvParam; i++)
            {
                CryptSetProvParam(*phCryptProv,
                 info->rgProvParam[i].dwParam, info->rgProvParam[i].pbData,
                 info->rgProvParam[i].dwFlags);
            }
            *pdwKeySpec = info->dwKeySpec;
        }
        else
            SetLastError(CRYPT_E_NO_KEY_PROPERTY);
    }
    if (allocated)
        HeapFree(GetProcessHeap(), 0, info);
    return ret;
}

BOOL WINAPI CryptAcquireCertificatePrivateKey(PCCERT_CONTEXT pCert,
 DWORD dwFlags, void *pvReserved, HCRYPTPROV *phCryptProv, DWORD *pdwKeySpec,
 BOOL *pfCallerFreeProv)
{
    BOOL ret = FALSE, cache = FALSE;
    PCRYPT_KEY_PROV_INFO info = NULL;
    CERT_KEY_CONTEXT keyContext;
    DWORD size;

    TRACE("(%p, %08lx, %p, %p, %p, %p)\n", pCert, dwFlags, pvReserved,
     phCryptProv, pdwKeySpec, pfCallerFreeProv);

    if (dwFlags & CRYPT_ACQUIRE_USE_PROV_INFO_FLAG)
    {
        DWORD size = 0;

        ret = CertGetCertificateContextProperty(pCert,
         CERT_KEY_PROV_INFO_PROP_ID, 0, &size);
        if (ret)
        {
            info = (PCRYPT_KEY_PROV_INFO)HeapAlloc(
             GetProcessHeap(), 0, size);
            ret = CertGetCertificateContextProperty(pCert,
             CERT_KEY_PROV_INFO_PROP_ID, info, &size);
            if (ret)
                cache = info->dwFlags & CERT_SET_KEY_CONTEXT_PROP_ID;
        }
    }
    else if (dwFlags & CRYPT_ACQUIRE_CACHE_FLAG)
        cache = TRUE;
    *phCryptProv = 0;
    if (cache)
    {
        size = sizeof(keyContext);
        ret = CertGetCertificateContextProperty(pCert, CERT_KEY_CONTEXT_PROP_ID,
         &keyContext, &size);
        if (ret)
        {
            *phCryptProv = keyContext.hCryptProv;
            if (pdwKeySpec)
                *pdwKeySpec = keyContext.dwKeySpec;
            if (pfCallerFreeProv)
                *pfCallerFreeProv = !cache;
        }
    }
    if (!*phCryptProv)
    {
        ret = CRYPT_AcquirePrivateKeyFromProvInfo(pCert, info,
         &keyContext.hCryptProv, &keyContext.dwKeySpec);
        if (ret)
        {
            *phCryptProv = keyContext.hCryptProv;
            if (pdwKeySpec)
                *pdwKeySpec = keyContext.dwKeySpec;
            if (cache)
            {
                keyContext.cbSize = sizeof(keyContext);
                if (CertSetCertificateContextProperty(pCert,
                 CERT_KEY_CONTEXT_PROP_ID, 0, &keyContext))
                {
                    if (pfCallerFreeProv)
                        *pfCallerFreeProv = FALSE;
                }
            }
            else
            {
                if (pfCallerFreeProv)
                    *pfCallerFreeProv = TRUE;
            }
        }
    }
    HeapFree(GetProcessHeap(), 0, info);
    return ret;
}

BOOL WINAPI CertCompareCertificate(DWORD dwCertEncodingType,
 PCERT_INFO pCertId1, PCERT_INFO pCertId2)
{
    TRACE("(%08lx, %p, %p)\n", dwCertEncodingType, pCertId1, pCertId2);

    return CertCompareCertificateName(dwCertEncodingType, &pCertId1->Issuer,
     &pCertId2->Issuer) && CertCompareIntegerBlob(&pCertId1->SerialNumber,
     &pCertId2->SerialNumber);
}

BOOL WINAPI CertCompareCertificateName(DWORD dwCertEncodingType,
 PCERT_NAME_BLOB pCertName1, PCERT_NAME_BLOB pCertName2)
{
    BOOL ret;

    TRACE("(%08lx, %p, %p)\n", dwCertEncodingType, pCertName1, pCertName2);

    if (pCertName1->cbData == pCertName2->cbData)
    {
        if (pCertName1->cbData)
            ret = !memcmp(pCertName1->pbData, pCertName2->pbData,
             pCertName1->cbData);
        else
            ret = TRUE;
    }
    else
        ret = FALSE;
    return ret;
}

/* Returns the number of significant bytes in pInt, where a byte is
 * insignificant if it's a leading 0 for positive numbers or a leading 0xff
 * for negative numbers.  pInt is assumed to be little-endian.
 */
static DWORD CRYPT_significantBytes(PCRYPT_INTEGER_BLOB pInt)
{
    DWORD ret = pInt->cbData;

    while (ret > 1)
    {
        if (pInt->pbData[ret - 2] <= 0x7f && pInt->pbData[ret - 1] == 0)
            ret--;
        else if (pInt->pbData[ret - 2] >= 0x80 && pInt->pbData[ret - 1] == 0xff)
            ret--;
        else
            break;
    }
    return ret;
}

BOOL WINAPI CertCompareIntegerBlob(PCRYPT_INTEGER_BLOB pInt1,
 PCRYPT_INTEGER_BLOB pInt2)
{
    BOOL ret;
    DWORD cb1, cb2;

    TRACE("(%p, %p)\n", pInt1, pInt2);

    cb1 = CRYPT_significantBytes(pInt1);
    cb2 = CRYPT_significantBytes(pInt2);
    if (cb1 == cb2)
    {
        if (cb1)
            ret = !memcmp(pInt1->pbData, pInt1->pbData, cb1);
        else
            ret = TRUE;
    }
    else
        ret = FALSE;
    return ret;
}

BOOL WINAPI CertComparePublicKeyInfo(DWORD dwCertEncodingType,
 PCERT_PUBLIC_KEY_INFO pPublicKey1, PCERT_PUBLIC_KEY_INFO pPublicKey2)
{
    BOOL ret;

    TRACE("(%08lx, %p, %p)\n", dwCertEncodingType, pPublicKey1, pPublicKey2);

    if (pPublicKey1->PublicKey.cbData == pPublicKey2->PublicKey.cbData &&
     pPublicKey1->PublicKey.cUnusedBits == pPublicKey2->PublicKey.cUnusedBits)
    {
        if (pPublicKey2->PublicKey.cbData)
            ret = !memcmp(pPublicKey1->PublicKey.pbData,
             pPublicKey2->PublicKey.pbData, pPublicKey1->PublicKey.cbData);
        else
            ret = TRUE;
    }
    else
        ret = FALSE;
    return ret;
}

typedef BOOL (*CertCompareFunc)(PCCERT_CONTEXT pCertContext, DWORD dwType,
 DWORD dwFlags, const void *pvPara);

static BOOL compare_cert_any(PCCERT_CONTEXT pCertContext, DWORD dwType,
 DWORD dwFlags, const void *pvPara)
{
    return TRUE;
}

static BOOL compare_cert_by_md5_hash(PCCERT_CONTEXT pCertContext, DWORD dwType,
 DWORD dwFlags, const void *pvPara)
{
    BOOL ret;
    BYTE hash[16];
    DWORD size = sizeof(hash);

    ret = CertGetCertificateContextProperty(pCertContext,
     CERT_MD5_HASH_PROP_ID, hash, &size);
    if (ret)
    {
        const CRYPT_HASH_BLOB *pHash = (const CRYPT_HASH_BLOB *)pvPara;

        if (size == pHash->cbData)
            ret = !memcmp(pHash->pbData, hash, size);
        else
            ret = FALSE;
    }
    return ret;
}

static BOOL compare_cert_by_sha1_hash(PCCERT_CONTEXT pCertContext, DWORD dwType,
 DWORD dwFlags, const void *pvPara)
{
    BOOL ret;
    BYTE hash[20];
    DWORD size = sizeof(hash);

    ret = CertGetCertificateContextProperty(pCertContext,
     CERT_SHA1_HASH_PROP_ID, hash, &size);
    if (ret)
    {
        const CRYPT_HASH_BLOB *pHash = (const CRYPT_HASH_BLOB *)pvPara;

        if (size == pHash->cbData)
            ret = !memcmp(pHash->pbData, hash, size);
        else
            ret = FALSE;
    }
    return ret;
}

static BOOL compare_cert_by_name(PCCERT_CONTEXT pCertContext, DWORD dwType,
 DWORD dwFlags, const void *pvPara)
{
    CERT_NAME_BLOB *blob = (CERT_NAME_BLOB *)pvPara, *toCompare;
    BOOL ret;

    if (dwType & CERT_INFO_SUBJECT_FLAG)
        toCompare = &pCertContext->pCertInfo->Subject;
    else
        toCompare = &pCertContext->pCertInfo->Issuer;
    ret = CertCompareCertificateName(pCertContext->dwCertEncodingType,
     toCompare, blob);
    return ret;
}

static BOOL compare_cert_by_subject_cert(PCCERT_CONTEXT pCertContext,
 DWORD dwType, DWORD dwFlags, const void *pvPara)
{
    CERT_INFO *pCertInfo = (CERT_INFO *)pvPara;

    return CertCompareCertificateName(pCertContext->dwCertEncodingType,
     &pCertInfo->Issuer, &pCertContext->pCertInfo->Subject);
}

static BOOL compare_cert_by_issuer(PCCERT_CONTEXT pCertContext,
 DWORD dwType, DWORD dwFlags, const void *pvPara)
{
    return compare_cert_by_subject_cert(pCertContext, dwType, dwFlags,
     ((PCCERT_CONTEXT)pvPara)->pCertInfo);
}

PCCERT_CONTEXT WINAPI CertFindCertificateInStore(HCERTSTORE hCertStore,
 DWORD dwCertEncodingType, DWORD dwFlags, DWORD dwType, const void *pvPara,
 PCCERT_CONTEXT pPrevCertContext)
{
    PCCERT_CONTEXT ret;
    CertCompareFunc compare;

    TRACE("(%p, %ld, %ld, %ld, %p, %p)\n", hCertStore, dwCertEncodingType,
	 dwFlags, dwType, pvPara, pPrevCertContext);

    switch (dwType >> CERT_COMPARE_SHIFT)
    {
    case CERT_COMPARE_ANY:
        compare = compare_cert_any;
        break;
    case CERT_COMPARE_MD5_HASH:
        compare = compare_cert_by_md5_hash;
        break;
    case CERT_COMPARE_SHA1_HASH:
        compare = compare_cert_by_sha1_hash;
        break;
    case CERT_COMPARE_NAME:
        compare = compare_cert_by_name;
        break;
    case CERT_COMPARE_SUBJECT_CERT:
        compare = compare_cert_by_subject_cert;
        break;
    case CERT_COMPARE_ISSUER_OF:
        compare = compare_cert_by_issuer;
        break;
    default:
        FIXME("find type %08lx unimplemented\n", dwType);
        compare = NULL;
    }

    if (compare)
    {
        BOOL matches = FALSE;

        ret = pPrevCertContext;
        do {
            ret = CertEnumCertificatesInStore(hCertStore, ret);
            if (ret)
                matches = compare(ret, dwType, dwFlags, pvPara);
        } while (ret != NULL && !matches);
        if (!ret)
            SetLastError(CRYPT_E_NOT_FOUND);
    }
    else
    {
        SetLastError(CRYPT_E_NOT_FOUND);
        ret = NULL;
    }
    return ret;
}

PCCERT_CONTEXT WINAPI CertGetSubjectCertificateFromStore(HCERTSTORE hCertStore,
 DWORD dwCertEncodingType, PCERT_INFO pCertId)
{
    TRACE("(%p, %08lx, %p)\n", hCertStore, dwCertEncodingType, pCertId);

    if (!pCertId)
    {
        SetLastError(E_INVALIDARG);
        return NULL;
    }
    return CertFindCertificateInStore(hCertStore, dwCertEncodingType, 0,
     CERT_FIND_SUBJECT_CERT, pCertId, NULL);
}

BOOL WINAPI CertVerifySubjectCertificateContext(PCCERT_CONTEXT pSubject,
 PCCERT_CONTEXT pIssuer, DWORD *pdwFlags)
{
    static const DWORD supportedFlags = CERT_STORE_REVOCATION_FLAG |
     CERT_STORE_SIGNATURE_FLAG | CERT_STORE_TIME_VALIDITY_FLAG;

    if (*pdwFlags & ~supportedFlags)
    {
        SetLastError(E_INVALIDARG);
        return FALSE;
    }
    if (*pdwFlags & CERT_STORE_REVOCATION_FLAG)
    {
        DWORD flags = 0;
        PCCRL_CONTEXT crl = CertGetCRLFromStore(pSubject->hCertStore, pSubject,
         NULL, &flags);

        /* FIXME: what if the CRL has expired? */
        if (crl)
        {
            if (CertVerifyCRLRevocation(pSubject->dwCertEncodingType,
             pSubject->pCertInfo, 1, (PCRL_INFO *)&crl->pCrlInfo))
                *pdwFlags &= CERT_STORE_REVOCATION_FLAG;
        }
        else
            *pdwFlags |= CERT_STORE_NO_CRL_FLAG;
    }
    if (*pdwFlags & CERT_STORE_TIME_VALIDITY_FLAG)
    {
        if (0 == CertVerifyTimeValidity(NULL, pSubject->pCertInfo))
            *pdwFlags &= ~CERT_STORE_TIME_VALIDITY_FLAG;
    }
    if (*pdwFlags & CERT_STORE_SIGNATURE_FLAG)
    {
        if (CryptVerifyCertificateSignatureEx(0, pSubject->dwCertEncodingType,
         CRYPT_VERIFY_CERT_SIGN_SUBJECT_CERT, (void *)pSubject,
         CRYPT_VERIFY_CERT_SIGN_ISSUER_CERT, (void *)pIssuer, 0, NULL))
            *pdwFlags &= ~CERT_STORE_SIGNATURE_FLAG;
    }
    return TRUE;
}

PCCERT_CONTEXT WINAPI CertGetIssuerCertificateFromStore(HCERTSTORE hCertStore,
 PCCERT_CONTEXT pSubjectContext, PCCERT_CONTEXT pPrevIssuerContext,
 DWORD *pdwFlags)
{
    PCCERT_CONTEXT ret;

    TRACE("(%p, %p, %p, %08lx)\n", hCertStore, pSubjectContext,
     pPrevIssuerContext, *pdwFlags);

    if (!pSubjectContext)
    {
        SetLastError(E_INVALIDARG);
        return NULL;
    }

    ret = CertFindCertificateInStore(hCertStore,
     pSubjectContext->dwCertEncodingType, 0, CERT_FIND_ISSUER_OF,
     pSubjectContext, pPrevIssuerContext);
    if (ret)
    {
        if (!CertVerifySubjectCertificateContext(pSubjectContext, ret,
         pdwFlags))
        {
            CertFreeCertificateContext(ret);
            ret = NULL;
        }
    }

    return ret;
}

PCRYPT_ATTRIBUTE WINAPI CertFindAttribute(LPCSTR pszObjId, DWORD cAttr,
 CRYPT_ATTRIBUTE rgAttr[])
{
    PCRYPT_ATTRIBUTE ret = NULL;
    DWORD i;

    TRACE("%s %ld %p\n", debugstr_a(pszObjId), cAttr, rgAttr);

    if (!cAttr)
        return NULL;
    if (!pszObjId)
    {
        SetLastError(ERROR_INVALID_PARAMETER);
        return NULL;
    }

    for (i = 0; !ret && i < cAttr; i++)
        if (rgAttr[i].pszObjId && !strcmp(pszObjId, rgAttr[i].pszObjId))
            ret = &rgAttr[i];
    return ret;
}

PCERT_EXTENSION WINAPI CertFindExtension(LPCSTR pszObjId, DWORD cExtensions,
 CERT_EXTENSION rgExtensions[])
{
    PCERT_EXTENSION ret = NULL;
    DWORD i;

    TRACE("%s %ld %p\n", debugstr_a(pszObjId), cExtensions, rgExtensions);

    if (!cExtensions)
        return NULL;
    if (!pszObjId)
    {
        SetLastError(ERROR_INVALID_PARAMETER);
        return NULL;
    }

    for (i = 0; !ret && i < cExtensions; i++)
        if (rgExtensions[i].pszObjId && !strcmp(pszObjId,
         rgExtensions[i].pszObjId))
            ret = &rgExtensions[i];
    return ret;
}

PCERT_RDN_ATTR WINAPI CertFindRDNAttr(LPCSTR pszObjId, PCERT_NAME_INFO pName)
{
    PCERT_RDN_ATTR ret = NULL;
    DWORD i, j;

    TRACE("%s %p\n", debugstr_a(pszObjId), pName);

    if (!pszObjId)
    {
        SetLastError(ERROR_INVALID_PARAMETER);
        return NULL;
    }

    for (i = 0; !ret && i < pName->cRDN; i++)
        for (j = 0; !ret && j < pName->rgRDN[i].cRDNAttr; j++)
            if (pName->rgRDN[i].rgRDNAttr[j].pszObjId && !strcmp(pszObjId,
             pName->rgRDN[i].rgRDNAttr[j].pszObjId))
                ret = &pName->rgRDN[i].rgRDNAttr[j];
    return ret;
}

LONG WINAPI CertVerifyTimeValidity(LPFILETIME pTimeToVerify,
 PCERT_INFO pCertInfo)
{
    FILETIME fileTime;
    LONG ret;

    if (!pTimeToVerify)
    {
        SYSTEMTIME sysTime;

        GetSystemTime(&sysTime);
        SystemTimeToFileTime(&sysTime, &fileTime);
        pTimeToVerify = &fileTime;
    }
    if ((ret = CompareFileTime(pTimeToVerify, &pCertInfo->NotBefore)) >= 0)
    {
        ret = CompareFileTime(pTimeToVerify, &pCertInfo->NotAfter);
        if (ret < 0)
            ret = 0;
    }
    return ret;
}

BOOL WINAPI CryptHashCertificate(HCRYPTPROV hCryptProv, ALG_ID Algid,
 DWORD dwFlags, const BYTE *pbEncoded, DWORD cbEncoded, BYTE *pbComputedHash,
 DWORD *pcbComputedHash)
{
    BOOL ret = TRUE;
    HCRYPTHASH hHash = 0;

    TRACE("(%ld, %d, %08lx, %p, %ld, %p, %p)\n", hCryptProv, Algid, dwFlags,
     pbEncoded, cbEncoded, pbComputedHash, pcbComputedHash);

    if (!hCryptProv)
        hCryptProv = CRYPT_GetDefaultProvider();
    if (!Algid)
        Algid = CALG_SHA1;
    if (ret)
    {
        ret = CryptCreateHash(hCryptProv, Algid, 0, 0, &hHash);
        if (ret)
        {
            ret = CryptHashData(hHash, pbEncoded, cbEncoded, 0);
            if (ret)
                ret = CryptGetHashParam(hHash, HP_HASHVAL, pbComputedHash,
                 pcbComputedHash, 0);
            CryptDestroyHash(hHash);
        }
    }
    return ret;
}

BOOL WINAPI CryptSignCertificate(HCRYPTPROV hCryptProv, DWORD dwKeySpec,
 DWORD dwCertEncodingType, const BYTE *pbEncodedToBeSigned,
 DWORD cbEncodedToBeSigned, PCRYPT_ALGORITHM_IDENTIFIER pSignatureAlgorithm,
 const void *pvHashAuxInfo, BYTE *pbSignature, DWORD *pcbSignature)
{
    BOOL ret;
    ALG_ID algID;
    HCRYPTHASH hHash;

    TRACE("(%08lx, %ld, %ld, %p, %ld, %p, %p, %p, %p)\n", hCryptProv,
     dwKeySpec, dwCertEncodingType, pbEncodedToBeSigned, cbEncodedToBeSigned,
     pSignatureAlgorithm, pvHashAuxInfo, pbSignature, pcbSignature);

    algID = CertOIDToAlgId(pSignatureAlgorithm->pszObjId);
    if (!algID)
    {
        SetLastError(NTE_BAD_ALGID);
        return FALSE;
    }
    if (!hCryptProv)
    {
        SetLastError(ERROR_INVALID_PARAMETER);
        return FALSE;
    }

    ret = CryptCreateHash(hCryptProv, algID, 0, 0, &hHash);
    if (ret)
    {
        ret = CryptHashData(hHash, pbEncodedToBeSigned, cbEncodedToBeSigned, 0);
        if (ret)
            ret = CryptSignHashW(hHash, dwKeySpec, NULL, 0, pbSignature,
             pcbSignature);
        CryptDestroyHash(hHash);
    }
    return ret;
}

BOOL WINAPI CryptVerifyCertificateSignature(HCRYPTPROV hCryptProv,
 DWORD dwCertEncodingType, const BYTE *pbEncoded, DWORD cbEncoded,
 PCERT_PUBLIC_KEY_INFO pPublicKey)
{
    return CryptVerifyCertificateSignatureEx(hCryptProv, dwCertEncodingType,
     CRYPT_VERIFY_CERT_SIGN_SUBJECT_BLOB, (void *)pbEncoded,
     CRYPT_VERIFY_CERT_SIGN_ISSUER_PUBKEY, pPublicKey, 0, NULL);
}

static BOOL CRYPT_VerifyCertSignatureFromPublicKeyInfo(HCRYPTPROV hCryptProv,
 DWORD dwCertEncodingType, PCERT_PUBLIC_KEY_INFO pubKeyInfo,
 PCERT_SIGNED_CONTENT_INFO signedCert)
{
    BOOL ret;
    ALG_ID algID = CertOIDToAlgId(pubKeyInfo->Algorithm.pszObjId);
    HCRYPTKEY key;

    /* Load the default provider if necessary */
    if (!hCryptProv)
        hCryptProv = CRYPT_GetDefaultProvider();
    ret = CryptImportPublicKeyInfoEx(hCryptProv, dwCertEncodingType,
     pubKeyInfo, algID, 0, NULL, &key);
    if (ret)
    {
        HCRYPTHASH hash;

        /* Some key algorithms aren't hash algorithms, so map them */
        if (algID == CALG_RSA_SIGN || algID == CALG_RSA_KEYX)
            algID = CALG_SHA1;
        ret = CryptCreateHash(hCryptProv, algID, 0, 0, &hash);
        if (ret)
        {
            ret = CryptHashData(hash, signedCert->ToBeSigned.pbData,
             signedCert->ToBeSigned.cbData, 0);
            if (ret)
                ret = CryptVerifySignatureW(hash, signedCert->Signature.pbData,
                 signedCert->Signature.cbData, key, NULL, 0);
            CryptDestroyHash(hash);
        }
        CryptDestroyKey(key);
    }
    return ret;
}

BOOL WINAPI CryptVerifyCertificateSignatureEx(HCRYPTPROV hCryptProv,
 DWORD dwCertEncodingType, DWORD dwSubjectType, void *pvSubject,
 DWORD dwIssuerType, void *pvIssuer, DWORD dwFlags, void *pvReserved)
{
    BOOL ret = TRUE;
    CRYPT_DATA_BLOB subjectBlob;

    TRACE("(%08lx, %ld, %ld, %p, %ld, %p, %08lx, %p)\n", hCryptProv,
     dwCertEncodingType, dwSubjectType, pvSubject, dwIssuerType, pvIssuer,
     dwFlags, pvReserved);

    switch (dwSubjectType)
    {
    case CRYPT_VERIFY_CERT_SIGN_SUBJECT_BLOB:
    {
        PCRYPT_DATA_BLOB blob = (PCRYPT_DATA_BLOB)pvSubject;

        subjectBlob.pbData = blob->pbData;
        subjectBlob.cbData = blob->cbData;
        break;
    }
    case CRYPT_VERIFY_CERT_SIGN_SUBJECT_CERT:
    {
        PCERT_CONTEXT context = (PCERT_CONTEXT)pvSubject;

        subjectBlob.pbData = context->pbCertEncoded;
        subjectBlob.cbData = context->cbCertEncoded;
        break;
    }
    case CRYPT_VERIFY_CERT_SIGN_SUBJECT_CRL:
    {
        PCRL_CONTEXT context = (PCRL_CONTEXT)pvSubject;

        subjectBlob.pbData = context->pbCrlEncoded;
        subjectBlob.cbData = context->cbCrlEncoded;
        break;
    }
    default:
        SetLastError(E_INVALIDARG);
        ret = FALSE;
    }

    if (ret)
    {
        PCERT_SIGNED_CONTENT_INFO signedCert = NULL;
        DWORD size = 0;

        ret = CryptDecodeObjectEx(dwCertEncodingType, X509_CERT,
         subjectBlob.pbData, subjectBlob.cbData,
         CRYPT_DECODE_ALLOC_FLAG | CRYPT_DECODE_NOCOPY_FLAG, NULL,
         (BYTE *)&signedCert, &size);
        if (ret)
        {
            switch (dwIssuerType)
            {
            case CRYPT_VERIFY_CERT_SIGN_ISSUER_PUBKEY:
                ret = CRYPT_VerifyCertSignatureFromPublicKeyInfo(hCryptProv,
                 dwCertEncodingType, (PCERT_PUBLIC_KEY_INFO)pvIssuer,
                 signedCert);
                break;
            case CRYPT_VERIFY_CERT_SIGN_ISSUER_CERT:
                ret = CRYPT_VerifyCertSignatureFromPublicKeyInfo(hCryptProv,
                 dwCertEncodingType,
                 &((PCCERT_CONTEXT)pvIssuer)->pCertInfo->SubjectPublicKeyInfo,
                 signedCert);
                break;
            case CRYPT_VERIFY_CERT_SIGN_ISSUER_CHAIN:
                FIXME("CRYPT_VERIFY_CERT_SIGN_ISSUER_CHAIN: stub\n");
                ret = FALSE;
                break;
            case CRYPT_VERIFY_CERT_SIGN_ISSUER_NULL:
                if (pvIssuer)
                {
                    SetLastError(E_INVALIDARG);
                    ret = FALSE;
                }
                else
                {
                    FIXME("unimplemented for NULL signer\n");
                    SetLastError(E_INVALIDARG);
                    ret = FALSE;
                }
                break;
            default:
                SetLastError(E_INVALIDARG);
                ret = FALSE;
            }
            LocalFree(signedCert);
        }
    }
    return ret;
}

BOOL WINAPI CertGetEnhancedKeyUsage(PCCERT_CONTEXT pCertContext, DWORD dwFlags,
 PCERT_ENHKEY_USAGE pUsage, DWORD *pcbUsage)
{
    PCERT_ENHKEY_USAGE usage = NULL;
    DWORD bytesNeeded;
    BOOL ret = TRUE;

    if (!pCertContext || !pcbUsage)
    {
        SetLastError(ERROR_INVALID_PARAMETER);
        return FALSE;
    }

    TRACE("(%p, %08lx, %p, %ld)\n", pCertContext, dwFlags, pUsage, *pcbUsage);

    if (!(dwFlags & CERT_FIND_EXT_ONLY_ENHKEY_USAGE_FLAG))
    {
        DWORD propSize = 0;

        if (CertGetCertificateContextProperty(pCertContext,
         CERT_ENHKEY_USAGE_PROP_ID, NULL, &propSize))
        {
            LPBYTE buf = CryptMemAlloc(propSize);

            if (buf)
            {
                if (CertGetCertificateContextProperty(pCertContext,
                 CERT_ENHKEY_USAGE_PROP_ID, buf, &propSize))
                {
                    ret = CryptDecodeObjectEx(pCertContext->dwCertEncodingType,
                     X509_ENHANCED_KEY_USAGE, buf, propSize,
                     CRYPT_ENCODE_ALLOC_FLAG, NULL, &usage, &bytesNeeded);
                }
                CryptMemFree(buf);
            }
        }
    }
    if (!usage && !(dwFlags & CERT_FIND_PROP_ONLY_ENHKEY_USAGE_FLAG))
    {
        PCERT_EXTENSION ext = CertFindExtension(szOID_ENHANCED_KEY_USAGE,
         pCertContext->pCertInfo->cExtension,
         pCertContext->pCertInfo->rgExtension);

        if (ext)
        {
            ret = CryptDecodeObjectEx(pCertContext->dwCertEncodingType,
             X509_ENHANCED_KEY_USAGE, ext->Value.pbData, ext->Value.cbData,
             CRYPT_ENCODE_ALLOC_FLAG, NULL, &usage, &bytesNeeded);
        }
    }
    if (!usage)
    {
        /* If a particular location is specified, this should fail.  Otherwise
         * it should succeed with an empty usage.  (This is true on Win2k and
         * later, which we emulate.)
         */
        if (dwFlags)
        {
            SetLastError(CRYPT_E_NOT_FOUND);
            ret = FALSE;
        }
        else
            bytesNeeded = sizeof(CERT_ENHKEY_USAGE);
    }

    if (ret)
    {
        if (!pUsage)
            *pcbUsage = bytesNeeded;
        else if (*pcbUsage < bytesNeeded)
        {
            SetLastError(ERROR_MORE_DATA);
            *pcbUsage = bytesNeeded;
            ret = FALSE;
        }
        else
        {
            *pcbUsage = bytesNeeded;
            if (usage)
            {
                DWORD i;
                LPSTR nextOID = (LPSTR)((LPBYTE)pUsage +
                 sizeof(CERT_ENHKEY_USAGE) +
                 usage->cUsageIdentifier * sizeof(LPSTR));

                pUsage->cUsageIdentifier = usage->cUsageIdentifier;
                pUsage->rgpszUsageIdentifier = (LPSTR *)((LPBYTE)pUsage +
                 sizeof(CERT_ENHKEY_USAGE));
                for (i = 0; i < usage->cUsageIdentifier; i++)
                {
                    pUsage->rgpszUsageIdentifier[i] = nextOID;
                    strcpy(nextOID, usage->rgpszUsageIdentifier[i]);
                    nextOID += strlen(nextOID) + 1;
                }
            }
            else
                pUsage->cUsageIdentifier = 0;
        }
    }
    if (usage)
        LocalFree(usage);
    TRACE("returning %d\n", ret);
    return ret;
}

BOOL WINAPI CertSetEnhancedKeyUsage(PCCERT_CONTEXT pCertContext,
 PCERT_ENHKEY_USAGE pUsage)
{
    BOOL ret;

    TRACE("(%p, %p)\n", pCertContext, pUsage);

    if (pUsage)
    {
        CRYPT_DATA_BLOB blob = { 0, NULL };

        ret = CryptEncodeObjectEx(X509_ASN_ENCODING, X509_ENHANCED_KEY_USAGE,
         pUsage, CRYPT_ENCODE_ALLOC_FLAG, NULL, &blob.pbData, &blob.cbData);
        if (ret)
        {
            ret = CertSetCertificateContextProperty(pCertContext,
             CERT_ENHKEY_USAGE_PROP_ID, 0, &blob);
            LocalFree(blob.pbData);
        }
    }
    else
        ret = CertSetCertificateContextProperty(pCertContext,
         CERT_ENHKEY_USAGE_PROP_ID, 0, NULL);
    return ret;
}

BOOL WINAPI CertAddEnhancedKeyUsageIdentifier(PCCERT_CONTEXT pCertContext,
 LPCSTR pszUsageIdentifier)
{
    BOOL ret;
    DWORD size;

    TRACE("(%p, %s)\n", pCertContext, debugstr_a(pszUsageIdentifier));

    if (CertGetEnhancedKeyUsage(pCertContext,
     CERT_FIND_PROP_ONLY_ENHKEY_USAGE_FLAG, NULL, &size))
    {
        PCERT_ENHKEY_USAGE usage = CryptMemAlloc(size);

        if (usage)
        {
            ret = CertGetEnhancedKeyUsage(pCertContext,
             CERT_FIND_PROP_ONLY_ENHKEY_USAGE_FLAG, usage, &size);
            if (ret)
            {
                PCERT_ENHKEY_USAGE newUsage = CryptMemAlloc(size +
                 sizeof(LPSTR) + strlen(pszUsageIdentifier) + 1);

                if (newUsage)
                {
                    LPSTR nextOID;
                    DWORD i;

                    newUsage->rgpszUsageIdentifier =
                     (LPSTR *)((LPBYTE)newUsage + sizeof(CERT_ENHKEY_USAGE));
                    nextOID = (LPSTR)((LPBYTE)newUsage->rgpszUsageIdentifier +
                     (usage->cUsageIdentifier + 1) * sizeof(LPSTR));
                    for (i = 0; i < usage->cUsageIdentifier; i++)
                    {
                        newUsage->rgpszUsageIdentifier[i] = nextOID;
                        strcpy(nextOID, usage->rgpszUsageIdentifier[i]);
                        nextOID += strlen(nextOID) + 1;
                    }
                    newUsage->rgpszUsageIdentifier[i] = nextOID;
                    strcpy(nextOID, pszUsageIdentifier);
                    newUsage->cUsageIdentifier = i + 1;
                    ret = CertSetEnhancedKeyUsage(pCertContext, newUsage);
                    CryptMemFree(newUsage);
                }
            }
            CryptMemFree(usage);
        }
        else
            ret = FALSE;
    }
    else
    {
        PCERT_ENHKEY_USAGE usage = CryptMemAlloc(sizeof(CERT_ENHKEY_USAGE) +
         sizeof(LPSTR) + strlen(pszUsageIdentifier) + 1);

        if (usage)
        {
            usage->rgpszUsageIdentifier =
             (LPSTR *)((LPBYTE)usage + sizeof(CERT_ENHKEY_USAGE));
            usage->rgpszUsageIdentifier[0] = (LPSTR)((LPBYTE)usage +
             sizeof(CERT_ENHKEY_USAGE) + sizeof(LPSTR));
            strcpy(usage->rgpszUsageIdentifier[0], pszUsageIdentifier);
            usage->cUsageIdentifier = 1;
            ret = CertSetEnhancedKeyUsage(pCertContext, usage);
            CryptMemFree(usage);
        }
        else
            ret = FALSE;
    }
    return ret;
}

BOOL WINAPI CertRemoveEnhancedKeyUsageIdentifier(PCCERT_CONTEXT pCertContext,
 LPCSTR pszUsageIdentifier)
{
    BOOL ret;
    DWORD size;
    CERT_ENHKEY_USAGE usage;

    TRACE("(%p, %s)\n", pCertContext, debugstr_a(pszUsageIdentifier));

    size = sizeof(usage);
    ret = CertGetEnhancedKeyUsage(pCertContext,
     CERT_FIND_PROP_ONLY_ENHKEY_USAGE_FLAG, &usage, &size);
    if (!ret && GetLastError() == ERROR_MORE_DATA)
    {
        PCERT_ENHKEY_USAGE pUsage = CryptMemAlloc(size);

        if (pUsage)
        {
            ret = CertGetEnhancedKeyUsage(pCertContext,
             CERT_FIND_PROP_ONLY_ENHKEY_USAGE_FLAG, pUsage, &size);
            if (ret)
            {
                if (pUsage->cUsageIdentifier)
                {
                    DWORD i;
                    BOOL found = FALSE;

                    for (i = 0; i < pUsage->cUsageIdentifier; i++)
                    {
                        if (!strcmp(pUsage->rgpszUsageIdentifier[i],
                         pszUsageIdentifier))
                            found = TRUE;
                        if (found && i < pUsage->cUsageIdentifier - 1)
                            pUsage->rgpszUsageIdentifier[i] =
                             pUsage->rgpszUsageIdentifier[i + 1];
                    }
                    pUsage->cUsageIdentifier--;
                    /* Remove the usage if it's empty */
                    if (pUsage->cUsageIdentifier)
                        ret = CertSetEnhancedKeyUsage(pCertContext, pUsage);
                    else
                        ret = CertSetEnhancedKeyUsage(pCertContext, NULL);
                }
            }
            CryptMemFree(pUsage);
        }
        else
            ret = FALSE;
    }
    else
    {
        /* it fit in an empty usage, therefore there's nothing to remove */
        ret = TRUE;
    }
    return ret;
}

BOOL WINAPI CertGetValidUsages(DWORD cCerts, PCCERT_CONTEXT *rghCerts,
 int *cNumOIDSs, LPSTR *rghOIDs, DWORD *pcbOIDs)
{
    BOOL ret = TRUE;
    DWORD i, cbOIDs = 0;
    BOOL allUsagesValid = TRUE;
    CERT_ENHKEY_USAGE validUsages = { 0, NULL };

    TRACE("(%ld, %p, %p, %p, %ld)\n", cCerts, *rghCerts, cNumOIDSs,
     rghOIDs, *pcbOIDs);

    for (i = 0; ret && i < cCerts; i++)
    {
        CERT_ENHKEY_USAGE usage;
        DWORD size = sizeof(usage);

        ret = CertGetEnhancedKeyUsage(rghCerts[i], 0, &usage, &size);
        /* Success is deliberately ignored: it implies all usages are valid */
        if (!ret && GetLastError() == ERROR_MORE_DATA)
        {
            PCERT_ENHKEY_USAGE pUsage = CryptMemAlloc(size);

            allUsagesValid = FALSE;
            if (pUsage)
            {
                ret = CertGetEnhancedKeyUsage(rghCerts[i], 0, pUsage, &size);
                if (ret)
                {
                    if (!validUsages.cUsageIdentifier)
                    {
                        DWORD j;

                        cbOIDs = pUsage->cUsageIdentifier * sizeof(LPSTR);
                        validUsages.cUsageIdentifier = pUsage->cUsageIdentifier;
                        for (j = 0; j < validUsages.cUsageIdentifier; j++)
                            cbOIDs += lstrlenA(pUsage->rgpszUsageIdentifier[j])
                             + 1;
                        validUsages.rgpszUsageIdentifier =
                         CryptMemAlloc(cbOIDs);
                        if (validUsages.rgpszUsageIdentifier)
                        {
                            LPSTR nextOID = (LPSTR)
                             ((LPBYTE)validUsages.rgpszUsageIdentifier +
                             validUsages.cUsageIdentifier * sizeof(LPSTR));

                            for (j = 0; j < validUsages.cUsageIdentifier; j++)
                            {
                                validUsages.rgpszUsageIdentifier[j] = nextOID;
                                lstrcpyA(validUsages.rgpszUsageIdentifier[j],
                                 pUsage->rgpszUsageIdentifier[j]);
                                nextOID += lstrlenA(nextOID) + 1;
                            }
                        }
                        else
                            ret = FALSE;
                    }
                    else
                    {
                        DWORD j, k, validIndexes = 0, numRemoved = 0;

                        /* Merge: build a bitmap of all the indexes of
                         * validUsages.rgpszUsageIdentifier that are in pUsage.
                         */
                        for (j = 0; j < pUsage->cUsageIdentifier; j++)
                        {
                            for (k = 0; k < validUsages.cUsageIdentifier; k++)
                            {
                                if (!strcmp(pUsage->rgpszUsageIdentifier[j],
                                 validUsages.rgpszUsageIdentifier[k]))
                                {
                                    validIndexes |= (1 << k);
                                    break;
                                }
                            }
                        }
                        /* Merge by removing from validUsages those that are
                         * not in the bitmap.
                         */
                        for (j = 0; j < validUsages.cUsageIdentifier; j++)
                        {
                            if (!(validIndexes & (1 << j)))
                            {
                                if (j < validUsages.cUsageIdentifier - 1)
                                {
                                    memcpy(&validUsages.rgpszUsageIdentifier[j],
                                     &validUsages.rgpszUsageIdentifier[j +
                                     numRemoved + 1],
                                     (validUsages.cUsageIdentifier - numRemoved
                                     - j - 1) * sizeof(LPSTR));
                                    cbOIDs -= lstrlenA(
                                     validUsages.rgpszUsageIdentifier[j]) + 1 +
                                     sizeof(LPSTR);
                                    numRemoved++;
                                }
                                else
                                    validUsages.cUsageIdentifier--;
                            }
                        }
                    }
                }
                CryptMemFree(pUsage);
            }
            else
                ret = FALSE;
        }
    }
    if (ret)
    {
        if (allUsagesValid)
        {
            *cNumOIDSs = -1;
            *pcbOIDs = 0;
        }
        else
        {
            if (!rghOIDs || *pcbOIDs < cbOIDs)
            {
                *pcbOIDs = cbOIDs;
                SetLastError(ERROR_MORE_DATA);
                ret = FALSE;
            }
            else
            {
                LPSTR nextOID = (LPSTR)((LPBYTE)rghOIDs +
                 validUsages.cUsageIdentifier * sizeof(LPSTR));

                *pcbOIDs = cbOIDs;
                *cNumOIDSs = validUsages.cUsageIdentifier;
                for (i = 0; i < validUsages.cUsageIdentifier; i++)
                {
                    rghOIDs[i] = nextOID;
                    lstrcpyA(nextOID, validUsages.rgpszUsageIdentifier[i]);
                    nextOID += lstrlenA(nextOID) + 1;
                }
            }
        }
    }
    CryptMemFree(validUsages.rgpszUsageIdentifier);
    return ret;
}

/* Sets the CERT_KEY_PROV_INFO_PROP_ID property of context from pInfo, or, if
 * pInfo is NULL, from the attributes of hProv.
 */
static void CertContext_SetKeyProvInfo(PCCERT_CONTEXT context,
 PCRYPT_KEY_PROV_INFO pInfo, HCRYPTPROV hProv)
{
    CRYPT_KEY_PROV_INFO info = { 0 };
    BOOL ret;

    if (!pInfo)
    {
        DWORD size;
        int len;

        ret = CryptGetProvParam(hProv, PP_CONTAINER, NULL, &size, 0);
        if (ret)
        {
            LPSTR szContainer = CryptMemAlloc(size);

            if (szContainer)
            {
                ret = CryptGetProvParam(hProv, PP_CONTAINER,
                 (BYTE *)szContainer, &size, 0);
                if (ret)
                {
                    len = MultiByteToWideChar(CP_ACP, 0, szContainer, -1,
                     NULL, 0);
                    if (len)
                    {
                        info.pwszContainerName = CryptMemAlloc(len *
                         sizeof(WCHAR));
                        len = MultiByteToWideChar(CP_ACP, 0, szContainer, -1,
                         info.pwszContainerName, len);
                    }
                }
                CryptMemFree(szContainer);
            }
        }
        ret = CryptGetProvParam(hProv, PP_NAME, NULL, &size, 0);
        if (ret)
        {
            LPSTR szProvider = CryptMemAlloc(size);

            if (szProvider)
            {
                ret = CryptGetProvParam(hProv, PP_NAME, (BYTE *)szProvider,
                 &size, 0);
                if (ret)
                {
                    len = MultiByteToWideChar(CP_ACP, 0, szProvider, -1,
                     NULL, 0);
                    if (len)
                    {
                        info.pwszProvName = CryptMemAlloc(len *
                         sizeof(WCHAR));
                        len = MultiByteToWideChar(CP_ACP, 0, szProvider, -1,
                         info.pwszProvName, len);
                    }
                }
                CryptMemFree(szProvider);
            }
        }
        size = sizeof(info.dwKeySpec);
        ret = CryptGetProvParam(hProv, PP_KEYSPEC, (LPBYTE)&info.dwKeySpec,
         &size, 0);
        if (!ret)
            info.dwKeySpec = AT_SIGNATURE;
        size = sizeof(info.dwProvType);
        ret = CryptGetProvParam(hProv, PP_PROVTYPE, (LPBYTE)&info.dwProvType,
         &size, 0);
        if (!ret)
            info.dwProvType = PROV_RSA_FULL;
        pInfo = &info;
    }

    ret = CertSetCertificateContextProperty(context, CERT_KEY_PROV_INFO_PROP_ID,
     0, pInfo);

    if (pInfo == &info)
    {
        CryptMemFree(info.pwszContainerName);
        CryptMemFree(info.pwszProvName);
    }
}

/* Creates a signed certificate context from the unsigned, encoded certificate
 * in blob, using the crypto provider hProv and the signature algorithm sigAlgo.
 */
static PCCERT_CONTEXT CRYPT_CreateSignedCert(PCRYPT_DER_BLOB blob,
 HCRYPTPROV hProv, PCRYPT_ALGORITHM_IDENTIFIER sigAlgo)
{
    PCCERT_CONTEXT context = NULL;
    BOOL ret;
    DWORD sigSize = 0;

    ret = CryptSignCertificate(hProv, AT_SIGNATURE, X509_ASN_ENCODING,
     blob->pbData, blob->cbData, sigAlgo, NULL, NULL, &sigSize);
    if (ret)
    {
        LPBYTE sig = CryptMemAlloc(sigSize);

        ret = CryptSignCertificate(hProv, AT_SIGNATURE, X509_ASN_ENCODING,
         blob->pbData, blob->cbData, sigAlgo, NULL, sig, &sigSize);
        if (ret)
        {
            CERT_SIGNED_CONTENT_INFO signedInfo;
            BYTE *encodedSignedCert = NULL;
            DWORD encodedSignedCertSize = 0;

            signedInfo.ToBeSigned.cbData = blob->cbData;
            signedInfo.ToBeSigned.pbData = blob->pbData;
            memcpy(&signedInfo.SignatureAlgorithm, sigAlgo,
             sizeof(signedInfo.SignatureAlgorithm));
            signedInfo.Signature.cbData = sigSize;
            signedInfo.Signature.pbData = sig;
            signedInfo.Signature.cUnusedBits = 0;
            ret = CryptEncodeObjectEx(X509_ASN_ENCODING, X509_CERT,
             &signedInfo, CRYPT_ENCODE_ALLOC_FLAG, NULL,
             (BYTE *)&encodedSignedCert, &encodedSignedCertSize);
            if (ret)
            {
                context = CertCreateCertificateContext(X509_ASN_ENCODING,
                 encodedSignedCert, encodedSignedCertSize);
                LocalFree(encodedSignedCert);
            }
        }
        CryptMemFree(sig);
    }
    return context;
}

/* Copies data from the parameters into info, where:
 * pSerialNumber: The serial number.  Must not be NULL.
 * pSubjectIssuerBlob: Specifies both the subject and issuer for info.
 *                     Must not be NULL
 * pSignatureAlgorithm: Optional.
 * pStartTime: The starting time of the certificate.  If NULL, the current
 *             system time is used.
 * pEndTime: The ending time of the certificate.  If NULL, one year past the
 *           starting time is used.
 * pubKey: The public key of the certificate.  Must not be NULL.
 * pExtensions: Extensions to be included with the certificate.  Optional.
 */
static void CRYPT_MakeCertInfo(PCERT_INFO info, PCRYPT_DATA_BLOB pSerialNumber,
 PCERT_NAME_BLOB pSubjectIssuerBlob,
 PCRYPT_ALGORITHM_IDENTIFIER pSignatureAlgorithm, PSYSTEMTIME pStartTime,
 PSYSTEMTIME pEndTime, PCERT_PUBLIC_KEY_INFO pubKey,
 PCERT_EXTENSIONS pExtensions)
{
    static CHAR oid[] = szOID_RSA_SHA1RSA;

    assert(info);
    assert(pSerialNumber);
    assert(pSubjectIssuerBlob);
    assert(pubKey);

    info->dwVersion = CERT_V3;
    info->SerialNumber.cbData = pSerialNumber->cbData;
    info->SerialNumber.pbData = pSerialNumber->pbData;
    if (pSignatureAlgorithm)
        memcpy(&info->SignatureAlgorithm, pSignatureAlgorithm,
         sizeof(info->SignatureAlgorithm));
    else
    {
        info->SignatureAlgorithm.pszObjId = oid;
        info->SignatureAlgorithm.Parameters.cbData = 0;
        info->SignatureAlgorithm.Parameters.pbData = NULL;
    }
    info->Issuer.cbData = pSubjectIssuerBlob->cbData;
    info->Issuer.pbData = pSubjectIssuerBlob->pbData;
    if (pStartTime)
        SystemTimeToFileTime(pStartTime, &info->NotBefore);
    else
        GetSystemTimeAsFileTime(&info->NotBefore);
    if (pEndTime)
        SystemTimeToFileTime(pEndTime, &info->NotAfter);
    else
    {
        SYSTEMTIME endTime;

        if (FileTimeToSystemTime(&info->NotBefore, &endTime))
        {
            endTime.wYear++;
            SystemTimeToFileTime(&endTime, &info->NotAfter);
        }
    }
    info->Subject.cbData = pSubjectIssuerBlob->cbData;
    info->Subject.pbData = pSubjectIssuerBlob->pbData;
    memcpy(&info->SubjectPublicKeyInfo, pubKey,
     sizeof(info->SubjectPublicKeyInfo));
    if (pExtensions)
    {
        info->cExtension = pExtensions->cExtension;
        info->rgExtension = pExtensions->rgExtension;
    }
    else
    {
        info->cExtension = 0;
        info->rgExtension = NULL;
    }
}
 
typedef RPC_STATUS (RPC_ENTRY *UuidCreateFunc)(UUID *);
typedef RPC_STATUS (RPC_ENTRY *UuidToStringFunc)(UUID *, unsigned char **);
typedef RPC_STATUS (RPC_ENTRY *RpcStringFreeFunc)(unsigned char **);

static HCRYPTPROV CRYPT_CreateKeyProv(void)
{
    HCRYPTPROV hProv = 0;
    HMODULE rpcrt = LoadLibraryA("rpcrt4");

    if (rpcrt)
    {
        UuidCreateFunc uuidCreate = (UuidCreateFunc)GetProcAddress(rpcrt,
         "UuidCreate");
        UuidToStringFunc uuidToString = (UuidToStringFunc)GetProcAddress(rpcrt,
         "UuidToStringA");
        RpcStringFreeFunc rpcStringFree = (RpcStringFreeFunc)GetProcAddress(
         rpcrt, "RpcStringFreeA");

        if (uuidCreate && uuidToString && rpcStringFree)
        {
            UUID uuid;
            RPC_STATUS status = uuidCreate(&uuid);

            if (status == RPC_S_OK || status == RPC_S_UUID_LOCAL_ONLY)
            {
                unsigned char *uuidStr;

                status = uuidToString(&uuid, &uuidStr);
                if (status == RPC_S_OK)
                {
                    BOOL ret = CryptAcquireContextA(&hProv, (LPCSTR)uuidStr,
                     MS_DEF_PROV_A, PROV_RSA_FULL, CRYPT_NEWKEYSET);

                    if (ret)
                    {
                        HCRYPTKEY key;

                        ret = CryptGenKey(hProv, AT_SIGNATURE, 0, &key);
                        if (ret)
                            CryptDestroyKey(key);
                    }
                    rpcStringFree(&uuidStr);
                }
            }
        }
        FreeLibrary(rpcrt);
    }
    return hProv;
}

PCCERT_CONTEXT WINAPI CertCreateSelfSignCertificate(HCRYPTPROV hProv,
 PCERT_NAME_BLOB pSubjectIssuerBlob, DWORD dwFlags,
 PCRYPT_KEY_PROV_INFO pKeyProvInfo,
 PCRYPT_ALGORITHM_IDENTIFIER pSignatureAlgorithm, PSYSTEMTIME pStartTime,
 PSYSTEMTIME pEndTime, PCERT_EXTENSIONS pExtensions)
{
    PCCERT_CONTEXT context = NULL;
    BOOL ret, releaseContext = FALSE;
    PCERT_PUBLIC_KEY_INFO pubKey = NULL;
    DWORD pubKeySize = 0;

    TRACE("(0x%08lx, %p, %08lx, %p, %p, %p, %p, %p)\n", hProv,
     pSubjectIssuerBlob, dwFlags, pKeyProvInfo, pSignatureAlgorithm, pStartTime,
     pExtensions, pExtensions);

    if (!hProv)
    {
        hProv = CRYPT_CreateKeyProv();
        releaseContext = TRUE;
    }

    CryptExportPublicKeyInfo(hProv, AT_SIGNATURE, X509_ASN_ENCODING, NULL,
     &pubKeySize);
    pubKey = CryptMemAlloc(pubKeySize);
    if (pubKey)
    {
        ret = CryptExportPublicKeyInfo(hProv, AT_SIGNATURE, X509_ASN_ENCODING,
         pubKey, &pubKeySize);
        if (ret)
        {
            CERT_INFO info = { 0 };
            CRYPT_DER_BLOB blob = { 0, NULL };
            BYTE serial[16];
            CRYPT_DATA_BLOB serialBlob = { sizeof(serial), serial };

            CryptGenRandom(hProv, sizeof(serial), serial);
            CRYPT_MakeCertInfo(&info, &serialBlob, pSubjectIssuerBlob,
             pSignatureAlgorithm, pStartTime, pEndTime, pubKey, pExtensions);
            ret = CryptEncodeObjectEx(X509_ASN_ENCODING, X509_CERT_TO_BE_SIGNED,
             &info, CRYPT_ENCODE_ALLOC_FLAG, NULL, (BYTE *)&blob.pbData,
             &blob.cbData);
            if (ret)
            {
                if (!(dwFlags & CERT_CREATE_SELFSIGN_NO_SIGN))
                    context = CRYPT_CreateSignedCert(&blob, hProv,
                     &info.SignatureAlgorithm);
                else
                    context = CertCreateCertificateContext(X509_ASN_ENCODING,
                     blob.pbData, blob.cbData);
                if (context && !(dwFlags & CERT_CREATE_SELFSIGN_NO_KEY_INFO))
                    CertContext_SetKeyProvInfo(context, pKeyProvInfo, hProv);
                LocalFree(blob.pbData);
            }
        }
        CryptMemFree(pubKey);
    }
    if (releaseContext)
        CryptReleaseContext(hProv, 0);
    return context;
}