CERT_CHAIN_ENGINE_CONFIG

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Windows Embedded CE 6.0 R3

4/8/2010

This structure sets parameters for building a non-default certificate chain engine. The engine determines the ways that certificate chains are built.

Syntax

typedef struct _CERT_CHAIN_ENGINE_CONFIG {
  DWORD cbSize;
  HCERTSTORE hRestrictedRoot;
  HCERTSTORE hRestrictedTrust;
  HCERTSTORE hRestrictedOther;
  DWORD cAdditionalStore;
  HCERTSTORE* rghAdditionalStore;
  DWORD dwFlags;
  DWORD dwUrlRetrievalTimeout;
  DWORD MaximumCachedCertificates;
  DWORD CycleDetectionModulus;
} CERT_CHAIN_ENGINE_CONFIG, *PCERT_CHAIN_ENGINE_CONFIG;

Members

• cbSize
  Size of this structure in bytes.

• hRestrictedRoot
  This parameter can be used to restrict the root store. If used, it can be the handle of any HCERTSTORE containing only a proper subset of the certificates in the root store.

• hRestrictedTrust
  Store handle. If used, restricts the stores searched to find certificate trust lists (CTLs).

• hRestrictedOther
  Store handle. If used, restricts the stores searched for certificates.

• cAdditionalStore
  Count of additional stores to be searched for certificates needed to build chains.

• rghAdditionalStore
  Pointer to an array of store handles for any additional stores to be searched in building chains.

• dwFlags
  The following table shows the flags defined for this member.

  Value	Description
  CERT_CHAIN_CACHE_END_CERT	Information in the end certificate is cached. By default, information in all certificates except the end certificate is cached as a chain is built. Setting this flag extends the caching to the end certificate.
  CERT_CHAIN_CACHE_ONLY_URL_RETRIEVAL	Uses only cached URLs in building a certificate chain. The Internet and intranet are not searched for URL-based objects.
  CERT_CHAIN_USE_LOCAL_MACHINE_STORE	Builds the chain using the LocalMachine registry location as opposed to the CurrentUser location.

• dwUrlRetrievalTimeout
  Number of microseconds before a time-out for network-based URL object retrievals. Can be set to zero to use the default limit.

• MaximumCachedCertificates
  Limit on the number of certificates that can be cached as a chain is built. Can be set to zero to use the default limit.

• CycleDetectionModulus
  Number of certificates added to the chain before a check is made to determine if there is a cycle of certificates in the chain. A cycle may be defined as having the same certificate in two different places in a chain.

  The lower the number, the more frequently checks will be made. Extra checking for cycles of certificates will slow the process considerably. This parameter can be set to zero to use the default limit.

Remarks

The chain-building engine uses four certificate stores in building chains. These are hRoot, hWorld, hTrust, and hOther. The handles of these stores are established using information in this structure when a chain engine is created.

hRoot is the store handle from hRestrictedRoot or, if hRestrictedRoot is NULL, the handle for System Store Root.

hWorld is a collection certificate store including sibling stores hRoot, CA, My, Trust, and any additional stores whose handles are in the array pointed to by rghAdditionalStore.

hTrust is the store handle from hRestrictedTrust or, if hRestrictedTrust is NULL, the store handle is hWorld.

hOther is hRestrictedOther plus hRoot or, if hRestrictedTrust is non-NULL, the hWorld collection store plus the store handle from hRestrictedTrust.

Requirements