windows: replace uintptr in crypto structs

This CL is a copy of CL 106275 (see CL 106275 for details).

It introduces CertInfo, CertTrustListInfo and CertRevocationCrlInfo
types. It uses pointers to new types instead of uintptr in CertContext,
CertSimpleChain and CertRevocationInfo.

CertRevocationInfo, CertChainPolicyPara and CertChainPolicyStatus types
have uintptr field that can be pointer to many different things
(according to Windows API). So this CL introduces Pointer type to be
used for those cases.

Fixes golang/go#25797

Change-Id: I7797ddc6daf3e67b7eab69ab9fbf4d51650f8b6a
Reviewed-on: https://go-review.googlesource.com/118797
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Alex Brainman <alex.brainman@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>

windows/types_windows.go

@@ -312,6 +312,14 @@ var (
 	OID_SGC_NETSCAPE        = []byte("2.16.840.1.113730.4.1\x00")
 )
 
+// Pointer represents a pointer to an arbitrary Windows type.
+//
+// Pointer-typed fields may point to one of many different types. It's
+// up to the caller to provide a pointer to the appropriate type, cast
+// to Pointer. The caller must obey the unsafe.Pointer rules while
+// doing so.
+type Pointer *struct{}
+
 // Invented values to support what package os expects.
 type Timeval struct {
 	Sec  int32
@@ -880,11 +888,15 @@ type MibIfRow struct {
 	Descr           [MAXLEN_IFDESCR]byte
 }
 
+type CertInfo struct {
+	// Not implemented
+}
+
 type CertContext struct {
 	EncodingType uint32
 	EncodedCert  *byte
 	Length       uint32
-	CertInfo     uintptr
+	CertInfo     *CertInfo
 	Store        Handle
 }
 
@@ -899,12 +911,16 @@ type CertChainContext struct {
 	RevocationFreshnessTime    uint32
 }
 
+type CertTrustListInfo struct {
+	// Not implemented
+}
+
 type CertSimpleChain struct {
 	Size                       uint32
 	TrustStatus                CertTrustStatus
 	NumElements                uint32
 	Elements                   **CertChainElement
-	TrustListInfo              uintptr
+	TrustListInfo              *CertTrustListInfo
 	HasRevocationFreshnessTime uint32
 	RevocationFreshnessTime    uint32
 }
@@ -919,14 +935,18 @@ type CertChainElement struct {
 	ExtendedErrorInfo *uint16
 }
 
+type CertRevocationCrlInfo struct {
+	// Not implemented
+}
+
 type CertRevocationInfo struct {
 	Size             uint32
 	RevocationResult uint32
 	RevocationOid    *byte
-	OidSpecificInfo  uintptr
+	OidSpecificInfo  Pointer
 	HasFreshnessTime uint32
 	FreshnessTime    uint32
-	CrlInfo          uintptr // *CertRevocationCrlInfo
+	CrlInfo          *CertRevocationCrlInfo
 }
 
 type CertTrustStatus struct {
@@ -957,7 +977,7 @@ type CertChainPara struct {
 type CertChainPolicyPara struct {
 	Size            uint32
 	Flags           uint32
-	ExtraPolicyPara uintptr
+	ExtraPolicyPara Pointer
 }
 
 type SSLExtraCertChainPolicyPara struct {
@@ -972,7 +992,7 @@ type CertChainPolicyStatus struct {
 	Error             uint32
 	ChainIndex        uint32
 	ElementIndex      uint32
-	ExtraPolicyStatus uintptr
+	ExtraPolicyStatus Pointer
 }
 
 const (